Question

B,Water coolers are not effective on a rainy day.Why?

Answer 1

SOLUTION :

Water coolers are not effective on a rainy day because in a rainy day humidity level in the air is very high. Due to this High humidity level the rate of evaporation decreases & due to this low evaporation rate , the cooling effect also become lesser (decreases).

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Answer 2

Water coolers are not effective on a rainy day because of high humidity in the air. The rate of evaporation decreases due to high humidity as the amount of moisture in air is already high. Because of the decreased rate of evaporation cooling also decreases.