KCET · Chemistry · Thermodynamics (C)
Based on the first law of thermodynamics, which one of the following is correct?
- 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, \(Q=-W\)
Answer & Solution
Correct Answer
(D) For a cyclic process, \(Q=-W\)
Step-by-step Solution
Detailed explanation
According to first law of thermodynamics,
\[
\Delta U=Q+W
\]
For cyclic process, change in internal energy
\[
\begin{aligned}
&=0 \\
Q &=-W
\end{aligned}
\]
\[
\therefore \quad Q=-W
\]
\[
\Delta U=Q+W
\]
For cyclic process, change in internal energy
\[
\begin{aligned}
&=0 \\
Q &=-W
\end{aligned}
\]
\[
\therefore \quad Q=-W
\]
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