Verified Solution • 2025–26 Session moderate

QPage 60: Q6: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 60: Q6 Solution: When we rub our hands they become warm. Have we supplied heat…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often conflate the everyday term 'heat' (sensation of warmth) with the thermodynamic definition of heat ($Q$), which strictly requires energy transfer due to a temperature difference. You must recognize that frictional warming is a result of work ($W$) done against dissipative forces, not heat flow from an external source.

When we rub our hands they become warm. Have we supplied heat to the hands?

Step-by-Step Verified Solution

**Answer:** No, we have not supplied heat to our hands. **Step-by-Step Explanation:** When we rub our hands, **work** is done against friction. This mechanical work is converted into internal energy (heat) of the hands, raising their temperature. No external heat source is involved; the warming is due to the conversion of work into internal energy [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