An indicator diagram is a ...........

In the following figures $(a)$ to $(d)$,the variation of volume with change of pressure is shown. The gas is taken along the path $A B C D A$. The change in internal energy of the gas will be .......

One mole of an ideal monatomic gas undergoes a cyclic process as shown in the $P-V$ diagram. The total heat supplied to the gas is: (in $\text{ J}$)

$A$ thermodynamic system is taken from state $A$ to $B$ along $ACB$ and is brought back to $A$ along $BDA$ as shown in the $PV$ diagram. The net work done during the complete cycle is given by the area

$A$ thermodynamic system is taken from an original state $D$ to an intermediate state $E$ by the linear process shown in the figure. Its volume is then reduced to the original volume from $E$ to $F$ by an isobaric process. The total work done by the gas from $D$ to $E$ to $F$ will be $......J$

The work done by a gas as it is taken in a cyclic process (shown in the graph) is (in $PV$)