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Question: Answered & Verified by Expert
Based on the first law of thermodynamics, which one of the following is correct?
ChemistryThermodynamics (C)KCETKCET 2011
Options:
  • A For an isothermal process, $Q=+W$
  • B For an isochoric process, $\Delta U=-Q$
  • C For an adiabatic process, $\Delta U=-W$
  • D For a cyclic process, $Q=-W$
Solution:
1028 Upvotes Verified Answer
The correct answer is: For a cyclic process, $Q=-W$
According to first law of thermodynamics,
$$
\Delta U=Q+W
$$
For cyclic process, change in internal energy
$$
\begin{aligned}
&=0 \\
Q &=-W
\end{aligned}
$$
$$
\therefore \quad Q=-W
$$

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