If the degree of freedom of gas are f, then the ratio of two specific heats CP/CV is given by:

[MP PET 1995; BHU 1997; MP PMT 2001, 04]

(1) 2f+1                   (2) 1-2f

(3) 1+1f                   (4) 1-1f

Concept Questions :-

Specific heat
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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

Concept Questions :-

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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

Concept Questions :-

Types of velocity
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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

Concept Questions :-

Kinetic energy of gas
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If the molecular weight of two gases are M1 and M2, then at a temperature the ratio of root mean square velocity v1 and v2 will be: [MP PMT 1996; AMU (Engg.) 2000; CPMT 2000; DPMT 2001]

(1) M1M2                          (2) M2M1

(3) M1+M2M1-M2                  (4) M1-M2M1+M2

Concept Questions :-

Types of velocity
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An ideal gas is found to obey an additional law VP2= constant. The gas is initially at temperature T and volume V. When it expands to a volume 2 V, the temperature becomes:

(1) T 2         (2) 2T         (3) 2T2           (4) 4T

Concept Questions :-

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According to the kinetic theory of gases, at absolute temperature: [AIIM 1998; UPSEAT 2000]

(1) Water freezes                             (2) Liquid helium freezes

(3) Molecular motion stops               (3) Liquid hydrogen freezes

Concept Questions :-

Types of velocity
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The figure shows two flasks connected to each other. The volume of the flask 1 is twice that of flask 2.  The system is filled with an ideal gas at temperature of 100 K and 200 K respectively.  If the mass of the gas in 1 be m then what is the mass of the gas in flask 2 [CBSE PMT 2000]

(1) m              (2) m/2       (3) m/4        (4) m/8

Concept Questions :-

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PV versus T graph of equal masses of H2, He and O2 is shown in the figure. Choose the correct alternative.

                                        

1.  A corresponds to H2, B to He and C to O2

2.  A corresponds to He, B to H2 and C to O2

3.  A corresponds to He, B to O2 and C to H2

4.  A corresponds to O2, B to He  and C to H2

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Which one of the following graphs represent the behaviour of an ideal gas at constant temperature?

(1)

 

(2) 

(3)

(4)

Concept Questions :-

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