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Class 9 Science Case Study Questions Chapter 1 Matter in our Surroundings

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Case study Questions in Class 9 Science Chapter 1 are very important to solve for your exam. Class 9 Science Chapter 1 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving Class 9 Science Case Study Questions  Chapter 1 Matter in our Surroundings

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In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Matter in our Surroundings Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science  Chapter 1 Matter in our Surroundings

Case Study/Passage-Based Questions

Case Study 1: There are three states of matter – solid, liquid, and gas.

Solids  have a definite shape, distinct boundaries, and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Liquids  have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas  has an indefinite shape and no fixed volume. Gas gets the shape and volume of the container.Gas has a very low density and hence is light. Gas can flow easily and hence is called fluid.

i.) Which of the following state of matter takes the shape of the container in which it is filled?

d.) Both b and c

Answer: d.) Both b and c

ii.) Distance between particles of matter least in

d.) None of these

Answer: a.) Solid

iii.) Compressibility is least in case of

Case Study 2: Matter is anything that occupies space and has mass. It exists in various forms, such as solid, liquid, and gas. The physical properties of matter, such as shape, size, and state, can be observed and measured. The particles that makeup matter are constantly in motion, and their motion determines the state of matter. In a solid, the particles are tightly packed and have a fixed shape and volume. In a liquid, the particles are close together but can move past each other, giving the substance a fixed volume but no fixed shape. In a gas, the particles are far apart and move freely, allowing the substance to occupy any volume and shape. Matter can undergo changes in its state through the processes of evaporation, condensation, melting, and freezing. Understanding the properties and behavior of matter is essential for studying various scientific phenomena and practical applications in our daily lives.

What is matter? a) Anything that occupies space and has mass b) Anything that is visible to the naked eye c) Anything that is in a solid state d) Anything that is in a gaseous state Answer: a) Anything that occupies space and has mass

What determines the state of matter? a) Physical properties b) Chemical properties c) The motion of particles d) The color of the substance Answer: c) The motion of particles

How are particles arranged in a solid? a) Far apart and move freely b) Close together but can move past each other c) Tightly packed and have a fixed shape d) Tightly packed but have no fixed shape Answer: c) Tightly packed and have a fixed shape

What is the behavior of particles in a gas? a) They are far apart and move freely b) They are close together but can move past each other c) They are tightly packed and have a fixed shape d) They are tightly packed but have no fixed shape Answer: a) They are far apart and move freely

What processes can matter undergo to change its state? a) Evaporation, condensation, melting, and freezing b) Dissolution, combustion, sublimation, and oxidation c) Fermentation, photosynthesis, respiration, and digestion d) Oxidation, reduction, precipitation, and ionization Answer: a) Evaporation, condensation, melting, and freezing

Hope the information shed above regarding Case Study and Passage Based Questions for Class 9 Science Chapter 1 Matter in our Surroundings with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 9 Science Matter in our Surroundings Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible By Team Study Rate

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Case Study Questions Class 9 Science Matter in our Surroundings

Case study questions class 9 science chapter 1 matter in our surroundings.

CBSE Class 9 Case Study Questions Science Matter in our Surroundings. Important Case Study Questions for Class 9 Exam. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Matter in our Surroundings.

At Case Study Questions there will given a Paragraph. In where some Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks or 4 marks.

CBSE Case Study Questions Class 9 Science – Matter in our Surroundings

Case study 1:.

1.) A matter is anything that has mass and occupies space. Pen, paper, clips, sand, air, ice, etc. are different forms of matter. Every matter is made up of small particles. These particles are so tiny that they can’t be seen with naked eyes. Let’s see about the different characteristics of particles of matter.

  • All matter is made up of very small particles.
  • .Particles of matter has spaces between them.
  • Particles of matter are continuously moving.
  • Particles of matter attract each other.

Answer the following questions by referring above paragraph.

i.) Which of following is not matter?

c.) smell of perfume

d.) None of these

ii.) Thoughts coming in our mind are example of matter. True or false

c.) None of these

iii.) Which of the following is true about particles of matter?

a.) Particles of matter has spaces between them

b.) Particles of matter are continuously moving

c.) Particles of matter attract each other

d.) All of these

iv.) Give 5 examples of matter in our surroundings

v.) Enlist all properties of particles of matter

Answer key-1

iv.) pen, pencil, notebook, ice and water

v.) Different characteristics of particles of matter are

Case Study 2:

2.) There are three states of matter – solid, liquid and gas.

Solids have a definite shape, distinct boundaries and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Liquids have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas as has indefinite shape, no fixed volume. Gas gets the shape and volume of container.

Gas has very low density hence are light. Gas can flow easily and hence are called fluid.

i.) Which of the following state of matter takes shape of container in which it is filled?

d.) Both b and c

ii.) Distance between particles of matter least in

iii.) Compressibility is least in case of

iv.) Give properties of solids.

v.) Give properties of Gases.

Answer key-2

iv.) properties of solid are given below

  • Solid has fixed volume.
  • Solid has fixed shape.
  • Solid has high density.
  • Solids are heavy.
  • Solid does not flow.

v.) Properties of gases are

  • Gas has indefinite shape
  • Gas has no fixed volume.
  • Gas gets the shape and volume of container.
  • Gas fills the container completely.
  • Gas has very low density.
  • Because of low density gas are light.
  • Gas can flow easily and hence are called fluid.

Case Study 3:

3.) What happens inside the matter during change of state? On increasing the temperature of solids, the kinetic energy of the particles increases. Due to the increase in kinetic energy, the

Particles start vibrating with greater speed. The energy supplied by heat overcomes the forces of attraction between the particles. The particles leave their fixed positions and start moving more freely. A stage is reached when the solid melts and is converted to a liquid. The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

The temperature of the system does not change after the melting point is reached, till all the ice melts. This happens even though we continue to heat the beaker, that is, we continue to supply heat. This heat gets used up in changing the state by overcoming the forces of attraction between the particles. The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion. So, particles in water at 0 0 C (273 K) have more energy as compared to particles in ice at the same temperature.

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point. Boiling is a bulk phenomenon. Particles from the bulk of the liquid gain enough energy to change into the vapour state. A change of state directly from solid to gas without changing into liquid state is called sublimation and the direct change of gas to solid without changing into liquid is called deposition.

i.) A change of state directly from solid to gas without changing into liquid state is called

a.) Sublimation

b.) Deposition

c.) Boiling point

ii.) The direct change of gas to solid without changing into liquid is called

iii.) The energy supplied by heat to solid is used to overcome the forces of attraction between the particles. True or false

iv.) Define melting point and boiling point

v.) Define latent heat of fusion

Answer key-3

iv.) The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

v.) The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.

Case Study 4:

4 .) Do we always need to heat or change pressure for changing the state of matter? Can you quote some examples from everyday life where change of state from liquid to vapour takes place without the liquid reaching the boiling point? In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

i.) Evaporation of liquid takes place at

a.) Boiling point

b.) Above boiling point

c.) Below boiling point

ii.) Evaporation takes place at surface of liquid because

a.) They are heavy as compare to other particles

b.) They have sufficient kinetic energy to break the force

c.) They are light weight as compare to other particles

iii.) During evaporation particles of liquid change into vapour

a.) From the surface

b.) From the bottom

c.) From all over the liquid

iv.) Define evaporation.

v.) Explain process of evaporation

Answer key-4

iv.) The phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

v.) In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

Case Study 5:

5.) You must have observed that the rate of evaporation increases with–

  • an increase of surface area:
  • We know that evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. For example, while putting clothes for drying up we spread them out.
  • an increase of temperature:

With the increase of temperature, more number of particles get enough kinetic energy to go into the vapour state.

In an open vessel, the liquid keeps on evaporating. The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings makes the surroundings cold. What happens when you pour some acetone (nail polish remover) on your palm? The particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool. After a hot sunny day, people sprinkle water on the roof or open ground because the large latent heat of vaporization of water helps to cool the hot surface.

i.) Evaporation is surface phenomenon. True or false

ii.) As temperature increases the rate of evaporation is

a.) increases

b.) decreases

c.) remains constant

iii.) The rate of evaporation increases with

a.) Increase in wind speed

b.) Decrease in wind speed

c.) Does not have any effect from wind speed

iv.) What happens when you pour some acetone (nail polish remover) on your palm?

v.) We are able to sip hot tea from saucer than from cup. Why?

Answer key-5

iv.) The particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool.

v.) We are able to sip hot tea from saucer than from cup. This is because saucer has large surface area, due to large surface area as compare to cut area tea evaporates at faster rate.

Thank you It helped me a lot

Why smell of Perfume is not a matter?

Because there is no particle

Because their are perfume particles suspended in air

These all case study questions are really helpful . Thanks

This is my first I was so nervous but these questions help me alot thank you

Smell of perfume is a matter because it have gas particles means perfume particles

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Class 9 Science Case Study Questions

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If you are wondering how to solve class 9 science case study questions, then myCBSEguide is the best platform to choose. With the help of our well-trained and experienced faculty, we provide solved examples and detailed explanations for the recently added Class 9 Science case study questions.

You can find a wide range of solved case studies on myCBSEguide, covering various topics and concepts. Class 9 Science case studies are designed to help you understand the application of various concepts in real-life situations.

The rationale behind Science

Science is crucial for Class 9 students’ cognitive, emotional, and psychomotor development. It encourages curiosity, inventiveness, objectivity, and aesthetic sense.

In the upper primary stage, students should be given a variety of opportunities to engage with scientific processes such as observing, recording observations, drawing, tabulating, plotting graphs, and so on, whereas in the secondary stage, abstraction and quantitative reasoning should take a more prominent role in science teaching and learning. As a result, the concept of atoms and molecules as matter’s building units, as well as Newton’s law of gravitation, emerges.

Science is important because it allows Class 9 Science students to understand the world around us. It helps to find out how things work and to find solutions to problems at the Class 9 Science level. Science is also a source of enjoyment for many people. It can be a hobby, a career, or a source of intellectual stimulation.

Case study questions in Class 9 Science

The inclusion of case study questions in Class 9 science CBSE is a great way to engage students in critical thinking and problem-solving. By working through real-world scenarios, Class 9 Science students will be better prepared to tackle challenges they may face in their future studies and careers. Class 9 Science Case study questions also promote higher-order thinking skills, such as analysis and synthesis. In addition, case study questions can help to foster creativity and innovation in students. As per the recent pattern of the Class 9 Science examination, a few questions based on case studies/passages will be included in the CBSE Class 9 Science Paper. There will be a paragraph presented, followed by questions based on it.

Examples of Class 9 science class case study questions

Class 9 science case study questions have been prepared by myCBSEguide’s qualified teachers. Class 9 case study questions are meant to evaluate students’ knowledge and comprehension of the material. They are not intended to be difficult, but they will require you to think critically about the material. We hope you find Class 9 science case study questions beneficial and that they assist you in your exam preparation.

The following are a few examples of Class 9 science case study questions.

