1) Mathematical equation of first law of thermodynamics for isochoric process is A) $\triangle U= q_{v}$ B) $-\triangle U= qv$ C) q=-W D) $\triangle U= W$ Answer: Option AExplanation:For an isochoric process, $\triangle $ V=0 In this process, the first law of thermodynamics q= $\triangle U-W$ q= $\triangle U-p \triangle V$ As $\triangle V=0$ qV= $\triangle $U
