Question

In a given process for an ideal gas, $dW=0$ and $dQ<0$, then for the gas:

• A. The volume will decrease
• B. The volume will increase
• C. The pressure will remain constant
• D. The internal energy will decrease

Answer 1

The correct option is D The internal energy will decrease

From the First law of thermodynamics,
$dU=dQ+dW$
$\because dQ<0and\because dW=0\Rightarrow dU<0$
Hence, internal energy decreases.