Class 9 science case study question 1

  • due to its high compressibility
  • large volumes of a gas can be compressed into a small cylinder
  • transported easily
  • all of these
  • shape, volume
  • volume, shape
  • shape, size
  • size, shape
  • the presence of dissolved carbon dioxide in water
  • the presence of dissolved oxygen in the water
  • the presence of dissolved Nitrogen in the water
  • liquid particles move freely
  • liquid have greater space between each other
  • both (a) and (b)
  • none of these
  • Only gases behave like fluids
  • Gases and solids behave like fluids
  • Gases and liquids behave like fluids
  • Only liquids are fluids

Answer Key:

  • (d) all of these
  • (a) shape, volume
  • (b) the presence of dissolved oxygen in the water
  • (c) both (a) and (b)
  • (c) Gases and liquids behave like fluids

Class 9 science case study question 2

  • 12/32 times
  • 18 g of O 2
  • 18 g of CO 2
  • 18 g of CH 4
  • 1 g of CO 2
  • 1 g of CH 4 CH 4
  • 2 moles of H2O
  • 20 moles of water
  • 6.022  ×  1023 molecules of water
  • 1.2044  ×  1025 molecules of water
  • (I) and (IV)
  • (II) and (III)
  • (II) and (IV)
  • Sulphate molecule
  • Ozone molecule
  • Phosphorus molecule
  • Methane molecule
  • (c) 8/3 times
  • (d) 18g of CH ​​​​​4
  • (c) 1g of H ​​​​​​2
  • (d) (II) and (IV)
  • (c) phosphorus molecule

Class 9 science case study question 3

  • collenchyma
  • chlorenchyma
  • It performs photosynthesis
  • It helps the aquatic plant to float
  • It provides mechanical support
  • Sclerenchyma
  • Collenchyma
  • Epithelial tissue
  • Parenchyma tissues have intercellular spaces.
  • Collenchymatous tissues are irregularly thickened at corners.
  • Apical and intercalary meristems are permanent tissues.
  • Meristematic tissues, in its early stage, lack vacuoles, muscles
  • (I) and (II)
  • (III) and (I)
  • Transpiration
  • Provides mechanical support
  • Provides strength to the plant parts
  • None of these
  • (a) Collenchyma
  • (b) help aquatic plant to float
  • (b) Sclerenchyma
  • (d) Only (III)
  • (c) provide strength to plant parts

Cracking Class 9 Science Case Study Questions

There is no one definitive answer to Class 9 Science case study questions. Every case study is unique and will necessitate a unique strategy. There are, nevertheless, certain general guidelines to follow while answering case study questions.

  • To begin, double-check that you understand the Class 9 science case study questions. Make sure you understand what is being asked by reading it carefully. If you’re unclear, seek clarification from your teacher or tutor.
  • It’s critical to read the Class 9 Science case study material thoroughly once you’ve grasped the question. This will provide you with a thorough understanding of the problem as well as the various potential solutions.
  • Brainstorming potential solutions with classmates or other students might also be beneficial. This might provide you with multiple viewpoints on the situation and assist you in determining the best solution.
  • Finally, make sure your answer is presented simply and concisely. Make sure you clarify your rationale and back up your claim with evidence.

A look at the Class 9 Science Syllabus

The CBSE class 9 science syllabus provides a strong foundation for students who want to pursue a career in science. The topics are chosen in such a way that they build on the concepts learned in the previous classes and provide a strong foundation for further studies in science. The table below lists the topics covered in the Class 9 Science syllabus of the Central Board of Secondary Education (CBSE). As can be seen, the Class 9 science syllabus is divided into three sections: Physics, Chemistry and Biology. Each section contains a number of topics that Class 9 science students must study during the course.

CBSE Class 9 Science (Code No. 086)

Theme: Materials Unit I: Matter-Nature and Behaviour Definition of matter; solid, liquid and gas; characteristics – shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation. Nature of matter:  Elements, compounds and mixtures. Heterogeneous and homogenous mixtures, colloids and suspensions. Particle nature and their basic units:  Atoms and molecules, Law of constant proportions, Atomic and molecular masses. Mole concept: Relationship of mole to mass of the particles and numbers. Structure of atoms:  Electrons, protons and neutrons, valency, the chemical formula of common compounds. Isotopes and Isobars.

Theme: The World of the Living Unit II: Organization in the Living World Cell – Basic Unit of life:  Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes – basic structure, number. Tissues, Organs, Organ System, Organism: Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants).

Theme: Moving Things, People and Ideas Unit III: Motion, Force and Work Motion:  Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, derivation of equations of motion by graphical method; elementary idea of uniform circular motion. Force and Newton’s laws:  Force and Motion, Newton’s Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration. Elementary idea of conservation of Momentum. Gravitation:  Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall. Floatation:  Thrust and Pressure. Archimedes’ Principle; Buoyancy. Work, energy and power:  Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy. Sound:  Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo.

Theme: Food Unit IV: Food Production Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

PRESCRIBED BOOKS:

  • Science-Textbook for class IX-NCERT Publication
  • Assessment of Practical Skills in Science-Class IX – CBSE Publication
  • Laboratory Manual-Science-Class IX, NCERT Publication
  • Exemplar Problems Class IX – NCERT Publication

myCBSEguide: A true helper

There are numerous advantages to using myCBSEguide to achieve the highest results in Class 9 Science.

  • myCBSEguide offers high-quality study materials that cover all of the topics in the Class 9 Science curriculum.
  • myCBSEguide provides practice questions and mock examinations to assist students in the best possible preparation for their exams.
  • On our myCBSEguide app, you’ll find a variety of solved Class 9 Science case study questions covering a variety of topics and concepts. These case studies are intended to help you understand how certain principles are applied in real-world settings
  • myCBSEguide is that the study material and practice problems are developed by a team of specialists who are always accessible to assist students with any questions they may have. As a result, students may be confident that they will receive the finest possible assistance and support when studying for their exams.

So, if you’re seeking the most effective strategy to study for your Class 9 Science examinations, myCBSEguide is the place to go!

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Case Study Questions of Chapter 1 Matter in our Surroundings PDF Download

Case study Questions on Class 9 Science Chapter 1 are very important to solve for your exam. Class 9 Science Chapter 1 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 9 Science Chapter 1 Matter in our Surroundings

case study on chapter 1 class 9 science

In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Matter in our Surroundings Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 9 Science  Chapter 1 Matter in our Surroundings

Case Study/Passage-Based Questions

Question 1:

There are three states of matter – solid, liquid, and gas.

Solids  have a definite shape, distinct boundaries, and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Liquids  have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas  has an indefinite shape and no fixed volume. Gas gets the shape and volume of the container.

Gas has very low density hence is light. Gas can flow easily and hence is called fluid.

i.) Which of the following state of matter takes shape of the container in which it is filled?

d.) Both b and c

Answer: d.) Both b and c

ii.) Distance between particles of matter least in

d.) None of these

Answer: a.) Solid

iii.) Compressibility is least in case of

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NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

case study on chapter 1 class 9 science

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings Intext and Exercises question answers based on rationalised NCERT books published for session 2024-25. Get here the solutions of Page 3, Page 6, page 9, page 10 and Exercises question answers in English Medium and Hindi Medium.

Class 9 Science Chapter 1 Answers in English Medium

  • Class 9 Science Chapter 1 Exercises
  • Class 9 Science Chapter 1 Intext Questions
  • Class 9 Science Chapter 1 MCQ
  • Class 9 Science Chapter 1 Extra Questions
  • Class 9 Science Chapter 1 Hindi Medium
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  • Class 9 Science Chapter 1 Notes in Hindi
  • Class 9 Science Chapter 1 NCERT Book
  • Class 9 Science NCERT Solutions
  • Class 9 all Subjects NCERT Solutions

NCERT Class 9 Science textbook, Chapter 1 Matter in Our Surroundings covers the most of the important topics. Definition of Matter Characteristics of Matter, three states of matter – Solid, Liquid, and Gas Comparison of the characteristics of these states Interconversion of States of Matter.

The main topics of class 9 science chapter 1 Change of state melting, freezing, evaporation, and condensation Effect of change of temperature on the states of matter. Evaporation : Factors affecting the rate of evaporation Applications of evaporation. Sublimation : Definition of sublimation Examples of substances that sublime. Diffusion : Definition of diffusion Examples of diffusion in daily life Characteristics of Particles of Matter.

Download App for Class 9 all Subjects free. UP Board Solutions, NCERT Solutions, NCERT Solutions Offline Apps 2024-25 are free to download for all students using latest NCERT Books 2024-25. Here you can use NCERT Solutions of chapter 1 of Class 9 Science online or download in PDF file format for offline use. Download Class 9 Science Solutions Apps in Hindi & English version for offline use.

Particles in solids, liquids, and gases. Kinetic Theory of Matter : Explanation of the kinetic theory Explanation of the behavior of particles in matter according to the kinetic theory. Measurement of Matter : Mass and weight measuring the mass of an object Units of measurement. Density and Relative Density : Definition of density Calculation of density Relative density and its applications.

Class 9 Science Chapter 1

These are the main topics covered in Chapter 1 of the NCERT Class 9 Science textbook. This chapter provides an introduction to the fundamental concepts related to matter and its various properties. It serves as the foundation for further exploration of chemistry and physics topics in the curriculum.

Preparing for NCERT Class 9 Science Chapter 1 Matter in Our Surroundings, or any chapter, requires a systematic approach to understanding the concepts and practicing them effectively. Here are some tips on how students can prepare for this chapter in a better way. Start by reading the chapter carefully from the NCERT textbook. Pay attention to the text, diagrams, and examples provided. While reading, make concise notes of important concepts, definitions, and key points. This will help you with quick revision.

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings all the in-text questions as well as chapter end exercises question’s answers are given below. Solutions are available in Hindi and English Medium to study online or download in PDF form free.

Ensure that you have a clear understanding of fundamental concepts such as matter, states of matter, and the kinetic theory of matter. Use diagrams and illustrations provided in the book to visualize how particles are arranged in different states of matter and during phase changes. Work through the examples and exercises provided at the end of the chapter. Practice solving numerical problems related to density, and other concepts to reinforce your understanding.

If you find any topics challenging, consult additional resources like reference books, online tutorials, or videos to clarify your doubts. If you have questions or face difficulties in understanding certain concepts, don’t hesitate to seek help from your teacher or discuss them with your classmates. Where possible, perform simple experiments related to states of matter, diffusion, or density to gain practical insights into the concepts. Create Flashcards: Create flashcards for important terms, definitions, and formulas. This can help you with quick revision.

Consistent practice is key to mastering any subject. Allocate regular study time to science and review the chapter periodically. Take self-assessment quizzes or practice tests to gauge your understanding of the chapter. A few days before your exams, revise the chapter thoroughly. Focus on your notes and important points. Keep your notes, textbooks, and other study materials well-organized so that you can easily access them for review.

Science is about exploring and asking questions. Stay curious and be open to learning new concepts and ideas. Remember that understanding the fundamental concepts in Chapter 1 of Class 9 Science is crucial as it forms the basis for more advanced topics in chemistry and physics in the later chapters. Building a strong foundation in this chapter will benefit you throughout your science studies.

Tiwari Academy is an online educational platform that provides resources and materials to help students prepare for their CBSE (Central Board of Secondary Education) Class 9 Science exams, including Chapter 1. Tiwari Academy offers free access to a wide range of study materials, including NCERT solutions, textbooks, revision notes, and practice papers. These materials are designed to help students understand and revise the content effectively.

Class 9 Science Chapter 1 Extra Practice Questions

Why do substance undergo change in physical state.

Substance undergo change in physical state because both inter-particle spaces and inter-particle forces can be changed by changing the condition of temperature and pressure.

When sugar is dissolved in water, there is hardly an increase in volume. Which characteristic of matter is illustrated by this observation?

This is because of the presence of inter particle space or empty spaces. Particles or molecules of water can fill the empty space in the particles or molecules of sugar and vice versa. That is why there is hardly any change in the volume as a result of dissolution of sugar in water.

Define gaseous state of a substance.

A substance is said to be in the gaseous state if under normal pressure, its boiling point is below the room temperature.

How does pressure help in the liquefication of a gas?

Increase in pressure helps in the liquefication of a gas. The particles or molecules of a gas come closer and closer as the pressure is being increased gradually. They ultimately condense and as a result, the gas liquefies or changes into the liquid state.

Solids are generally very heavy while gases are light. Explain.

In the solids, the particle are very closely packed. As a result, the number of particles per unit volume is quite large. Therefore, the solids are normally quite heavy. In the gases, the particles are loosely packed. The number of particle per unit volume is completely small. Therefore, gases are light.

Tiwari Academy offers comprehensive NCERT solutions for Class 9 Science Chapter 1, guiding students step-by-step through exercises in the NCERT textbook. These solutions are invaluable for students, helping them decipher the best ways to tackle diverse problems. The platform might also feature video tutorials that break down intricate concepts of the chapter. By using visual tools and explanations, students can more easily understand challenging subjects.

