Question: Helium gas goes through a cycle $\mathrm{ABCDA}$ (consisting of two isochoric and two isobaric lines) as shown in figure. Efficiency of this cycle is nearly (Assume the gas to be close to ideal gas) :-
$12.5 \%$
$15.4 \%$
$9.1 \%$
$10.5 \%$
Correct Option: , 2
Solution:
