Q. The p-V diagram of a gas undergoing a cyclic process (ABCDA) is shown in the graph where p is in units of $Nm^{- 2}$ and V in $cm^{3}.$ Identify the incorrect statement.
A) 0.4 J work is done by the gas from A to B
B) 0.2 J of work is done on the gas from C and D
C) No work is done by the gas from B to C
D) Work is done by the gas in going from B to C and on the gas from D to A
Explanation
(d) The area under p-V diagram =work done
or $W = AD \times DC$
=$\left( 2 \times 10^{5} - 1 \times 10^{5} \right)Nm^{- 2} \times (4 - 2) \times 10^{- 6}m^{3}$
$= 1 \times 10^{5} \times 2 \times 10^{- 6}J = 0.2\ J$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.