Multiple Choice Questions
1.The specific heat of a gas
a) Has only one
value
b) Has two values CP and CV
c) Is proportional to the square root of its absolute temperature
d) Can have any value between 0 and infinity
2.Which one of the following quantities can be zero on a average
for the molecules of an ideal gas in equilibrium?
a) Kinetic energy
b) Density
c) Momentum
d) Speed
3.At a certain temperature, hydrogen molecules have r.m.s.
velocity of 3 km/s. what is the r.m.s velocity of the oxygen molecules at the
same temperature?
a) 0.25 km/s
b) 0.5 km/s
c) 0.75 km/s
d) 6 km/s
4. We have a jar ‘A’ filled with a gas characterized by
parameter P, V and T. another jar ‘B’ filled with a gas with parameters 2P,[V/2]
and 2T, where symbols have their usual meanings. The ratio of the number of
molecules of jar ‘A’ to those of jar ‘B’ is
a) 1: 1
b) 1: 2
c) 2: 1
d) 4: 1
5.A unit mass of solid converted to liquid at its melting point.
Heat is required for this process is
a) Specific heat
b) Latent heat of vaporization
c) Latent heat of fusion
d) External latent heat
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6. At what temperature, the rms speed of gas
molecules I half the value at NTP?
a) 68.25 K
b) 273 K
c) 345 K
d) 0 K
7. The r.m.s. speed of the molecules of a gas
in a vessel is 200 m/s. if 25% of the gas leaks out of the vessel, at
constant temperature, then the r.m.s. speed of the remaining molecules will
be
a) 400 m/s
b) 150 m/s
c) 100 m/s
d) 200 m/s
8. A wall is hit elastically and normally by n
balls per second, all the balls have the same mass m and are moving with the
same velocity u. the force exerted by the balls on the wall is
a) mnu2
b) 2 mnu2
c) 2 mnu
d)1/2mnu2
9.The temperature at which the r.m.s. velocity
of H2 becomes escape velocity from the earth is,
a) 10059 oC
b) 10059 K
c) 10332 oC
d) 10332 K
10. A molecule of mass m moving with a
velocity v makes 5 elastic collisions with a wall of the container per
second. The change in its momentum per second will be
a) mv
b) 5 mv
c)mv/10
d) 10 mv
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