Q 11-11-018NEETJEE MainEasy
$200$ J of heat is supplied to a gas, and the gas does $80$ J of work on its surroundings. The change in its internal energy is
Answer: (A) $120$ J
Concept. First law: $\Delta U = Q - W$.
Step 1. Substitute. $200 - 80 = 120$ J.
Answer. $120$ J (Option A).
Solution by Sreeraj P, M.Sc Physics