By working through additional exercises and questions, students solidify their comprehension and enhance their problem-solving capabilities. Tiwari Academy typically provides succinct and organized revision notes, which are instrumental for quick recaps of the chapter’s main ideas and crucial details. Some digital platforms, including Tiwari Academy, even have online exams that emulate the actual test atmosphere, which can be instrumental for student evaluation and exam readiness.

Class 9 Science Chapter 1 Matter in Our Surroundings

Question 1: Solids are normally not compressible. Why can a sponge be readily pressed? Answer 1: A sponge made up of rubber has a large number of fine pores in which air remains filled. When the sponge is pressed, the air from the pores escapes and vacant space are left. Therefore, the sponge can be readily pressed on applying pressure.

Accessible around the clock, Tiwari Academy’s digital tools let students learn at a rhythm that suits them. This constant availability is especially beneficial for those who wish to revisit the chapter several times. Doubt Resolution: Certain online educational platforms grant students the opportunity to post their chapter-related queries. These queries might be addressed by seasoned educators or tutors, offering students needed explanations. Additionally, Tiwari Academy might have archives of past exam papers with their solutions. Working on these papers can assist students in acclimating to the exam structure and honing their time-management skills.

Question 2: Why do we sweat on a humid day? Answer 2: In humid day, the air around us has already high percentage of water vapours. Therefore, the water coming from the skin gets less opportunity to charge into vapours and remains sticking to our body. We therefore, swear more on a humidity day.

Tiwari Academy online platforms have discussion forum where students can interact, share their experiences, and seek advice from peers. It’s important to note that the availability of specific resources and features may vary on Tiwari Academy or any other educational platform. Students should explore the platform to determine which resources are most helpful for their individual learning needs and preferences. Additionally, using a combination of resources, including the official NCERT textbook, school notes, and online materials like Tiwari Academy, can provide a comprehensive approach to exam preparation.

From an examination point of view, NCERT Class 9 Science Chapter 1 Matter in Our Surroundings, holds significant importance for several reasons. Chapter 1 introduces fundamental concepts related to matter, states of matter, and the kinetic theory of matter. These concepts serve as the foundation for understanding more advanced topics in chemistry and physics in higher classes. A strong grasp of these basics is crucial for building a solid scientific knowledge base.

Question 3: Kelvin scale of temperature is regarded as better than the Celsius scale. Give reason. Answer 3: In the Celsius scale of temperature we often come across a negative sign for the temperature (e.g., -8.5⁰C). Since the sign is always positive in the Kelvin scale, it is regarded as better.

Questions from 9th science chapter 1 are often included in Class 9 Science examinations. This chapter is considered an essential part of the curriculum, and students can expect to see questions related to states of matter, properties of matter, and related calculations in their exams. Chapter 1 helps students develop a deeper understanding of how matter behaves, how particles are arranged in different states, and how temperature affects matter. This conceptual understanding is not only essential for exams but also for a broader understanding of science.

The chapter 1 of 9th science includes numerical problems related to density and the states of matter. These problems require students to apply mathematical concepts to scientific scenarios, which is a valuable skill for both exams and real-world applications. The concepts discussed in Chapter 1 are applicable to various everyday situations, such as cooking, weather changes, and material properties. Understanding these applications can help students relate science to their daily lives and answer practical questions in exams.

Important Questions on 9th Science Chapter 1

Naphthalene balls disappear with time without leaving any solid. why.

Naphthalene shows the property of sublimation. Evaporation of naphthalene takes place easily and so it disappears during course of time without leaving a solid.

We can get the smell of perfume sitting several meters away. Why?

Perfumes vaporize very fast and its vapours diffuse into air easily. That is why we can smell perfume sitting several meters away.

Water at room temperature is a liquid. Give reason.

Water at room temperature is a liquid because it has fluidity and has definite volume but no definite shape.

An iron almirah is a solid at room temperature. Give reason.

An iron almirah is a solid at room temperature because it is rigid and has a definite shape.

Why is ice at 273 K more effective in cooling than water at the same temperature?

Ice at 273 K is less energetic than water. It is because of the difference in the latent heat of fusion which is present in water at the same temperature in the form of extra energy.

What produces more severe burns, boiling water or steam?

Steam produces more severe burns than boiling water. This is because steam has more energy than boiling water, present in it in the form of latent heat of vaporization.

Successfully mastering the first chapter of the textbook can boost a student’s confidence in their ability to handle the rest of the science curriculum. It sets a positive tone for the subject and encourages students to explore further. The knowledge gained from Chapter 1 will be built upon in higher classes. Topics like states of matter, kinetic theory, and properties of matter are revisited and expanded upon in later chapters and classes.

A strong foundation in Chapter 1 is, therefore, essential for future success. In summary, NCERT Class 9 Science Chapter 1 is not only important for scoring well in exams but also for laying the groundwork for a deeper understanding of science in the later stages of education. Students should dedicate time and effort to comprehensively learn the concepts presented in this chapter to ensure a strong foundation in science.

Class 9 Science Chapter 1 Matter in Our Surroundings

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CBSE Class 9 Science Important Case Study Questions with Answers for Term 2 Exam 2022 (PDF)

Check important case study questions of cbse class 9 science to prepare for the cbse term 2 exam 2022. all these questions have been put together by subject experts..

Gurmeet Kaur

CBSE Class 9 Term 2 Exam 2022:  Important case based questions for CBSE Class 9 Science are provided here students to prepare for the upcoming Term 2 Exam 2022. All the questions provided below are curated by the subject experts. These questions are really helpful to revise important concepts and prepare the case study questions for the exam. Answers to all questions have been provided for reference. So, students should practice the chapter-wise questions to clearly understand the right way to attempt the case based questions. Download the chapter-wise questions in PDF.

Check some of the important case study questions below:

Q. Read the following and answer the questions :

A student was asked by his teacher to verify the law of conservation of mass in the laboratory. He prepared 5% aqueous solutions of NaCl and Na 2 SO 4 . He mixed 10 mL of both these solutions in a conical flask. He weighed the flask on a balance. He then stirred the flask with a rod and weighed it after sometime. There was no change in mass.

  • Was the student able to verify the law of conservation of mass?
  • If not, what was the mistake committed by him?
  • In your opinion, what he should have done?
  • What is the molar mass of Na 2 SO 4 ?
  • No, he could not verify the law of conservation of mass in-spite of the fact that there was no change in mass.
  • No chemical reaction takes place between NaCl and Na 2 SO 4 . This means that no reaction actually took place in the flask.
  • He should have performed the experiment by using aqueous solutions of BaCl 2 and Na 2 SO 4 . A chemical reaction takes place in this case and a white precipitate of BaSO 4 is formed.
  • Will the weight of the precipitate be the same as that of the reactants before mixing?
  • If not, what she should have done?
  • Which law of chemical combination does this support?
  • State the law of conservation of mass.
  • No, it will not be the same.
  • She should have weighed the total contents of the beaker after the reaction and not the precipitate alone.
  • It supports the law of conservation of mass.
  • Mass can neither be created nor destroyed during a chemical reaction.

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case study on chapter 1 class 9 science

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

NCERT Solutions for Class 9 Science (chemistry) Chapter 1 Matter in Our Surroundings are given below. In these solutions, we have answered all the intext and exercise questions provided in NCERT class 9 science textbook. Class 9 NCERT Solutions Science Chapter 1 provided in this article are strictly based on the CBSE syllabus and curriculum. Students can easily download these solutions in PDF format for free from our app.

Class 9 Science Chapter 1 Textbook Questions and Answers

Intext Questions

Question 1:  Which of the following are matter? 

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume. 

Answer: Chair, air, almonds, and cold-drink are matters. 

Explanation: Things that occupy space and have some mass are called matter. Since chair, air, almonds and cold-drink occupy some space and have some mass, so these are matter.

Question 2: Give reasons for the following observation: 

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. 

Answer: The smell of hot sizzling food reaches severed meters away, as the particles of hot food have more kinetic energy and hence the rate of diffusion is more than the particles of cold food.

  Smell of anything comes because of gases emanating from the given thing. The smell reaches to us because of diffusion of gas. The rate of diffusion increases with increase in temperature. This happens because of higher kinetic energy due to higher temperature. That is why smell of hot sizzling food reaches to us from several feet. On the other hand, the kinetic energy of gases emanating from cold food is low because of lower temperature. Due to this, we need to move closer to a cold food to take its smell.

Question 3: A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? 

Answer: A diver is able to cut through water in a swimming pool. This shows that the particles of water have intermolecular space and has less force of attraction.

 Question 4: What are the characteristics of particles of matter? 

Answer: The characteristics of particles of matter are:

  • Particles of matter have spaces between them. 
  • Particles of matter are continuously moving. 
  • Particles of mater attract each other.

Question 1:  The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density − air, exhaust from chimney, honey, water, chalk, cotton, and iron. 

Answer: The given substances in the increasing order of their densities can be represented as: 

Air < Exhaust from chimney < Cotton < Water < Honey < Chalk < Iron  

Explanation:  Air is the mixture of gases. Chimney exhaust is also a mixture of gases; along with some heavier particles, such as ash. This makes the density of chimney exhaust more than air. Cotton is a porous solid and which has lot of air trapped within pores. This makes its volume more than water. Therefore, it is less dense than water.

Question 2:  (a) Tabulate the differences in the characteristics of states of matter. (b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.

Answer:  (a) The differences in the characteristics of states of matter are given in the following table. 

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings image 1

The difference in the characteristics of the three states of matter.

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings image 2

(b) Rigidity:  The greatest force of attraction between particles and close packing of particles make solids rigid. Rigidity is one of the unique properties of solids. Because of rigidity, a solid can resist from getting distorted. Because of rigidity a solid has definite shape and volume. Rigidity is negligible in fluid and gas.

Compressibility:  Compressibility is one of the most important characteristics of gas. Because of lot of space between particles, a gas can be compressed to a great extent.

Liquid and solid cannot be compressed because of the least space between their particles.

Fluidity:  The ability to flow is called fluidity. The less force of attraction and more space between particles make liquid and gas to flow. That’s why liquid and gas are called fluid.

Filling of a gas container:  Liquids do not fill a gas container completely, while gases fill the gas container completely in which it is kept. This is because the particles of gas can move in all the directions.

Shape:  Solids have fixed shape. Liquid and gas take the shape of the container in which they are kept. This happens because of less force of attraction and more kinetic energy between particles of liquids and negligible force of attraction and highest kinetic energy between particles of gas.

Kinetic energy:  The kinetic energy of particles of solid is the minimum. They only vibrate at their fixed position. The kinetic energy of particles of liquid is more than that of solid. But they can slide above one another. The kinetic energy of particles of gas is the maximum.

Density:  The mass per unit volume of a substance is called density. The density of solid is highest, of liquid is less than solid and of gas is minimum.

Question 3:  Give reasons:  (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.

Answer:  (a) There is little attraction between particles of gas. Thus, gas particles move freely in all directions. Therefore, gas completely fills the vessel in which it is kept.

(b)  Because of negligible force of attraction between particles of gas, the particles of gas have the highest kinetic energy. These properties enable the particles of gas to move in all directions and hit the walls of container from all sides. Because of this a gas exerts pressure on the walls of the container in which it is kept.

(c) A wooden table has a definite shape and volume. It is very rigid and cannot be compressed i.e., it has the characteristics of a solid. Hence, a wooden table should be called a solid.

(d) Particles of air have large spaces between them. On the other hand, wood has little space between its particles. Also, it is rigid. For this reason, we can easily move our hands in air, but to do the same through a solid block of wood, we need a karate expert.

Since, air is gas, so its particles are loosely packed and there is negligible force of attraction between its particles. Because of that we can easily move our hand in air. But wood is a solid, so the force of attraction between its particles is greatest. The particles of wooden block are closely packed. That’s why we cannot move our hand through a solid block of wood. However, a karate expert can exert required pressure to break the great force of attraction of the particles of a solid wooden block.

