Q. In adiabatic expansion
A) $\mathrm{\Delta}U = 0$
B) $\mathrm{\Delta}U =$ negative
C) $\mathrm{\Delta}U =$ positive
D) $\mathrm{\Delta}W =$ zero
Explanation
(b) In case of adiabatic expansion $\mathrm{\Delta}W =$ positive and $\mathrm{\Delta}Q = 0$
From FLOT $\mathrm{\Delta}Q = \mathrm{\Delta}U + \mathrm{\Delta}W \Rightarrow \mathrm{\Delta}U = - \mathrm{\Delta}W,\ i.e.,\mathrm{\Delta}U$ will be negative
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.