Matter in Our Surroundings

MCQs – VHOTS Level

Chapter: Matter in Our Surroundings

1. Which of the following statements best explains why solids have a definite shape?

A. Solids have high kinetic energy

B. Particles in solids can move freely

C. Interparticle forces are the strongest in solids

D. Solids have no intermolecular spaces

2. Dry ice is used to create fog in stage shows because it:

A. Freezes the air

B. Burns oxygen

C. Sublimes to form dense gas

D. Absorbs moisture

3. Why does a balloon expand when heated?

A. Gas particles stop moving

B. Gas particles come closer

C. Kinetic energy of gas particles increases

D. Volume decreases

4. When a substance changes from liquid to gas at all temperatures, it is called:

A. Condensation

B. Boiling

C. Evaporation

D. Sublimation

5. Evaporation causes cooling because:

A. Temperature increases during evaporation

B. Heat is absorbed from surroundings

C. Air is cold

D. Surface becomes hot

6. Why does perfume spread faster in a warm room than in a cold room?

A. Perfume evaporates slower

B. Particles are lighter

C. Particles move faster due to more kinetic energy

D. Air is heavier

7. Which factor does not affect the rate of evaporation?

A. Surface area

B. Humidity

C. Wind speed

D. Color of the liquid

8. A solid directly changing into gas is an example of:

A. Freezing

B. Melting

C. Condensation

D. Sublimation

9. Which state of matter has the least interparticle attraction?

A. Solid

B. Liquid

C. Gas

D. Plasma

10. Boiling occurs when:

A. Room temperature equals vapor pressure

B. Vapor pressure equals atmospheric pressure

C. Temperature falls

D. Surface area decreases

11. Why does an earthen pot keep water cool?

A. It absorbs sunlight

B. Due to condensation

C. Due to evaporation from its porous surface

D. It has low specific heat

12. Which of these shows diffusion most rapidly?

A. Solid in solid

B. Liquid in liquid

C. Gas in gas

D. Solid in liquid

13. Why are gases compressible but solids are not?

A. Gases are lighter

B. Solids have more space

C. Gases have negligible intermolecular force and large space between particles

D. Solids can move freely

14. Which change of state involves latent heat of fusion?

A. Liquid to gas

B. Solid to liquid

C. Gas to liquid

D. Gas to solid

15. Which phenomenon shows that particles of matter are in constant motion?

A. Compression of gas

B. Evaporation

C. Diffusion

D. Boiling

16. Which state of matter can be easily compressed?

A. Solid

B. Liquid

C. Gas

D. None of these

17. At what temperature does water boil at sea level?

A. 0°C

B. 50°C

C. 100°C

D. 212°C

18. What happens to the boiling point of water at higher altitudes?

A. Increases

B. Decreases

C. Remains same

D. Doubles

19. The smell of hot food reaches us faster than cold food due to:

A. Faster convection

B. Faster diffusion at higher temperatures

C. Strong aroma

D. More nutrients

20. Which of these processes does NOT involve a change in temperature?

A. Melting

B. Freezing

C. Condensation

D. Boiling (until complete)

 20 Very High Order Thinking Skill (VHOTS) MCQs from Chapter: Matter in Our Surroundings with correct answers:

VHOTS MCQs with Answers

Class 9 – Science Chapter: Matter in Our Surroundings

1. Which of the following statements best explains why solids have a definite shape?

C. Interparticle forces are the strongest in solids

2. Dry ice is used to create fog in stage shows because it:

C. Sublimes to form dense gas

3. Why does a balloon expand when heated?

C. Kinetic energy of gas particles increases

4. When a substance changes from liquid to gas at all temperatures, it is called:

C. Evaporation

5. Evaporation causes cooling because:

B. Heat is absorbed from surroundings

6. Why does perfume spread faster in a warm room than in a cold room?

C. Particles move faster due to more kinetic energy

7. Which factor does not affect the rate of evaporation?

D. Color of the liquid

8. A solid directly changing into gas is an example of:

D. Sublimation

9. Which state of matter has the least interparticle attraction?

C. Gas

10. Boiling occurs when:

B. Vapor pressure equals atmospheric pressure

11. Why does an earthen pot keep water cool?

C. Due to evaporation from its porous surface

12. Which of these shows diffusion most rapidly?

C. Gas in gas

13. Why are gases compressible but solids are not?

C. Gases have negligible intermolecular force and large space between particles

14. Which change of state involves latent heat of fusion?

B. Solid to liquid

15. Which phenomenon shows that particles of matter are in constant motion?

C. Diffusion

16. Which state of matter can be easily compressed?

C. Gas

17. At what temperature does water boil at sea level?

C. 100°C

18. What happens to the boiling point of water at higher altitudes?

B. Decreases

19. The smell of hot food reaches us faster than cold food due to:

B. Faster diffusion at higher temperatures

20. Which of these processes does NOT involve a change in temperature?

D. Boiling (until complete)