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State PCS PYQPrelims 2025

UPPCS · Question 25

Given below are two statements, one labelled as Assertion (A) and the other as Reason (R). Assertion (A): Evaporation of sweat from human skin dissipates body heat. Reason (R): High humidity on a hot day increases discomfort. Select the correct answer using the code given below.

  1. (A) is false, but (R) is true
  2. Both (A) and (R) are true and (R) is the correct explanation of (A)
  3. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
  4. (A) is true, but (R) is false
Show answer & explanation

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

Explanation

Sweat cools us through latent heat of evaporation; high humidity slows evaporation and so increases discomfort. Both are true, but R does not explain A.