Given below are two statements:
Statement I: If heat is added to a system, its temperature must increase.
Statement II: If positive work is done by a system in a thermodynamic process, its volume must increase.
In the light of the above statements, choose the correct answer from the options given below
Statement I: If heat is added to a system, its temperature must increase.
Statement II: If positive work is done by a system in a thermodynamic process, its volume must increase.
In the light of the above statements, choose the correct answer from the options given below
- (A)Statement I is true but Statement II is false
- (B)Both Statement I and Statement II are true
- (C)Both Statement I and Statement II are false
- (D)Statement I is false but Statement II is true✓ Correct
Answer: (D)
Solution
Statement I: by the first law of thermodynamics , heat added to a system need not raise its temperature, since the system may use that heat to do work while its internal energy, and therefore its temperature, remains unchanged or even falls, as in an isothermal expansion of an ideal gas. Thus Statement I is false. Statement II: the work done by a system is ; because the pressure is always positive, positive work requires , that is the volume must increase. Thus Statement II is true. Therefore Statement I is false but Statement II is true.
JEE Main · 2023 · 08 Apr 2023 · Shift 1 · Single correct option