JEE Questions for Physics Kinetic Theory Of Gases Quiz 8 - MCQExams.com

Assertion Air pressure in a car tyre increases during driving.
Reason Absolute zero temperature is not zero energy temperature.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Maxwell speed distribution graph is symmetric about most probable speed.
Reason rms speed of ideal gas, depends upon it\'s type (monoatomic, diatomic and polyatomic).
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The root mean square and most probable speeds of the molecules in a gas are the same.
Reason The maxwell distribution for the speed of molecules in a gas is symmetrical.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
An ideal gas has an initial pressure of 3 pressure units and an initial volume of 4 volume units. The table gives the final pressure and volume of the gas (in those same units) in four, processes. Which processes start and end on the same isotherm
Physics-Kinetic Theory of Gases-75773.png
  • A
  • B
  • C
  • D
Suppose ideal gas equation follows VP3 = constant. Initial temperature and volume of the gas are T and V respectively. If gas expands to 27V then its temperature will become
  • T
  • 9T
  • 27 T
  • T/9

Physics-Kinetic Theory of Gases-75776.png
  • 1.37
  • 1.34
  • 1.55
  • 1.63
When the temperature of a gas is raised from 27o C to 90o C, the percentage increase in the r.m.s. velocity of the molecules will be
  • 10%
  • 15%
  • 20%
  • 17.5%

Physics-Kinetic Theory of Gases-75779.png
  • 1 × 10–3 m3
  • 2 × 10–3 m3
  • 3 × 10–3 m3
  • 4 × 10–3 m3
Two spherical vessel of equal volume, are connected by a narrow tube. The apparatus contains an ideal gas at one atmosphere and 300 K. Now if one vessel is immersed in a bath of constant temperature 600 K and the other in a bath of constant temperature 300 K. Then the common pressure will be
Physics-Kinetic Theory of Gases-75781.png
  • 1 atm
  • 2)
    Physics-Kinetic Theory of Gases-75782.png

  • Physics-Kinetic Theory of Gases-75783.png

  • Physics-Kinetic Theory of Gases-75784.png
The rms velocity of a gas at a certain temperature is √2 times than that of the oxygen molecules at the temperature. The gas can be
  • H2
  • He
  • CH4
  • SO2
At what temperature, the mean kinetic energy of O2 will be the same for H2 molecules at –73°C
  • 127°C
  • 527°C
  • –73 °C
  • –173°C
The volume of a gas at pressure 21 × 104 N / m2 and temperature 27°C is 83 litres. If R = 8.3 J/mol K, then the quantity of gas in g-mole will be
  • 15
  • 42
  • 7
  • 14
The pressure and temperature of an ideal gas in a closed vessel are 720 kPa and 40°C respectively. If 1/4th of the gas is released from the vessel and the temperature of the remaining gas is raised to 353°C, the final pressure of the gas is
  • 1440 kPa
  • 1080 kPa
  • 720 kPa
  • 540 kPa
An air bubble doubles its radius on raising from the bottom of water reservoir to be the surface of water in it. If the atmospheric pressure is equal to 10 m of water, the height of water in the reservoir is
Physics-Kinetic Theory of Gases-75790.png
  • 10 m
  • 20 m
  • 70 m
  • 80 m
If the rms velocity of a gas at a given temperature (Kelvin scale) is 300 m/s. What will be the r.m.s. velocity of a gas having twice the molecular weight and half the temperature on Kelvin scale is equal to
  • 300 m/s
  • 600 m/s
  • 75 m/s
  • 150 m/s

Physics-Kinetic Theory of Gases-75793.png
  • 1.33
  • 1.40
  • 1.29
  • 1.66
A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments. The ratio of the number of molecules in compartments I and II is
Physics-Kinetic Theory of Gases-75795.png
  • 1 : 6
  • 6 : 1
  • 4 : 1
  • 1 : 4
Pressure versus temperature graph of an ideal gas are as shown in figure. Choose the wrong statement
Physics-Kinetic Theory of Gases-75797.png
  • Density of gas is increasing in graph (i)
  • Density of gas is decreasing in graph (ii)
  • Density of gas is constant in graph (iii)
  • None of the above

Physics-Kinetic Theory of Gases-75799.png
  • 11 g
  • 22 g
  • 33 g
  • 44 g
A cylinder of fixed capacity 44.8 litres contains a monoatomic gas at standard temperature and pressure. The amount of heat required to cylinder by 10°C will be (R = Universal gas constant)
  • R
  • l0R
  • 20R
  • 30R
A pressure cooker contains air at 1 atm and 30°C. If the safety value of the cooker blows when the inside pressure ≥ 3 atm, then the maximum temperature of the air, inside the cooker can be
  • 90°C
  • 636°C
  • 909°C
  • 363°C
One mole of an ideal monoatomic gas requires 210 J heat to raise the temperature by 10 K, when heated at constant temperature. If the same gas is heated at constant volume to raise the temperature by 10 K, then heat required is
  • 238 J
  • 126 J
  • 210 J
  • 350 J
From the following V–T diagram we can conclude
Physics-Kinetic Theory of Gases-75804.png
  • P1 = P2
  • P1 > P2
  • P1 < P2
  • None of these
A cylinder contains 10 kg of gas at pressure of 107 N/m2. The quantity of gas taken out of the cylinder, if final pressure is 2.5 × 106 N/m2, will be (Temperature of gas is constant)
  • 15.2 kg
  • 3.7 kg
  • Zero
  • 7.5 kg
Certain amount of an ideal gas is contained in a closed vessel. The vessel is moving with a constant velocity v. The molecular mass of gas is M. The rise in temperature of the gas when the vessel is suddenly stopped is (γ = CP/CV)