Question 4:  Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why. 

Answer: During freezing of water, some space between the particles of water is left vacant with some air trapped between them. These empty spaces having air in them makes the density of ice; lower than that of water. That’s why ice floats on water.

Question 1: Convert the following temperatures into the Celsius scale. (a) 300 K (b) 573 K

Answer: (a) 300 K = (300 − 273)°C = 27°C (b) 573 K = (573 − 273)°C = 300°C

Question 2: What is the physical state of water at (a) 250°C  (b) 100°C

Answer: (a) Water at 250°C exists in gaseous state.

(b) At 100°C, water can exist in both liquid and gaseous form. At this temperature, after getting the heat equal to the latent heat of vaporization, water starts changing from liquid state to gaseous state.

Question 3:  For any substance, why does the temperature remain constant during the change of state? 

Answer: During a change of state, the temperature remains constant. This is because all the heat supplied to increase the temperature is utilized (as latent heat) in changing the state by overcoming the forces of attraction between the particles. Therefore, this heat does not contribute in increasing the temperature of the substance. 

Question 4:  Suggest a method to liquefy atmospheric gases. 

Answer:  Atmospheric gas is liquefied by increasing pressure and decreasing temperature.

PAGE NO. 10

Question 1:  Why does a desert cooler cool better on a hot dry day?

Answer: Desert cooler works on the basis of evaporation. In hot and dry days the moisture level is very low in atmosphere which increases the rate of evaporation. Because of faster evaporation, cooler works well. That’s why desert cooler cool better on a hot dry day.

When a liquid evaporates, the particles of the liquid absorb energy from the surroundings to compensate the loss of energy during evaporation. This makes the surroundings cool. 

In a desert cooler, the water inside it is made to evaporate. This leads to absorption of energy from the surroundings, thereby cooling the surroundings. Again, we know that evaporation depends on the amount of water vapour present in air (humidity). If the amount of water vapour present in air is less, then evaporation is more. On a hot dry day, the amount of water vapour present in air is less. Thus, water present inside the desert cooler evaporates more, thereby cooling the surroundings more.  That is why a desert cooler cools better on a hot dry day. 

Question 2:  How does water kept in an earthen pot (matka) become cool during summers?

Answer: Water from porous wall of earthen pot evaporates continuously, which lowers the temperature of water kept in the earthen pot. In summer moisture level is very low in the atmosphere, which increases the rate of evaporation as evaporation is inversely proportional to the moisture level in atmosphere. That is why in summer water kept in earthen pot becomes cool.

Question 3: Why does our palm feel cold when we put some acetone or petrol or perfume on it?

Answer: When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surrounding or the surface of the palm to compensate for the loss of energy, making the surroundings cool. Hence, our palm feels cold when we put some acetone or petrol or perfume on it.

Question 4: Why are we able to sip hot tea or milk faster from a saucer than a cup? 

Answer: When hot tea or milk is kept in a saucer, the liquid is exposed over a larger surface area as compared to in case of the liquid being kept in a cup. The larger surface area enables the faster cooling. That’s why we are able to sip hot tea or milk faster from a saucer rather than from a cup.

Question 5:   What type of clothes should we wear in summers? 

Answer: In summer, it is preferred to wear light-coloured cotton clothes because light colour reflects heat and cotton materials have pores that absorb sweat, facilitating their evaporation hence causing a cooling effect in the skin.

Question 1: Convert the following temperatures into the Celsius scale. (a) 293 K (b) 470 K

Answer: Temperature in Celsius scale = Temperature in Kelvin scale – 273

(a) 293K= (293 – 273)°C = 20°C

(b) 470K= (470 – 273)°C = 197°C

Question 2: Convert the following temperatures into the Kelvin scale.  (a) 25°C (b) 373°C

Answer: Temperature in Kelvin scale = Temperature in Celsius scale + 273

(a) 25°C = (25+273)K = 298K

(b) 373°C = (373+273)K = 646K

Question 3: Give reasons for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume while sitting several metres away.

Answer: (a) At room temperature, naphthalene balls undergo sublimation wherein they directly get converted from a solid to a gaseous state without having to undergo the intermediate state, i.e., the liquid state.

(b) Perfumes vaporize very fast and its vapours diffuse into air easily. That is why we can smell perfume sitting several meters away. 

Question 4: Arrange the following in increasing order of forces of attraction between the particles – water, sugar, oxygen.

Answer:  Oxygen < Water < Sugar.

Explanation: Oxygen is a gas, thus force of attraction is negligible between particles. Water is a liquid, thus force of attraction between particles is more than liquid and less than solid. Sugar is a solid, thus force of attraction between particles is greatest.

Question 5: What is the physical state of water at — (a) 25°C                       (b) 0°C                               (c) 100°C?

Answer: (a) At 25°C – water is in liquid state. (b) At 0°C – water is in solid state. (c) At 100°C – water is in transition state, i.e. in liquid and gas both.

Question 6: Give two reasons to justify: (a) water at room temperature is a liquid. (b) an iron almirah is a solid at room temperature.

Answer: (a) At room temperature (25 °C), water is a liquid because it has the following characteristic of liquid:

(i) Water has definite volume, but not definite shape as it takes the shape of the container in which it is kept. (ii) Water flows at room temperature.  

(b) An iron almirah is a solid at room temperature because: (i) It has definite shape. (ii) It has definite volume.

Question 7: Why is ice at 273 K more effective in cooling than water at the same temperature?

Answer: At 273K ice requires more latent heat to melt into water, while water at 273K requires less latent heat; to come to the room temperature. So, ice at 273 K is more effective in cooling than water at the same temperature.

Question 8: What produces more severe burns, boiling water or steam?

Answer: Steam produces more severe burns than boiling water. This is because steam has more energy than boiling water, present in it in the form of latent heat of vaporization.

Question 9: Name A, B, C, D, E and F in the following diagram showing change in its state:

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings image 3

Answer: A: Melting (or) fusion (or) liquefaction B: Evaporation (or) vaporization C: Condensation D: Solidification E: Sublimation F: Sublimation

Class 9 Science NCERT Solutions Chapter 1 Matter in Our Surroundings

CBSE Class 9 Science NCERT Solutions Chapter 1 helps students to clear their doubts and to score good marks in the board exam. All the questions are solved by experts with a detailed explanation that will help students complete their assignments & homework. Having a good grasp over CBSE NCERT Solutions for Class 9 Science will further help the students in their preparation for board exams and other competitive exams such as NTSE, Olympiad, etc.

NCERT Solutions for Class 9 Science Chapter 1 PDF

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NCERT Solutions for Chapter 1 Matter in Our Surroundings Class 9 Science

Which of the following are matter ?

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.

The mass per unit volume of a substance is called density (density = mass/volume).

Air, Exhaust from chimneys, cotton, water, honey, chalk, and iron.

→ Rigidity: It is the property of matter to resist the change of its shape. → Compressibility: It is the property of matter in which its volume is decreased by applying force. → Fluidity: It is the ability of matter to flow. → Filling a gas container: On filling a gas takes the shape of the container. → Shape: Having definite boundaries. → Kinetic Energy: It is the energy possessed by the particles of matter due to its motion. → Density: It is the ratio of mass with per unit volume.

(a)  The force of attraction between particles of gas is negligible. Because of this, particles of gas move in all directions. Thus, a gas fills the vessel completely in which it is kept.

(b)  Particles of gas move randomly in all directions at high speed. As a result, the particles hit each other and also hit the walls of the container with a force. Therefore, gas exerts pressure on the walls of the container.

(c)  A wooden table has fixed shape and fixed volume, which are the main characteristics of solid. Thus a wooden table should be called a solid. (d) Particles of the air have large spaces between them. On the other hand, wood has little space between its particles. Also, it is rigid. For this reason, we can easily move our hands in the air, but to do the same through a solid block of wood, we need a karate expert.

► 300 K = (300 - 273)°C

► 573 K = (573 - 273)°C

What is the physical state of water at:

(b)  Since water boils at this temperature thus it   can exist in both liquid and gaseous form. At this temperature, after getting the heat equal to the latent heat of vaporisation, water starts changing from liquid state to gaseous state.

For any substance, why does the temperature remain constant during the change of state ?

(For Conversion Process we must know, Kelvin is an SI unit of temperature, where 0°C = 273 K approx.)

case study on chapter 1 class 9 science

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CBSE Class 9 Science Chapter-1 Important Questions - Free PDF Download

Chapter 1 of science in class 9 talks about matters of our surroundings. Many students consider science as a difficult and challenging subject as they face difficulty in understanding the concepts and theories of this subject. The best way to overcome this problem is to start practising Class 9 Science chapter 1 important questions. Solving these questions regularly will help the students to improve their skills on this subject. Thus, scoring good marks in the exams becomes easy for them. M atter in our surroundings class 9 important questions guides students in their preparation to make them efficient. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions, they can download Class 9 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

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Important Questions of Ch 1 Science Class 9 - Free PDF Download

Very Short Answer Questions 1 Mark 

1. Which of the following matter? 

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, the smell of perfume. 

Ans: As we can define matter as any ‘physical substance’, hence almonds,  air, chair, the smell of perfume, cold drink and smell can be considered as matter. 

2. Convert the following temperature to a Celsius scale: 

i) The temperature is 300 K. 

Ans: When we use: K = 273 + ⁰C:

                                  ⁰C = K - 273

                                        = 300 - 273

                                        = 27⁰C

ii) The temperature is 573 K 

                                  ⁰C = 573 - 273

                                       = 300 ⁰C

3. What is the physical state of water at:  

(a) A temperature of 250 ⁰C 

Ans: The boiling point of water is 100 ⁰C, hence the physical state of water at 250⁰C will be gaseous.

(b) A temperature of 100 ⁰C 

Ans: The boiling point of water is 100 ⁰C, hence at 100 ⁰C water is in the gaseous state. 

4. For any substance, why does the temperature remain constant during the change of state? 

Ans: The reason behind the temperature of substance or matter remaining constant during a change of state is that during the change of state all of the heat or energy provided to particles of matter is utilized to take the particles of matter apart from each other. 

5. Suggest a method to liquefy atmospheric gases. 

Ans: One method to liquefy atmospheric gases is to decrease the temperature and increase the pressure. 

6. Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, and oxygen. 

Ans: The order of increasing forces of attraction between the particles is as  follows: 

Oxygen< water< sugar.

7. What is the physical state of water at- 

(a) A temperature of 25 ⁰C? 

Ans: The physical state of water at 25 ⁰C is liquid. 

(b) A temperature of ⁰C? 

Ans: The physical state of water at ⁰C is solid. 

(c) A temperature of 100⁰C? 

Ans: The physical state of water at 100⁰C is gas.

8. If the humidity in the air increase then the rate of evaporation: 

(a) decrease 

(b) increase 

(c) remain same 

(d) both (b) and (a) depending upon the temperature  

Ans: The correct option is (a) decrease. 

9. Which of the following statements is correct? 

(a) boiling is a bulk phenomenon and evaporation is a surface phenomenon (b) boiling is a surface phenomenon and evaporation is a bulk phenomenon (c) boiling and evaporation both are a surface phenomenon 

(d) boiling and surface both are bulk phenomenon 

Ans: The correct option is (a) boiling is a bulk phenomenon and evaporation is a  surface phenomenon. 

10. If the temperature of a place is increase then evaporation: 

(d) none of the above  

Ans: The correct option is (b) increase. 

11. Which of the following has the least inter atomic spacing? 

(a) solid 

(b) liquid 

(c) gases 

(d) plasma  

Ans: The correct option is (a), solid.

12. If you decrease the surface area and increase the temperature, then the  rate of evaporation 

(a) increase 

(b) decrease 

(d) may increase or decrease depending upon other factors 

Ans: The correct option is (c), remain the same. 

