A) Conduction
B) Convection
C) Radiation
D) None of the above
Correct Answer: B
Solution :
[a] Conduction is the process of transmission of heat in a body from the hotter part to the colder part without any bodily movement of constituent atoms or molecules of the body. [b] In convection, the heated lighter particles move upwards and colder heavier particles move downward to take their place. This depends on weight and hence, on gravity. [c] Radiation is the process of transmission of heat from one body to another body through electromagnetic waves even through vacuum, irrespective of their temperatures. Hence, choice [b] is correct.
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