In the $P-V$ diagram shown in figure $ABC$ is a semicircle. The work done in the process $ABC$ is

An ideal gas is taken through the cycle $A → B → C → A$, as shown in the figure. If the net heat supplied to the gas in the cycle is $5 \ J$, the work done by the gas in the process $C → A$ is ……. $J$

One mole of a gas obeying the equation of state $P(V-b)=R T$ is made to expand from a state with coordinates $\left(P_{1}, V_{1}\right)$ to a state with $\left(P_{2}, V_{2}\right)$ along a process that is depicted by a straight line on a $P-V$ diagram. Then, the work done is given by

In the following figures heat is absorbed by the gas

Choose the correct statement for processes $A$  & $B$ shown in figure.