13. What will be the corresponding temperature in degree centigrade for 300 K:  

(a) 30 ⁰C 

(b) 300 ⁰C 

(c) 27 ⁰C 

(d) 673 ⁰C 

Ans: The correct option is (c), 27 ⁰C. 

14. Liquid to gas and gas to liquid changes are called: 

(a) vaporization and condensation 

(b) condensation and vaporization 

(c) sublimation and condensation 

(d) condensation and sublimation  

Ans: The correct option will be (a), vaporization and condensation. 

15. Physical state of water at is respectively 

(a) liquid, solid, and gas 

(b) solid, liquid, and gas 

(c) solid, gas, and liquid 

(d) gas, solid, and liquid

Ans: The correct option is (a), liquid, solid and gas. 

Short Answer Questions                                                   2 Marks 

1. Give reasons for the following observation: 

The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close. 

Ans: When it is a higher temperature the diffusion rate (movement) of particles will be very fast when compared to the diffusion rate of particles at a lower temperature and since the temperature of hot sizzling food is higher than cold food, the smell of hot sizzling food will be reaching us from several meters away. 

2. The mass per unit volume of a substance is called density. (density = mass/volume). 

Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton, and iron. 

Ans: The correct order of increasing densities of the substances is as follows: Air < exhaust from chimneys< cotton< water< honey< chalk< iron. 

3. Liquids generally have a lower density as compared to solids. But you must have observed that ice floats on water. Find out why. 

Ans: Ice floats on the water since there is a large empty space inside the 3D structure of ice due to which it becomes less in weight as compared to water and can float on water. 

4. Why does a desert cooler cool better on a hot dry day? 

Ans: In a desert cooler, when hot air enters through the straw mates it evaporates the water at a fast rate because the rate of evaporation is faster on a hot dry day.  And because of the faster evaporation rate, it cools the air more conveniently than on a dry hot day. 

5. How does the water kept in an earthen pot (matka) become cool during summer? 

Ans: Evaporation happens through the small pores on it causing a cooling effect, in an earthen pot. Therefore water kept in an earthen pot becomes cool during summer because of continuous evaporation. 

6. Why does our palm feel cold when we put some acetone or petrol or perfume on it? 

Ans: As a perfume, petrol and perfume are volatile liquids, if put on our palm they will be absorbing heat from our palm and cause cooling. 

7. Why are we able to sip hot tea or milk faster from a saucer rather than a  cup? 

Ans: When we use a saucer instead of a cup the surface for evaporation to occur will be increased resulting in faster evaporation of particles of tea or milk and allowing it to cool faster and taking a sip becomes easier. 

8. What type of clothes should we wear in summer? 

Ans: We must wear the type of clothes which allow easy evaporation since evaporation causes cooling. And as the cotton absorbs sweat well and allows easy evaporation, we must prefer wearing cotton clothes in summer. 

9. Convert the following temperatures to the Celsius scale.  

a) The temperature is 293 K 

Ans: When we use: ⁰C = K - 273 

                                        = 293 - 273 

                                       = 20 ⁰C

b) The temperature is 470 K 

= 470 - 273 

= 197 ⁰C 

10. Convert the following temperatures to the Kelvin scale. 

a) The temperature is 25 ⁰C

Ans: When we use: K = ⁰C + 273 

                                       = 25 + 273

                                      = 298 K 

b)The temperature is 373 ⁰C 

                                       = 373 + 273

                                       = 656 K 

11. Give a reason for the following observations. 

a) Naphthalene balls disappear with time without leaving any solid. 

Ans: Sublimation can be defined as the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. Naphthalene balls will be having the property of sublimation because of which they directly vary from solid to gaseous state without a conversion into liquid. Hence, naphthalene balls will be vanishing with time leaving no solid. 

b)We can get the smell of perfume sitting several meters away. 

Ans: Volatile substances such as perfumes change from liquid state to gaseous state very fast which allows them to diffuse and mix up with the air particles to reach our nostrils. Therefore we get the smell of perfume sitting several metres away. 

12. Give two reasons to justify - 

a) Water at room temperature is a liquid. 

Ans: For a temperature of <0 ⁰Cwater is in solid-state, for 0⁰C → 100⁰C → water is in a liquid state and for temperature >100 ⁰C water is in a gaseous state. Since room temperature always lies between 0 ⁰C and 100 ⁰C and within this range the physical state of water is liquid so water is liquid at room temperature. 

b) An iron almirah is a solid at room temperature. 

Ans: Since the room temperature is very less than the melting point of iron hence an almirah made up of iron will be a solid at room temperature.

13. Why is ice at 273 K more effective in cooling than water at the same temperature? 

Ans: Ice will be producing a more intense cooling effect as compared to water at  273 K because at 273 K ice will be absorbing latent heat of melting from the surroundings and will be getting converted into water. Therefore ice at 273 K is more effective in cooling than water at the same temperature. 

14. What produces more severe burns, boiling water or steam? 

Ans: When the steam gets converted into boiling water it releases latent heat of water which results more severe burns when we compare it to boiling water. 

15. What is evaporation? What are the factors affecting it? 

Ans: Evaporation can be defined as the process of conversion of a substance from its liquid state to a gaseous state at any temperature below its boiling point. 

Evaporation will be dependant on the factor below: 

a) Surface area 

b) Temperature 

c) Humidity  

d) Wind speed  

16. What happens when we apply pressure to the particles of matter? 

Ans: Pressure can be defined as the force applied per cross-sectional area.  Therefore when we apply pressure to the particles of matter, the force applied brings the particles closer to each other. 

17. Define latent heat of vaporization and latent heat of fusion. 

Ans: The heat energy required to change 1 kg of a substance from its liquid state to a gaseous state at atmospheric pressure without changing its temperature is known as latent heat of vaporization. 

18. If the melting point of object A is high then what state do you expect it to be at room temperature? 

Ans: The temperature at which a substance changes its state from solid to liquid is called its melting point. At a temperature below melting point, the substance will be in solid-state. Therefore, if the melting point of an object A is high then the object will be in solid-state. 

19. What happens when the temperature of the solids increase? 

Ans: When we increase the temperature of the solid, we are giving energy to it.  That energy is utilized in increasing the kinetic energy of the particles and as a  result, the speed of the particles is increased and they vibrate more freely. Once the particles overcome the force of attraction between them they start moving more freely. 

20. When heat is being supplied to a solid, then what does the heat energy do  to the particles of the solid? 

Ans: The heat energy increases the kinetic energy of the particles which allows the particles to overcome the forces of attraction and start moving more freely and changing the state from solid to liquid. 

21. Why is it that on increasing the wind speed the rate of evaporation increases? 

Ans: If we increase the speed of the wind, then they will be blowing away with them.  The water vapours in the air are blown away when the speed of wind is increased,  making room for more water vapours and increasing the rate of evaporation. 

22. Why do we say that evaporation is a surface phenomenon? 

Ans: Only the particles at the surface of the liquid absorb energy and get converted into vapours, therefore evaporation is called a surface phenomenon. 

Long Answer Questions 3 Marks 

1. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? 

Ans: It is given that a diver is able to cut through water in a swimming pool. This is representing that the particles of water will be held together by weak forces of attraction between them and when any external force is applied the particles can be separated.

2. What are the characteristics of the particles of matter?  

Ans: The particles of matter have the following characteristics: 

i. The particles of matter are in continuous motion. 

ii. There are gaps between the particles of matter. 

iii. There is a force of attraction between the particles of matter which keeps them together. 

3.  

(a) Tabulate the differences in the characteristics of states of matter. Ans: Tabular differences in characteristics of matters are given below: 

(b) Comment upon the following: rigidity, compressibility, fluidity, filling a  gas container, shape, kinetic energy, and density. 

Rigidity → The property of matter to maintain its shape when external forces are applied to it is known as rigidity. Solids have this property.

Compressibility → The property of matter to allow compression when high pressure is applied to it is known as compressibility. Some Liquids and all gases have this property. 

Fluidity → The property of matter to flow and change in its shape when external forces are applied to it is known as fluidity. Both liquids and gases have this property. 

Filling a gas container → Gases are fluid in nature and are highly compressible which allows them to be filled within a vessel at high pressure. A large volume of gas can be filled in a container of less volume making it suitable and more cost-efficient for transportation. 

Shape → Only solid objects have well-defined shapes while liquids can acquire any shape depending on the container they are kept in and gases don’t have any shape. 

Kinetic energy → The particles of a matter are continuously in motion and thus have kinetic energy. As the particles in solids have the least movement, the kinetic energy of solids is the least. The particles of gases have the freest movements and hence they have the highest kinetic energy. The order of kinetic  energies for different types of matters is: solid < liquid < gas  

Density → Density of any substance can be explained as Mass per unit volume i.e. density = mass/volume. 

4. Give reasons 

(a) A gas fills completely the vessel in which it is kept. 

Ans: The particles of gas have negligible attraction force between them because of which the particles move freely in all directions filling the whole container the gas is kept in. 

(b) A gas exerts pressure on the walls of the container. 

Ans: The particles of gas move freely due to which they collide with the container walls continuously and randomly. Therefore the collision of particles on the container walls exerts pressure on the walls.

(c) A wooden table should be called a solid. 

Ans: Solids have rigid and fixed particles and have a definite shape and clear boundaries. Since a wooden table possesses all the qualities of a solid, it should be called a solid. 

(d) We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expert. 

Ans: Since air is a gas and the forces of attraction between the particles of gas are very less which makes it easy to separate the particles with the help of an external force and hence we can easily move our hand in the air. Whereas in the case of solids the forces of attraction are very strong and we need a very high force to separate the particles of a solid and hence we need a karate expert for it. 

5. Name A, B, C, D, E, and F in the following diagram showing changes in its state. 

Factors that change States of Matter

A is fusion or heating or melting.  

B is vapourisation. 

C is cooling or Condensation. 

D is cooling or solidification.

E is sublimation.  

F is solidification. 

6. Are the three states of matter inter-convertible? How can they interconnect? 

Ans: Yes, the three states of matter can be converted into each other. 

States of Matter are interconvertible

The three states of matter are interconvertible as shown below: 

a) By heating we can convert solids into liquids and by cooling we can convert liquids into solids. 

b)We can convert liquids into gases by vaporization and we can convert gases to liquids by condensation. 

c) Using sublimation we can convert solids into gases and vice versa and using condensation we can convert liquids into solids. 

7. How does evaporation cause cooling? 

Ans: During evaporation, the particles of a liquid absorb the heat from the surface and are converted into vapours utilizing the absorbed heat. This absorption of heat from the surface will be producing a cool surface. 

8. Why should we wear cotton clothes in summer? 

Ans: Since cotton is a good absorbent of water, it absorbs all the sweat from our body and allows easy and fast evaporation. The sweat absorbs heat from our body and evaporates which makes us feel cooler during a hot summer day. That is why we should wear cotton clothes in summer. 

9. Differentiate between physical and chemical change? 

Ans: The difference physical and chemical change is given below 

10. A solution of H₂SO₄ is labeled 40%. The density of the solution is  1.3 gm/l. What is the concentration of the solution in %(m/v)? 

Ans: The given concentration of the solution is 40%. 

Therefore, 100 gm of the solution contains 40 g of H₂SO₄  

Density = \[\frac{mass}{volume}\]

1.3gm/l = \[\frac{100 g}{volume}\]

Volume of the solution = \[\frac{100}{1.3}\]

= \[\frac{100}{1.3}\] ml

So, = \[\frac{100}{1.3}\] of the solution contains 40g of H₂SO₄

Therefore, 100 ml of solution will contain \[\frac{100 \times 40 \times 1.3}{100}\] g of H₂SO₄

= 52 g of H₂SO₄

Therefore, the concentration is 52% (m/v).

11. What is the state of inter particle distance inside a solid, liquid, and gas? 

Ans: In a solid, the forces of attraction between the particles are very high and hence the particles of a solid will be very close to each other and the inter particle distance is the least. 

In a liquid, the forces of attraction between the particles are very weak, and therefore the particles of a liquid will not be closely packed with each other and the inter-particle distance is large.  

