A Journey through States of Water Part 2: MCQs (Q26–Q50)
Part 2 — Questions 26 to 50 (Processes & Water Cycle)
26. The process of water changing into vapor at any temperature below boiling point is
A. Condensation
B. Freezing
C. Evaporation ← Correct Answer
D. Melting
Explanation:
C) Correct — evaporation occurs at all temperatures, not just boiling.
27. Which of these helps evaporation?
A. Less surface area
B. No wind
C. High temperature and wind speed ← Correct Answer
D. High humidity
Explanation:
C) Correct — heat + airflow accelerate evaporation.
28. Which process is opposite to evaporation?
A. Melting
B. Condensation ← Correct Answer
C. Freezing
D. Sublimation
Explanation:
B) Correct — condensation = vapor → liquid, reverse of evaporation.
29. In water cycle, rain formation is due to
A. Evaporation
B. Condensation of vapor into droplets ← Correct Answer
C. Melting of ice
D. Freezing of rivers
Explanation:
B) Correct — condensation forms clouds → rain.
30. Snowfall is caused when
A. Water condenses as liquid
B. Water vapor freezes directly into ice crystals ← Correct Answer
C. Ice melts
D. Rivers overflow
Explanation:
B) Correct — direct freezing forms snow.
31. Which process forms dew?
A. Condensation of water vapor on cool surfaces ← Correct Answer
B. Freezing
C. Sublimation
D. Melting
Explanation:
A) Correct — moisture condenses as droplets.
32. Which process explains drying of clothes in shade?
A. Melting
B. Evaporation ← Correct Answer
C. Condensation
D. Sublimation
Explanation:
B) Correct — water evaporates slowly even without sun.
33. Clouds are made of
A. Gas only
B. Tiny water droplets/ice crystals ← Correct Answer
C. Dust alone
D. Air only
Explanation:
B) Correct — condensed vapor forms droplets/ice crystals.
34. The continuous circulation of water in nature is called
A. Hydrology
B. Water cycle ← Correct Answer
C. Condensation cycle
D. Sublimation cycle
Explanation:
B) Correct — water cycle describes evaporation, condensation, precipitation.
35. Which process adds water vapor to the atmosphere?
A. Evaporation and transpiration ← Correct Answer
B. Condensation
C. Freezing
D. Melting
Explanation:
A) Correct — evaporation from water bodies + transpiration from plants.
36. Which process removes water vapor from atmosphere?
A. Melting
B. Freezing
C. Condensation (forming clouds, rain) ← Correct Answer
D. Evaporation
Explanation:
C) Correct — vapor condenses into water/ice.
37. Which factor slows down evaporation?
A. High temperature
B. Wind
C. Large surface area
D. High humidity ← Correct Answer
Explanation:
D) Correct — humid air already contains vapor, slowing evaporation.
38. Boiling is different from evaporation because
A. Occurs at any temperature
B. Occurs only at boiling point throughout the liquid ← Correct Answer
C. Produces no vapor
D. Needs no heat
Explanation:
B) Correct — boiling happens at fixed temperature, all through liquid.
39. Which of these is an example of condensation?
A. Clothes drying
B. Ice melting
C. Water droplets on cold glass of water ← Correct Answer
D. Salt dissolving
Explanation:
C) Correct — vapor condenses into liquid droplets.
40. Sublimation of naphthalene balls shows
A. Solid → liquid
B. Solid → gas ← Correct Answer
C. Liquid → gas
D. Gas → liquid
Explanation:
B) Correct — naphthalene changes directly from solid to gas.
41. Which process forms frost on grass?
A. Melting
B. Condensation + freezing ← Correct Answer
C. Evaporation
D. Boiling
Explanation:
B) Correct — vapor condenses then freezes as frost.
42. Which of these shows sublimation?
A. Steam condensing
B. Ice melting
C. Camphor disappearing at room temp ← Correct Answer
D. Rain falling
Explanation:
C) Correct — camphor sublimes directly to gas.
43. Which change occurs in making ice candy?
A. Sublimation
B. Freezing of liquid water into solid ← Correct Answer
C. Evaporation
D. Condensation
Explanation:
B) Correct.
44. Heat absorbed during melting is called
A. Specific heat
B. Latent heat of fusion ← Correct Answer
C. Latent heat of vaporization
D. Heat capacity
Explanation:
B) Correct — energy needed to melt solid at constant temp.
45. Heat absorbed during boiling is called
A. Latent heat of fusion
B. Latent heat of vaporization ← Correct Answer
C. Specific heat
D. Heat capacity
Explanation:
B) Correct — energy needed to vaporize liquid at boiling point.
46. Formation of clouds is mainly due to
A. Melting
B. Freezing
C. Condensation of vapor high up ← Correct Answer
D. Evaporation from soil
Explanation:
C) Correct — vapor rises, cools, condenses into clouds.
47. Which of these is a reversible change?
A. Burning candle
B. Freezing water into ice ← Correct Answer
C. Cooking food
D. Rusting
Explanation:
B) Correct — can melt back into water.
48. Which of these is NOT part of the water cycle?
A. Precipitation
B. Evaporation
C. Transpiration
D. Photosynthesis ← Correct Answer
Explanation:
D) Correct — photosynthesis uses water, but not a direct cycle process.
49. Steam condenses on a cold lid because
A. Evaporation occurs
B. Temperature of lid is lower → condensation ← Correct Answer
C. Vapor is heavier
D. Pressure decreases
Explanation:
B) Correct — cooling causes vapor → liquid.
50. Which of these shows evaporation in daily life?
A. Melting ice
B. Sweat drying from skin ← Correct Answer
C. Condensation on glass
D. Frost on leaves
Explanation:
B) Correct — sweat evaporates, cooling skin.
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