Question: What is the significance of the Carnot cycle in thermodynamics?

Options:

1. It is the most efficient cycle possible.
2. It is a practical engine design.
3. It operates at constant pressure.
4. It uses a real gas.

Correct Answer: It is the most efficient cycle possible.

Solution:

The Carnot cycle is significant because it represents the maximum possible efficiency that any heat engine can achieve operating between two temperatures.