Question

Which of the following variables is zero for a cyclic process?

(a) Work done

(b) Heat supplied

(c) Total heat + Total work

(d) Total heat – Total work

I have been asked this question in an online interview.

My doubt stems from Thermodynamic Processes in division Thermodynamics of Physics – Class 11

Answer 1

Right answer is (d) Total heat – Total work

The best I can explain: In a cyclic process, the starting position is the same as the ending position. So, the change in all state variables is zero. So the net change in internal energy is zero. ΔU = ΔQ – ΔW = 0.