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CBSE Questions for Class 11 Engineering Physics Kinetic Theory Quiz 6 - MCQExams.com

The temperature of the sun, if pressure is 1.4×109 atm, density is 1.4gcm3 and average molecular weight is 2, will be
[Given R=8.4Jmol1K1]
  • 1.2×107K
  • 2.4×107K
  • 0.4×107K
  • 0.2×107K
What is new gauge pressure?
  • 1.82 atm
  • 1.70 atm
  • 1.92 atm
  • none
A barometer tube 90 cm long contains some air above mercury. The reading is 74.8 cm when true atmospheric pressure is 76 cm and temperature is 30o C. If the reading is observed to be 75.4 cm on a day when temperature is 10oC, then find the true pressure.
  • 76.07 cm
  • 75.6 cm
  • 76.57 cm
  • 77.123 cm
Equal masses of N2 and O2 gases are filled in vessels A and B. The volume of vessel B is double of A. The ratio of pressure in vessel A and B will be
  • 16 : 7
  • 16 : 14
  • 32 : 7
  • 32 : 28
At what temperature the average translational KE of the molecules of a gas will become equal to the KE of an electron accelerated from rest through 1 V potential difference?
  • 104K
  • 2.34×104K
  • 7.73×103K
  • none of these
One mole of an ideal gas undergoes a process P=Po1+(VVo)2, where Po and Vo are constants. Find the temperature of the gas when V=Vo.
  • PoVoR
  • 2PoVo3R
  • 2PoVoR
  • PoVo2R
What is C2 in terms of R?
  • 32R
  • 2R
  • 52R
  • 3R
The African bombardier beetle stenaptinus insignis can emit a jet of defensive spray from the movable tip of its abdomen. The beetle's body has reservoirs of two different chemicals. When the beetle is disturbed, these chemicals are combined in a reaction chamber producing a compounds that is warmed from 20oC to 100oC by the heat of reaction. The high pressure produced allows the compound to the sprayed out at speeds 19 ms1 scaring away predators of all kinds. Assume specific heat of two chemicals and the spray to be same as that of water [4.19×103J(kgK)1] and initial temperature of chemicals to be 20oC. How many times does the pressure increase?
  • 1.5
  • 2.3
  • 1.9
  • 1.28
The correct graph between PV and P of one mol of gas at constant temperature will be
A gas is filled in a container at any temperature and at pressure 76 cm of Hg. If at the same temperature the mass of gas is increased by 50% then the resultant pressure will be
  • 38 cm of Hg
  • 76 cm of Hg
  • 114 cm of Hg
  • 152 cm of Hg
In the gas equation PV=RT, V is the volume of
  • 1 mol of gas
  • 1 g of gas
  • gas
  • 1 litre of gas
The mean kinetic energy of gas molecules is zero at
  • 0oC
  • -273oC
  • 100 K
  • 100oC
If number of gas molecules in a cubical vessel is increased from N to 3N, then its pressure and total energy will become
  • four times
  • three times
  • double
  • half
At what temperature will the mean molecular energy of a perfect gas be one-third of its value of 27oC?
  • 10oC
  • 101K
  • 102K
  • 103J
The pressure of a gas in a container is 1011 pascal at 27oC. The number of molecules per unit volume of vessel will be
  • 6×1023cm3
  • 2.68×1019cm3
  • 2.5×106cm3
  • 2400cm3
The mean kinetic energy of a gas molecule at 27oC is 6.21 × 1021 Joule. Its value at 227o C will be
  • 12.35×1021Joule
  • 11.35×1021Joule
  • 10.35×1021Joule
  • 9.35×1021Joule
The value of γ of triatomic gas (linear arrangement) molecules is
  • 5/3
  • 7/5
  • 8/6
  • 9/7
At what temperature will the linear kinetic energy of a gas molecule be equal to that of an electron accelerated through a potential difference of 10V?
  • 273 K
  • 19×103K
  • 38.65×103
  • 11.3×103K
An enclosure of volume 3 litre contains 16g of oxygen, 7g of nitrogen and 11g of carbondioxide at 27oC. The pressure exerted by the mixture is approximately
  • 9 atmosphere
  • 8.3 atmosphere
  • 3 atmosphere
  • 1 atmosphere
The law of equipartition of energy is applicable to the system whose constituents are :
  • in random motion
  • in orderly motion
  • at rest
  • moving with constant speed
The pressure of a gas filled in a closed vessel increases by 0.4%. When temperature is increases by 1oC the initial temperature of the gas is
  • 250oC
  • 250 K
  • 250oF
  • 2500oC
The most probable velocity for monoatomic gas is
  • 3kTm
  • 8kTπm
  • 2kTm
  • zero
The dimension of universal gas constant R are
  • M2L2T2
  • ML2T2θ1
  • M2L2T2θ2
  • MLT2θ2
In outer space there are 10 molecules per cm3 on an average and the temperature there is 3K. The average pressure of this light gas is
  • 105Nm2
  • 5×1014Nm2
  • 0.4×1016Nm2
  • 4.14×1016Nm2
If the mean kinetic energy per unit volume of a gas is n times its pressure, then the value of n is
  • 4.5
  • 3.5
  • 2.5
  • 1.5
A cylinder contains 2kg of air at a pressure of 105Pa. If 2 kg more air is pumped into it, keeping the temperature constant, the pressure will be
  • 1010Pa
  • 2×105Pa
  • 105Pa
  • 0.5×105Pa
One mole of a gas at a pressure 2 Pa and temperature 27oC is heated till both pressure and volume are doubled. What is the temperature of the gas?
  • 1200 K
  • 900 K
  • 600 K
  • 300 K
What is number of degrees of freedom of an ideal diatomic molecule at ordinary temperature?
  • 7
  • 6
  • 5
  • 3
If the value of R = 2/5 Cv for a gas, then the atomicity of the gas will be:
  • monoatomic
  • diatomic
  • polyatomic
  • any of these
The internal energy of air in a room of volume 50 m3 at atmospheric pressure will be
  • 2.5 X 107 erg
  • 2.5 X 107 Joule
  • 5.255 X 107 Joule
  • 1.25 X 107 Joule
Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium?
  • Kinetic energy
  • Momentum
  • Density
  • Speed
The total kinetic energy of 8 litres of helium molecules at 5 atmosphere pressure will be
  • 6078 erg
  • 6078 Joule
  • 607 erg
  • 607 Joule
The Avogadro's number when to tends to infinity, the phenomenon of Brownian motion would
  • remain completely unaffected.
  • become more vigorous, than that observed with present finite value of Avogadro's number, for all sizes of the Brownian particles.
  • becomes more vigorous, than that observed with the present finite value of Avogadro's number, only for relatively large Brownian particle.
  • become practically unobservable as the molecular impact would tend to balance one another, for practically.
A product from a chemical industry passes through three states - gas, liquid, solid. The product is initially formed in gaseous state which is then liquefied and finally solidified. For same mass (say 5g) which state has maximum internal energy?
  • solid
  • liquid
  • gas
  • all have equal internal energy
The temperature of an ideal gas is increased from 27oC to 927oC. Then, the mean kinetic energy of gas molecules :
  • becomes 92727 times
  • becomes 92727 times
  • become double
  • become four times
In two vessels of the same volume, atomic hydrogen and helium with pressure 1 atm and 2 atm are filled. If temperature of both the same is the same, then the average speed of hydrogen atom vH will be related to helium vHe as
  • vH =2 vHe 
  • vH = vHe
  • vH = 2vHe
  • vH = vHe2
The air density at Mount Everest is less than that at the sea level. It is found by mountaineers that for one trip lasting a few hours, the extra oxygen needed by them corresponds to 30,000cc at sea level (pressure 1 atmosphere, temperature 27oC). Assume that the temperature around Mount Everest is -73oC and that the oxygen cylinder has a capacity of 5.2 litters. The pressure at which oxygen be filled (at site) in the cylinder is
  • 3.86 atm
  • 5.00 atm
  • 5.77 atm
  • 1 atm
Which of the following quantities is the same for all ideal gases at the same temperature?
  • The kinetic energy of 1 molecule
  • The kinetic energy of 1 g
  • The number of the molecules in 1 mole
  • The number of molecules in 1 g
Which of the following assumptions is/are true according to kinetic theory?
  • All matter is composed of small particles
  • The particles of matter are in constant motion
  • All collisions between the particles of matter are perfectly elastic
  • All of the above
Helium gas is filled in a closed vessel (having negligible thermal expansion coefficient). When it is heated from 300 K to 600 K, then average kinetic energy of helium atom will be :
  • 2
  • 2 times
  • unchanged
  • half
The top surface of a liquid behaves like stretched membrane because
  • The molecules below the top surface exert upward pressure
  • The molecules are attracted more to the sides of the containing vessel.
  • The molecules below the top surface attract the molecules above
  • none of the above
A gas mixture consists of 2moles of oxygen and 4moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
  • 4 RT
  • 15 RT
  • 9 RT
  • 11 RT
Choose the correct answer from the given options below.

