Q$\mathrm{.}1$ Consider the cyclic process given in the figure:

$$ ab and cd are adiabatic processes, while, bc and da are constant volume processes.

a$)$ What is the work done by the system along da and bc $?$

If the work done along cd is w$,$ what is the change in internal energy when the system expands from c to d$?$ What is the change in internal energy when the system is compressed from a to b$?$