# CBSE Class 11 Physics Kinetic Theory MCQ with Answers PDF

CBSE MCQ Questions for Class 11 Physics Chapter 13 Kinetic Theory with Answers Pdf free download. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. This MCQ will help you score good marks in the final exam. Kinetic Theory Class 11 Physics MCQs are prepared for a better understanding of the concept. Kinetic Theory Class 11 Physics MCQ is prepared by Experts of CBSE.

# Class 11 Physics Chapter 13 Kinetic Theory MCQs

Check the multiple-choice questions for the 11th Class Physics Chapter 13 Kinetic Theory. Select one answer out of 4 options.

## Kinetic Theory Class 11 MCQs Questions with Answers

The phenomenon of Brownian movement may be taken as evidence of
(a) kinetic theory of matter
(c) corpuscular theory of light
(d) photoelectric phenomenon

Answer: (a) kinetic theory of matter

At a given temperature the force between molecules of a gas as a function of intermolecular distance is
(a) first decreases and then increases
(b) always increases
(c) always decreases
(d) always constant

Answer: (a) first decreases and then increases

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

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

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

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

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

One mole of an ideal gas requires 207 J heat to raise the temperature by 10 K, when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by 10K, then heat required is
(a) 96.6 J
(b) 124 J
(c) 198.8 J
(d) 215.4 J

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

Answer: (c) More then external latent heat of fusion

Kinetic theory of gases provide a base for
(a) Both Charles’s law and Boyle’s law
(b) None of these
(c) Boyle’s law
(d) Charles’s law

Answer: (a) Both Charles’s law and Boyle’s law

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

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

Answer: (a) Latent heat of fusion

If 2 kcal, of heat is supplied to a system cause to change the internal energy of a gas is 5030 J, and external work done is 3350 J, then what is mechanical equivalent of heat?
(a) 41.90 J/kcal
(b) 4190 J/cal
(c) 4.19 J/kcal
(d) 4.19 J/cal

Average kinetic energy of molecules is
(a) Directly proportional to square root of temperature
(b) Directly proportional to absolute temperature
(c) Independent of absolute temperature
(d) Inversely proportional to absolute temperature

Answer: (b) Directly proportional to absolute temperature

The average kinetic energy of the molecules of a gas at 27°C is 9 10-20 J. what is its average K.E. at 227°C?
(a) 5 10-20 J
(b) 10 10-20 J
(c) 15 10-20 J
(d) 20 10-20 J

The temperature of a gas is -68°C. to what temperature should it be heated, so that the r.m.s. velocity of the molecules be doubled?
(a) 357°C
(b) 457°C
(c) 547°C
(d) 820°C

According to kinetic theory of gases, at absolute zero of temperature
(a) Water freezes
(b) Liquid helium freezes
(c) Molecular motion stops
(d) Liquid hydrogen freezes

For a gas, the r.m.s. speed at 800K is
(a) Half the value at 200 K
(b) Double the value at 200 K
(c) Same as at 200 K
(d) Four times the value at 200 K

Answer: (b) Double the value at 200 K

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

Following gases are kept at the same temperature. Which gas possesses maximum r.m.s. speed?
(a) Oxygen
(b) Nitrogen
(c) Hydrogen
(d) Carbon dioxide

PV/3 = RT, V represents volume of
(a) Any amount of gas
(b) 2 moles of gas
(c) 3 moles of gas
(d) 4 moles of gas

Answer: (c) 3 moles of gas

If 2 kcal, of heat is supplied to a system cause to change the internal energy of a gas is 5030 J, and external work done is 3350 J, then what is mechanical equivalent of heat?
(a) 41.90 J/kcal
(b) 4190 J/cal
(c) 4.19 J/kcal
(d) 4.19 J/cal

What is the number of degrees of freedom of an ideal diatomic molecule at ordinary temperature?
(a) 3
(b) 5
(c) 7
(d) 6

The volume of 5 moles of a gas at N.T.P. in litres is
(a) 112
(b) 11.2
(c) 1.12
(d) 1120

An ideal gas is that which can
(a) Be solidified
(b) Liquefied
(c) Not be liquefied
(d) Not be solidified

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

A man is climbing up a spiral type of staircase. His degrees of freedom are:
(a) 1
(b) 2
(c) 3
(d) more than 3

The state of greatest potential energy is
(a) gaseous
(b) liquid
(c) solid
(d) solid as well as liquid

Answer: (c) 3 moles of gas

In kinetic theory’ of gases, it is assumed that:
(a) the collisions are not perfectly elastic
(b) the molecular collisions change the density of the gas
(c) the molecules don’t collide with each other on the well
(d) between two collisions the molecules travel with uniform velocity

Answer: (d) between two collisions the molecules travel with uniform velocity

K.E. of gas molecules is zero at
(a) 0°C
(b) 273°t
(c) -273°C
(d) none of the above

The pressure P and density p of a gas are related as
(a) P ∝ ρ
(b) P ∝ 1/ρ
(c) P ∝ ρ²
(d) P ∝ 1/ρ2

Boyle’ law is applicable for an
(a) isothermal process
(b) isochoric process
(d) isobaric process

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

Answer: (b) Low temperature and high pressure

According to kinetic theory of gases, at absolute zero temperature
(a) molecular motion stops
(b) liquid hydrogen freezes
(c) liquid helium freezes
(d) water freezes