Question

For cyclic process which of the following quantity is zero?

• A. $\Delta V$
• B. $\Delta U$
• C. $W$
• D. $\Delta Q$

Answer 1

The correct option is B $\Delta U$

Internal energy$\left(U\right)$ is a function of temperature only.

Thus it is a state function, i.e. its value depends only upon the state it is in, not on the process through which it reached that state.

A cyclic process ends at the state where it started.

Thus, there is no change in state functions in a cyclic process, and hence $\Delta U=0$.