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  • Matter in Our Surroundings Class 9 Case Study Questions Science Chapter 1

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Hello students, we are providing case study questions for class 9 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 9 science. In this article, you will find case study questions for cbse class 9 science chapter 1 Matter in Our Surroundings.

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Case Study Questions on Matter in Our Surroundings

Question 1:

The word ‘matter’ refers to everything in the universe that has mass and takes up space. States of matter are generally described on the basis of qualities that can be seen or felt. Three states of matter can be found in daily life: solid, liquid and gas.

Matter that feels hard and maintains a fixed shape is called a solid, matter that feels wet and maintains its volume but not its shape is called a liquid. Matter that can change both shape and volume is called a gas.

Read the given passage carefully and give the answer of the following questions:

Q 1. In which form, do the water molecules have less kinetic energy?

d. All of them have equal kinetic energy

Q2. Which of the following describes the liquid phase?

a. It has a definite shape and a definite volume.

b. It has a definite shape but not definite volume.

c. It has a definite volume but not a definite shape.

d. It has neither a definite shape nor a definite volume.

Q 3. Which one of the following statements is wrong for gases?

a. Gases do not have a definite shape and volume.

b. Volume of the gas is equal to the volume of the container confining the gas.

c. Confined gas exerts uniform pressure on the walls of container in all directions.

d. Mass of the gas cannot be determined by weighing a container in which it is enclosed.

Q 4. ‘Gases are easily compressed but liquids cannot be compressed.’ What can be inferred from this statement?

a. The forces of attraction between gas particles are stronger than that between liquid particles.

b. The gas particles are spaced further apart than liquid particles. c. The gas particles have less energy than liquid particles.

d. The gas particles move more rapidly than liquid particles.

Q 5. As the solid melts to form liquid:

a. interparticle forces of attraction decrease

b. the kinetic energy of particles increases

c. compressibility increases

d. All of the above

Ice (solid) has less kinetic energy as compared to water (liquid) and steam (gas).

2. (c) It has a definite volume but not a definite shape.

3. (d) Mass of the gas cannot be determined by weighing a container in which it is enclosed.

The mass of a gas can be determined by weighing the empty container first, then filling it with gas and again weighing the container filled with gas. The difference of two readings gives the mass of gas.

4. (b) The gas particles are spaced further apart than liquid particles.

The large space between the particles of gas allow the gas to be easily compressed when pressure is applied.

5. (d) All of the above

When a solid is heated, the interparticle force decreases and kinetic energy of the particles increases. Compressibility of liquids is slightly more than solids, hence increase

Case study questions for other chapters of class 9 science is given below.

  • Work and Energy Class 9 Case Study Questions Science Chapter 10
  • Gravitation Class 9 Case Study Questions Science Chapter 9
  • Force and Laws of Motion Class 9 Case Study Questions Science Chapter 8
  • Motion Class 9 Case Study Questions Science Chapter 7
  • Tissues Class 9 Case Study Questions Science Chapter 6

The Fundamental Unit of Life Class 9 Case Study Questions Science Chapter 5

Is matter around us pure class 9 case study questions science chapter 2.

We hope the given case study question

Topics from which case study questions may be asked

  • Matter and its physical properties
  • Characteristics pf particles of mattter
  • States of Matter
  • Scales of Measuring Temperature
  • Evaporation
  • Factors affecting Rate of Evaporation

This chapter deals with the basic understanding of acids, bases, and salts, including their properties, reactions, pH scale, indicators, and practical applications.

Helpful Links for CBSE Class 9 Science Preparation

  • Download Latest Sample Papers for CBSE Class 9 Science
  • Download Worksheets for CBSE Class 9 Science
  • Download Chapter Tests for CBSE Class 9 Science
  • Download Case Study Question Bank for CBSE Class 9 Science
  • Download Numerical Problems for CBSE Class 9 Physics
  • Download Important MCQs for CBSE Class 9 Physics

Frequently Asked Questions (FAQs) on Matter in Our Surroundings Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 9 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 9 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on chemical reactions and equations for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on matter in our surroundings class 9 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of acids, bases and salts.

Q7: What is matter made up of?

A7: Matter is made up of particles.

Q8: What happens when salt is added to water?

A8: When we add salt in water, the particles of salt get into the spaces between particles of water. We say that salt has been dissolved into water.

Q9: What happens when we light the incense stick in one corner of a room?

A9: The smell of the incense stick spreads throughout the room due to diffusion

Q10: Which of the following substances diffuses faster in a glass of water: a drop of honey or blue ink?

A10: Blue ink, because of the high kinetic energy of the particles of the given matter. Honey is viscous, and has low kinetic energy.

Q11: Why does diffusion becomes faster on heating?

A11: On heating, the kinetic energy of the particles increases and the particles move faster. This speeds up the intermixing of particles

Q12: Why do the gases exert more pressure on the walls of the container than the solids?

A12: In gases, the particles move randomly at high speed and they collide with each other and with walls of the container. Due to this collision with walls of the container, the gases exert more pressure than solids.

Q13: What happens to the particles of the solid during sublimation?

