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

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?

a.) Solid

b.) Liquid

c.) Gas

d.) Both b and c

Answer: d.) Both b and c

ii.) Distance between particles of matter least in

a.) Solid

b.) Liquid

c.) Gas

d.) None of these

iii.) Compressibility is least in case of

a.) Solid

b.) Liquid

c.) Gas

d.) None of these

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

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