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Question (31)

QN004892

A student claims that rain falls because clouds become lighter. Why is the statement incorrect?

(A) Clouds never contain water
(B) Rain falls when drops become heavy
(C) Clouds are made of air only
(D) Dust particles fall first

Correct Answer: B

Explanation:

Raindrops fall when they become heavy.

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Question (32)

QN004893

Which of the following is the best example of condensation related to cloud formation?

(A) Ice melting in a glass
(B) Water boiling in a pan
(C) Water vapour forming droplets in cool air
(D) Snow melting on a mountain

Correct Answer: C

Explanation:

Condensation forms liquid droplets from vapour.

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Question (33)

QN004894

If 2400 droplets form in a cloud and one-third become large drops, how many large-drop droplets are there?

(A) 600
(B) 700
(C) 800
(D) 900

Correct Answer: C

Explanation:

2400 ÷ 3 = 800.

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Question (34)

QN004895

During cloud formation, dust particles mainly act as:

(A) Sources of heat
(B) Places where water vapour can condense
(C) Sources of rainwater
(D) Air coolers

Correct Answer: B

Explanation:

Dust particles provide surfaces for condensation.

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Question (35)

QN004896

In Activity 8.10, the haziness inside the bottle represents:

(A) Groundwater
(B) Steam from boiling water
(C) Clouds formed by condensed water droplets
(D) Smoke particles only

Correct Answer: C

Explanation:

The haziness represents cloud formation.

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Question (36)

QN004897

A cloud has 150 large drops. If 30 become heavy enough to fall each minute, how many will remain after 3 minutes?

(A) 30
(B) 45
(C) 60
(D) 90

Correct Answer: C

Explanation:

150 − (30 × 3) = 60.

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Question (37)

QN004898

Which statement connects science with society most appropriately?

(A) Rain has no importance in daily life
(B) Cloud formation helps return water to Earth's surface
(C) Clouds prevent evaporation forever
(D) Rain occurs only over oceans

Correct Answer: B

Explanation:

Rain returns water to Earth and supports life.

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Question (38)

QN004899

Which statement about rainfall is correct?

(A) Water vapour falls directly as rain without forming droplets
(B) Tiny droplets first form clouds and later become rain
(C) Rain is formed only from rivers
(D) Dust particles themselves become raindrops

Correct Answer: B

Explanation:

Rain forms after cloud droplets combine and grow.

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Question (39)

QN004900

According to the water cycle, rainwater eventually:

(A) Disappears permanently
(B) Changes only into ice
(C) Flows back towards oceans through various pathways
(D) Remains in clouds forever

Correct Answer: C

Explanation:

Water returns to oceans through the water cycle.

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Question (40)

QN004901

India’s traditional understanding of rain and water conservation highlights that rainfall is important because:

(A) Fresh usable water is limited on Earth
(B) Oceans provide all drinking water directly
(C) Clouds create unlimited water
(D) Rainwater has no role in human life

Correct Answer: A

Explanation:

Fresh usable water is limited and must be conserved.

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Question (31)

A student claims that rain falls because clouds become lighter. Why is the statement incorrect?

Explanation:

Link:

Question (32)

Which of the following is the best example of condensation related to cloud formation?

Explanation:

Link:

Question (33)

If 2400 droplets form in a cloud and one-third become large drops, how many large-drop droplets are there?

Explanation:

Link:

Question (34)

During cloud formation, dust particles mainly act as:

Explanation:

Link:

Question (35)

In Activity 8.10, the haziness inside the bottle represents:

Explanation:

Link:

Question (36)

A cloud has 150 large drops. If 30 become heavy enough to fall each minute, how many will remain after 3 minutes?

Explanation:

Link:

Question (37)

Which statement connects science with society most appropriately?

Explanation:

Link:

Question (38)

Which statement about rainfall is correct?

Explanation:

Link:

Question (39)

According to the water cycle, rainwater eventually:

Explanation:

Link:

Question (40)

India’s traditional understanding of rain and water conservation highlights that rainfall is important because:

Explanation:

Link:

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