Which of the following is a state function:-

A monatomic gas at a pressure $P$, having a volume $V$ expands isothermally to a volume $2V$ and then adiabatically to a volume $16V$. The final pressure of the gas is (take $\gamma =\frac{5}{3}$) 

A thermodynamic system undergoes cyclic process ABCDA as shown in fig. The work done by the system in the cycle is:-

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure,

The change in infernal enerqy of the gas during the transition is :

Figure below shows two paths that may be taken by a gas to go form a state $A$ to a state $C$.

In process $AB$, $400 \mathrm{J}$ of heat is added to the system and in process $BC$ $100 \mathrm{J}$ of heat is added to the system. The heat absorbed by the system in the process $AC$ will be :-