In a gas, the forces of attraction between the particles are almost negligible or extremely weak and therefore the particles of a gas are very loosely packed and are very far from each other and the inter particle distance is largest. 

12. Why is it that to smell cold food, we have to go close but the smell of hot food reaches us several meters away? 

Ans: When the particles are at higher temperature, their movements are fast and therefore they can travel up to several meters. Hence the hot food’s smell will be reaching us several meters away. 

At lower temperatures, the movements of particles are not very fast and particles do not have enough kinetic energy to travel a distance of several meters.  Therefore we have to go close to smell cold food. 

13. Why is it that a wooden chair should be called a solid and not a liquid? 

Ans: A wooden chair is a rigid object, the particles of a wooden chair are tightly packed with each other, the chair has a definite shape and the chair has negligible compressibility. Since a wooden chair possesses all the properties of a solid and not of a liquid, it should be called a solid, not a liquid.

14. Give an experiment to show that ammonium chloride undergoes sublimation. 

Ans: Experiment for representing the sublimation of ammonium chloride (NHCl₄): 

a) Take a crystal of ammonium chloride (NHCl₄) inside a china dish and an inverted funnel. 

b) With the help of a burner, heat the ammonium chloride (NHCl₄) crystals. 

c) When the ammonium chloride (NHCl₄) crystal is heated, vapours of (NHCl₄) and the Ammonium chloride (NHCl₄) which is solidified along the walls at the beaker’s upper end is observable. 

d) This experiment shows that solid ammonium chloride (NHCl₄) undergoes solidification. It directly changes to vapour state from a solid state, it does not convert into liquid. 

  

Setup to show Ammonium chloride undergoes sublimation

15. What is distillation and fractional distillation? What is the basic property that separates the two methods? 

Ans: The process of distillation is used for separating the components of a  mixture containing two liquids, having different boiling points and both liquids boil without decomposition. 

The process of fractional distillation is used for separating the components of a  mixture containing more than two liquids having a boiling point difference of less than 25 K. 

The basic property that separates these two methods is: 

Using distillation we can separate only those components which have a  significant difference in their boiling points. While fraction distillation is used when the difference in boiling points is less.

Many students don’t have a strong core knowledge on the subject of science and face difficulty in understanding the basics of the chapters. Due to which they lose a lot of marks in the final exams. To avoid these, students need to formulate a better preparation plan where they should give more emphasis to the practice of class 9th science chapter 1 important questions. Regular practice will help them to improve and be more confident about their own knowledge.

The questions that are included in chapter 1 science class 9 important questions are most likely to come in the exams. Thus, preparing the students better and efficient. Students can download the pdf of class 9 chapter 1 science important questions from the Vedantu site. This pdf is available for free. After downloading the pdf, students can refer to it at every stage of their preparation.

Important Question of Science Class 9 Chapter 1

Students will learn a lot of things from the chapter 'matters in our surroundings, let's discuss some of those things:

The matter is considered as a substance from which our cosmos is made of. Any substance with some mass, that takes volume and which can get comprehended by the senses is termed as a matter. There are a lot of exceptions in this case such as heat, light energy, electrical energy, sound energy, magnetism, vacuum, and shadow. This all is not considered a matter because they don't have mass and they don't take any place.

The substance 'matter' is believed to be composed of small constituent parts. Matters have minimal and minute units. Taking a glance on them is very difficult even with a high-power microscope.

To understand more simply, everything around you is made up of matter. Atoms and compounds of everything are made with small parts of matter. These atoms are responsible for building the things that we see and touch every day.

Characteristics of Matter

The different characteristics of matter are listed below:

The matter is a substance which is made up of small particles.

It is believed that the particles consist of intermolecular spaces between them.

The particles in the matter have a locomotive nature due to the kinetic energy inside them. When there is a surge in the temperature, the motion of particles intensifies.

The bits in the matter attract each other, but this reciprocal force of full becomes operational only when the particles are very close to each other. In solids, the particles are firmly held, which is why it is believed that they have a superior force of attraction. Whereas in gases, particles are loosely held; thus, they have a minimal force of attraction.

Nature of Matter

Depending upon the physical state of different materials or substances, the nature of matter is classified into three categories:

Solids are substances where the particles are held very close to each other due to a strong intermolecular force. The particles are so tightly held at their place that they can have only vibratory motions and nothing else. As the particles are tightly held, therefore solids have a definite shape and definite volume. Some examples of solids are wood, iron, glass, etc. Students while practising important question of science class 9 chapter 1 will learn more about this substance and that too in a straightforward way.

Those substances where the intermolecular forces are weak enough to allow the movement of particles are generally known as liquids. These particles are also closely held with each other, but they have more freedom of movement than the particles of solid. Liquids are substances with a definite volume but with no definite shape. These substances generally take the shape of the container in which they are stored. Some examples of liquid substances are milk, water, etc. To gain more detailed knowledge on this particular substance, students have to continue practising ch 1 science class 9 important questions without fail.

These types of substances have very weak intermolecular forces between their particles or molecules, so the molecules have the freedom to move. The distance between each particle in a gas is bigger if compared to the distance between particles in solids and gases. Gases do not have a fixed shape or a definite volume. These substances fully occupy the containers in which they are stored. Some examples of gases are air, hydrogen, oxygen, methane, etc. By practising important questions for class 9 science chapter 1 regularly, students can gain more knowledge on this particular substance.

These above three states of matter can be transformed from one form to the other just by changing the environment's temperature and pressure conditions. The composition of matter is also used to determine its nature. If a matter is composed of more than one particle, then it is considered as a mixture, but when it contains only one particle, then it is termed as a pure substance. Mixtures are further classified into homogeneous and heterogeneous categories. Pure substances can also get divided into elements and compounds.

All the information that you have read till now are some basics of the chapter 'Matter in our surroundings. But there is more to this chapter, and things will get complicated after getting inside the different topics of the chapter. Students find the theories of this chapter complicated and thus are incapable of scoring good marks, but by practising class 9 science chapter 1 important questions regularly, students can avoid fewer marks.

Matter in Our Surroundings Class 9 Important Questions

Some of the important questions that the students might face in the exams are as follows:

Mention the technique which is used for separating the substances from the mixture.

What is the difference between a homogeneous mixture and a heterogeneous mixture?

What do you understand by the term Matter?

State the different characteristics of matter.

What is the nature of matter? Explain in a brief way.

State the points which show that a physical Change is different from a chemical change.

What are the reasons which cause a matter to change its state from one form to another?

What do you understand by the term element?

What do we call a mixture of salt and sugar in our regular lives?

State the three states of matter based on the distance between the molecules.

State the process using which the seawater can get purified.

What are the properties of a solid?

State the properties of a liquid.

Mention the properties of a gas.

Which state of matter is related to Boyle's law.

CBSE Class 9 Chapter 1 MCQs

1. Due to which among the following phenomena, the water kept in the earthen pot becomes cool during summers?

Transpiration

Evaporation

2.  Which of the following conditions will increase the evaporation of water?

Increase in temperature of the water

Decrease in temperature of the water

Less exposed surface area of water

Adding common salt to the water

3. Which of the following is the boiling point of water at sea level?

Answers: 1 (d), 2 (a) and 3 (c)

Benefits of Class 9th Science Chapter 1 Important Questions

Students who are facing problems in chapter 1 of class 9 are suggested to practice important questions of ch 1 science class 9 so that they can take advantage of this and prepare well. Some of the benefits of this list of questions are:

The questions are taken keeping in mind the syllabus and the format imposed by the CBSE board for class 9 students because any deviations from that can cost students a lot of marks.

The questions are selected under the guidance of some expert teachers who have years of experience in this field. They select questions according to the intellectual capability of the students.

The questions included in the list of chapter 1 science class 9 important questions are most likely to come in the exams, thus making students' preparation better and efficient.

The questions are given with solutions which are explained in a detailed manner.

Important Related Links for CBSE Class 9 

Conclusion .

In conclusion, the availability of important questions for CBSE Class 9 Science Matter in Our Surroundings is a valuable resource for students preparing for their examinations. These important questions cover key topics and concepts related to the chapter, helping students deepen their understanding of the properties of matter, changes of state, and the behavior of particles. Practicing some important questions, students can enhance their knowledge and improve their problem-solving skills. These questions encourage critical thinking and application of scientific principles, preparing students to answer exam questions effectively.

Engaging with these important questions enables students to consolidate their understanding of the chapter, identify areas where they need further clarification, and strengthen their grasp of the subject. They also serve as a valuable revision tool, helping students review and reinforce the concepts they have learned.

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FAQs on Important Questions for CBSE Class 9 Science Matter in Our Surroundings 2024-25

1. Where can I find extra questions for CBSE Class 9 Science Chapter 1- Matter in Our Surroundings?

There are several e-learning sites that provide more practice questions. On Vedantu, you may find the most frequently asked questions for each scientific chapter. Vedantu is a leading learning portal that offers all of the required exam preparation materials such as example papers, NCERT Answers, crucial questions, revision notes, and so on. Important questions for Chapter 1- Matter in Our Surroundings and other chapters, as well as solutions, are available on Vedantu's website for Class 9 CBSE students. Subject matter experts with sufficient expertise and experience in the topic prepare the replies. The key CBSE Class 9 Science Chapter 1 questions have been prepared in a PDF file for students to practice before examinations.

2. What are the two recently discovered states of matter?

Apart from the three-commonly known states of matter, there exist other two states of matter which are much talked about: Plasma and Bose-Einstein Condensate. 

Plasma: Plasma state is the 4th state of matter which is an ionized gas. Plasma neither has a definite volume nor a definite shape. It can be defined as a gaseous substance into which sufficient energy is provided to free electrons from atoms or molecules and to allow both species i.e. ions or electrons to co-exist. Examples of plasma are Stars, lightning, etc. Plasma is also present inside the fluorescent lights.

Bose-Einstein Condensate:   Bose-Einstein Condensate (BEC) is a state of matter of a dilute gas of bosons (a boson is a particle that follows Bose-Einstein Statistics) cooled to a temperature very close to absolute zero. In simple words, BEC is formed by cooling a gas of extremely low density.

3. Can matter exist in all three states?

Indeed, materials may exist in all three states at the same time. At differing temperature and pressure circumstances, the three states of matter interconvert. In other words, pressure and temperature determine the state of a substance, i.e. whether it is solid, liquid, or gas. As water boils, it turns into vapour, and when it freezes at its freezing point, it turns into ice. It is critical to realise that the difference between different states of matter is caused by the location of component particles. As a result, these particles' characteristics can alter as a result of temperature and pressure.

4. What is the difference between boiling and evaporation?

Boiling is a bulk phenomenon whereas evaporation is a surface phenomenon. Particles from the bulk of the liquid change into vapour state in the process of boiling. However, in the process of evaporation, particles from the surface change into the vapour state by gaining enough energy from the atmosphere that weakens the force of attraction present into the liquid to change it into vapour form.

5. What is the significance of using Vedantu’s Important Questions for studying Chapter 1 Matter in Our Surroundings of Class 9 Science?

Every crucial question from the Chapter- Matter in our Surroundings has been hand-picked by Vedantu's expert pros. Vedantu's Crucial Questions for Chapter 1 Matter in Our Surroundings of Class 9 Science has around 50 critical questions from the course. In tests, these questions are worth one to five points. Working through these questions will give you with the necessary chapter revision. It will also assist you in understanding how to develop optimal replies for various exam questions.

6. What are some important questions from Chapter 1 Matter in Our Surroundings of Class 9 Science for exams?

Matter in Our Surroundings contains many important experiments, definitions, and reasoning questions that can be asked in the exams. Some of the examples of these questions are as follows:

Enlist the characteristics of particles of matter.

Suggest a method to liquefy gases.

Why is it that on increasing the wind speed the rate of evaporation increases?

Define latent heat of vaporization and latent heat of fusion.

For over 50 such important questions from this chapter, visit Vedantu .

