Assertion (A): The rate of evaporation of water in a plate is higher than that in a cup.

Reason (R): The rate of evaporation decreases with increase in humidity.

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Both A and B are true and R is the correct explanation of A.

Both A and B are true and R is not the correct explanation of A.

A is true but R is false

A is false but R is true

answer is B.

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Detailed Solution

Both assertion and reasoning is true. Reasoning is the correct explanation of A.
The rate of evaporation is dependent on the surface area. With the increase in surface area, the rate of evaporation increases, so the rate of evaporation will be faster on plate than in the cup as the surface area of the plate is more than the cup.
The rate of evaporation is also dependent on the humidity. Therefore, with the increase in humidity, the rate of evaporation decreases and this phenomenon can be seen on rainy days as clothes dry out slower on rainy days.

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