MHT CET 2023 14th May Morning Shift | Heat and Thermodynamics Question 7 | Physics

A sphere and a cube, both of copper have equal volumes and are black. They are allowed to cool at same temperature and in same atmosphere. The ratio of their rate of loss of heat will be

$$1: 1$$

$$\left(\frac{\pi}{6}\right)^{\frac{2}{3}}$$

$$\left(\frac{\pi}{6}\right)^{\frac{1}{3}}$$

$$\frac{4 \pi}{3}: 1$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

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A body is said to be opaque to the radiation if (a, r and t are coefficient of absorption, reflection and transmission respectively)

$$\mathrm{t}=0$$ and $$\mathrm{a}+\mathrm{r}=1$$

$$\mathrm{a}=\mathrm{r}=\mathrm{t}$$

$$t \neq 0$$

$$\mathrm{a}=0, \mathrm{r}=1, \mathrm{t}=1$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

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In a thermodynamic system, $$\Delta U$$ represents the increases in its internal energy and dW is the work done by the system then correct statement out of the following is

$$\Delta \mathrm{U}=\mathrm{dW}$$ is an isothermal process

$$\Delta \mathrm{U}=-\mathrm{dW}$$ is an adiabatic process

$$\Delta \mathrm{U}=-\mathrm{dW}$$ is an isothermal process

$$\Delta \mathrm{U}=\mathrm{dW}$$ is an adiabatic process

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

-0

The temperature of a gas is $$-68^{\circ} \mathrm{C}$$. To what temperature should it be heated, so that the r.m.s. velocity of the molecules be doubled?

$$357^{\circ} \mathrm{C}$$

$$457^{\circ} \mathrm{C}$$

$$547^{\circ} \mathrm{C}$$

$$820^{\circ} \mathrm{C}$$

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