Q. If gas, at constant temperature and pressure expands then its
A) Entropy increases and then decreases
B) Internal energy increases
C) Internal energy remains the same
D) Internal energy decreases
Explanation
(c)
Internal energy of a gas depends upon its pressure and temperature. Thus, if a gas expands at constant temperature and pressure, then its internal energy remains same.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.