An ideal gas undergoes a thermodynamics cycle as shown in figure. Which of the following graphs represents the same cycle?

In the $P-V$ diagram shown, the gas does $5\,J$ of work in isothermal process $ab$ and $4\,J$ in adiabatic process $bc$ .   .... $J$ will be the change in internal energy of the gas in straight path $c$ to $a$ ?

An ideal gas expands isothermally from a volume $V_1$ to $V_2$ and then compressed to original volume $V_1$ adiabatically. Initial pressure is $P_1$ and final pressure is $P_3$. The total work done is $W$. Then

In the indicator diagram (in figure), net amount of work done will be

An ieal heat engine operates on Carnot cycle between $227\,^oC$ and $127\,^oC$. It absorbs $6 \times 10^4\, cal$ at the higher temperature. The amount of heat converted into work equals to

Initial pressure and volume of a gas are $P$ and $V$ respectively. First it is expanded isothermally to volume $4\ V$ and then compressed adiabatically to volume $V.$ The final pressure of gas will be (given $\gamma = 3/2)$