In the cyclic process $\mathrm{ABCDA}$ shown in the figure, consider the following statements.

I. Area $ABCD=$ Work done on the gas

II. Area $ABCD=$ Net heat absorbed

III. Change in the internal energy in cycle $=0$

Which of these are correct?

Carbon monoxide is carried around a closed cycle $abca$ in which $bc$ is an isothermal process as shown in the figure. The gas absorbs $7000 \mathrm{J}$ of heat as its temperature increases from $300 \mathrm{K}$ to $1000 \mathrm{K}$ in going from $a$ to $b$. The quantity of heat rejected by the gas during the process $ca$ is approximately

When a system is taken from state $i$ to a state $f$ along path $iaf$, $Q=50 \mathrm{J}$ and $W=20 \mathrm{J}$. If $W=-13 \mathrm{J}$ for the curved return path $fi, Q$ in this path is

The $p-V$ diagram of a system undergoing thermodynamic transformation is as shown in figure. The work done by the system in going from $A\to B\to C$ is $30 \mathrm{J}$ and $40 \mathrm{J}$ heat is given to the system. The change in internal energy between $A$ and $C$ is

$p-V$ diagram of a cyclic process $ABCA$ is as shown in figure. Choose the correct statement.

A sample of an ideal gas is taken through a cycle as shown in figure. It absorbs $50 \mathrm{J}$ of energy during the process $AB$, no heat during $BC$, rejects $70 \mathrm{J}$ during $CA$.$40 \mathrm{J}$ of work is done on the gas during $BC$. Internal energy of gas at $A$ is $1500 \mathrm{J},$ the internal energy at $C$ would be

An ideal mono atomic gas is taken around the cycle as shown in $p-V$ diagram. The work done during the cycle is given by