UPSC Prelims 2023 – Question 62

Q62. With reference to the Earth’s atmosphere, which one of the following statements is correct? 

1. The total amount of insolation received at the equator is roughly about 10 times of that received at the poles. 

2. Infrared rays constitute roughly two-thirds of insolation. 

3. Infrared waves are largely absorbed by water vapor that is concentrated in the lower atmosphere. 

4. Infrared waves are a part of the visible spectrum of electromagnetic waves of solar radiation. 

Correct Answer: Option (c) 

• The Earth’s surface receives most of its energy in short wavelengths. The energy received by the earth is known as incoming solar radiation, which in short, is termed insolation. The atmosphere is largely transparent to short-wave solar radiation. The incoming solar radiation passes through the atmosphere before striking the earth’s surface. Within the troposphere water vapor, ozone and other gases absorb much of the near-infrared radiation. Hence, option (c) is correct. 

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