Answer: No heat is exchanged.
- A No work is done
- B Temperature is constant
- C No heat is exchanged
- D Volume is constant
Correct answer: C. No heat is exchanged
Explanation: Adiabatic process: Q = 0 (no heat exchange with surroundings). First law: delta U = -W.
The Carnot cycle alternates two isothermal steps (heat absorbed at TH, released at TC) with two adiabatic steps (no heat exchange); the enclosed loop area equals the net work output, and η = 1−TC/TH is the maximum possible efficiency between those two temperatures.
Concept context
Laws of thermodynamics, heat engines, entropy, and gas processes.