Q. 6

Consider the following two statements.

A. If heat is added to a system, its temperature must increase.

B. If positive work in done by a system in a thermodynamic process, its volume must increase.

A. Both A and B are correct

B. A is correct but B is wrong

C. B is correct, but A is wrong

D. Both A and B are wrong

Answer :

Statement A: For an isothermal process (where the temperature remains constant) if heat is added to a system temperature will not increases. So, statement A is wrong.

Statement B: We know that,

Work done = force ×displacement

Volume = area ×displacement


Work done=pressure ×volume

Let change in the volume of system = ΔV = V2-V1

Pressure =P

Thus, work done by the system W at constant pressure


W>0 and positive only when V2 > V1.

Therefore, statement B is correct.

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