Question

Which of the following statement(s) is/ are true about convection?
1. Convection requires a medium for transfer of heat.
2. In liquids, the predominant mode of heat transfer is convection.
3. In convection, heat flows from the cold end to the hot end of the substance.

• A. 1 and 3 only
• B. 1 and 2 only
• C. 2 and 3 only
• D. 1, 2 and 3

Answer 1

The correct option is B 1 and 2 only

Convection primarily occurs in liquids and gases. Convection occurs by the movement of particles from high temperature to low temperature.
For example, while heating water, the lowermost layer gains heat and rises up. Cold water from the top layer rushes to occupy its place and in this way whole water is heated.
Hence, convection requires a material medium and it is the predominant mode of heat transfer in liquids and gases.