At a given temperature if Vrms is the root mean square velocity of the molecules of a gas and Vs the velocity of sound in it, then these are related as γ=CPCv

1. Vrms=Vs                             

2. Vrms=3γ×Vs

3. Vrms=γ3×Vs                   

4. Vrms=3γ×Vs

Concept Questions :-

Types of velocity
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Let A and B the two gases and given : TAMA=4.TBMB ; where T is the temperature and M is molecular mass. If CA and CB are the r.m.s. speed, then the ratio CACB will be equal to

1. 2                         

2. 4

3. 1                         

4. 0.5

Concept Questions :-

Types of velocity
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For a gas at a temperature the root-mean-square velocity vrms , the most probable speed vmp , and the average speed vav obey the relationship

1. vav>vrms>vmp                               

2. vrms>vav>vmp

3. vmp>vav>vrms                               

4. vmp>vrms>vav

Concept Questions :-

Types of velocity
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If VH, VN and VO denote the root-mean square velocities of molecules of hydrogen, nitrogen and oxygen respectively at a given temperature, then

1. VN>VO>VH                         

2. VH>VN>VO

3. VO>VN>VH                         

4. VO>VH>VN

Concept Questions :-

Types of velocity
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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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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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