The percentage of oxygen in the atmosphere is approximately: MCQ with Answer and Explanation

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The percentage of oxygen in the atmosphere is approximately:

A. 21%

B. 25%

C. 30%

D. 18%

Answer: Option A

Solution (By JKSSB Mock Tests)

Oxygen constitutes approximately 20.95% of the Earth's atmosphere.

This question belongs to: Geography GK Physical Geography

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The combined process of evaporation and transpiration is known as:

A. Infiltration

B. Precipitation

C. Evapotranspiration

D. Condensation

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Correct Answer: Option C

Explanation:
Evapotranspiration refers to water transfer from land to atmosphere through evaporation and plant transpiration.

This question belongs to: Geography GK Physical Geography

Question #2

Fog is essentially:

A. High cloud

B. Ground-level cloud

C. Dust storm

D. Water current

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Correct Answer: Option B

Explanation:
Fog forms when water vapor condenses near the Earth's surface, creating a ground-level cloud.

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Question #3

Which layer of the atmosphere reflects radio waves?

A. Troposphere

B. Ionosphere

C. Mesosphere

D. Stratosphere

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Correct Answer: Option B

Explanation:
The ionosphere contains charged particles that reflect radio waves for long-distance communication.

This question belongs to: Geography GK Physical Geography

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