7. Are the important questions for Chapter 1 Matter in Our Surroundings of Class 9 Science accessible offline?

Yes, the important questions for Chapter 1 Matter in Our Surroundings of Class 9 Science are easily accessible offline by downloading its PDF file in the following simple steps.

Visit Vedantu and choose the subject and the chapter you want. 

On the subsequent page, scroll down and look for the option to "Download PDF."

This will redirect you to a new page containing the link to download the required PDF promptly.

For an even smoother download process, install the Vedantu mobile app and access all the content easily from your phone.

8. How can you show that one crystal of potassium permanganate contains millions of tiny particles?

Dissolve two or three crystals of potassium permanganate and dissolve them in 100 ml of water. Take 10 ml of this solution and put it in another container with 90 ml of water. Take 10 ml of this new solution and again dissolve it in 90 ml of water. Dilute the solution six to eight times. You will find that water still remains coloured after much dilution. This proves that one crystal of potassium permanganate must contain millions of tiny particles that keep on dividing in the water.

9. How can evaporation cause cooling? Give examples.

As a liquid evaporates, its particles collect energy from the surrounding environment in order to recoup the energy lost during evaporation. As energy is taken from the surroundings, the surroundings get colder. In the summer, for example, people sprinkle water over the roofs of buildings to keep them cool. Our body's sweating system functions similarly. As we perspire on a hot day, our perspiration evaporates, which helps to lower our body temperature.

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Matter in Our Surrounding Class 9 MCQ Test (Online Available)

Free mcq test, table of content, matter in our surrounding test - 33.

Duration: 10 Mins

Maximum Marks: 10

Read the following instructions carefully.

1. The test contains 10 total questions.

2. Each question has 4 options out of which only one is correct .

3. You have to finish the test in 10 minutes.

4. You will be awarded 1 mark for each correct answer.

5. You can view your Score & Rank after submitting the test.

6. Check detailed Solution with explanation after submitting the test.

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Matter in Our Surrounding Class 9 MCQ Online

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How to Attempt the Matter in Our Surrounding Class 9 MCQ?

Students need to follow some given steps to attempt the Matter in Our Surrounding Class 9 MCQ, steps are discussed below: 

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  • Click Science from the list of subjects.
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  • Again a new page will appear and one can easily start the test. 

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  • Instructions are Given: Some instructions are given, these guidelines need to be followed and taken care of while solving the MCQ of Matter in Our Surrounding. 
  • Solutions are Given: In the MCQ Matter in Our Surrounding, solutions are given so that students can refer to whenever they need any help in solving objective questions.  
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One of the prominent reasons of solving the Matter in Our Surrounding Class 9 MCQ is that by looking through the options, students can recollect the facts and important concepts, this is one of the important benefit, other benefits are: 

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  • After Completing the Chapter: It is generally recommended for students to start solving the Matter in Our Surrounding MCQ as soon as they complete the chapter accordingly they can reinforce their understanding for the chapter. 
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  • Practise Different Levels of Questions: Students need to practise different levels of multiple choice questions of Matter in Our Surrounding: easy, moderate, advance so that they can understand weak parts and work accordingly. 
  • Note Down the Mistakes: It is a must for students to note down the mistakes made while attempting the Class 9 Matter in Our Surrounding MCQ so that they can easily rectify the mistakes. 

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NCERT Exemplar Class 9 Science Solutions for Chapter 1 - Matter in Our Surroundings

Ncert exemplar solutions class 9 science chapter 1 – free pdf download.

The NCERT Exemplar Solution for Class 9 Science Chapter 1 Matter in Our Surrounding is provided here for the benefit of the students. Studying the NCERT Exemplar Solution will give you in-depth knowledge of the concepts discussed in the chapter. NCERT Exemplar questions are designed in such a way that students can learn all the basic and advanced concepts of the chapter – Matter in Our Surroundings – in a better and easy way.

This Exemplar Solution has answers to questions provided in the NCERT Exemplar Class 9 Science book. It has 10 multiple choice questions, 12 short answer questions and 5 long answer questions of varied difficulty, which will help you to face the exam confidently. To get good marks in the Class 9 examination and to lay a strong foundation for the topics to be studied in future, students are advised to refer to the NCERT Exemplar .

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Access Answers to the NCERT Exemplar for Class 9 Science Chapter 1 – Matter in Our Surroundings

Multiple choice questions.

1. Which one of the following sets of phenomena would increase on raising the temperature?

(a) Diffusion, evaporation, compression of gases

(b) Evaporation, compression of gases, solubility

(c) Evaporation, diffusion, expansion of gases

(d) Evaporation, solubility, diffusion, compression of gases

Answer is c) Evaporation, diffusion and expansion of gases

Explanation:

Particles of matter are continuously moving as they possess kinetic energy. When temperature is raised particles of matter intermix with each other which is called diffusion.

Evaporation means conversion of liquid state into vapour state. When we increase temperature molecules move and vibrate so quickly that they escape into the atmosphere in the form of vapours.

Increase in temperature causes the molecules to move faster, which results in expansion of gases.

2. Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions

(a) Low temperature, low pressure

(b) High temperature, low pressure

(c) Low temperature, high pressure

(d) High temperature, high pressure

Answer is c) Low temperature, high pressure

To compress gas into liquid, low temperature and high pressure are required. Between the particles of gas there is a lot of space. On applying pressure, particles get closer and they start attracting each other to form a liquid. A lot of heat is generated when gas is compresses hence it is necessary to cool it. Cooling lowers the temperature of compressed gas and helps in liquefying it.

3. The property to flow is unique to fluids. Which one of the following statements is correct?

(a) Only gases behave like fluids

(b) Gases and solids behave like fluids

(c) Gases and liquids behave like fluids

(d) Only liquids are fluids

Answer is c) Gases and liquids behave like fluids

In gases and liquids intermolecular force of attraction between the particles is less and they facilitate flow of these states of matter.

4. During summer, water kept in an earthen pot becomes cool because of the phenomenon of

(a) diffusion

(b) transpiration

(c) osmosis

(d) evaporation

Answer is d) evaporation

Evaporation of water through pores of earthen pot reduces temperature of immediate surroundings. This makes the water cool after some time.

Movement of water through plants and evaporation through its aerial parts is called transpiration.

Diffusion is the movement of a substance from an area of higher concentration to an area of lower concentration

If molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, it is called osmosis.

5. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?

(a) Water, air, wind

(b) Air, sugar, oil

(c) Oxygen, water, sugar

(d) Salt, juice, air

Answer is c) Oxygen, water, sugar

The intermolecular force of attraction is less in gases than liquid and solid. Solids have higher intermolecular attraction compared to liquid. In the answer, oxygen is a gas which has lesser intermolecular attraction than water-a liquid and sugar- a crystalline solid.

6. On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be

(a) 298 K, 311 K and 339 K

(b) 298 K, 300 K and 338 K

(c) 273 K, 278 K and 543 K

(d) 298 K, 310 K and 338 K

Answer is a) 298 K, 311 K and 339 K

Add 273 to respective temperature to get the temperature in kelvin. 25°-298K, 38°-311K, 66°-339K

7. Choose the correct statement of the following

(a) Conversion of solid into vapours without passing through the liquid state is called sublimation.

(b) Conversion of vapours into solid without passing through the liquid state is called vaporisation.

(c) Conversion of vapours into solid without passing through the liquid state is called freezing.

(d) Conversion of solid into liquid is called sublimation.

Answer is a) Conversion of solid into vapours without passing through the liquid state is called sublimation.

  • Sublimation is a process in which a solid is converted into vapours without passing through a liquid state.
  • Vaporisation is a phase transition from liquid to vapours.
  • Conversion of liquid to solid at substance’s freezing temperature is called as freezing.

8. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale?

(a) 306 K, 329 K, 391 K

(b) 308 K, 329 K, 392 K

(c) 308 K, 329 K, 391 K

(d) 329 K, 392 K, 308 K

Answer is c) 308 K, 329 K, 391 K

The temperature in Celsius can be converted into temperature in kelvin by adding 273 to the Celsius value. Boiling points of diethyl ether, acetone and n-butyl alcohol are 308 K, 329 K, and 391 K, respectively.

9. Which condition out of the following will increase the evaporation of water?

(a) Increase in temperature of water

(b) Decrease in temperature of water

(c) Less exposed surface area of water

(d) Adding common salt to water

Answer is a) Increase in temperature of water

Increase in temperature of water increases the kinetic energy of the water which will make more particles to attain enough energy to convert into the vapour state. This is how an increase in temperature favours evaporation.

On the other hand, the exposed surface is also responsible for the evaporation. Higher the exposed surface, higher will be the evaporation.

When common salt is added to water then the surface is occupied by the solvent as well as non-volatile solute particles.

This makes the escaping tendency of solvent particles decrease and thus the evaporation of water decreases. Hence options (b), (c) and (d) will decrease the evaporation of water.

10. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

(i) Increasing pressure on hydrogen contained in a closed container

(ii) Some hydrogen gas leaking out of the container

(iii) Increasing the volume of the container of hydrogen gas

(iv) Adding more hydrogen gas to the container without increasing the volume of the container

(a) (i) and (iii)

(b) (i) and (iv)

(c) (ii) and (iii)

(d) (ii) and (iv)

Answer is c) ii and iii

Explanation

  • To increase the intermolecular interaction either volume of Hydrogen gas should be reduced or container volume should be increase.
  • By increasing the pressure or by adding Hydrogen without increasing container volume inter-molecular interaction would decrease.
  • Water under study was found to boil at 102°C at normal temperature and pressure.

Short Answer Questions

11. A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.

The boiling point of pure water is 100 °C and the melting point is 0°C at 1 atmospheric pressure. Here the water boils at 102 °C hence it is not pure water and freezes at a temperature below 0°C.

12. A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following (Fig. 1.1) would correctly represent the result? Justify your choice.

temperatur with respect to time

Answer is d) because at the start of the experiment temperature of the mixture would be zero as water and ice will be in equilibrium. When students start heating initially latent heat will be utilised to melt the ice. Hence the temperature did not increase for a certain amount of time. When students heat the mixture further the temperature of the water increases gradually.

13. Fill in the blanks:

(a) Evaporation of a liquid at room temperature leads to a——— effect.

(b) At room temperature the forces of attraction between the particles of solid substances are———than those which exist in the gaseous state.

(c) The arrangement of particles is less ordered in the ——— state. However, there is no order in the ——— state.

(d) ——— is the change of solid state directly to vapour state without going through the ———state.

(e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called———.

  • Liquid, gaseous
  • Sublimation, liquid
  • Evaporation

14. Match the physical quantities given in column A to their S I units given in column B:

(a) — (iii) The SI unit of pressure is the pascal (denoted by P).

(b) — (iv) The SI unit of temperature is -Kelvin (denoted by K).

(c) — (v) The SI unit of density is kilogram per cubic metre (kg/m 3 ).

(d) — (ii) The SI unit of mass is the kilogram (kg).

(e) — (i) The SI unit of volume is m 3 .

15. The non-SI and SI units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:

(a) — (iv) Degree Celsius and kelvin are the units of temperature.

(b) — (iii) Centimetre and metre are the units of length.

(c) — (v) Gram per centimetre cube and kilogram per metre cube are the units of density.

(d) — (ii) Bar and pascal are the units of pressure.

(e) – (i) Milligram and kilogram are the units of mass.

16. ‘Osmosis is a special kind of diffusion’. Comment.

Diffusion in liquids and gases is the movement of particles from high concentration to low concentration. Osmosis is the movement of particles from the low concentration to high concentration through a semi-permeable membrane. This movement happens due to diffusion. Hence, osmosis is a special kind of diffusion.

17. Classify the following into osmosis/diffusion

(a) Swelling up of a raisin on keeping in water.

(b) Spreading of virus on sneezing.

(c) Earthworm dying on coming in contact with common salt.

(d) Shrinking of grapes kept in thick sugar syrup.

(e) Preserving pickles in salt.

