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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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A barometer with a brass scale correct at 0∘C0^\circ C reads 70 cm of mercury on a day when the air temperature is 40∘C40^\circ C. The correct reading at 0∘C0^\circ C is [Coefficient of real expansion of mercury is 0.00018/∘C0.00018/^\circ C and the coefficient of linear expansion of brass is 0.000018/∘C0.000018/^\circ C ]
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Correct option: B
69.5 cm
Option B (69.5 cm) is correct because it accounts for the thermal expansion of both the mercury and the brass scale to determine the correct reading at 0°C.

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