Question

Which of the following statement about a thermodynamic process is wrong?

• A. For an adjabatic process $△E_{int}=-W$
• B. For a constant volume process $△E_{int}=+Q$
• C. For a cyclic process $△E_{int}=0$
• D. For free expansion of a gas $△E_{int}>0$

Answer 1

The correct option is D For free expansion of a gas $△E_{int}>0$

Solution:

In option A,For adiabatic process, $△Q=0$,

$\therefore △E_{int}=-W$

In option B, for constant volume process $W=0$

$\therefore △E_{int}=Q$

In option C, for constant volume process $E_{int}=0$

In option D, for free expansion as the gas is expanding freely so change in volume is zero. So, $W=0$

$\therefore △E_{int}=Q$

Hence,correct option is D.