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Question (11)

QN0026516

Which pair correctly represents a process and its role in the nitrogen cycle?

(A) Denitrification — nitrate to nitrogen gas
(B) Assimilation — nitrogen gas to ammonia
(C) Nitrification — nitrate to ammonia
(D) Ammonification — nitrogen gas to nitrate

Correct Answer: A

Explanation:

Denitrification converts nitrates into atmospheric nitrogen gas, completing the nitrogen cycle.

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Question (12)

QN0026517

If global temperatures continue rising, which chain of events is most likely?

(A) Glacier growth → sea level fall → habitat expansion
(B) Glacier melting → sea level rise → habitat loss
(C) Increased snowfall → drought → biodiversity increase
(D) Lower evaporation → stronger monsoon

Correct Answer: B

Explanation:

Rising global temperatures melt glaciers, causing sea levels to rise and threatening habitats.

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Question (13)

QN0026518

A scientist observes intense storms, cloud formation and rainfall in a particular atmospheric layer. Which layer is being studied?

(A) Stratosphere
(B) Mesosphere
(C) Troposphere
(D) Exosphere

Correct Answer: C

Explanation:

Most weather phenomena, including storms and rainfall, occur in the troposphere.

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Question (14)

QN0026519

In a certain lake, excessive fertilisers from nearby farms enter the water. Fish deaths begin occurring. The most likely reason is:

(A) increased oxygen due to algae
(B) eutrophication causing oxygen depletion
(C) reduced sunlight reaching water
(D) increased salinity of lake water

Correct Answer: B

Explanation:

Excess nutrients cause algal blooms, which consume dissolved oxygen and lead to fish deaths.

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Question (15)

QN0026520

An astronaut compares Earth and Venus. Venus is hotter than Mercury mainly because Venus has:

(A) stronger solar radiation
(B) a dense atmosphere causing greenhouse effect
(C) a higher albedo than Mercury
(D) faster rotation speed

Correct Answer: B

Explanation:

Venus has a thick atmosphere rich in CO₂, resulting in an extreme greenhouse effect.

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Question (16)

QN0026521

If Earth's rotation suddenly stopped while all other conditions remained unchanged, planetary winds would:

(A) continue moving in curved paths
(B) move directly from high to low pressure regions
(C) disappear completely
(D) reverse direction everywhere

Correct Answer: B

Explanation:

The curved paths of planetary winds are caused by Earth's rotation. Without rotation, winds would move directly.

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Question (17)

QN0026522

Ocean water near the poles is colder and saltier. Therefore, it generally:

(A) remains on the surface
(B) evaporates rapidly
(C) sinks and moves at deeper levels
(D) flows directly toward the equator at the surface

Correct Answer: C

Explanation:

Cold and saline water is denser, so it sinks and moves through deeper ocean layers.

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Question (18)

QN0026523

Which activity would simultaneously help restore both carbon and oxygen cycles?

(A) Increased mining
(B) Afforestation
(C) Excessive fertiliser use
(D) Urban expansion

Correct Answer: B

Explanation:

Trees absorb carbon dioxide and release oxygen, helping maintain both cycles.

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Question (19)

QN0026524

If the Earth were perfectly flat instead of spherical, which statement would most likely be true?

(A) Equator would remain hottest
(B) Poles would remain cold
(C) Solar radiation would be more uniformly distributed
(D) Winds would cease to exist

Correct Answer: C

Explanation:

A flat Earth would receive solar radiation more uniformly, reducing temperature differences.

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Question (20)

QN0026525

A forested area is cleared for agriculture. Which combination of effects is most likely?

(A) Increased infiltration, increased biodiversity
(B) Reduced transpiration, increased soil erosion
(C) Increased rainfall, reduced runoff
(D) Increased carbon storage, lower temperature

Correct Answer: B

Explanation:

Deforestation reduces transpiration and exposes soil, increasing erosion.

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Question (11)

Which pair correctly represents a process and its role in the nitrogen cycle?

Explanation:

Link:

Question (12)

If global temperatures continue rising, which chain of events is most likely?

Explanation:

Link:

Question (13)

A scientist observes intense storms, cloud formation and rainfall in a particular atmospheric layer. Which layer is being studied?

Explanation:

Link:

Question (14)

In a certain lake, excessive fertilisers from nearby farms enter the water. Fish deaths begin occurring. The most likely reason is:

Explanation:

Link:

Question (15)

An astronaut compares Earth and Venus. Venus is hotter than Mercury mainly because Venus has:

Explanation:

Link:

Question (16)

If Earth's rotation suddenly stopped while all other conditions remained unchanged, planetary winds would:

Explanation:

Link:

Question (17)

Ocean water near the poles is colder and saltier. Therefore, it generally:

Explanation:

Link:

Question (18)

Which activity would simultaneously help restore both carbon and oxygen cycles?

Explanation:

Link:

Question (19)

If the Earth were perfectly flat instead of spherical, which statement would most likely be true?

Explanation:

Link:

Question (20)

A forested area is cleared for agriculture. Which combination of effects is most likely?

Explanation:

Link:

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