When heat is supplied to a monoatomic gas,it expands at constant pressure. What fraction of the heat supplied is converted into work?

An ideal monoatomic gas expands at constant pressure. The work done by the gas on its environment is $200 \,J$, then the heat absorbed by the gas during the process is (in $\,J$)

The pressure $P$ of an ideal diatomic gas varies with its absolute temperature $T$ as shown in the figure. The molar heat capacity of the gas during this process is ........... $R$ [$R$ is the gas constant].

Which one of the following $p-V$ diagrams is correct for an isochoric process?

Which of the following graphs between pressure $(P)$ and volume $(V)$ correctly shows isochoric changes?

One mole of an ideal gas is contained within a cylinder by a frictionless piston and is initially at temperature $T$. The pressure of the gas is kept constant while it is heated and its volume doubles. If $R$ is the molar gas constant,the work done by the gas in increasing its volume is