In the given $P-V$ diagram, if temperature at $A$ is $400 K,$ then maximum temperature during the process $AB,$ is_____$K.$

A given mass of ideal gas changes its state from $A$ to $B$ along three different paths $1,2$ and $3.$ If $Q_1,Q_2$ and $Q_3$ be the heat supplied to the gas along respective paths then

Figure shows $P~T$ diagram for $2$ moles of an ideal gas. The volume of the gas is nearly

The $P~V$ curve for $1$ mole of an ideal monoatomic gas during process $A\to B$ is shown in figure. The change in internal energy of the gas is