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Question (11)

QN0029723

Which colour of clothing is most suitable during hot summer afternoons?

(A) Black
(B) Dark blue
(C) White
(D) Brown

Correct Answer: C

Explanation:

White reflects most heat radiation.

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Question (12)

QN0029724

Why do black surfaces become hotter quickly in sunlight?

(A) They reflect all radiation
(B) They absorb more heat radiation
(C) They stop evaporation
(D) They produce heat energy

Correct Answer: B

Explanation:

Dark colours are good absorbers of radiant heat.

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Question (13)

QN0029725

Heat from the Sun reaches Earth mainly through —

(A) conduction
(B) convection
(C) radiation
(D) diffusion

Correct Answer: C

Explanation:

Radiation can travel through space without a medium.

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Question (14)

QN0029726

A shiny silver thermos flask reduces heat loss mainly because shiny surfaces —

(A) absorb heat quickly
(B) reflect heat radiation
(C) increase convection
(D) produce cooling

Correct Answer: B

Explanation:

Shiny surfaces are poor absorbers and good reflectors.

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Question (15)

QN0029727

Wet clothes dry faster on a windy day because —

(A) condensation increases
(B) evaporation becomes faster
(C) freezing occurs
(D) clouds absorb moisture

Correct Answer: B

Explanation:

Wind removes water vapour near the clothes.

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Question (16)

QN0029728

Which process changes water vapour into tiny water droplets in clouds?

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

Correct Answer: B

Explanation:

Cooling of vapour causes condensation.

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Question (17)

QN0029729

A cold water bottle taken out of a refrigerator becomes covered with water droplets because of —

(A) evaporation
(B) boiling
(C) condensation
(D) freezing

Correct Answer: C

Explanation:

Water vapour from air condenses on the cold bottle surface.

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Question (18)

QN0029730

Which factor will increase the rate of evaporation the most?

(A) High humidity
(B) Low temperature
(C) Large surface area
(D) Closed container

Correct Answer: C

Explanation:

Greater exposed area allows faster evaporation.

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Question (19)

QN0029731

Groundwater is mainly replenished through —

(A) radiation from the Sun
(B) seepage of rainwater into soil
(C) evaporation from oceans
(D) transpiration from plants

Correct Answer: B

Explanation:

Rainwater infiltrates and refills underground water.

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Question (20)

QN0029732

Which sequence correctly represents major stages of the water cycle?

(A) Evaporation → Condensation → Precipitation
(B) Condensation → Freezing → Radiation
(C) Precipitation → Sublimation → Melting
(D) Freezing → Evaporation → Conduction

Correct Answer: A

Explanation:

Water evaporates, forms clouds by condensation, and returns as precipitation.

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Question (11)

Which colour of clothing is most suitable during hot summer afternoons?

Explanation:

Link:

Question (12)

Why do black surfaces become hotter quickly in sunlight?

Explanation:

Link:

Question (13)

Heat from the Sun reaches Earth mainly through —

Explanation:

Link:

Question (14)

A shiny silver thermos flask reduces heat loss mainly because shiny surfaces —

Explanation:

Link:

Question (15)

Wet clothes dry faster on a windy day because —

Explanation:

Link:

Question (16)

Which process changes water vapour into tiny water droplets in clouds?

Explanation:

Link:

Question (17)

A cold water bottle taken out of a refrigerator becomes covered with water droplets because of —

Explanation:

Link:

Question (18)

Which factor will increase the rate of evaporation the most?

Explanation:

Link:

Question (19)

Groundwater is mainly replenished through —

Explanation:

Link:

Question (20)

Which sequence correctly represents major stages of the water cycle?

Explanation:

Link:

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