Verified Solution • 2025–26 Session moderate

QPage 60: Q13: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 60: Q13 Solution: When we stir a liquid vigorously, it becomes warm. Is it a…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often treat stirring as a reversible mechanical action, but the viscous friction in the liquid creates entropy and converts work into heat irreversibly. Because the generated heat cannot be fully recovered as useful work, the stirring process is not reversible.

When we stir a liquid vigorously, it becomes warm. Is it a reversible process?

Step-by-Step Verified Solution

**Answer:** No, it is not a reversible process. **Step-by-Step Explanation:** Stirring a liquid converts work into internal energy (heat), raising its temperature. To reverse the process, you would need to extract heat and convert it back entirely into work, which is impossible by the second law. Hence, the process is **irreversible** [citation:8][citation:10].

All Questions in this Chapter

QPage 60: Q1 QPage 60: Q2 QPage 60: Q3 QPage 60: Q4 QPage 60: Q5 QPage 60: Q6 QPage 60: Q7 QPage 60: Q8 QPage 60: Q9 QPage 60: Q10 QPage 60: Q11 QPage 60: Q12 QPage 60: Q13 QPage 60: Q14 QPage 60: Q15 QPage 61: Q1 QPage 61: Q2 QPage 61: Q3 QPage 61: Q4 QPage 61: Q5 QPage 61: Q6 QPage 61: Q7 QPage 61: Q8 QPage 61: Q9 QPage 61: Q10 QPage 61: Q11 QPage 62: Q12 QPage 62: Q13 QPage 62: Q14 QPages 62-64: Q1 QPages 62-64: Q2 QPages 62-64: Q3 QPages 62-64: Q4 QPages 62-64: Q5 QPages 62-64: Q6 QPages 62-64: Q7 QPages 62-64: Q8 QPages 62-64: Q9 QPages 62-64: Q10 QPages 62-64: Q11 QPages 62-64: Q12 QPages 62-64: Q13 QPages 62-64: Q14 QPages 62-64: Q15 QPages 62-64: Q16 QPages 62-64: Q17 QPages 62-64: Q18 QPages 62-64: Q19 QPages 62-64: Q20 QPages 62-64: Q21 QPages 62-64: Q22

Related Learning Resources & Exam Preparation

Chapter Practice Bank
Practice all topic-wise questions from Laws of Thermodynamics
Reference Textbook Solutions
Explore complete chapter exercises for HC Verma: Concepts of Physics - Volume 2
Competitive PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring