The efficiency of the cycle shown below in the figure (consisting of one isobar, one adiabat and one isotherm) is $50\%.$ The ratio, $x,$ between the highest and lowest temperatures attained in this cycle obeys (the working substance is a ideal gas):-

An ideal monoatomic gas is confined in a horizontal cylinder by a spring loaded piston (as shown in the figure). Initially the gas is at temperature $T_1$, pressure $P_1$ and volume $V_1$ and the spring is in its relaxed state. The gas is then heated very slowly to temperature $T_2$, pressure $P_2$and volume $V_2$. During this process, the piston moves out by a distance $x$. Ignoring the friction between the piston and the cylinder, the correct statement(s) is(are)

One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (where $V$ is the volume and $T$ is the temperature). Which of the statements below is (are) true ?

An ideal gas undergoes a cyclic process $abcda$ which is shown by pressure-density curve.