A cyclic process $ABCA$ is shown in $PT$ diagram. When presented on $PV$, it would be
If sink and source temperature of a refrigerator are $4^{\circ} C$ and $15^{\circ} C$ respectively. Then efficiency of refrigerator is
$P-V$ diagram of an ideal gas is as shown in figure. Work done by the gas in process $ABCD$ is
The efficiency of a carnot engine is $0.6$.It rejects total $20 \ J$ of heat. The work done by the engine is .... $J$
$P-V$ diagram of $2\,g$ of $He$ gas for $A \to B$ process is shown. What is the heat given to the gas ?
Compressed air in the tube of a wheel of a cycle at normal temperature suddenly starts coming out from a puncture. The air inside