A polyatomic gas $\left( {\gamma = \frac{4}{3}} \right)$ is compressed to $\frac{1}{8}$ of its volume adiabatically. If its initial pressure is ${P_o}$, its new pressure will be

Initial pressure and volume of a gas are $P$ and $V$ respectively. First it is expanded isothermally to volume $4V$ and then compressed adiabatically to volume $V$ . The final pressure of gas will be (given $\gamma = 3/2$ ) 

Melting of ice is an adiabatic or an isothermal process ?

Following figure shows $P-T$ graph for four processes $A, B, C$ and $D$. Select the correct alternative.

What is the change in temperature when work done by gas in an adiabatic process ?