Q. If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then
A) Q = 0
B) W = 0
C) Q = W = 0
D) E = 0
Explanation
[Solution from source] Internal energy is a state function, so after a complete cycle its change E is zero. From Q = E + W this gives Q = W, but neither heat nor work need be zero: a heat engine running in a cycle does net work. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.