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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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A vertical glass jar is filled with water at 10∘C10^{\circ} {C}. It has one thermometer at the top and another at the bottom. The central region of the jar is gradually cooled. It is found that the bottom thermometer reads 4∘C4^{\circ} {C} earlier than the top thermometer. And the top thermometer reads 0∘C0^{\circ} {C} earlier than the bottom thermometer. This is because
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Correct option: D
Water expands when cooled from 40C4^0 {C} to 0∘C0^{\circ} {C}
Option D (Water expands when cooled from 40C4^0 {C} to 0∘C0^{\circ} {C}) is correct because water has maximum density at 4∘C4^{\circ} {C}, and it expands when cooled further, causing the colder water to rise.

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