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  4. Assertion In adiabatic expansion the product of p and V always decreases. Reason In adiabatic expansion process, work is done by the gas at the cost of internal energy of gas.

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Q. Assertion In adiabatic expansion the product of $p$ and $V$ always decreases.
Reason In adiabatic expansion process, work is done by the gas at the cost of internal energy of gas.

AIIMSAIIMS 2017

Solution:

In adiabatic expansion $\Delta Q=0$
$W=+$ ve, $\Delta U=-$ ve
$\therefore U, T$ or product of $p V$ will decrease because
$U \propto T \propto p V$