In the following figures (1) to (4), variation of volume by change of pressure is shown. A gas is taken along the path $\mathrm{ABCDA}.$ The change in internal energy of the gas will be

(1)(2)(3)(4)

An ideal gas changes from state $a$ to state $b$ as shown in figure. What is the work done by the gas in the process?

In the cyclic process shown on the $P-V$ diagram the magnitude of the work done is

A fixed mass of ideal gas undergoes changes of pressure and volume starting at $L,$ as shown in figure.

Which of the following is correct :

A fixed mass of gas undergoes the cycle of changes represented by $PQRSP$ as shown in Figure. In some of the changes, work is done on the gas and in others, work is done by the gas. In which pair of the changes work is done on the gas?

Consider two processes on a system as shown in figure. The volumes in the initial states are the same in the two processes and the volumes in the final states are also the same. Let $\mathrm{\Delta }{W}_1$ and $\mathrm{\Delta }{W}_2$ be the work done by the system in the processes $A$ and $B$, respectively.

Find work done by the gas in the process shown in figure.