NCERT Solutions for class 11 Physics | Chapter 13 - Kinetic Theory

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Questions
1 Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will.
A remains the same
B decrease for some and increase for others
C decrease
D increase

Answer:remains the same
2 The temperature of a gas is a measure of
A the average kinetic energy of the gaseous molecules
B the average potential energy of the gaseous molecules
C the average distance between the molecules of the gas
D the size of the molecules of the gas

Answer:the average kinetic energy of the gaseous molecules
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3 Boyle' law is applicable for an
A isothermal process
B isochoric process
C adiabatic process
D isobaric process

Answer:isothermal process
4 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

Answer:molecular motion stops
5 The phenomenon of Browninan movement may be taken as evidence of
A kinetic theory of matter
B electromagnetic theory of radiation
C corpuscular theory of light
D photoelectric phenomenon

Answer:kinetic theory of matter
6 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:first decreases and then increases
7 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

Answer:perfectly elastic rigid sphere
8 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

Answer:pressure alone
9 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

Answer:Both Charle’s law and Boyle’s law
10 In a diatomic molecules, the rotational energy at a given temperature
A obeys Maxwell’s distribution
B have the same volue for all molecules
C equals the translational kinetic energy for each molecule
D None of these

Answer:obeys Maxwell’s distribution
11 The average kinetic energy of gas molecules depends upon which of the following factor?
A Temperature of the gas
B Nature of the gas
C Volume of the gas
D None of these

Answer:Temperature of the gas
12 In the isothermal expansion of 10g of gas from volume V to 2V the work done by the gas is 575J. What is the root mean square speed of the molecules of the gas at that temperature?
A 499m/s
B 532m/s
C 520m/s
D 398m/s

Answer:499m/s
13 Pressure exerted by a gas is
A directly proportional to the density of the gas
B directly proportional to the square of the density of the gas
C inversely proportional to the density of the gas
D independent of density of the gas

Answer:directly proportional to the density of the gas
14 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

Answer:At low pressure and high temperature
15 The deviation of gases from the behaviour of ideal gas is due to
A attraction of molecules
B absolute scale of temp
C covalent bonding of molecules
D colourless molecules

Answer:attraction of molecules
16 In a mixture of gases at a fixed temperature
A heavier molecule has lower average speed
B lighter molecule has lower average speed
C heavier molecule has higher average speed
D None of these

Answer:heavier molecule has lower average speed
17 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

Answer:rate of change of momentum imparted to the walls per second per unit area
18 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

Answer:have same mass but negligible volume
19 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

Answer:have the same average kinetic energy of molecules
20 An inflated rubber balloon contains one mole of an ideal gas, has a pressure p, volume V and temperature T. If the temperature rises to 1.1 T, and the volume is increaset to 1.05 V, the final pressure will be
A 1.1 p
B p
C less than p
D between p and 1.1.

Answer:between p and 1.1.

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