An ideal gas is taken in a cylinder at pressure ${\mathrm{p}}_0$, volume ${\mathrm{V}}_0$ and temperature ${\mathrm{T}}_0$. It is taken an isochoric process till its pressure becomes $4{\mathrm{p}}_0$. It is now isothermally expanded to get the original pressure. Finally, the gas is isobarically compressed to its original volume ${\mathrm{V}}_0$. What is the temperature in the isothermal part of the process?

A gas has been subjected to isochoric-isobaric processes $1-2-3-4-1$ (see figure). Plot this process on $\mathrm{T}-\mathrm{V}$ and $\mathrm{P}-\mathrm{T}$ diagrams.

A gas has been subjected to an isothermal-isochoric cycle $1-2-3-4-1$ (see figure). Represent the same cycle on $\mathrm{P}-\mathrm{V}$ and $\mathrm{P}-\mathrm{T}$ diagrams.

In the pressure-volume diagram given below, the isochoric, isothermal and isobaric parts respectively, are