The average kinetic energy of a gas molecule can be determined by knowing:                                        [RPET 2000, MP PET 2010]

(1) The number of molecules in the gas

(2) The pressure of the gas only

(3) The temperature of the gas only

(4) None  of the above is enough by itself

Concept Questions :-

Kinetic energy of gas
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 Volume, pressure, and temperature of an ideal gas are V, P, and T respectively. If the mass of its molecule is m, then its density is [k=boltzmann's constant]

(a) mkT                              (b) PkT

(d)PkTV                             (d) PmkT

Concept Questions :-

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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

Concept Questions :-

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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%

Concept Questions :-

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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

 

Concept Questions :-

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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.  

Concept Questions :-

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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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