At a given temperature the root mean square velocities of oxygen and hydrogen molecules are in the ratio

1.  16 : 1

2.  1 : 16

3.  4 : 1

4.  1 : 4

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The temperature of an ideal gas is increased from 120 K to 480 K. If at 120 K, the root mean square velocity of the gas molecules is v, at 480 K it becomes

1.  4v

2.  2v

3.  v/2

4.  v/4

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The value of densities of two diatomic gases at constant temperature and pressure are ${\mathrm{d}}_{1}$ and  then the ratio of the speed of sound in these gases will be :

1. ${\mathrm{d}}_{1}{\mathrm{d}}_{2}$

2. $\sqrt{{\mathrm{d}}_{2}/{\mathrm{d}}_{1}}$

3. $\sqrt{{\mathrm{d}}_{1}/{\mathrm{d}}_{2}}$

4. $\sqrt{{\mathrm{d}}_{1}{\mathrm{d}}_{2}}$

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

By what factor the r.m.s. velocity will change, if the temperature is raised from 27°C to 327°C

1.  $\sqrt{2}$

2.  $2$

3.  $2\sqrt{2}$

4.  $1$

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

At a given temperature if ${\mathrm{V}}_{\mathrm{rms}}$ is the root mean square velocity of the molecules of a gas and ${\mathrm{V}}_{\mathrm{s}}$ the velocity of sound in it, then these are related as $\left(\mathrm{\gamma }=\frac{{\mathrm{C}}_{\mathrm{P}}}{{\mathrm{C}}_{\mathrm{v}}}\right)$

1. ${\mathrm{V}}_{\mathrm{rms}}={\mathrm{V}}_{\mathrm{s}}$

2. ${\mathrm{V}}_{\mathrm{rms}}=\sqrt{\frac{3}{\mathrm{\gamma }}}×{\mathrm{V}}_{\mathrm{s}}$

3. ${\mathrm{V}}_{\mathrm{rms}}=\sqrt{\frac{\mathrm{\gamma }}{3}}×{\mathrm{V}}_{\mathrm{s}}$

4. ${\mathrm{V}}_{\mathrm{rms}}=\left(\frac{3}{\mathrm{\gamma }}\right)×{\mathrm{V}}_{\mathrm{s}}$

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Let A and B the two gases and given :  where T is the temperature and M is molecular mass. If ${\mathrm{C}}_{\mathrm{A}}$ and ${\mathrm{C}}_{\mathrm{B}}$ are the r.m.s. speed, then the ratio $\frac{{\mathrm{C}}_{\mathrm{A}}}{{\mathrm{C}}_{\mathrm{B}}}$ will be equal to

1. 2

2. 4

3. 1

4. 0.5

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

For a gas at a temperature the root-mean-square velocity ${\mathrm{v}}_{\mathrm{rms}}$ , the most probable speed ${\mathrm{v}}_{\mathrm{mp}}$ , and the average speed ${\mathrm{v}}_{\mathrm{av}}$ obey the relationship

1. ${\mathrm{v}}_{\mathrm{av}}>{\mathrm{v}}_{\mathrm{rms}}>{\mathrm{v}}_{\mathrm{mp}}$

2. ${\mathrm{v}}_{\mathrm{rms}}>{\mathrm{v}}_{\mathrm{av}}>{\mathrm{v}}_{\mathrm{mp}}$

3. ${\mathrm{v}}_{\mathrm{mp}}>{\mathrm{v}}_{\mathrm{av}}>{\mathrm{v}}_{\mathrm{rms}}$

4. ${\mathrm{v}}_{\mathrm{mp}}>{\mathrm{v}}_{\mathrm{rms}}>{\mathrm{v}}_{\mathrm{av}}$

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If  and ${\mathrm{V}}_{\mathrm{O}}$ denote the root-mean square velocities of molecules of hydrogen, nitrogen and oxygen respectively at a given temperature, then

1. ${\mathrm{V}}_{\mathrm{N}}>{\mathrm{V}}_{\mathrm{O}}>{\mathrm{V}}_{\mathrm{H}}$

2. ${\mathrm{V}}_{\mathrm{H}}>{\mathrm{V}}_{\mathrm{N}}>{\mathrm{V}}_{\mathrm{O}}$

3. ${\mathrm{V}}_{\mathrm{O}}>{\mathrm{V}}_{\mathrm{N}}>{\mathrm{V}}_{\mathrm{H}}$

4. ${\mathrm{V}}_{\mathrm{O}}>{\mathrm{V}}_{\mathrm{H}}>{\mathrm{V}}_{\mathrm{N}}$

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The r.m.s. speed of a group of 7 gas molecules having speeds  is

1.

2.

3.

4.

Concept Questions :-

Types of velocity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Molecular motion shows itself as

1. Temperature

2. Internal Energy

3. Friction

4. Viscosity

Concept Questions :-

Kinetic energy of gas