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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediummultiple choice

A cylindrical metal rod $M$ stands on a table. A cylinder $L$ containing liquid also stands on it. Cylinder $L$ is made of a glass called "invar", which does not expand or contract with temperature. Room temperature is increased, with corresponding uniform increases in the temperatures of both systems. Both metal and liquid expand on heating.

Source diagram 79

Options:(select one or more)

Answer:

B, D

Solution:

For the metal,
$p = \frac{m g}{A}$
decreases as its base area expands.
For the liquid in a fixed-area vessel,
$p = \frac{m g}{A}$
stays unchanged.
Thus B and D hold.

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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