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CBSE Class 9  >  Class 9 Notes  >  Science   >  Matter in Our Surroundings Unit Test Class 9 Science

Matter in Our Surroundings Unit Test Class 9 Science

Time: 1 hour 

M.M. 30 

Attempt all questions. 

Question numbers 1 to 5 carry 1 mark each. 

Question numbers 6 to 8 carry 2 marks each. 

Question numbers 9 to 11 carry 3 marks each. 

Question number 12 & 13 carry 5 marks each

Q1: Which of the following processes involves a direct change from solid to gas without passing through the liquid state? (1 Mark)
(i) Melting
(ii) Boiling
(iii) Sublimation
(iv) Condensation

Q2: Define the term "latent heat of fusion." (1 Mark)

Q3: Which of the following statements is true about gases? (1 Mark)
(i) They have a fixed shape.
(ii) They have a fixed volume.
(iii) They are highly compressible.
(iv) They do not occupy space.

Q4: Fill in the blank: The particles in a gas move _________ than in a solid. (1 Mark)

Q5: Which of the following statements about matter is correct? (1 Mark)
(i) Particles in solids have the highest kinetic energy.
(ii) Gases have a definite shape and volume.
(iii) The density of a substance generally increases as it changes from liquid to solid.
(iv) In a gaseous state, the intermolecular forces are strongest.

Q6: Why is ice at 273 K more effective in cooling than water at the same temperature? (2 Marks)

Q7: State two differences between evaporation and boiling. (2 Marks)

Q8: Why do we feel cool when we apply some acetone or perfume on our palm? (2 Marks)

Q9: What are the characteristics of the particles of matter? (3 Marks)

Q10: How does the temperature and pressure affect the state of matter? (3 Marks)

Q11: Describe the process of sublimation with an example. (3 Marks)

Q12: Explain the effect of change in temperature on the states of matter with suitable examples. (5 Marks)

Q13: Differentiate between the three states of matter in terms of the arrangement of particles, compressibility, and fluidity. (5 Marks)

You can find the solutions of this Unit Test here: ​Unit Test (Solution): Matter in Our Surroundings​​​

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FAQs on Matter in Our Surroundings Unit Test Class 9 Science

1. What are the different states of matter?
Ans. The different states of matter are solid, liquid, gas, and plasma. Solids have a fixed shape and volume, liquids have a fixed volume but take the shape of their container, gases have neither fixed shape nor volume, and plasma is a state where gases are ionized and conduct electricity.
2. How does temperature affect the state of matter?
Ans. Temperature plays a crucial role in determining the state of matter. Increasing temperature can cause solids to melt into liquids, and liquids to evaporate into gases. Conversely, lowering the temperature can cause gases to condense into liquids and liquids to freeze into solids.
3. What is the difference between physical and chemical changes in matter?
Ans. A physical change in matter involves a change in appearance or state without altering the substance's chemical composition, such as melting ice. A chemical change results in the formation of new substances with different properties, such as rust forming on iron.
4. Can matter change from one state to another? If so, how?
Ans. Yes, matter can change from one state to another through processes such as melting (solid to liquid), freezing (liquid to solid), condensation (gas to liquid), and evaporation (liquid to gas). These changes are usually influenced by temperature and pressure.
5. What is the role of particles in understanding the states of matter?
Ans. The states of matter are primarily determined by the arrangement and behavior of particles. In solids, particles are closely packed and vibrate in place, in liquids, they are close but can move past each other, and in gases, they are far apart and move freely. Understanding particle behavior helps explain the characteristics of each state.
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