# Class 11 Physics Chapter 13 Kinetic Theory MCQ Questions with Answer

Kinetic Theory Class 11 MCQ is one of the best strategies to prepare for the CBSE Class 11 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQ on Kinetic Theory Class 11, which will help them all through their board test.

## Kinetic Theory Class 11 MCQ Questions with Answer

Class 11 Physics MCQ with answers are given here to Chapter 13 Kinetic Theory. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 11 Physics syllabus. By Solving these Class 11 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 11 Annual exam.

Learn Class 11 Kinetic Theory MCQs with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 11 Physics Kinetic Theory MCQ with answers given below

Question 1. 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

Answer

B

Question 2. 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

Answer

B

Question 3. 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

Answer

D

Question 4. 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

Answer

A

Question 5. 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.

Answer

D

Question 6. A fixed mass of gas at constant pressure occupies a volume V. The gas undergoes a rise in temperature so that the root mean square velocity of its molecules is doubled. The new volume will be
(a) V/2
(b) V / 2
(c) 2 V
(d) 4 V

Answer

D

Question 7. 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.

Answer

B

Question 8. 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.

Answer

B

Question 9. Let v denote the rms speed of the molecules in an ideal diatomic gas at absolute temperature T.
The mass of a molecule is ‘m’ Neglecting vibrational energy terms, the false statement is
(a) a molecule can have a speed greater than 2v
(b) v is proportional to T
(c) the average rotational K.E. of a molecule is 1/4 mv2
(d) the average K.E. of a molecule is 5/6mv

Answer

C

Question 10. At constant pressure, the ratio of increase in volume of an ideal gas per degree rise in kelvin temperature to its original volume is (T = absolute temperature of the gas) is
(a) T2
(b) T
(c) 1/T
(d) 1/T2

Answer

C

Question 11. In kinetic theory of gases, it is assumed that molecules
(a) have same mass but can have different volume
(b) have same volume but mass can be different
(c) have different mass as well as volume
(d) have same mass but negligible volume.

Answer

D

Question 12. Gases exert pressure on the walls of the container because the gas molecules
(a) possess momentum
(b) collide with each other
(c) have finite volume
(d) obey gas laws.

Answer

A

Question 13. In the kinetic theory of gases, which of these statements is/are true ?
(i) The pressure of a gas is proportional to the mean speed of the molecules.
(ii) The root mean square speed of the molecules is proportional to the pressure.
(iii) The rate of diffusion is proportional to the mean speed of the molecules.
(iv) The mean translational kinetic energy of a gas is proportional to its kelvin temperature.
(a) (ii) and (iii) only
(b) (i),(ii)and (iv) only
(c) (i) and (iii) only
(d) (iii) and (iv) only

Answer

D

Question 14. The K.E. of one mole of an ideal gas is E = (3/2) RT. Then Cp will be
(a) 0.5 R
(b) 0.1 R
(c) 1.5 R
(d) 2.5 R

Answer

D

Question 15. The root mean square speed of the molecules of a diatomic gas is v. When the temperature is doubled, the molecules dissociate into two atoms. The new root mean square speed
of the atom is
(a) √2v
(b) v
(c) 2v
(d) 4v

Answer

C

Question 16. At room temperature, the rms speed of the molecules of a certain diatomic gas is found to be 1930 m/s. The gas is
(a) H2
(b) F2
(c) O2
(d) Cl2

Answer

A

Question 17. Two gases A and B having the same temperature T, same pressure P and same volume V are mixed. If the mixture is at the same temperature T and occupies a volume V, the pressure of the mixture is
(a) 2 P
(b) P
(c) P/2
(d) 4 P

Answer

A

Whoever needs to take the CBSE Class 11 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 11 Physics Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Kinetic Theory Class 11 MCQ are ready by the subject specialists themselves.

Question 18. A sample of an ideal gas occupies a volume of V at a pressure P and absolute temperature. T. The mass of each molecule is m. The equation for density is
(a) m k T
(b) P/k T
(c) P/(k T V)
(d) P m/k T

Answer

D

Question 19. The value of critical temperature in terms of van der Waal’s constant a and b is given by
(a) Tc = 8a/27Rb
(b) Tc = a/27Rb
(c) Tc = -a/Rb

Answer

A

Question 20. According to kinetic theory of gases, which one of the following statement(s) is/are correct?
(a) Real gas behave as ideal gas at high temperature and low pressure.
(b) Liquid state of ideal gas is impossible
(c) At any temerature and pressure, ideal gas obeys Boyle’s law and charles’ law
(d) The molecules of real gas do not exert any force on one another.

