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Question (21)

QN008834

Water continuously circulates among atmosphere, land and oceans through the:

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

Correct Answer: C

Explanation:

The water cycle continuously circulates water through Earth's systems.

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Question (22)

QN008835

The process by which liquid water changes into water vapour is called:

(A) Condensation
(B) Evaporation
(C) Precipitation
(D) Infiltration

Correct Answer: B

Explanation:

Evaporation converts liquid water into vapour.

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Question (23)

QN008836

Water vapour changes into tiny droplets in clouds through:

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

Correct Answer: A

Explanation:

Condensation forms clouds from water vapour.

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Question (24)

QN008837

A lake loses 6000 L of water through evaporation and gains 4200 L through rainfall in one day. The net loss is:

(A) 1800 L
(B) 6000 L
(C) 4200 L
(D) 10200 L

Correct Answer: A

Explanation:

Net loss = 6000 − 4200 = 1800 L.

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Question (25)

QN008838

Water released from plant leaves into the atmosphere is known as:

(A) Precipitation
(B) Runoff
(C) Transpiration
(D) Percolation

Correct Answer: C

Explanation:

Plants lose water vapour through transpiration.

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Question (26)

QN008839

Which process allows water to move from the surface into the soil?

(A) Infiltration
(B) Condensation
(C) Evaporation
(D) Respiration

Correct Answer: A

Explanation:

Infiltration is the entry of water into soil.

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Question (27)

QN008840

If a tree transpires 40 L of water per day, how much water does it transpire in 15 days?

(A) 400 L
(B) 500 L
(C) 600 L
(D) 700 L

Correct Answer: C

Explanation:

40 × 15 = 600 L.

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Question (28)

QN008841

Which of the following is a major natural source of atmospheric carbon dioxide?

(A) Photosynthesis
(B) Respiration
(C) Nitrogen fixation
(D) Root absorption

Correct Answer: B

Explanation:

Respiration releases carbon dioxide into the atmosphere.

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Question (29)

QN008842

Which human activity contributes most directly to disruption of the carbon cycle?

(A) Afforestation
(B) Composting
(C) Burning fossil fuels
(D) Rainwater harvesting

Correct Answer: C

Explanation:

Fossil fuel combustion releases stored carbon into the atmosphere.

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Question (30)

QN008843

If atmospheric CO₂ concentration increases significantly, the most likely effect is:

(A) Enhanced greenhouse effect
(B) Reduced evaporation
(C) Reduced respiration
(D) Decreased temperature

Correct Answer: A

Explanation:

Increased CO₂ strengthens the greenhouse effect.

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Question (21)

Water continuously circulates among atmosphere, land and oceans through the:

Explanation:

Link:

Question (22)

The process by which liquid water changes into water vapour is called:

Explanation:

Link:

Question (23)

Water vapour changes into tiny droplets in clouds through:

Explanation:

Link:

Question (24)

A lake loses 6000 L of water through evaporation and gains 4200 L through rainfall in one day. The net loss is:

Explanation:

Link:

Question (25)

Water released from plant leaves into the atmosphere is known as:

Explanation:

Link:

Question (26)

Which process allows water to move from the surface into the soil?

Explanation:

Link:

Question (27)

If a tree transpires 40 L of water per day, how much water does it transpire in 15 days?

Explanation:

Link:

Question (28)

Which of the following is a major natural source of atmospheric carbon dioxide?

Explanation:

Link:

Question (29)

Which human activity contributes most directly to disruption of the carbon cycle?

Explanation:

Link:

Question (30)

If atmospheric CO₂ concentration increases significantly, the most likely effect is:

Explanation:

Link:

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