## Class 11 Physics Objective Chapter – 13 Kinetic Theory

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## Class 11 Physics Objective Chapter – 13 Kinetic Theory

1. Real gases show mark able deviation from that of ideal gas behavior at

(  a )  High temperature and low pressure

(  b )  Low temperature and high pressure

(  c )  High temperature and high pressure

(  d )  Low temperature and low pressure

Ans:-(  b )

2.Which of the following can be the basis of sesparating a mixture of gases?

(  a )  Graham’s law of diffusion

(  c )  Charle’s law

(  d )  Boyle’s law

Ans:-(  a )

3. One mole of mono atomic gas (  g = 5/3 )  is mixed with one mole of diatomic gas (  g = 7/5 )  what will be the value of g for the mixture?

(  a )  1.5

(  b )  2.5

(  c )  1.0

(  d )  2

Ans:-(  a )

4.Kinetic theory of gases provide a base for

(  a )  Both Charle’s law and Boyle’s law

(  b )  None of these

(  c )  Boyle’s law

(  d )  Charle’s law

Ans:-(  a )

5.A hotter gas implies higher average value of

(  a )  heat content

(  b )  K.E.

(  c )  total energy

(  d )  internal energy

Ans:-(  b )

6.The kinetic theory of gases

(  a )  explains the behaviour of an ideal gas.

(  b )  describes the motion of a single atom or molecule.

(  c )  relates the temperature of the gas

with K.E. of atoms of the gas

(  d )  All of the above

Ans:-(  d )

7. A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio CP /CV of the mixture is

(  a )  1.4

(  b )  1.54

(  c )  1.59

(  d )  1.62

Ans:-(  d )

8.The three states of matter depend on

(  a )  biomass

(  b )  potential energy

(  c )  force

(  d )  temperature

Ans:-(  d )

9. One mole of mono atomic gas (  g = 5/3 )  is mixed with one mole of diatomic gas (  g = 7/5 )  what will be the value of g for the mixture?

(  a )  1.5

(  b )  2.5

(  c )  1.0

(  d )  2

Ans:-(  a )

10. In the equation, PV = RT, the V refers to the volume of:

(  a )  1 g of a gas

(  b )  1 mole of a gas

(  c )  1 kg of gas

(  d )  any amount of gas

Ans:-(  b )

11. A room temperature the r.m.s. velocity of the molecules of a certain diatomic gas is found to be 1930 m/sec. the gas is

(  a )  H2

(  b )  F2

(  c )  O2

(  d )  Cl2

Ans:-(  a )

12. When do real gases approach the ideal gas behaviour

(  a )  At low pressure and high temperature

(  b )  At high pressure and high temperature

(  c )  At high pressure and low temperature

(  d )  At low pressure and low temperature

Ans:-(  a )

13. 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

Ans:-(  c )

14.The molecules of a given mass of gas have a root mean square velocity of 200m s–1 at 27°C and 1.0 × 10N m–2 pressure. When the temperature is 127°C and the pressure 0.5 × 105 Nm–2, the root mean square velocity in ms–1, is

(  a )  400/3

(  b )  1002

(  c )  1002/3

(  d )  100/3

Ans:-(  a )

15.The heat capacity per mole of water is (  R is universal gas constant )

(  a )  9R

(  b )  9/2 R

(  c )  6R

(  d )  5R

Ans:-(  a )

16. What is the average velocity of the molecules of an ideal gas?

(  a ) Zero

(  b ) Constant

(  c ) Unstable

(  d ) Infinity

Ans:-(  a )

17. Liquids have

(  a ) Fixed shape and volume

(  b ) Variable shape and volume

(  c ) Variable shape but fixed volume

(  d ) Fixed shape but variable volume

Ans:-(  c )

18. Gases deviate from perfect gas behaviour because their molecules

(  a )  are polyatomic

(  b )  are of very small size

(  c )  don’t attract each other

(  d )  interact with each other through intermolecular forces

Ans:-(  d )

19.The temperature at which the r.m.s. velocity of H2 becomes escape velocity from the earth is;

(  a )  10059°C

(  b )  10059 K

(  c )  10332°C

(  d )  10332 K

Ans:-(  b )