Answer

A

Question 21. For hydrogen gas Cp – Cv = a and for oxygen gas Cp – Cv = b. So, the relation between a and b is given by
(a) a = 16 b
(b) 16 a = b
(c) a = 4 b
(d) a = b

Answer

D

Question 22. The perfect gas equation for 4 gram of hydrogen gas is
(a) PV = RT
(b) PV = 2RT
(c) PV= 1/2RT
(d) PV = 4RT

Answer

B

Question 23. Maxwell’s laws of distribution of velocities shows that
(a) the number of molecules with most probable velocity is very large
(b) the number of molecules with most probable velocity is very small
(c) the number of molecules with most probable velocity is zero
(d) the number of molecules with most probable velocity is exactly equal to 1

Answer

A

Question 24. Boyle’s law is applicable for an
(a) adiabatic process
(b) isothermal process
(c) isobaric process
(d) isochoric process

Answer

B

Question 25. The relation between the gas pressure P and average kinetic energy per unit volume E is
(a) P = 1/2E
(b) P = E
(c) P = 3/2E
(d) P = 2/3E

Answer

D

Question 26. A cubic vessel (with face horizontal + vertical) contains an ideal gas at NTP. The vessel is being carried by a rocket which is moving at a speed of 500 m s–1 in vertical direction.
The pressure of the gas inside the vessel as observed by us on the ground
(a) remains the same because 500 ms–1 is very much smaller than vrms of the gas
(b) remains the same because motion of the vessel as a whole does not affect the relative motion of the gas molecules and the walls
(c) will increase by a factor equal to (v2rms + (500)2 ) / v2rms where vrms was the original mean square velocity of the gas
(d) will be different on the top wall and bottom wall of the vessel

Answer

B

Question 27. The r.m.s. velocity of oxygen molecule at 16ºC is 474 m/sec. The r.m.s. velocity in m/s of hydrogen molecule at 127ºC is
(a) 1603
(b) 1896
(c) 2230.59
(d) 2730

Answer

C

Question 28. 1 mole of H2 gas is contained in a box of volume V = 1.00 m3 at T =300 K. The gas is heated to a temperature of T = 3000 K and the gas gets converted to a gas of hydrogen atoms.
The final pressure would be (considering all gases to be ideal)
(a) same as the pressure initially
(b) 2 times the pressure initially
(c) 10 times the pressure initially
(d) 20 times the pressure initially

Answer

D

Question 29. If the critical temperature of a gas is 100ºC, its Boyle temperature will be approximately
(a) 337.5ºC
(b) 500ºC
(c) 33.3ºC
(d) 1000ºC

Answer

A

Question 30. If one mole of a monatomic gas (g = 5/3) is mixed with one mole of a diatomic gas (g = 7/3), the value of g for the mixture is
(a) 1.40
(b) 1.50
(c) 1.53
(d) 3.07

Answer

C

Question 31. The gases are at absolute temperature 300ºK and 350ºK respectively. The ratio of average kinetic energy of their molecules is
(a) 7 : 6
(b) 6 : 7
(c) 36 : 49
(d) 49 : 36

Answer

B

Question 32. The total degree of freedom of a CO2 gas molecule is
(a) 3
(b) 6
(c) 5
(d) 4

Answer

C

Question 33. The temperature of the mixture of one mole of helium and one mole of hydrogen is increased from 0°C to 100°C at constant pressure. The amount of heat delivered will be
(a) 600 cal
(b) 1200 cal
(c) 1800 cal
(d) 3600 cal

Answer

B

Question 34. The velocity of the molecules of a gas at temperature 120 K is v. At what temperature will the velocity be 2 v?
(a) 120 K
(b) 240 K
(c) 480 K
(d) 1120 K

Answer

C

Question 35. The density of a gas is 6 × 10–2 kg/m3 and the root mean square velocity of the gas molecules is 500 m/s. The pressure exerted by the gas on the walls of the vessel is
(a) 5×103 N/m2
(b) 1.2×10–4 N/m2
(c) 0.83×10–4 N/m2
(d) 30N/m2

Answer

A

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### Frequently Asked Question (FAQs)

How many MCQ questions are there in Class 11 chapter 13 Physics?

In Class 11 chapter 13 Physics, we have provided 35 Important MCQ Questions, But in the future, we will add more MCQs so that you can get good marks in the Class 11 exam.

Can we score good marks in Class 11 Physics with the help of Kinetic Theory MCQ Questions?

Yes, MCQ Question is one of the best strategies to make your preparation better for the CBSE Board Exam. It also helps to know the student’s basic understanding of each chapter. So, You can score good marks in the Class 11 Physics exam.