Q81 · UPSC Prelims 2022 · Set A · Geography

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Consider the following statements:1.High clouds primarily reflect solar radiation and cool the surface of the Earth.2.Low clouds have a high absorption of infrared radiation emanating from the Earth's surface and thus cause warming effect.Which of the statements given above is/are correct?

A 1 only
B 2 only
C Both 1 and 2
D Neither 1 nor 2

Correct answer: (d) Neither 1 nor 2

Explanation

  1. A

    1 only

    1 only. High clouds are not primarily a cooling reflector in the keyed physics.

  2. B

    2 only

    2 only. Low clouds are the stronger reflectors (cooling), not IR absorbers that warm as stated.

  3. C

    Both 1 and 2

    Both. Each sentence swaps the usual high/low cloud radiative roles.

  4. D

    Neither 1 nor 2

    Neither. High clouds tend to trap outgoing IR (warming); low clouds raise albedo (cooling). The statements reverse that.

Summary. Official key is (d) neither. High, thin clouds are better at trapping long-wave radiation; low, thick clouds reflect solar radiation and cool the surface. Statement 1 and statement 2 swap those roles.

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