1) The first law of thermodynamics for isothermal process is A) q=-W B) $\triangle U= W$ C) $\triangle U= q_{v}$ D) $\triangle U= -q_{v}$ Answer: Option AExplanation:According to firsr law of thermodynamics $\triangle U= q+w$ where, $\triangle U$ = internal energy q= Heat, w= work done For isothermal process, $\triangle T$=0 , $\triangle U$=0 q=-w
