One litre of gas A and two litres of gas B, both having the same temperature 100°C and the same pressure 2.5 bar will have the ratio of kinetic energies of their molecules as:

(1) 1:1       (2) 1:2       (3) 1:4         (4) 4:1

Concept Questions :-

Kinetic energy of gas
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On 0°C, the pressure measured by the barometer is 760 mm.  What will be pressure at 100°C?                                  [AFMC 2002]

(1) 760 mm        (2) 730 mm          (3) 780 mm           (4) None of these

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By what percentage, should the pressure of a given mass of gas be increased, so as to decrease its volume by 10% at a constant temperature?

(1) 5%      (2) 7.2 %         (3) 12.5%          (4) 11.1%

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In the adjacent V-T diagram what is the relation between P1 and P2 ?

                            

(a) P2=P1                         (b) P2>P1

(c) P2<P1                         (d) Cannot be predicated

 

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The ratio CpCV=γ for a gas.  Its molecular weight is M. Its specification heat capacity at constant pressure is 

(1) Rγ-1                (2) γRγ-1

(3) γRM(γ-1)         (4) γRM(γ-1)

Concept Questions :-

Specific heat
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Which one of the following graph is correct at constant pressure

1.              2.  

3.               4.  

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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) 4K         (3) 273°C         (4)100°C

Concept Questions :-

Types of velocity
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Four molecules have speeds 2 km/sec, 3 km/sec, 4 km/sec and 5 km/sec.  The root mean square speed of these molecules (km/sec) is:

(1) 544          (2) 542          (3) 3.5            (4) 33

Concept Questions :-

Types of velocity
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How many degrees of freedom the gas molecules have if, under STP, the gas density ρ=1.3 kg/m3 and the velocity of sound propagation in it is 330 ms-1?

(1) 3       (2) 5           (3) 7              (4) 8

Concept Questions :-

Specific heat
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The kinetic energy of one gram molecule of a gas at normal temperature and pressure is: (R = 8.31 J/mol-K)

[DPMT 1997; Pb. PMT 1997, 2000, 03; AFMC 1998; MH CET 1999]

(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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