Statement A convection involves flow of matter within a fluid due to unequal temperatures of its parts.
Statements B A hot bar placed under a running tap water loses heat due to effect of convection with in water.
Statement C Heat transfer always involves temperature different between two systems.
Identify the correct option.

Options

A. A,B ,C are true
B. Only A and C are true
C. Only A and B are true
D. Only B and C are true

Answer

B

Explanation

(A) Convection involved flow of matter within a fluid due to heat transferred from one point to another by the actual motion of matter from a ragion of high temperature to a region of lower temperature.
(B) A hot bar placed under a running top water loses heat with in water. The warmer water rises up , thess leads to circulation of heat from bar to water by the process of convection .
However , heat will be transferred inside the molecules of the bar also by conduction. Thus, the heat transfer when hot bar placed under a running top water is due to both conduction and convection.
(C ) Heat can only be transferred between two system due to their temperature difference in the form of raditious, molecular vibrations, molecular displacement etc.