Question

For free expansion of a gas in an adiabatic container which of the following is true?

• A. $Q=W=0$ and $\Delta U=0$
• B. $Q=0,W>0$ and $\Delta U=Q$
• C. $W=0,Q>0$ and $\Delta U=Q$
• D. $W=0,Q<0$ and $\Delta U=0$

Answer 1

The correct option is A $Q=W=0$ and $\Delta U=0$

In every adiabatic process Q = 0

In free expansion no work is done on or against the gas, $\therefore$W = 0

$△$U = Q + W

$\therefore$$△$ = 0

(A) : ANSWER , Q = W= 0 and $△$U = 0