The root-mean-square velocity of the molecules in a sample of helium is 57th of that of the molecules in a sample of hydrogen.  If the temperature of the hydrogen gas is 0°C, that of the helium sample is about:

1. 0°C       

2. 5.6°C      

3. 273°C         

4. 100°C

Subtopic:  Types of Velocities |
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The kinetic energy of one gram molecule of a gas at standard temperature and pressure is: (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

Subtopic:  Kinetic Energy of an Ideal Gas |
 59%
From NCERT
PMT - 1997
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Gases exert pressure on the walls of containing vessel because  the gas molecules:

1. Possess momentum

2. collide with each other

3. have finite volume

4. obey gas laws

Subtopic:  Kinetic Energy of an Ideal Gas |
 51%
From NCERT
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The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be: (where R is the constant)

1. PV = 5RT

2. PV = 52RT

3. PV = 516RT

4. PV = 532RT

Subtopic:  Ideal Gas Equation |
 82%
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The equation p+av2v-b=RT is known as:

1. Perfect gas equation

2. Joule Thomson's equation

3. Vander Waal's equation

4. Maxwell's equation

Subtopic:  Ideal Gas Equation |
 82%
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The temperature of an ideal gas is increased from 27° to 927°C. The r.m.s. speed of its molecules becomes-

1. twice           

2. half           

3. four times         

4. one fourth

Subtopic:  Types of Velocities |
 75%
From NCERT
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An ideal gas is filled in a vessel, then

1. If it is placed inside a moving train, its temperature increases

2. Its centre of mass moves randomly

3. Its temperature remains constant in a moving car

4. None of these

Subtopic:  Kinetic Energy of an Ideal Gas |
 68%
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Molecular weight of two gases are \(M_1\) and \(M_2.\) At any temperature, the ratio of root mean square velocities \(v_1\) and \(v_2\) will be:
1. \(\sqrt{\frac{M_1}{M_2}}\)
2. \(\sqrt{\frac{M_2}{M_1}}\)
3. \(\sqrt{\frac{M_1+M_2}{M_1-M_2}}\)
4. \(\sqrt{\frac{M_1-M_2}{M_1+M_2}}\)

Subtopic:  Types of Velocities |
 88%
From NCERT
PMT - 1996
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According to the kinetic theory of gases, at absolute zero temperature: [AIIM 1998; UPSEAT 2000]

1. Water freezes                             

2. Liquid helium freezes

3. Molecular motion stops               

4. Liquid hydrogen freezes

Subtopic:  Types of Velocities |
 77%
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PV versus T graphs of equal masses of \(H_2\)\(He\) and \(O_2\) are shown in the figure. Choose the correct alternative:          

1. A corresponds to \(H_2\), B to \(He\) and C to \(O_2\) 2. A corresponds to \(He\), B to \(H_2\), and C to \(O_2\)
3. A corresponds to \(He\), B to \(O_2\), and C to \(H_2\) 4. A corresponds to \(O_2\), B to \(He\)  and C to \(H_2\)
Subtopic:  Ideal Gas Equation |
 65%
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