Worksheet class 9

 

Here are 10 MCQs (Multiple Choice Questions) based on the chapter "Matter in Our Surroundings" (Class 9 Science) — without answers:

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1. Which of the following has the maximum kinetic energy?
   (a) Ice at 0°C
   (b) Water at 100°C
   (c) Steam at 100°C
   (d) Water at 0°C

2. The process of changing gas into liquid is known as:
   (a) Sublimation
   (b) Condensation
   (c) Evaporation
   (d) Boiling

3. During evaporation, the particles of a liquid:
   (a) Lose energy
   (b) Gain energy
   (c) Remain unchanged
   (d) Become solid

4. Latent heat of vaporization is the heat energy required to:
   (a) Raise the temperature of water
   (b) Convert liquid to solid
   (c) Change solid to gas
   (d) Convert liquid to gas without temperature change

5. Which of the following is an example of sublimation?
   (a) Melting of ice
   (b) Freezing of water
   (c) Camphor disappearing
   (d) Boiling of milk

6. Which factor does not affect the rate of evaporation?
   (a) Temperature
   (b) Surface area
   (c) Wind speed
   (d) Volume of liquid

7. The interconversion of states of matter can be brought about by changing:
   (a) Shape
   (b) Mass
   (c) Temperature or pressure
   (d) Size of particles

8. Which state of matter has neither definite shape nor definite volume?
   (a) Solid
   (b) Liquid
   (c) Gas
   (d) Plasma

9. On increasing pressure and reducing temperature, a gas can be converted into:
   (a) Solid
   (b) Plasma
   (c) Liquid
   (d) Vapour

10. The melting point of a solid is defined as the temperature at which:
    (a) Solid turns into gas
    (b) Solid turns into liquid
    (c) Liquid turns into gas
    (d) Liquid turns into solid

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Here are the answers to the 10 MCQs based on the chapter "Matter in Our Surroundings":

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1. (c) Steam at 100°C

2. (b) Condensation

3. (b) Gain energy

4. (d) Convert liquid to gas without temperature change

5. (c) Camphor disappearing

6. (d) Volume of liquid

7. (c) Temperature or pressure

8. (c) Gas

9. (c) Liquid

10. (b) Solid turns into liquid

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e MCQs with a higher difficulty level!