MHT CET 2023 12th May Evening Shift | Heat and Thermodynamics Question 120 | Physics

Compare the rate of loss of heat from a metal sphere at $$627^{\circ} \mathrm{C}$$ with the rate of loss of heat from the same sphere at $$327^{\circ} \mathrm{C}$$, if the temperature of the surrounding is $$27^{\circ} \mathrm{C}$$. (nearly)

6.2

5.3

4.8

7.4

MHT CET 2023 12th May Evening Shift

MCQ (Single Correct Answer)

-0

The volume of a metal block increases by $$0.225 \%$$ when its temperature is increased by $$30^{\circ} \mathrm{C}$$. Hence coefficient of linear expansion of the material of metal block is

$$7.5 \times 10^{-5} /{ }^{\circ} \mathrm{C}$$.

$$6.75 \times 10^{-5} /{ }^{\circ} \mathrm{C}$$.

$$2.5 \times 10^{-5} /{ }^{\circ} \mathrm{C}$$.

$$1.5 \times 10^{-5} /{ }^{\circ} \mathrm{C}$$.

MHT CET 2023 12th May Evening Shift

MCQ (Single Correct Answer)

-0

A monoatomic ideal gas initially at temperature '$$\mathrm{T}_1$$' is enclosed in a cylinder fitted with massless, frictionless piston. By releasing the piston suddenly the gas is allowed to expand to adiabatically to a temperature '$$\mathrm{T}_2$$'. If '$$\mathrm{L}_1$$' and '$$\mathrm{L}_2$$' are the lengths of the gas columns before and after expansion respectively, then $$\frac{\mathrm{T}_2}{\mathrm{~T}_1}$$ is

$$\frac{\mathrm{L}_1}{\mathrm{~L}_2}$$

$$\frac{\mathrm{L}_2}{\mathrm{~L}_1}$$

$$\left(\frac{\mathrm{L}_1}{\mathrm{~L}_2}\right)^{2 / 3}$$

$$\left(\frac{\mathrm{L}_2}{\mathrm{~L}_1}\right)^{2 / 3}$$

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