A barometer made of a very narrow tube (see fig.) is placed at normal temperature and pressure. The coefficient of volume expansion of mercury is 0.00018/ ∘ C and that of the tube is negligible. The temperature of mercury in the barometer is now raised by 1°C but the temperature of the atmosphere does not change. Then

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Thermal Properties of Matter - Thermal Expansion Question with Solution | TestHub

Thermal Properties of MatterThermal ExpansionThermal StressMedium3 minCT49

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A barometer made of a very narrow tube (see fig.) is placed at normal temperature and pressure. The coefficient of volume expansion of mercury is $0.00018/^{\circ} C$ and that of the tube is negligible. The temperature of mercury in the barometer is now raised by 1°C but the temperature of the atmosphere does not change. Then

CT49 diagram

Options:

Answer:

Solution:

Atmospheric pressure remains unchanged, but mercury density decreases.

For p=ρgh the height therefore increases, so statement 1 is false and statement 2 true.

Stream:JEESubject:Thermal Properties of MatterTopic:Thermal ExpansionSubtopic:Thermal Stress

⏱ 3mℹ️ Source: CT49

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