A horizontal uniform glass tube of 100 cm, length sealed at both ends contain 10 cm mercury column in the middle. The temperature and pressure of air on either side of mercury column are respectively 81°C and 76 cm of mercury. If the air column at one end is kept at 0°C and the other end at 273°C, the pressure of air which is at 0°C is (in cm of Hg)

1.  76                                   

2.  68.2

3.  87.9                            

4.  122

Subtopic:  Ideal Gas Equation |
 51%
From NCERT
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At standard temperature and pressure the density of a gas is 1.3 kg/m3 and the speed of the sound in gas is 330 m/sec. Then the degree of freedom of the gas will be

1.  3                         

2.  4

3.  5                         

4.  6

Subtopic:  Types of Velocities |
 68%
From NCERT
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The temperature of 5 moles of a gas which was held at constant volume was changed from 100°C to 120°C. The change in internal energy was found to be 80 Joules. The total heat capacity of the gas at constant volume will be equal to

1.  8 J/K                     

2.  0.8 J/K

3.  4.0 J/K                 

4.  0.4 J/K

Subtopic:  Specific Heat |
From NCERT
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The temperature at which the r.m.s. speed of hydrogen molecules is equal to escape velocity on earth surface, will be

1.  1060 K                   

2.  5030 K

3.  8270 K                   

4.  10063 K

Subtopic:  Types of Velocities |
 58%
From NCERT
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Inside a cylinder having insulating walls and closed at ends is a movable piston, which divides the cylinder into two compartments. On one side of the piston is a mass m of a gas and on the other side a mass 2 m of the same gas. What fraction of volume of the cylinder will be occupied by the larger mass of the gas when the piston is in equilibrium ? Consider that the movable piston is conducting so that the temperature is the same throughout

1.  14                                 

2.  13

3.  12                                 

4.  23

Subtopic:  Ideal Gas Equation |
 56%
From NCERT
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The diameter of oxygen molecules is 2.94×10-10 m. The Vander Waal's gas constant 'b' in m3/mol will be

1.  3.2                             

2.  16

3.  32×10-4                 

4.  32×10-6

Subtopic:  Ideal Gas Equation |
 50%
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The temperature of the mixture of one mole of helium and one mole of hydrogen is increased from 0°C to 100°C at constant pressure. The amount of heat delivered will be

1.  600 cal                   

2.  1200 cal

3.  1800 cal                 

4.  3600 cal

Subtopic:  Specific Heat |
 69%
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A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at \(300\) K. The ratio of the average rotational kinetic energy per O2 molecule to that per N2 molecule is:

1. 1 : 1
2. 1 : 2
3. 2 : 1
4. depends on the moments of inertia of the two molecules

Subtopic:  Law of Equipartition of Energy |
 71%
From NCERT
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A vessel contains 14 gm (7 moles) of hydrogen and 96 gm (3 moles) of oxygen at STP. A chemical reaction is induced by passing electric spark in the vessel till one of the gases is consumed. The temperature is brought back to it's starting value 273 K. The pressure in the vessel is

 

1.  0.1 atm                       

2.  0.2 atm

3.  0.3 atm                       

4.  0.4 atm

Subtopic:  Ideal Gas Equation |
 52%
From NCERT
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A jar contains a gas and few drops of water at T K. The pressure in the jar is 830 mm of mercury. The temperature of jar is reduced by 1%. The saturated vapour pressure of water at the two temperatures are 30 mm and 25 mm of mercury. Then the new pressure in the jar will be

1.  917 mm of Hg                       

2.  717 mm of Hg

3.  817 mm of Hg                       

4.  None of these

Subtopic:  Ideal Gas Equation |
 58%
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