MHT CET 2023 11th May Morning Shift | Heat and Thermodynamics Question 136 | Physics

Two spherical black bodies of radii '$$r_1$$' and '$$r_2$$' at temperature '$$\mathrm{T}_1$$' and '$$\mathrm{T}_2$$' respectively radiate power in the ratio $$1: 2$$ Then $$r_1: r_2$$ is

$$\frac{1}{2}\left(\frac{\mathrm{T}_2}{\mathrm{~T}_1}\right)^4$$

$$\frac{1}{\sqrt{2}}\left(\frac{\mathrm{T}_2}{\mathrm{~T}_1}\right)^2$$

$$2\left(\frac{\mathrm{T}_1}{\mathrm{~T}_2}\right)^4$$

$$2\left(\frac{T_1}{T_2}\right)^2$$

MHT CET 2023 11th May Morning Shift

MCQ (Single Correct Answer)

-0

The rate of flow of heat through a metal rod with temperature difference $$40^{\circ} \mathrm{C}$$ is $$1600 \mathrm{~cal} / \mathrm{s}$$. The thermal resistance of metal rod in $${ }^{\circ} \mathrm{C} \mathrm{s} / \mathrm{cal}$$ is

0.025

0.25

2.5

MHT CET 2023 11th May Morning Shift

MCQ (Single Correct Answer)

-0

If the temperature of a hot body is increased by $$50 \%$$, then the increase in the quantity of emitted heat radiation will be approximately

$$125 \%$$

$$200 \%$$

$$300 \%$$

$$400 \%$$

MHT CET 2023 11th May Morning Shift

MCQ (Single Correct Answer)

-0

A monoatomic gas at pressure '$$\mathrm{P}$$', having volume '$$\mathrm{V}$$' expands isothermally to a volume '$$2 \mathrm{~V}$$' and then adiabatically to a volume '$$16 \mathrm{~V}$$'. The final pressure of the gas is (Take $$\gamma=5 / 3$$ )

$$\mathrm{P} / 64$$

$$\mathrm{P} / 32$$

$$16 \mathrm{P}$$

$$32 \mathrm{P}$$

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