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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The kinetic energy of translation of 20 gm of oxygen at 47°C is (molecular wt. of oxygen is 32 gm/mol and R = 8.3 J/mol/K)

1.  2490 joules                   

2.  2490 ergs

3.  830 joules                     

4.  124.5 joules

Concept Questions :-

Kinetic energy of gas
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The translatory kinetic energy of a gas per gm is

1.  32RTN                         

2.  32RTM

3.  32RT                           

4.  32NKT

Concept Questions :-

Kinetic energy of gas
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The kinetic energy of one gram molecules of a gas at standard temperature and pressure: R=8.31 J/mol-K

1.  0.56×104 J                           

2.  1.3×102 J

3.  2.7×102 J                             

4.  3.4×103 J

Concept Questions :-

Kinetic energy of gas
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The mean kinetic energy of a gas at 300 K is 100 J. The mean energy of the gas at 450 K is equal to

1.  100 J                             

2.  3000 J

3.  450 J                             

4.  150 J

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