Question

A thermodynamic system is compressed adiabatically, then its temperature

• A. becomes zero.
• B. remains constant.
• C. increases.
• D. decreases.

Hint:

In a cycle the internal energy returns to its initial value, so work equals net heat.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Internal energy is a state function. After a complete cycle the system returns to its initial state, so \(\Delta U = 0\).

Step 2: First law:
\(Q = \Delta U + W = W\). So the work done by the system equals the net heat given to the system.

Step 3: Other options:
It cannot be zero in general (a heat engine does work in each cycle), it cannot exceed the heat given (that would violate energy conservation), and it is not independent of heat.

Final Answer:
Work done equals the heat given to the system, option (B). \[ \boxed{W = Q} \]