1. A system goes from A to B via two processes I and II as shown in figure. If

ΔU₁ and ΔU₂ are the changes in internal energies in the processes I and II respectively, then

(a) ΔU_II  > ΔU_I 

(b) ΔU₁ < ΔU₂

(c) ΔU₁ = ΔU₂

(d)  Relation between ΔU_I  and ΔU_II can not be determined

Ans. (c) As internal energy is a point function therefore change in internal energy does not depends upon the path followed i.e. ΔU₁ = ΔU₂

(158)