Discussion
Assertion (A) : Wet clothes take a longer time to dry on a humid day.
Reason (R) : The rate of evaporation increases on a humid day.
Answer: D
(A) is true, but (R) is false.
Wet clothes do take longer to dry on a humid day. Drying depends on evaporation, and the amount of water that can evaporate depends on how much more water vapour the air can hold.
On a humid day the air already holds a lot of water vapour, close to saturation, so the rate of evaporation decreases, not increases. That is exactly why the clothes dry slowly. So the reason states the opposite of the truth, which rules out the options calling both statements true, and the option calling both false.
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