Question

During summer, water kept in an earthen pot becomes cool because of the phenomenon of _______

• A. Diffusion
• B. Transpiration
• C. Osmosis
• D. Evaporation

Answer 1

The correct option is D

Evaporation

The explanation for the correct option:

(D) Evaporation: It is a process that converts liquid into gas

• During summer, water kept in an earthen pot becomes cool because of the phenomenon of evaporation.
• An earthen pot has numerous tiny pores in its walls and some water molecules continuously keep seeping through these pores to outside the pot.
• This water evaporates continuously and takes the latent heat required for vaporization from the remaining water.
• In this way, the remaining water loses heat and gets cooled.

The explanation for the incorrect option:

(A) Diffusion: It is a process of movement of molecules from higher concentration to lower concentration. It happens usually in liquids and gases.

(B) Transpiration: It is a phenomenon that happens in plants where water is lost through the small pores called stomata.

(C) Osmosis: The movement of solvent molecules through a semi-permeable membrane is called osmosis.

Therefore, option (D) is correct, i.e., during summer, water kept in an earthen pot becomes cool because of the phenomenon of evaporation.