  • Physics-Kinetic Theory of Gases-75807.png
  • 2)
    Physics-Kinetic Theory of Gases-75808.png

  • Physics-Kinetic Theory of Gases-75809.png

  • Physics-Kinetic Theory of Gases-75810.png
Air is filled at 60°C in a vessel of open mouth. The vessel is heated to a temperature T so that 1/4 th part of air escapes. Assuming the volume of the vessel remaining constant, the value of T is
  • 80°C
  • 444°C
  • 333°C
  • 171°C
The average momentum of a molecule in an ideal gas depends on
  • Temperature
  • Volume
  • Molecular mass
  • None of these
Mean free path of gas molecules of constant temperature is inversely proportional to
  • P
  • V
  • m
  • n (number density)
The temperature of a gas at pressure P and volume V is 27°C. Keeping its volume constant if its temperature is raised to 927°C, then its pressure will be
  • 2 P
  • 3 P
  • 4 P
  • 6 P
Boyle\'s law holds for an ideal gas during
  • Isobaric changes
  • Isothermal changes
  • Isochoric changes
  • Isotonic changes
S.I. unit of universal gas constant is
  • cal/°C
  • J/mol
  • J mol–1K–1
  • J/kg
Figure shows two flasks connected to each other. The volume of the flask 1 is twice that of flask 2. The system is filled with an ideal gas at temperature 100 K and 200 K respectively. If the mass of the gas in 1 be m, then what is the mass of the gas in flask 2?
Physics-Kinetic Theory of Gases-75814.png
  • m
  • m/2
  • m/4
  • m/8
At constant pressure, the ratio of increase in volume of an ideal gas per degree rise in kelvin temperature to it\'s original volume is (T = Absolute temperature of the gas)
  • T2
  • T
  • 1/T
  • 1/T2
The volume of gas at 20°C is 200 ml. If the temperature is reduced to –20°C at constant pressure, its volume will be
  • 172.6 ml
  • 17.26 ml
  • 192.7 ml
  • 19.27 ml
Two gases of equal mass are in thermal equilibrium. If Pa, Pb and Va, Vbare their respective pressures and volumes, then which relation is true?

  • Physics-Kinetic Theory of Gases-75818.png
  • 2)
    Physics-Kinetic Theory of Gases-75819.png

  • Physics-Kinetic Theory of Gases-75820.png

  • Physics-Kinetic Theory of Gases-75821.png
Equation of gas in terms of pressure (P), absolute temperature (T) and density (d) is

  • Physics-Kinetic Theory of Gases-75823.png
  • 2)
    Physics-Kinetic Theory of Gases-75824.png

  • Physics-Kinetic Theory of Gases-75825.png

  • Physics-Kinetic Theory of Gases-75826.png
In Boyle\'s law what remains constant
  • PV
  • TV
  • V / T
  • P / T
The vapour of a substance behaves as a gas
  • Below critical temperature
  • Above critical temperature
  • At 100°C
  • At 1000°C
If the volume of the gas containing n number of molecules is V, then the pressure will decrease due to force of intermolecular attraction in the proportion
  • n/V
  • n/V2
  • (n/V)2
  • 1/V2
A tyre kept outside in sunlight bursts off after sometime because of
  • Increases in pressure
  • Increases in volume
  • Both of (a) and (b)
  • None of these
To decrease the volume of a gas by 5% at constant temperature, the pressure should be
  • Decreased by 5.26%
  • Increased by 5.26%
  • Decreased by 11%
  • Increased by 11%
The temperature of an ideal gas at atmosphere pressure is 300 K and volume 1 m3. If temperature and volumebecome double, then pressure will be
  • 105 N/m2
  • 2 × 105 N/m2
  • 0.5 × 105 N/m2
  • 4 × 105 N/m2
If pressure of a gas contained in a closed vessel is increased by 0.4% when heated by 1°C, the initial temperature must be
  • 250 K
  • 250°C
  • 2500 K
  • 25°C
At what temperature volume of an ideal gas at 0°C becomes
  • 546°C
  • 182°C
  • 819°C
  • 646°C
To double the volume of a given mass of an ideal gas at 27°C keeping the pressure constant, one must raise the temperature in degree centigrade to
  • 54°
  • 270°
  • 327°
  • 600°
Which of the following statements about kinetic theory of gases is wrong?
  • The molecules of a gas are in continuous random motion
  • The molecules continuously undergo inelastic collisions
  • The molecules do not interact with each other except during collisions
  • The collisions amongst the molecules are of short duration
If a van der-Waal\'s gas expands freely, then final temperature is
  • Less than the initial temperature
  • Equal to the initial temperature
  • More than the initial temperature
  • Less or more than the initial temperature depending on the nature of the gas
Air is pumped into an automobile tube upto a pressure of 200 kPa in the morning, when the air temperature is 22°C. During the day, temperature rises to 42°C and the tube expands by 2%. The pressure of the air in the tube at this temperature, will be approximately
  • 212 kPa
  • 209 kPa
  • 206 kPa
  • 200 kPa
The relationship between pressure and the density of a gas expressed by Boyle\'s law, P = KD holds true
  • For any gas under any conditions
  • For some gases under any conditions
  • Only if the temperature is kept constant
  • Only if the density is constant
On 0°C pressure measured by barometer is 760 mm.What will be pressure at 100°C
  • 760 mm
  • 730 mm
  • 780 mm
  • None of these
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