Which of the following relations is correct for an isochoric process?

An ideal diatomic gas is heated at constant pressure. The ratio of the work done to the heat supplied is

How much work is to be done in decreasing the volume of an ideal gas by an amount of $2.4 \times 10^{-4} \ m^3$ at normal temperature and constant normal pressure of $1 \times 10^5 \ N/m^2$ (in $J$)?

In a given process for an ideal gas,$dW = 0$ and $dQ < 0$. Then for the gas:

The state of a thermodynamic system changes from $(1)$ $(P_1, V)$ to $(2P_1, V)$ and $(2)$ $(P, V_1)$ to $(P, 2V_1)$. The work done during these two processes is respectively:

In an isobaric process,