Previous year MCQs

General science UPPSC 2024 GS-I
Question

Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R)

Assertion (A) : Relative humidity decreases with increasing air temperature.
Reason (R) : Absolute humidity increases with increasing evaporation.

Select the correct answer from the codes given below:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Both(A) and (R) are true, but (R) is not the correct explanation of(A).

Detailed Solution:

The correct answer is “Both(A) and (R) are true, but (R) is not the correct explanation of(A).”.
Absolute humidity is the amount of water vapor in a given volume of air, while relative humidity is the amount of water vapor in the air relative to the maximum amount it can hold.

As the air temperature increases, the maximum amount of moisture the air can hold also increases, but if the amount of water vapor remains the same, the relative humidity will decrease.

As evaporation occurs, more water vapor is added to the air, which leads to an increase in absolute humidity.

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