Field Theory Answers

The specific heat of a gas
Has only one value
No answer
Is proportional to the square root of its absolute temperature
Can have any value between 0 and infinity
6 At constant volume temperature is increased then
Collision on walls will be less
Collision frequency will be increases
Collision will be in straight line
Collision will not change
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
mkT
P/kT
P/kTV
Pm/kT
8 If for a gas
R/CV=0.67
this gas is made up of molecules which are
Diatomic
Mixture of diatomic and polyatomic
Mono atomic
Polyatomic

The specific heat of a substance at its boiling point or melting point
Is 0
Is infinity
Is negative
lies between 0 and 1
2 A unit mass of solid converted to liquid at its melting point. Heat is required for this process is
Specific heat
Latent heat of vaporization
Latent heat of fusion
External latent heat
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?
0.25 km/s
0.5 km/s
0.75 km/s
0.6 km/s
4 Which one of the following quantities can be zero on a average for the molecules of an ideal gas in equilibrium?
Kinetic energy
Density
Momentum
Speed

The difference between the principal specific heats of nitrogen is 300 J/kg °K and ratio of the two specific heats is 1.4. then the CP is
1050 J/kg °K
650 J/kg °K
750 J/kg °K
150 J/kg °K
17
CP
and
CV
denote the molar specific heats of a gas at constant pressure and at constant volume respectively. If and
CP/CV=γ,
then
CV
is equal to

R/(γ−1)

(γ−1)/R

Nosolution

373.2oC
18 A gas is taken in a sealed container at 300 K. it is heated at constant volume to a temperature 600 K. the mean K.E. of its molecules is
Halved
Doubled
Tripled
Quadrupled
19 R.M.S velocity of a gas molecule of mass m at given temperature is proportional to

mo
m

m1/2

1/m1/2
20 The mean kinetic energy of one gram-mole of a perfect gas at absolute temperature T is
0.5kT
0.5RT
1.5kT
1.5RT

Average kinetic energy of molecules is
Inversely proportional to absolute temperature
Independent of absolute temperature
Directly proportional to absolute temperature
Directly proportional to square root of temperature
12 The specific heat of a gas in isothermal process is ?
0
Negative
constant
Infinite
13 Latent heat of ice is ?
Less than external latent heat of fusion
Equal to external latent heat of fusion
More then external latent heat of fusion
Twice the external latent heat of fusion
14 The r.m.s. velocity of the molecules in the sample of helium is 5/7th that of the molecules in the sample of hydrogen. If the temperature of the hydrogen sample is 0°C that of helium is
0°C
0°K
273°C
100°C
15 Mean square velocity of five molecules of velocities 2 m/s, 3 m/s, 4 m/s, 5 m/s and 6 m/s is in
m2/s2
?
10
18
20
15

Expansion joints are used for materials that easily expand and contract depending upon its temperature. How much expansion can take place for a brass pipe 25.8 m long that experiences temperature changes of 75.2°C?
3.44 cm
5.90 cm
3.69 cm
1.23 cm

The amount of heat necessary to change an object's temperature 1 kg 1°C is called
fusion.
temperature.
radiant heat.
specific heat.

Temperature is
a form of heat transfer where energy is radiated in the form of rays.
a form of heat transfer.
a form of energy contained in an object associated with the motion of molecules.
a measure of the hotness or coldness of an object.

No water vapor is added to or removed from a sample of air that is cooling, so the relative humidity of this sample of air will
remain the same.
be lower.
be higher.
the answer depends on the temperature.

Anytime a temperature difference occurs, you can expect
cold to move to where it is warmer.
energy movement from higher temperature regions
no energy movement unless it is warm enough, at least above the freezing temperature
energy movement flowing slowly from cold to warmer regions.

As a solid goes through a phase change to a liquid, heat is absorbed and the temperature
increases
decreases
remains the same
fluctuates.