20.According to the kinetic theory of gases, the pressure exerted by a gas on the wall of the container is measured as

(  a )  rate of change of momentum imparted to the walls per second per unit area

(  b )  momentum imparted to the walls per unit area

(  c )  change of momentum imparted to the walls per unit area

(  d )  change in momentum per unit volume

Ans:-(  b )

21.Energy supplied to convert unit mass of substance from solid to liquid state at its melting point is called

(  a )  Latent heat of fusion

(  b )  Evaporation

(  c )  Solidification

(  d )  Latent heat of fission

Ans:-(  a )

22.If masses of all molecule of a gas are halved and their speed doubled then the ratio of initial and final pressure will be

(  a )  2 : 1

(  b )  1 : 2

(  c )  4 : 1

(  d )  1 : 4

Ans:-(  b )

23.One kg of a diatomic gas is at a pressure of 8 × 104 N m–2. The density of the gas is 4 kg m–3. What is the energy of the gas due to its thermal motion?

(  a )  3 × 104 J

(  b )  5 × 104 J

(  c )  6 × 104 J

(  d )  7 × 104 J

Ans:-(  b )

24.Why are liquids and gases termed as fluids? Because

(  a ) they have irregular shape

(  b ) they have randomly moving particles

(  c ) they are compressible

(  d ) they can flow

Ans:-(  d )

25.The temperature at which the r.m.s. velocity of H2 becomes escape velocity from the earth is,

(  a )  10059°C

(  b )  10059 K

(  c )  10332°C

(  d )  10332 K

Ans:-(  b )

26. Who gave the law of equipartition of energy?

(  a )  Maxwell

(  b )  Claussius

(  c )  Boltzmann

(  d )  Carnot

Ans:-(  a )

27. Moon has no atmosphere because

(  a )  It is far away form the surface of the earth

(  b )  Its surface temperature is 10°C

(  c )  The r.m.s. velocity of all the gas molecules is more then the escape velocity of the moons surface

(  d )  The escape velocity of the moons surface is more than the r.m.s velocity of all molecules

Ans:-(  c )

28. When a gas is in thermal equilibrium, its molecules

(  a )  have the same average kinetic energy of molecules

(  b )  have different energies which remain constant

(  c )  have a certain constant energy

(  d )  do not collide with one another

Ans:-(  a )

29.The law of equipartition of energy is applicable to the system whose constituents are

(  a ) in orderly motion

(  b ) at rest

(  c ) in random motion

(  d ) moving with constant speed

Ans:-(  c )

30. On a particular day, the relative humidity is 100% and the room temperature is 30ºC, then the dew point is

(  a )  70ºC

(  b )  30ºC

(  d )  100ºC

(  d )  0ºC

Ans:-(  b )

31.The ratio CP/CV = ϒ for a gas. Its molecular weight is M. Its specific heat capacity at constant  pressure is

(  a )  R / ϒ − 1

(  b )  ϒR / ϒ − 1

(  c )  ϒR / M (  ϒ − 1 )

(  d )  ϒRM / (  ϒ − 1 )

Ans:-(  c )

32.The Brownian Motion was discovered by the scientist

(  a ) Albert Brown

(  b ) John Brown

(  c ) Robert Brown

(  d ) Isaac Brown

Ans:-(  c )

33. Moon has no atmosphere because

(  a )  It is far away form the surface of the earth

(  b )  Its surface temperature is 10°C

(  c )  The r.m.s. velocity of all the gas molecules is more then the escape velocity of the moons surface

(  d )  The escape velocity of the moons surface is more than the r.m.s velocity of all molecules

Ans:-(  c )

34.The monoatomic molecules have only three degrees of freedom because they can possess

(  a )  only translatory motion

(  b )  only rotatory motion

(  c )  both translatory and rotatory motion

(  d )  translatory, rotatory and vibratory motion

Ans:-(  a )

35. 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

Ans:-(  c )

36.Molecules of a ideal gas behave like

(  a )  perfectly elastic rigid sphere

(  b )  inelastic non-rigid sphere

(  c )  perfectly elastic non-rigid sphere

(  d )  inelastic rigid sphere

Ans:-(  a )

37.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

(  a ) Halved

(  b ) Doubled

(  c ) Tripled

Ans:-(  b )

38.The ratio of principal molar heat capacities of a gas is maximum for

(  a )  a diatomic gas

(  b )  a monatomic gas

(  c )  a polyatomic gas having linear molecules.

