Which of the following is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials?

Question

Question

This question was previously asked in

SSC CGL 2020 Tier-I Official Paper 1 (Held On : 13 Aug 2021 Shift 1)

Answer 1

The correct answer is Convection.

Key Points

Convection is a mode of heat transfer by the actual motion of matter.
Convection is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials.
Convection is possible only in fluids.
Convection can be either be natural or forced.
Gravity plays a major role in natural convection.
Material is forced to move by a pump or by some other physical means in forced convection.
Forced-air heating systems in the home, the human circulatory system are the common examples of forced convection.

Additional Information

The three distinct modes of heat transfer are:
1. Conduction.
2. Convection.
3. Radiation.
The process of heat transfer without any medium is called radiation.
Conduction is the process of heat transfer between two adjacent parts of a body due to their temperature difference.
Condensation is the process where water vapor becomes liquid.