A Journey through States of Water Part 1: MCQs (Q1–Q25)

Part 1 — Questions 1 to 25 (Basic properties of water and its states)

1. Water exists in nature in

A. Solid form only
B. Liquid form only
C. Gas form only
D. All three forms — solid, liquid, and gas ← Correct Answer
Explanation:
A/B/C) Incorrect — water is versatile.
D) Correct — ice (solid), liquid water, and water vapor (gas).

2. The solid state of water is called

A. Steam
B. Ice ← Correct Answer
C. Vapor
D. Cloud
Explanation:
A) Steam = gas form.
B) Correct — frozen water is called ice.
C/D) Not solid form.

3. The gaseous form of water is known as

A. Ice
B. Water vapor ← Correct Answer
C. Fog
D. Snow
Explanation:
A/D) Solids.
C) Fog is condensed droplets.
B) Correct — gaseous state is water vapor.

4. At what temperature does pure water freeze?

A. 100°C
B. 32°C
C. 0°C ← Correct Answer
D. –100°C
Explanation:
A) Boiling point.
B) Wrong scale.
C) Correct — water freezes at 0°C under normal pressure.
D) Too low.

5. At what temperature does pure water boil at sea level?

A. 100°C ← Correct Answer
B. 0°C
C. 50°C
D. 273°C
Explanation:
A) Correct — boiling point is 100°C.
B/C/D) Incorrect.

6. Conversion of water into vapor on heating is called

A. Condensation
B. Evaporation/Boiling ← Correct Answer
C. Freezing
D. Melting
Explanation:
A) Gas → liquid.
B) Correct — liquid → gas.
C/D) Other processes.

7. The change of water vapor to water is called

A. Sublimation
B. Freezing
C. Condensation ← Correct Answer
D. Melting
Explanation:
A) Solid ↔ gas.
B) Liquid → solid.
C) Correct — vapor → liquid.
D) Solid → liquid.

8. The process of ice changing directly into water vapor is

A. Freezing
B. Melting
C. Sublimation ← Correct Answer
D. Condensation
Explanation:
C) Correct — solid → gas directly.

9. Which state of water has the highest kinetic energy?

A. Ice
B. Water
C. Water vapor ← Correct Answer
D. Snow
Explanation:
C) Correct — gas particles move fastest.

10. Clouds are formed due to

A. Freezing
B. Melting
C. Condensation of water vapor ← Correct Answer
D. Evaporation
Explanation:
C) Correct — vapor condenses in atmosphere to form clouds.

11. Which of these is NOT a state of water?

A. Ice
B. Mist ← Correct Answer
C. Steam
D. Water
Explanation:
B) Mist = suspended droplets, not a fundamental state.

12. Ice floats on water because

A. It is heavier
B. It is less dense ← Correct Answer
C. It has no mass
D. Water pushes it up
Explanation:
B) Correct — ice density < water, so it floats.

13. Steam burns are more severe than boiling water burns because

A. Steam is cooler
B. Steam is dry
C. Steam contains extra latent heat ← Correct Answer
D. Steam is lighter
Explanation:
C) Correct — latent heat makes steam burns dangerous.

14. Melting of ice is a change from

A. Solid to gas
B. Gas to liquid
C. Solid to liquid ← Correct Answer
D. Liquid to solid
Explanation:
C) Correct.

15. Freezing of water is a change from

A. Gas to solid
B. Liquid to solid ← Correct Answer
C. Solid to liquid
D. Liquid to gas
Explanation:
B) Correct.

16. Evaporation is faster when

A. Air is humid
B. Air is dry and temperature is high ← Correct Answer
C. No air movement
D. Low surface area
Explanation:
B) Correct — heat, dryness, wind accelerate evaporation.

17. Which of the following involves cooling?

A. Freezing
B. Evaporation ← Correct Answer
C. Boiling
D. Melting
Explanation:
B) Correct — evaporation uses heat from surroundings → cooling effect.

18. Condensation releases

A. Light
B. Heat ← Correct Answer
C. Cold
D. Nothing
Explanation:
B) Correct — latent heat released in condensation.

19. Which change is reversible?

A. Burning paper
B. Rusting iron
C. Freezing water ← Correct Answer
D. Cooking rice
Explanation:
C) Correct — ice ↔ water reversible.

20. Which change is irreversible?

A. Melting ice
B. Boiling egg ← Correct Answer
C. Freezing water
D. Condensation
Explanation:
B) Correct — egg can’t return to raw state.

21. The temperature at which ice and water coexist is

A. 100°C
B. 0°C ← Correct Answer
C. 50°C
D. 32°C
Explanation:
B) Correct — melting/freezing point.

22. The temperature at which water and steam coexist is

A. 0°C
B. 50°C
C. 100°C ← Correct Answer
D. 212°C
Explanation:
C) Correct — boiling/condensation point.

23. Water vapor in air is called

A. Steam
B. Moisture ← Correct Answer
C. Mist
D. Rain
Explanation:
B) Correct — invisible vapor = moisture.

24. Dew drops form due to

A. Freezing
B. Condensation ← Correct Answer
C. Evaporation
D. Melting
Explanation:
B) Correct — vapor condenses on cool surfaces at night.

25. Fog is caused by

A. Condensation of water vapor near ground ← Correct Answer
B. Melting
C. Freezing
D. Evaporation
Explanation:
A) Correct — tiny droplets suspended in air.

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