Question

In adiabatic compression, which of the following is true?

$($Symbols have usual meaning$)$

• A. $\Delta Q=0$
• B. $\Delta U<0$
• C. $W=0$
• D. Both $\left(A\right)$ and $\left(B\right)$

Answer 1

The correct option is A $\Delta Q=0$

In adiabatic compression,

$\Delta Q=0$

Also work done by the gas $W$ is negative, hence from first law of thermodynamics,

$\Delta Q=\Delta U+W\Rightarrow \Delta U=-W>0$