Question

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of:

(a) diffusion (b) transpiration (c) osmosis (d) evaporation

Answer 1

(d) evaporation

In an earthen pot, water gets evaporated quickly through the pores. Cooling is caused by evaporation. Some heat energy is utilized during the process of evaporation. Since this energy is taken from the water itself, it leads to a lowering of temperature in the remaining amount of water.