Topic 9 – Evaporation Causes Cooling

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🪨 Topic 9 – Evaporation Causes Cooling Quiz

1. Why does evaporation cause cooling?

A. It takes away heat from the surroundings B. It increases heat in surroundings C. It produces ice D. It condenses vapor

2. Why do we feel cool when sweat evaporates from our body?

A. Air becomes cold B. Wind increases body heat C. Heat is taken away from the skin D. The skin starts freezing

3. Why does acetone feel cool on the skin?

A. It is colder than skin B. It evaporates quickly and absorbs heat C. It contains ice particles D. It is made from alcohol

4. What energy is used during evaporation?

A. Chemical energy B. Kinetic energy of vapor C. Sound energy D. Heat from surroundings

5. Why does rubbing alcohol feel cool on the skin?

A. It evaporates and absorbs body heat B. It is naturally cold C. It contains menthol D. It freezes water

6. Why does water in earthen pots remain cool?

A. Pot material is cold B. Pot is kept in the fridge C. Evaporation from the surface cools it D. Pot absorbs sunlight

7. Which condition leads to maximum cooling due to evaporation?

A. High humidity B. Small surface area C. Covered container D. Dry and windy weather

8. What is the purpose of sweating in humans?

A. To cool the body by evaporation B. To reduce hunger C. To store water D. To protect the skin from dust

9. Why do wet clothes dry faster under a fan?

A. Fan cools the air B. Wind increases evaporation rate C. Clothes become lighter D. Clothes shrink

10. Which substance evaporates quickly and gives a cooling effect?

A. Water B. Salt C. Ether D. Vinegar

11. How does evaporation of liquid help in cooling its container?

A. By generating cold air B. By absorbing heat energy from the container C. By freezing water D. By forming a vacuum

12. What is the immediate effect on temperature when evaporation occurs?

A. It increases sharply B. It remains constant C. It decreases D. It becomes zero

13. Why is alcohol used in thermometers for cold regions?

A. It evaporates easily and shows cooling B. It has bright color C. It freezes quickly D. It is cheaper than mercury

14. What happens if ether is dropped on the skin?

A. It heats the skin B. It causes irritation C. It thickens on the skin D. It causes cooling

15. Which molecules escape during evaporation?

A. The heaviest ones B. The coldest ones C. The fastest-moving ones D. The least energetic ones

16. Why does touching spilled petrol feel cold?

A. Petrol is cold in nature B. It evaporates fast and absorbs heat C. It mixes with air D. It contains water vapor

17. Why do clothes feel cold after taking them out from washing?

A. Due to cooling by evaporation B. Due to water pressure C. Because they are cleaner D. Because of detergent

18. What happens to the body's heat when sweat evaporates?

A. It increases B. It stays constant C. It decreases D. It moves to air

19. Which of the following is responsible for cooling in evaporation?

A. Wind B. Dust C. Surface pressure D. Heat absorbed by escaping particles

20. How does a porous clay pot keep water cool?

A. It blocks sunlight B. Water evaporates from outer surface using heat C. Water freezes inside D. It adds cooling powder

21. How does wind help in cooling effect of evaporation?

A. Increases evaporation rate B. Reduces humidity C. Cools down the surface directly D. Provides shade

22. What happens to the temperature of a liquid when it evaporates?

A. It increases quickly B. It remains same C. It falls D. It becomes zero

23. What is the main requirement for evaporation to cause cooling?

A. Boiling B. Freezing point C. Melting D. Heat energy from surroundings

24. What increases the cooling effect of evaporation?

A. Fast evaporation B. Condensation C. Boiling point D. Humidity

25. In which condition will sweat evaporate quickly?

A. Humid and still air B. Cold and rainy C. Hot and dry with breeze D. Cloudy weather

26. What explains the cooling of water kept in a mud pot?

A. Freezing of water B. Reflection of sunlight C. Insulation by pot D. Evaporation of water through pores

27. Which type of liquid gives greater cooling effect?

A. High boiling point B. Low boiling point C. High viscosity D. Thick solutions

28. What happens when evaporation occurs in a room?

A. Room heats up B. Air becomes heavy C. Temperature drops D. Water freezes

29. Why does blowing air on the tongue feel cool when it's wet?

A. Evaporation of saliva B. Movement of air only C. Teeth absorb heat D. Pressure drops

30. Why does sweating more make you feel cooler in summer?

A. More sweat adds moisture to air B. Evaporation removes more body heat C. Skin opens pores D. Sweating creates breeze

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