MHT CET 2021 22th September Evening Shift | Heat and Thermodynamics Question 78 | Physics

The emissive power of sphere of area $$0.04 \mathrm{~m}^2$$ is $$0.7 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$. The amount of heat radiated in 20 second is

$$2.8 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$

$$0.28 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$

$$5.6 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$

$$0.56 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

The rate of flow of heat through a copper rod with temperature difference $$28^{\circ} \mathrm{C}$$ is $$1400 \mathrm{~cal} \mathrm{~s}^{-1}$$. The thermal resistance of copper rod will be

$$0.05 \frac{{ }^{\circ} \mathrm{C} \mathrm{s}}{\mathrm{cal}}$$

$$0.02 \frac{{ }^{\circ} \mathrm{C} \mathrm{s}}{\mathrm{cal}}$$

$$5 \frac{{ }^{\circ} \mathrm{C} \mathrm{s}}{\mathrm{cal}}$$

$$2 \frac{{ }^{\circ} \mathrm{Cs}}{\text { cal }}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

The change in internal energy of the mass of a gas, when the volume changes from '$$\mathrm{V}$$' to '$$2 \mathrm{~V}$$' at constant pressure 'P' is ($$\gamma=$$ Ratio of Cp to Cv)

$$\frac{\mathrm{PV}}{(\gamma-1)}$$

$$\frac{\mathrm{P}}{(\gamma-1)}$$

$$\frac{\gamma \mathrm{PV}}{(\gamma-1)}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

If the pressure of an ideal gas is decreased by $$10 \%$$ isothermally, then its volume will

decrease by $$8 \%$$

decrease by $$9 \%$$

increase by $$8 \%$$

increase by $$11.1 \%$$

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