Chapter 8. A Journey through States of Water Science Curiosity class 6 in English Medium ncert book solutions 40 Important MCQs with Answers

Chapter 8. A Journey through States of Water

The following multiple-choice questions are prepared according to the latest NCERT Curiosity textbook and CBSE competency-based pattern. These questions cover conceptual understanding, application-based learning, and everyday situations related to the different states of water.

40 Important MCQs with Answer Key

Choose the most appropriate answer for each question.

1. Water naturally exists in how many physical states?

(A) One    (B) Two    (C) Three    (D) Four

2. Which of the following is the solid state of water?

(A) Steam    (B) Ice    (C) Rain    (D) Dew

3. Water vapour is the ______ state of water.

(A) Solid    (B) Liquid    (C) Gaseous    (D) Frozen

4. Which process changes ice into water?

(A) Freezing    (B) Melting    (C) Evaporation    (D) Condensation

5. Which process changes water into ice?

(A) Condensation    (B) Melting    (C) Freezing    (D) Evaporation

6. Evaporation changes water into

(A) Ice    (B) Steam or water vapour    (C) Snow    (D) Dew

7. Condensation changes water vapour into

(A) Ice    (B) Liquid water    (C) Steam    (D) Snow

8. Evaporation can occur

(A) Only at 100°C    (B) Only in summer    (C) At all temperatures    (D) Only at night

9. Which factor increases evaporation?

(A) High humidity    (B) Low temperature    (C) Strong wind    (D) Small surface area

10. Which factor slows down evaporation?

(A) High temperature    (B) Wind    (C) High humidity    (D) Large surface area

11. Clothes dry faster on a windy day because

(A) Wind cools clothes    (B) Wind increases evaporation    (C) Wind freezes water    (D) Wind removes dust

12. Water droplets on the outside of a cold glass are formed due to

(A) Melting    (B) Freezing    (C) Condensation    (D) Boiling

13. Dew drops are formed because of

(A) Evaporation    (B) Condensation    (C) Melting    (D) Boiling

14. Which process is responsible for cloud formation?

(A) Melting    (B) Freezing    (C) Condensation    (D) Filtration

15. Which process produces a cooling effect?

(A) Freezing    (B) Melting    (C) Evaporation    (D) Condensation

16. Sweating cools our body because of

(A) Condensation    (B) Freezing    (C) Evaporation    (D) Melting

17. Water remains cool in an earthen pot because of

(A) Freezing    (B) Evaporation    (C) Melting    (D) Boiling

18. Which of the following has a fixed shape?

(A) Water    (B) Water vapour    (C) Ice    (D) Steam

19. Which state has a fixed volume but no fixed shape?

(A) Solid    (B) Liquid    (C) Gas    (D) Plasma

20. Which state has neither fixed shape nor fixed volume?

(A) Solid    (B) Liquid    (C) Gas    (D) Ice

21. The gaseous form of water is called

(A) Fog    (B) Water vapour    (C) Dew    (D) Snow

22. Which of these is NOT an example of evaporation?

(A) Drying clothes    (B) Drying a floor    (C) Water droplets on a cold bottle    (D) Drying wet hair

23. Humidity means

(A) Dust in air    (B) Water vapour in air    (C) Oxygen in air    (D) Smoke in air

24. A larger surface area makes evaporation

(A) Slower    (B) Faster    (C) Stop    (D) Impossible

25. Which process requires heat?

(A) Condensation    (B) Evaporation    (C) Freezing    (D) Solidification

26. During condensation, water vapour

(A) Gains heat    (B) Loses heat    (C) Boils    (D) Freezes directly

27. Rain is a part of the

(A) Nitrogen cycle    (B) Carbon cycle    (C) Water cycle    (D) Rock cycle

28. Which stage comes after condensation in the water cycle?

(A) Evaporation    (B) Collection    (C) Precipitation    (D) Freezing

29. Which of the following is a form of precipitation?

(A) Rain    (B) Snow    (C) Hail    (D) All of these

30. The Sun provides energy mainly for

(A) Condensation    (B) Evaporation    (C) Freezing    (D) Collection

31. Which process changes water vapour into clouds?

(A) Melting    (B) Condensation    (C) Freezing    (D) Boiling

32. Which statement about water is correct?

(A) It exists only as a liquid    (B) It exists only as a solid    (C) It exists in three states    (D) It cannot change its state

33. Artificial grass feels warmer than natural grass because

(A) It evaporates more water    (B) It has no evaporation cooling effect    (C) It freezes easily    (D) It absorbs less heat

34. Which liquid evaporates faster than water?

(A) Honey    (B) Alcohol    (C) Glycerine    (D) Oil

35. Which of the following is an example of melting?

(A) Ice cream becoming liquid    (B) Water becoming ice    (C) Steam forming clouds    (D) Rainfall

36. Which process occurs when water is kept inside a freezer?

(A) Evaporation    (B) Freezing    (C) Condensation    (D) Melting

37. Which process helps in making common salt from seawater?

(A) Condensation    (B) Evaporation    (C) Freezing    (D) Melting

38. The continuous circulation of water in nature is called

(A) Carbon cycle    (B) Nitrogen cycle    (C) Water cycle    (D) Rock cycle

39. Which process changes liquid water into water vapour?

(A) Freezing    (B) Condensation    (C) Evaporation    (D) Melting

40. Which statement is correct?

(A) Water is a renewable natural resource through the water cycle.
(B) Water can exist only in liquid form.
(C) Evaporation occurs only during summer.
(D) Condensation produces heat.

Answer Key

1-C, 2-B, 3-C, 4-B, 5-C, 6-B, 7-B, 8-C, 9-C, 10-C,
11-B, 12-C, 13-B, 14-C, 15-C, 16-C, 17-B, 18-C, 19-B, 20-C,
21-B, 22-C, 23-B, 24-B, 25-B, 26-B, 27-C, 28-C, 29-D, 30-B,
31-B, 32-C, 33-B, 34-B, 35-A, 36-B, 37-B, 38-C, 39-C, 40-A.

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