(f) Spreading of smell of cake being baked throughout the house.

(g) Aquatic animals using oxygen dissolved in water during respiration

b) Diffusion

f) Diffusion

a) Swelling up of a raisin on keeping in water is osmosis because the concentration of solutes is more outside. Hence, water moves water from higher to lower concentrations through a semipermeable membrane, causing the raisin to swell.

b) Spreading the virus through sneezing is diffusion because the virus enters the air in tiny droplets. They remain suspended for a long time and move here and there in the air from higher to lower concentrations.

c) Earthworms die on coming in contact with common salt is osmosis because of variations in the concentration of water and solute. When salt is sprinkled on them, their skin gets dried, due to which their body shrinks, and they die.

d) The shrinking of grapes in thick sugar syrup is Osmosis because water will move down from higher to lower concentrations via a semipermeable membrane.

e) The Preserving of pickles in salt is Osmosis because salt helps to remove water from the cells and helps to preserve pickles.

f) The spreading of the smell of cake being baked throughout the house is Diffusion because the particles of cake move from a region of higher concentration to lower concentration through diffusion hence, producing the smell.

g) Aquatic animals using oxygen dissolved in water during respiration is osmosis because fish absorb oxygen from water (high concentration) through gills and skin (semipermeable membrane) to the lower concentration.

18. Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.

Water as steam has more latent heat as compared to water as solid and liquid. Hence it causes severe burns while water as ice causes a cooling effect.

19. Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment.

Steam and the temperature of water boiling in the kettle is the same. But the particles of steam have more energy in the form of latent heat of vaporisation than the particles of water. This energy is released when the steam condenses to water. Therefore, steam is hotter than boiling water.

20. A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.1.2) would correctly represent the change in its temperature as a function of time.

temperature with respect to time

Graph (a) is the right answer because water will cool initially until its temperature reaches 0 °C. After reaching the freezing point (0 °C) temperature will remain constant until the water becomes ice. After that point temperature would decrease again.

21. Look at Fig. 1.3 and suggest in which of the vessels A,B, C or D the rate of evaporation will be the highest? Explain.

rate of evaporation

Answer is C because evaporation increases with an increase in the surface area. With an increase in wind speed particles of water vapour will move away hence the rate of evaporation will be the highest.

(a) Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.

(b) Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?

used to denote the conversion of vapour to solid.

a) A deposition is the term used to denote the conversion of vapour to solid.

b) The amount of heat energy released or absorbed when a solid change to liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.

Long Answer Questions

23. You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well-labelled diagram.

Naphthalene is a non-polar compound which will not dissolve in water. Similarly, ammonium chloride is a polar compound which is soluble in water. Naphthalene is volatile in room temperature whereas ammonium chloride is volatile at high temperature.

The mixture of Naphthalene and ammonium chloride can be separated by decantation of aqueous mixture. Naphthalene remains undissolved in water and can be taken out in a funnel. The filtrate of ammonium chloride can be evaporated to obtain dry ammonium chloride.

filtration

24. It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why?

Hot summer leads to a lot of sweating. Cotton absorbs moisture whereas Nylon will not absorb the moisture as efficiently as cotton does. Hence cotton absorbs the sweat faster that Nylon does. Evaporation of moisture from the cotton cloth will give a cool feeling, especially when the wind blows. Hence, it can be concluded that Priyanshi will be more comfortable in summer days.

25. You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?

Drying of clothes is due to the process of evaporation hence the following steps should be taken to dry the shirt faster.

  • Dry the shirt under a fan with high speed. With an increase in the speed of fan, water vapours will move away. This decreases water vapour in the surroundings which will increase the evaporation and the shirt gets dried faster.
  • Spread the shirt on a hanger which will increase surface area. Increase in the surface area makes the shirt dry quickly.
  • Dry the shirt in sunlight. Because of high-temperature water evaporates faster. Thus the shirt gets dried easily.
  • Iron the shirt. Heat increases the speed of vaporization and evaporation. This dries the shirt faster.

26. Comment on the following statements:

(a) Evaporation produces cooling.

(b) Rate of evaporation of an aqueous solution decreases with increase in humidity.

(c) Sponge though compressible, is a solid.

a) When a liquid evaporates it takes latent heat from the object it touches. This will make the object cooler. Hence evaporation causes cooling.

b) When there is an increase in the humidity water vapour in the atmosphere will be more. Hence the atmosphere will not take water vapours easily which decreases the process of evaporation.

c) Sponge is a solid because it has definite shape and volume which does not change until you press it. It has minute pores in which air is filled. When you press it, air passes out through pores this makes it a compressible solid.

27. Why does the temperature of a substance remain constant during its melting point or boiling point?

The temperature of a substance remains constant during melting and boiling points till the completion of melting and boiling because of the latent heat of fusion used by the substances. Latent heat of fusion helps to overcome the force of attraction between particles of solid to change into a liquid when they melt. Hence temperature remains constant.

In the same way during the formation of vapours, latent heat helps solid substance to convert into a gaseous state. Hence temperature of a substance remains constant at boiling point.

Important Concepts of the NCERT Exemplar Class 9 Science Matter in Our Surroundings

  • Physical nature of matter
  • The matter is made up of particles
  • How small are these particles of matter?
  • Particles of matter are continuously moving
  • Characteristics of particles of matter
  • Particles of matter have space between them
  • Particles of matter attract each other
  • States of matter
  • The liquid state
  • The solid state
  • The gaseous state
  • Can matter change its state?
  • Effect of change of temperature
  • Effect of change of pressure
  • Factors affecting evaporation
  • How does evaporation cause cooling?

Students who study using the exemplar can prepare well and score excellent marks in examinations. For additional study materials, NCERT Solutions , sample papers and notes of all the subjects and classes, visit BYJU’S website or download BYJU’S – The Learning App.

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Frequently Asked Questions on NCERT Exemplar Solutions for Class 9 Science Chapter 1

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NCERT Solutions Class 9 Science - Chapter 1 Matter in our surroundings - PDF Download

case study on chapter 1 class 9 science

NCERT Solutions for class 9 science chapter 1 Matter in our surroundings is an essential study material from the point of view of your class 9 science examination. The detailed NCERT solutions for class 9 science chapter 1 will help you to understand the basic concepts taught in this chapter.

The concept of matter is an essential concept in science. It forms the foundation for topics taught in subsequent classes. For more information, please refer to NCERT solutions for Class 9 science chapter 1 – Matter in our surroundings by eSaral. The NCERT solutions are prepared by dedicated teachers of eSaral with a deep conceptual understanding and many years of experience. They have well-structured content to make it easier for students to understand and learn. 

NCERT Solutions for Class 9 Science Chapter 1 Topics

1.1 Physical Nature of Matter: The physical nature of matter includes the fundamental characteristics of matter and its behavior under various conditions.

Subtopics covered in the section 1.1 Physical Nature of Matter:

    1.1.1 matter is made up of particles

    1.1.2 how small are these particles of matter?

1.2 Characteristics of Particles of Matter: The characteristics of matter particles play a fundamental role in determining the properties and behavior of various substances.

Subtopics covered in the section 1.2 Characteristics of Particles of Matter:

    1.2.1 Particles of matter have space between them

    1.2.2 Particles of matter are continuously moving

    1.2.3 particles of matter attract each other

1.3 States of Matter: The three states are solid, liquid, and gas. In a solid, the particles are tightly packed in a uniform pattern and vibrate in place. They do not move freely around each other. In a liquid, the particles are still tightly packed, but they move around each other freely. The liquid takes on the shape of its container. In a gas, the particles are dispersed and move in all directions. Gas particles have the highest kinetic energy of the three states.

Subtopics covered in the section 1.3 States of Matter:

    1.3.1 The solid state

    1.3.2 The liquid state

    1.3.3 The gaseous state

1.4 Can Matter Change its State?: The state of matter can be altered by temperature and pressure. There are three fundamental states of matter: solid, liquid and gas. Matter can transition between these states through different processes.

Subtopics covered in the section 1.4 Can Matter Change its State?: 

    1.4.1 effect of change of temperature

    1.4.2 effect of change of pressure

1.5 Evaporation: Evaporation is the transformation of a liquid into a gas or vapour at its surface, including at temperatures below the boiling point of the liquid. The process of evaporation is a phase transition caused by the kinetic energy of the particles present in the liquid.

Subtopics covered in the section 1.5 Evaporation: 

     1.5.1 Factors Affecting Evaporation

     1.5.2 How Does Evaporation Cause Cooling?

Key Features of Class 9 Science Chapter 1

Small particles make up matter. 

There are three types of matter: solid, liquid, and gas. 

Forces of attraction between particles are highest in solids, lowest in liquids, and highest in gases. 

The space between the component particles and kinetic energy of the particles is minimal in solids, intermediate, and highest in liquids and gases.

In the case of solids, the arrangement of the particles is most orderly

However, in liquids, the layers of particles may slip and slide over each other. In the case of gases, the arrangement is not orderly, with particles moving around randomly. 

The states of the matter are interconvertible, and can be altered by changes in temperature or pressure, with sublimation being the direct transfer of the solid state to the gas state without the need to go through liquid state, and deposition being the transfer of the gas state directly to the solid state without the need for liquid state. 

Boiling is also a bulk phenomenon, with particles from the bulk of the liquid changing into vapour.

Evaporation is an example of a surface phenomenon, where particles from the surface of the liquid are able to overcome the attraction present in the liquid, resulting in the transformation into vapour.

Benefits of Downloading the PDF of NCERT Solutions Class 9 Science Chapter 1 Matter in Our Surroundings

Downloading PDFs of NCERT solutions for class 9 science chapter 1 “Matter in our surroundings” can provide specific advantages based on the features of eSaral. Here are some of the advantages of downloading NCERT Solutions for class 9 science.

Expertly crafted solutions: eSaral offer solutions that are carefully curated by educators and subject experts to ensure high-quality and correct explanations.

Easy access: The PDF of the NCERT Solutions is readily available on your device for quick and easy access whenever you need it. This way, you can study them anytime, anywhere without having to be connected to the internet.

Comprehensive understanding: The solutions provide detailed explanations of each question and topic in the chapter, helping students to fully understand the topic and improve their understanding of it.

Step-by-step learning: The solution is presented in a structured way, allowing students to follow and learn step-by-step. This is especially useful for complex topics and concepts.

Visual clarity: The solution often includes diagrams, graphs and examples that help students to visualize the concepts in the chapter, making them easier to understand.

Exam preparation: NCERT solutions are designed to help students prepare for exams and exam patterns by aligning them with the curriculum.

Self-assessment: Once students have tried the questions in the chapter, they can use the solution to check their answers and evaluate their performance, helping them to identify areas that need more practice and focus.

Frequently Asked Questions

Question 1: What are the three states of matter?

Answer 1: There are three fundamental states of matter: solids, liquids, and gases. These states are defined by the arrangement and motion of particles. 

Question 2: How are the particles arranged in solids, liquids, and gases? 

Answer 2: In solids, the particles are tightly packed and have a fixed position. In liquids, the particles are loose and can move around one another. In gases, the particles are dispersed and move freely.

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    Answer (a) The force of attraction between particles of gas is negligible. Because of this, particles of gas move in all directions. Thus, a gas fills the vessel completely in which it is kept. (b) Particles of gas move randomly in all directions at high speed.As a result, the particles hit each other and also hit the walls of the container with a force.

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    Students can cross check their answers and also whether they learned it properly or not. Chapter 1 of NCERT Solutions Class 9 Science consists of 9 exercise questions and 17 in-text questions. Topics in the Chapter. • Physical Nature of Matter. → Matter is Made Up of Particles.

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    Matter in Our Surroundings Class 9 Extra Questions Hots (Higher Order Thinking Skills) Question 1. The diagram below shows burning of an oil lamp. Draw the arrangement of particles of position 'X' and 'Y' when the lamp is burning. Question 2. 'A small volume of water in a kettle can fill a kitchen with steam'.

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  22. NCERT Solutions Class 9 Science

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