#10-Pressure-of-Gas
(Physics) > Kinetic Theory of Gases
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The mean translational kinetic energy of a perfect gas molecule at the temperature T Kelvin is:

(1) 12kT         (2) kT             (3) 32kT            (4) 2 kT

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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

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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

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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

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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

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