Question

Which of the following phenomena is based on the principle that cooling results due to evaporation?

• A. formation of water drops on the surface of a cold drink bottle
• B. formation of crystals of ice on the inner surface of the lid of an ice cream box in a freezer
• C. White foggy appearance on the surface of large ice cubes
• D. stretching of tounges by dogs during summer

Answer 1

The correct option is D

stretching of tounges by dogs during summer

Explanation for correct options:

Option (d)

• Evaporation: It is the type of vaporization which occurs at the surface of the liquid. The liquid state of matter will convert into gas.
• On evaporation of liquid cooling happens.
• The surface area of the tongue is providing the scope of evaporation.
• Stretching out tongue by the dogs helps them evaporate saliva and makes them feel cool.
• They can't sweat like human beings.
• In the case of human beings evaporation of sweat helps them feel cool.

Explanation for incorrect options:

Option(a)

• Condensation: It is the process of conversion of water vapor into liquid.
• Formation of water drops on the surface of a cold drink bottle.
• It is the type of condensation.

Option(b)

• Formation of crystals of ice on the inner surface of the lid of an ice cream box in a freezer.
• It is also the type of condensation.

Option(c)

• White foggy appearance on the surface of large ice cubes
• It is also the type of condensation.

Therefore, the correct option is an option(d)