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Thermal Properties of Mat question bank (Physics)

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Q1.

Which of the following statements is true/correct?

(A)

During clear nights, the temperature rises steadily upward near the ground level

(B)

Newton's law of cooling, an approximate form of Stefan's law, is valid only for natural convection

(C)

The total energy emitted by a black body per unit time per unit area is proportional to the square of its temperature in the Kelvin scale

(D)

Two spheres of the same material have radii $1 \mathrm{~m}$ and $4 \mathrm{~m}$ and temperatures $4000 \mathrm{~K}$ and $2000 \mathrm{~K}$ respectively. The energy radiated per second by the first sphere is greater than that radiated per second by the second sphere

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Q2.

A composite slab consists of two materials having coefficient of thermal conductivity $K$ and $2 \mathrm{~K}$, thickness $\mathrm{x}$ and $4 \mathrm{x}$ respectively. The temperature of the two outer surfaces of a composite slab are $\mathrm{T}_2$ and $\mathrm{T}_1\left(\mathrm{~T}_2\gt \mathrm{T}_1\right)$. The rate of heat transfer through the slab in a steady state is $\left[\frac{\mathrm{A}\left(\mathrm{T}_2-\mathrm{T}_1\right) \mathrm{K}}{\mathrm{x}}\right] \cdot \mathrm{f}$ where ' $\mathrm{f}$ ' is equal to

(A)

$1$

(B)

$\frac{2}{3}$

(C)

$\frac{1}{2}$

(D)

$\frac{1}{3}$

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