Question

Which is true for a cyclic process?

• A. \( \Delta E = 0 \)
• B. \( \Delta E = q - W \)
• C. \( q = W \)
• D. All of these

Hint:

Cyclic process $\Rightarrow$ initial state = final state $\Rightarrow$ \(\Delta E = 0\).

Answer 1

The Correct Option is A

Concept: In a cyclic process, the system returns to its initial state.

Step 1: Internal energy.
Since internal energy is a state function: \[ \Delta E = 0 \]

Step 2: First law.
\[ \Delta E = q - W \] This is always valid, but not specific to cyclic process.

Step 3: Conclusion.
Only the defining property of a cyclic process is: \[ \Delta E = 0 \]