If a gas has n degrees of freedom ratio of specific heats of gas is

1.  1+n2                         

2.  1+1n

3.  1+n2                         

4.  1+2n

Concept Questions :-

Specific heat
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A gaseous mixture consists of 16g of helium and 16g of oxygen. The ratio CPCV of the mixture is

1.  1.4                       

2.  1.54

3.  1.59                     

4.  1.62

Concept Questions :-

Specific heat
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The pressure exerted by the gas on the walls of the container because

1. It loses kinetic energy

2. It sticks with the walls

3. On collision with the walls there is a change in momentum

4. It is accelerated towards the walls

Concept Questions :-

Kinetic energy of gas
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Gas at a pressure P0 is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

1.  4P0                                 

2.  2P0

3.  P0                                   

4.  P02

Concept Questions :-

Types of velocity
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A box contains n molecules of a gas. How will the pressure of the gas be effected, if the number of molecules is made 2n?

1. Pressure will decrease

2. Pressure will remain unchanged

3. Pressure will be doubled

4. Pressure will become three times

Concept Questions :-

Kinetic energy of gas
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At a given temperature, the pressure of an ideal gas of density ρ is proportional to

1. 1ρ2                                   

2. 1ρ

3. ρ2                                     

4. ρ

Concept Questions :-

Kinetic energy of gas
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Consider a gas with density ρ and c¯ as the root mean square velocity of its molecules contained in a volume. If the system moves as whole with velocity v, then the pressure exerted by the gas is

1.  13ρc¯ 2                                   

2.  13ρc+v2

3.  13ρc¯-v2                         

4.  13ρc-2-v2

Concept Questions :-

Types of velocity
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In kinetic theory of gases, a molecule of mass m of an ideal gas collides with a wall of vessel with velocity V. The change in the linear momentum of the molecule is

1.  2mV                           

2.  mV

3.  – mV                           

4.  Zero

Concept Questions :-

Kinetic energy of gas
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The ratio of mean kinetic energy of hydrogen and oxygen at a given temperature is

1.  1 : 16                     

2.  1 : 8

3.  1 : 4                       

4.  1 : 1

Concept Questions :-

Kinetic energy of gas
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A sealed container with negligible coefficient of volumetric expansion contains helium (a monoatomic gas). When it is heated from 300 K to 600 K, the average K.E. of helium atoms is

1. Halved                     

2. Unchanged

3. Doubled                   

4. Increased by factor 2

Concept Questions :-

Kinetic energy of gas
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