Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumsingle choice

Passage / Comprehension

One kilogram of a substance (initially solid at $0^{\circ} C$ ) is supplied heat at a constant rate of $2 kcal/min$ . Its solid linear expansion coefficient is $α = 4 \times 1 0^{- 6}^{\circ} C^{- 1}$ . Its temperature varies with time as shown.

Source diagram 90

The percentage change in the volume of the solid in the first $150 s$ is:

Options:

Answer:

Solution:

In
$150 s = 2.5 min$
the temperature rises by $10^{\circ} C$

$\frac{Δ V}{V} \approx 3 α Δ T$

$\frac{Δ V}{V} = 3 \times 4 \times 1 0^{- 6} \times 10$

$\frac{Δ V}{V} = 1.2 \times 1 0^{- 4}$

$Percentage change = 0.012%$

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

⏱ 2mℹ️ Source: QB

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