MHT CET 2023 14th May Morning Shift | Heat and Thermodynamics Question 10 | Physics

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)

-0

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)

-0

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

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

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

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

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

MHT CET 2023 13th May Evening Shift

MCQ (Single Correct Answer)

-0

A sample of oxygen gas and a sample of hydrogen gas both have the same mass, same volume and the same pressure. The ratio of their absolute temperature is

$$1: 4$$

$$4: 1$$

$$1: 16$$

$$16: 1$$

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