MHT CET 2021 21th September Evening Shift | Heat and Thermodynamics Question 84 | Physics

What is the ratio of the velocity of sound in hydrogen $$\left(\gamma=\frac{7}{5}\right)$$ to that in helium $$\left(\gamma=\frac{5}{3}\right)$$ at the same temperature? (Molecular weight of hydrogen and helium is 2 and 4 respectively.)

$$\frac{\sqrt{42}}{5}$$

$$\frac{5}{\sqrt{42}}$$

$$\frac{\sqrt{21}}{5}$$

$$\frac{5}{\sqrt{21}}$$

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

Equal volumes of two gases are kept in different containers having densities in the ratio 1 : 16. They exert equal pressures on the wall of their respective containers. Then the ratio of their r.m.s. velocities is

16 : 1

1 : 8

4 : 1

1 : 12

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

In thermodynamics, for an isochoric process, which one of the following statement is INCORRECT?

Energy exchanged is used to do work and also to change internal energy.

No work is done in the process.

It is a constant volume process.

Temperature of the system changes during the process.

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

If '$$\mathrm{E}$$' is the kinetic energy per mole of an ideal gas and '$$\mathrm{T}$$' is the absolute temperature, then the universal gas constant is given as

$$\frac{2 \mathrm{~T}}{3 \mathrm{E}}$$

$$\frac{2 \mathrm{E}}{3 \mathrm{~T}}$$

$$\frac{3 \mathrm{~T}}{2 \mathrm{E}}$$

$$\frac{3 \mathrm{E}}{2 \mathrm{~T}}$$

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