MHT CET 2023 14th May Morning Shift | Heat and Thermodynamics Question 9 | Physics

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)

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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?

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

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

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

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

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

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A sphere, a cube and a thin circular plate all made of same material and having the same mass are heated to same temperature of $$200^{\circ} \mathrm{C}$$. When these are left in a room.

the sphere reaches room temperature fast

the cube reaches room temperature fast

the circular plate reaches room temperature fast

all will reach the room temperature simultaneously

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

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The efficiency of a heat engine is '$$\eta$$' and the coefficient of performance of a refrigerator is '$$\beta$$'. Then

$$\eta=\frac{1}{\beta}$$

$$\eta=\frac{1}{\beta+1}$$

$$\eta \beta=\frac{1}{2}$$

$$\eta=\frac{1}{\beta-1}$$

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