What is the nature of the change in internal energy for the following three thermodynamic processes shown in the figure?

One mole of an ideal monoatomic gas is taken round the cyclic process $MNOM$. The work done by the gas is (in $p_0 V_0$)

An ideal gas is taken through the cycle $ABCA$ as shown in the $PV$ diagram. What is the total work done during the cycle?

What is a cyclic process? Write a note on it.

The $P-V$ diagram of an ideal gas is as shown. Find the work done by the gas in the $ABCD$ process.

Three different processes that can occur in an ideal monoatomic gas are shown in the $P$ vs $V$ diagram. The paths are labelled as $A \rightarrow B, A \rightarrow C$ and $A \rightarrow D$. The change in internal energies during these processes are taken as $E_{AB}, E_{AC}$ and $E_{AD}$ and the work done as $W_{AB}, W_{AC}$ and $W_{AD}$. The correct relation between these parameters is: