Verified Solution • 2025–26 Session moderate

QPage 11: Q10: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Page 11: Q10 Solution: A tightly closed metal lid of a glass bottle can be opened more …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think heating the metal lid only makes it larger outward, tightening the grip, and overlook that the lid’s inner diameter also expands—more than the glass neck—so the interference fit decreases. Remember to compare the relative linear expansions of both contacting surfaces, not just the outer size of the metal.

A tightly closed metal lid of a glass bottle can be opened more easily if it is put in hot water for some time. Explain.

Step-by-Step Verified Solution

**Answer:** The metal lid expands more than the glass when heated, making it easier to open. **Step-by-Step Explanation:** When the bottle is placed in hot water, both the metal lid and glass neck expand. The coefficient of linear expansion of metal is much larger than that of glass. Hence the lid expands more, loosening its grip on the neck.

All Questions in this Chapter

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