(  d )  a polyatomic gas having non-linear molecules.

Ans:-(  b )

39. If one mole of a monatomic gas {ϒ = 5/3} is mixed with one mole of a diatomic gas {ϒ = 7/3} the value of ϒ for the mixture is

(  a )  1.40

(  b )  1.50

(  c )  1.53

(  d )  3.07

Ans:-(  b )

40.The random motion of smoke or gas particles in the air is termed as

(a) Bruneian motion

(b) Brownian motion

(c) blackian motion

(d) randomium motion

Ans:-(  b )

41. 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

Ans:-(  c )

42. What is the number of degrees of freedom of an ideal diatomic molecule at ordinary temperature ?

(  a )  3

(  b )  5

(  c )  7

(  d )  6

Ans:-(  b )

43. Latent heat of ice is

(  a )  Less than external latent heat of fusion

(  b )  Equal to external latent heat of fusion

(  c )  More then external latent heat of fusion

(  d )  Twice the external latent heat of fusion

Ans:-(  c )

44.In kinetic theory of gases, it is assumed that molecules

(  a )  have same mass but negligible volume

(  b )  have different mass as well as volume

(  c )  have same volume but mass can be different

(  d )  have same mass but can have different volume

Ans:-(  a )

45.Moon has no atmosphere because

(  a ) It is far away form the surface of the earth

(  b ) Its surface temperature is 10°C

(  c ) The r.m.s. velocity of all the gas molecules is more then the escape velocity of the moons surface

(  d ) The escape velocity of the moons surface is more than the r.m.s velocity of all molecules

Ans:-(  c )

46.The correct statement of the law of equipartition of energy is

(  a )  the total energy of a gas is equally divided among all the molecules.

(  b )  The gas possess equal energies in all the three directions x,y and z-axis.

(  c )  the total energy of a gas is equally divided between kinetic and potential energies.

(  d )  the total kinetic energy of a gas molecules is equally divided among translational and rotational kinetic energies

Ans:-(  b )

47. wo mole of oxygen is mixed with eight mole of helium. The effective specific heat of the mixture  at constant volume is

(  a )  1.3R

(  b )  1.4R

(  c )  1.7R

(  d )  1.9R

Ans:-(  c )

48.Boyle’s law is applicable for an

(  a ) isothermal process

(  b ) isochoric process

(  d ) isobaric process

Ans:-(  a )

49. Which of the following is the unit of specific

(  a )  J kg/°c

(  b )  J/kg°c

(  c )  kg°c/J

(  d )  J kg/°c²

Ans:-(  b )

50.The number of degrees of freedom for translatory motion are

(  a )  dependent on the nature of translatory motion.

(  b )  same for all types of molecules.

(  c )  less for multiatomic molecules.

(  d )  more for multiatomic molecules

Ans:-(  b )

51. An ideal gas is that which can

(  a )  Be solidified

(  b )  Liquefied

(  c )  Not be liquefied

(  d )  Not be solidified

Ans:-(  c )

52.The internal energy of a gram-molecule of an ideal gas depends on

(  a )  pressure alone

(  b )  volume alone

(  c )  temperature alone

(  d )  both on pressure as well as temperature

Ans:-(  a )

53.Gases deviate from perfect gas behaviour because their molecules

(  a ) are polyatomic

(  b ) are of very small size

(  c ) don’t attract each other

(  d ) interact with each other through intermolecular forces

Ans:-(  d )

54.The internal energy of an ideal gas is

(  a )  the sum of total kinetic and potential energies.

(  b )  the total translational kinetic energy.

(  c )  the total kinetic energy of randomly moving molecules.

(  d )  the total kinetic energy of gas molecules.

Ans:-(  d )

55. A gas mixture consists of 2.0 moles of oxygen and 4.0 moles of neon at temperature T.  Neglecting all vibrational modes, calculate the total internal energy of the system. (  Oxygen has two rotational modes. )

(  a )  11 RT

(  b )  13 RT

(  c )  15 RT

(  d )  19 RT

Ans:-(  a )