A13: Sublimation is a process in which the solid changes directly to gas either by decreasing pressure or increasing temperature. A decrease in pressure increases the space between the particles and an increase in temperature increase the kinetic energy of the particles.

Q14: List all the factors which affects the rate of evaporation.

A14: The factors affecting the rate of evaporation are: (a) an increase in surface area (b) an increase in temperature (c) an increase in wind speed (d) a decrease in humidity

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

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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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Monday, August 2, 2021

Case study based questions from is matter around us pure.

CASE STUDY BASED QUESTIONS                                 

Q.1 Read the passage and answer the questions given, one mark questions

Anything that occupies some space, having mass, volume and can be felt by one or more out of five senses is called matter. The purest form of matter is called an element. An element is a substance which cannot be split up into two or more simpler substances by the usual chemical methods of applying heat, light or electric energy.

A pure substance consists of a single type of particles. All the elements and compounds are pure substances because they contain only one kind of particles. eg. Hydrogen, Carbon, Oxygen, Carbon- monoxide, Copper, Gold, Silver. A pure substance has a fixed composition as well as a fixed boiling point and melting point. The presence of impurities generally increases the melting and boiling point of the pure substances

i )  Which of the statement is true about pure substances?

a.     Homogeneous mixtures are pure as they have same composition throughout.

b.     22 carat gold is pure in nature.

c.      Elements are not pure in nature.

d.      Gold is pure in nature.

ii) The boiling point of pure water is 100 o C. What likely be the effect on the boiling point of water if 150 gm NaCl is added to one litre water.

a.       Increases

b.      Decreases

c.       Remain same

d.      Does not effected

Q.2 Read the following and answers the questions .

A homogeneous mixture of two or more substances called a true solution. it consists of solute and solvent. The particle size of true solution in less than 1 nanometer. A suspension is a heterogeneous mixture in which the solute particle does not dissolve but remain suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogeneous but appears to be homogeneous as the particles are uniformly spread throughout the solution.

(i) which one of the following is most stable? 

A)True solution

B)Suspensions

D) both A and B

ii) which type of mixture can be separated by filtration?  

D)All of these

iii) which statement is incorrect about Tyndall effect.  *

A)True solution show Tyndall effect

B)Suspensions show Tyndall effect

C)Colloid show Tyndall effect

D)Both B and C show Tyndall effect

iv) Which is the correct order of stability of solution  *

A) True < Colloid<Suspension

B)Colloid<Suspension<True

C)Colloid<True<Suspension

D)Suspension<Colloid<True

ASSERTION AND REASONING BASED QUESTIONS

Q(3) Assertion :- an element is purest form of matter. 

       Reason --- an element is made up of same kind of atoms  .

(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

(c) If the Assertion is correct but Reason is incorrect.

(d) If both the Assertion and Reason are incorrect.

Q(4)Assertion:- Milk and starch will show tyndall effect. Reason:- particle of milk and starch scatter the beam of light.

     Competency based questions

Q(5)Tincture of iodine has antiseptic properties. This solution is made by dissolving  *

(a) iodine in potassium iodide

b) iodine in oil

(c) iodine in water

(d) iodine in alcohol

Q(6) in which of the following is a mixture -

(a) Sea water

(b)Calcium carbonate

Q(7)identify the dispersed phase and dispersion medium of a given colloid. Colloid - Fog  

Q(8)which type colloidal solution is formed when a liquid present in liquid  ?

   a. Gel

   b. Emulsion

   c. Aerosol

   d. Solid Sol

CRITICAL THINKING AND NUMERICAL BASED QUESTION

Q(9)0.5 gram of salt is dissolved in 25 gram of water. What is the percentage amount of salt in the solution (calculate by using mass by mass percentage formula)  *

©4.00%

I. Read the following and answers and questions.(5)

A homogenous mixture of two or more substances called a true solution. It consists of solute and solvent. The particle size of true solution is less than 1 nanometer. A suspension is a heterogenous mixture in which the solute particle does not dissolve but remain suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogenous but appears to be homogeneous as the particle are uniformly spread throughout the solution.

i). Which one of the following is most stable?

a. True solution

b. Suspension

c. Colloids

d. Both a and b

ii). Which types of mixture can be separated by filtration

d. All of above

  iii) .Which types of effect  shown by solution B

(a)Lustre    (b) sonorous  (c)ductile  (d)Tyndall 

iv).when Shreyanshi  was suffering from fever the Doctor had asked his parents to check his temperature every two hours and also to keep a record. he was a thermometer that has a certain metal in liquid state inside it.generally metals are solid in nature which one of the following metal is found in liquid state at room temperature.

 (a) Na        (b) Al           (c) Hg              (d) Fe                                                                                     

v)Emulsion  solution is a colloidal solution in which the dispersed phase is a…… while the dispersion medium is a……                                                                                                                  (a)Liquid, liquid    (b)Liquid, solid  (c)Solid ,liquid     (d)Liquid ,gas                                                      Q.2 A solution contains 40g of sugar in 320g of water.Calculate the concentration in terms of mass by mass percentage of the solution.     

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