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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
( b ) Avogadro’s law
( 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 × 105 N 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 ) 100√2
( c ) 100√2/3
( 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
( d ) Quadrupled
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
( c ) adiabatic 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 )