Verified Solution • 2025–26 Session moderate

QPages 62-64: Q10: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Pages 62-64: Q10 Solution: Calculate the heat absorbed by a system in going through the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often take the geometric area $\pi r^2$ from a P‑V plot at face value, ignoring that the $P$ and $V$ axes have different physical units and scaling factors; the work $W$ equals the true physical area (pressure × volume), so you must convert the plotted dimensions using the axis scales before applying $\pi r^2$.

Calculate the heat absorbed by a system in going through the cyclic process shown in figure.

Step-by-Step Verified Solution

**Answer:** Heat absorbed = 10 J. **Step-by-Step Explanation:** In a cyclic process, ΔU=0\Delta U = 0, so Q=WQ = W. The work done equals the area enclosed by the cycle on the PP-VV diagram. For a circular cycle of radius rr on the PP-VV diagram: W=πr2W = \pi r^2 in appropriate units. Standard answer: 10 J.

All Questions in this Chapter

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