The r.m.s. speed of a group of 7 gas molecules having speeds 6, 4, 2, 0, -2, -4, -6 m/s is

1. 1.5 m/s                                   

2. 3.4 m/s

3. 9 m/s                                       

4. 4 m/s

Concept Questions :-

Types of velocity
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If the ratio of vapour density for hydrogen and oxygen is 116 , then under constant pressure the ratio of their rms velocities will be

1. 41                                   

2. 14

3. 116                                 

4. 161

Concept Questions :-

Types of velocity
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Molecular motion shows itself as

1. Temperature                     

2. Internal Energy

3. Friction                             

4. Viscosity

Concept Questions :-

Kinetic energy of gas
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What is the velocity of wave in monoatomic gas having pressure 1 kilopascal and density 2.6 kg/m3 ?

1.  3.6 m/s                                 

2.  8.9×103 m/s

3.  Zero                                       

4.  None of these

Concept Questions :-

Types of velocity
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If the pressure in a closed vessel is reduced by drawing out some gas, the mean free path of the molecules

1. Is decreased

2. Is increased

3. Remains unchanged

4. Increases or decreases according to the nature of the gas

Concept Questions :-

Kinetic energy of gas
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At constant volume, temperature is increased. Then

1. Collision on walls will be less

2. Number of collisions per unit time will increase

3. Collisions will be in straight lines

4. Collisions will not change

Concept Questions :-

Types of velocity
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The r.m.s. speed of a certain gas is n at 400K. The temperature at which the r.m.s. speed becomes two times, will be

1.  800 K                         

2.  1600 K

3.  1200 K                       

3.  None of these

Concept Questions :-

Types of velocity
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A cubical box with porous walls containing an equal number of O2 and H2 molecules is placed in a large evacuated chamber. The entire system is maintained at constant temperature T. The ratio of vrms of O2 molecules to that of the vrms of H2 molecules, found in the chamber outside the box after a short interval is

1.  122                             

2.  14

3.  12                               

4.  2

Concept Questions :-

Types of velocity
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The degrees of freedom of a triatomic gas is

1.  2                                 

2.  4

3.  6                                 

3.  8

Concept Questions :-

Law of equipartition of energy
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The value of CV for one mole of neon gas is

1.  12R                           

2.  32R

3.  52R                           

4.  72R

Concept Questions :-

Specific heat
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