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QPage 11: Q11: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Page 11: Q11 Solution: If an automobile engine is overheated, it is cooled by pouring…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that dumping a large amount of cold water at once will cool the engine fastest, overlooking that the sudden temperature gradient induces thermal stress and can crack the metal; pour water slowly and keep the engine running so heat is removed uniformly and the coolant circulates.

If an automobile engine is overheated, it is cooled by pouring water on it. It is advised that the water should be poured slowly with the engine running. Explain the reason.

Step-by-Step Verified Solution

**Answer:** Water should be poured slowly with the engine running to avoid thermal shock and allow controlled cooling. **Step-by-Step Explanation:** Pouring cold water rapidly on a very hot engine causes sudden thermal contraction and stress, which can crack the block. Slow pouring allows gradual heat conduction. Keeping the engine running circulates coolant and distributes heat evenly, preventing localized cooling and thermal shock.

All Questions in this Chapter

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