Answer: 1.
- A 0
- B 1
- C R/Cv
- D 1/gamma
Correct answer: B. 1
Explanation: In isothermal process for ideal gas: delta U = 0. Q = W. Ratio W/Q = 1.
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.