Question

In a cyclic process, which of the following statement is correct?

• A. Change in internal energy is not zero.
• B. The system returns to its initial state and it is is reversible.
• C. The total heat absorbed by the system is not equal to work done by the system.
• D. Change in internal energy is zero.

Answer 1

The correct option is D Change in internal energy is zero.

In a cyclic process, the system returns to its initial state and but not a reversible. And the change in internal energy must be zero.

$\Delta U=0$

From 1st law of thermodynamics,

$\Delta Q=\Delta U+\Delta W$

$\Delta Q=0+\Delta W$

$\Delta Q=\Delta W$

The total heat absorbed by the system is equal to the work done by the system.

The correct option is D.