MHT CET Medical202621 April 2026Morning ShiftPhysicsThermodynamicsActual
For a cyclic thermodynamic process
Options
- AQ = -W and U 0
- BQ = 0 and U = 0
- CQ 0, U 0
- DQ = W and U = 0
Correct answer
D. Q = W and U = 0
Step-by-step solution
For a cyclic thermodynamic process, the initial and final states of the system are the same. Since internal energy U is a state function, the change in internal energy over a complete cycle is zero, so U = 0 . According to the first law of thermodynamics, Q = U + W . Substituting U = 0 , we get Q = W . Therefore, for a cyclic process, Q = W and U = 0 . Answer: Q = W and U = 0