Multiple Choice Questions
1.R.m.s. velocity of a gas molecule of mass m at given temperature
is proportional to
a)
m0
b)
m
c)m1/2
d)1/(m)1/2
2. The mean kinetic energy of one gram-mole of a perfect gas at
absolute temperature T is
a)(1/2)kT
b)(1/2)RT
c)(3/2)kT
d)(3/2)RT
3.The specific heat of a substance at its boiling point or melting
point
a)
Is zero
b)
Is infinity
c)
Is negative
d)
Lies between 0 and 1
4.Mean kinetic energy per gm. Molecule of a gas is given by
a)(3/2)RT
b)
kT
c)(1/2)kT
d)(3/2)kT
5.If for a gas [R/CV]=0.67 this gas is made up of
molecules which are
a)
Diatomic
b)
Mixture of diatomic and polyatomic
c)
Mono atomic
d)
Polyatomic
6.CP and CV are the principal
specific heat of a gas. In terms of mechanical units, CP -CV is
equal to
a)
R
b)R/J
c)R/MJ
d)R/M
7.A sample of an ideal gas occupies a volume V at a pressure P and
absolute temperature T, the mass of each molecules is m. the expression for the
density of gas is (k= Boltzmann constant)
a)
mkT
b)P/kT
c)P/kTV
d)Pm/kT
8.One mole of ideal gas required 207 J heat to rise the
temperature by 10oK when heated at constant pressure. If the same
gas is heated at constant volume to raise the temperature by the same 10oK
the heat required is (Ro 8/3 J/mole oK)
a)
1987 J
b)
29 J
c)
215.3 J
d)
124 J
9.The average translational K.E. of O2 molecules
(Molecular weight =32) at a particular temperature is .035 eV. What is the
average translational K.E. of N2 Molecules (Molecular weight=28)
at the same temperature?
a)
0.028 eV
b)
0.055 eV
c) 0.035 eV
d)
0.075 eV
10.At constant volume temperature is increased then
a)
Collision on walls will be less
b)
Collision frequency will be increases
c)
Collision will be in straight line
d)
Collision will not change
Answer