Kinetic energy of the molecules ------------- with an increase in temperature 
  • increases
  • decreases
  • remains the same
  • increases then decreases
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 
  • mkT
  • P/kT
  • P/(kTV)
  • Pm/kT
If 2 mole of an ideal monatomic gas at temperature T0 is mixed with 4 moles of another ideal monatomic gas at temperature 2T0, then the temperature of the mixture is 
  •  53T0
  •  32T0
  •  43T0
  •  54T0
How many degrees of freedom are associated with 2grams of He at NTP?
  • 3
  • 3.01×1023
  • 9.03×1023
  • 6
Kinetic theory of matter states about :
  • three states of matter
  • differences between the three states of matter
  • fourth state of matter
  • all of the above
State whether true or false:
Linear molecules have 3N5 vibrational degrees of freedom, whereas non linear molecules have 3N6 vibrational degrees of freedom, where N is no. of atoms present in a molecule.
  • True
  • False
Maxwell's laws of distribution of velocities shows that
  • the number of molecules with most probable velocity is very large
  • the number of molecules with most probable velocity is small
  • the number of molecules with most probable velocity is zero
  • the number of molecules with most probable velocity is exactly equal to 1
A vessel contains air at a temperature of 150C and 60% R.H. What will be the R.H if it is heated to 200C? (S.V.P at 150C is 12.67 & at 200C is 17.36mm of Hg respectively)
  • 262%
  • 26.2%
  • 44.5%
  • 46.2%
0:0:4


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