Question

In which of the following processes, the net work done is Zero?

• A. Cyclic
• B. Adiabatic
• C. Isochoric
• D. Free Expansion

Answer 1

Answer: (C), (D)

Free Expansion

Option C and D are correct:

Explanation of correct options:

1. For the simple system, any heat energy transferred to the system is absorbed as internal energy.
2. In free expansion, no external pressure is supplied to the gas.
3. In absence of external pressure, gas expands by its own.
4. Thus, due to zero external pressure and heat transfer, work done is zero.

Explanation of incorrect options:

Option A:

1. If the cycle goes clockwise, the system does work.
2. If the cycle goes anticlockwise, then the work is done on the system every cycle

Option B: Work done is depends on the pressure and volume.

So, the correct answer is option C and D.