Topic 7 – Evaporation

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🪨 Topic 7 – Evaporation Quiz

1. What is evaporation?

A. Conversion of liquid into vapor from the surface B. Conversion of solid into liquid C. Conversion of liquid into solid D. Conversion of gas into liquid

2. At what temperature does evaporation take place?

A. At 100°C only B. At 0°C only C. At all temperatures D. At freezing point

3. Where does evaporation occur in a liquid?

A. Inside the liquid B. On the surface C. At the bottom D. At the boiling point

4. What effect does increasing temperature have on evaporation?

A. It stops evaporation B. It decreases it C. No effect D. It increases evaporation

5. How does surface area affect evaporation?

A. It has no effect B. It reduces it C. It increases evaporation D. It blocks evaporation

6. How does wind speed affect evaporation?

A. Increases it B. Decreases it C. No effect D. Changes temperature

7. How does low humidity affect evaporation?

A. Slows it down B. Has no effect C. Stops it completely D. Increases evaporation

8. Why does evaporation cause cooling?

A. It reduces pressure B. It increases temperature C. Particles absorb heat and escape D. None of these

9. Why do clothes dry faster on a windy day?

A. Wind makes them warm B. Wind increases evaporation C. Wind reduces humidity D. All of the above

10. Can evaporation occur at room temperature?

A. Yes B. No C. Only in cold places D. Only in hot places

11. Which type of liquid evaporates faster?

A. High boiling point liquids B. Low boiling point liquids C. Liquids with more density D. Liquids with no color

12. How does sweating help in cooling our body?

A. By increasing temperature B. By decreasing blood flow C. By evaporation of sweat D. By absorbing water

13. Why do we feel cool when alcohol is applied to the skin?

A. It is cold B. It heats the skin C. It mixes with water D. It evaporates quickly

14. Which condition increases the rate of evaporation?

A. High humidity B. Dry air C. Rainfall D. Cold temperature

15. Which of the following is true about evaporation?

A. It occurs throughout the liquid B. It needs boiling C. It occurs from the surface D. It cools down solids only

16. Why do desert coolers work better in dry regions?

A. Faster evaporation due to low humidity B. More water supply C. High pressure D. High temperature only

17. Which of these does NOT affect evaporation?

A. Wind speed B. Temperature C. Surface area D. Density of the container

18. Why does water stay cool in an earthen pot?

A. It has a small opening B. Pot is thick C. Water evaporates from porous surface D. It blocks sunlight

19. Why does water in a saucer evaporate faster than in a glass?

A. Glass is deeper B. Saucer has larger surface area C. Saucer is thinner D. Glass has more volume

20. Which of these is a practical use of evaporation?

A. Drying clothes B. Melting butter C. Cutting vegetables D. Boiling water

21. What happens to body temperature when sweat evaporates?

A. It increases B. It remains the same C. It decreases D. It becomes zero

22. In salt pans, how is common salt obtained from sea water?

A. Condensation B. Filtration C. Boiling D. Evaporation

23. What is the main difference between evaporation and boiling?

A. Both occur at same temperature B. Evaporation occurs at all temperatures C. Boiling occurs only at the surface D. Evaporation needs more heat than boiling

24. Why does increasing temperature increase evaporation rate?

A. Particles gain more energy B. Liquid becomes solid C. Liquid density increases D. Wind is produced

25. What is the effect of high wind speed on the rate of evaporation?

A. Decreases it B. No change C. Increases it D. Stops evaporation

26. Which of these best shows evaporation in daily life?

A. Ironing clothes B. Drying of wet floor C. Melting of ice D. Freezing of water

27. Why do clothes take longer to dry on a humid day?

A. Less evaporation due to high moisture in air B. Less sunlight C. Cooler temperature D. Wind is strong

28. How does evaporation help in nature?

A. Increases global warming B. Warms up atmosphere C. Adds humidity D. Cools surroundings

29. Why is evaporation faster in open containers?

A. Air is trapped B. More heat is generated C. More surface area is exposed D. Light enters easily

30. Why do you feel cool when water evaporates from your skin?

A. Water freezes B. Heat is taken away from your body C. Your skin absorbs sunlight D. Blood flow decreases

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