Q. In the diagram (i) to (iv) of variation of volume with changing pressure is shown. A gas is taken along the path $ABCD$. The change in internal energy of the gas will be
A) Positive in all cases (i) to (iv)
B) Positive in cases (i), (ii) and (iii) but zero in (iv) case
C) Negative in cases (i), (ii) and (iii) but zero in (iv) case
D) Zero in all four cases
Explanation
(d) In all given cases, process is cyclic and in cyclic process $\mathrm{\Delta}U = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.