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Kinetic Theory Class 11 MCQs Questions with Answers
Solving the Kinetic Theory Multiple Choice Questions of Class 11 Physics Chapter 13 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Kinetic Theory Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 13 Physics Class 11 and cross-check your answers during preparation.
Question 1.
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
Answer
Answer: (a) H²
Question 2.
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
Answer: (a) Latent heat of fusion
Question 3.
One any planet, the presence of atmosphere implies [nrms = root mean square velocity of molecules and ne = escape velocity]
(a) nrms << ne
(b) nrms > ne
(c) nrms = ne
(d) nrms = 0
Answer
Answer: (a) nrms << ne
Question 4.
Calculate the RMS velocity of molecules of a gas of which the ratio of two specific heats is 1.42 and velocity of sound in the gas is 500 m/s
(a) 727 m/s
(b) 527 m/s
(c) 927 m/s
(d) 750 m/s
Answer
Answer: (a) 727 m/s
Question 5.
The r.m.s. speed of the molecules of a gas in a vessel is 200 m/s. if 25% of the gas leaks out of the vessel, at constant temperature, then the r.m.s. speed of the remaining molecules will be
(a) 400 m/s
(b) 150 m/s
(c) 100 m/s
(d) 200 m/s
Answer
Answer: (d) 200 m/s
Question 6.
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
Answer
Answer: (b) Doubled
Question 7.
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
Answer
Answer: (c) The r.m.s. velocity of all the gas molecules is more then the escape velocity of the moons surface
Question 8.
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
Answer
Answer: (c) Latent heat of fusion
Question 9.
One mole of ideal gas required 207 J heat to rise the temperature by 10°K when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by the same 10°K the heat required is (R = 8/3 J/mole °K)
(a) 1987 J
(b) 29 J
(c) 215.3 J
(d) 124 J
Answer
Answer: (d) 124 J
Question 10.
The r.m.s velocity of the molecules of an ideal gas is C at a temperature of 100K. at what temperature is r.m.s. velocity will be doubted?
(a) 200 K
(b) 400 K
(c) 300 K
(d) 50 K
Answer
Answer: (b) 400 K
Question 11.
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
Answer
Answer: (b) 124 J
Question 12.
5 gm of air is heated from 273°K to 275°K. the change in internal energy of air will be (CV = 172 cal/kg °K and 4.2 J/cal)
(a) 7.22 J
(b) 5.22 J
(c) 8.16 J
(d) 3.5 J
Answer
Answer: (a) 7.22 J
Question 13.
The specific heat of a gas in isothermal process is
(a) Zero
(b) Negative
(c) Remains constant
(d) Infinite
Answer
Answer: (d) Infinite
Question 14.
The internal energy of one mole of an ideal gas depend upon
(a) Volume of gas
(b) Temperature of gas
(c) Nature of gas
(d) Density of gas
Answer
Answer: (b) Temperature of gas
Question 15.
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
Answer
Answer: (b) J/kg°c
Question 16.
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
Answer: (b) Double the value at 200 K
Question 17.
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
Answer: (c) 3 moles of gas
Question 18.
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
Answer
Answer: (c) 15 10-20 J
Question 19.
At constant volume temperature is increased then
(a) Collision on walls will be less
(b) Collision frequency will be increases
(c) Collision will be in straight line
(d) Collision will not change
Answer
Answer: (b) Collision frequency will be increases
Question 20.
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
Answer
Answer: (c) Hydrogen
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