JEE Questions for Physics Kinetic Theory Of Gases Quiz 12 - MCQExams.com

The diameter of oxygen molecule is 2.94 × 10–10m. The van der Waal\'s gas constant ‘b\' in m3/mol will be
  • 3.2
  • 16
  • 32 × 10–4
  • 32 × 10–6
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
  • 600 cal
  • 1200 cal
  • 1800 cal
  • 3600 cal
A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at 300 K. The ratio of the average rotational kinetic energy per O2 molecule to that per N2molecule is
  • 1 : 1
  • 1 : 2
  • 2 : 1
  • Depends on the moment of inertia of the two molecules
A vessel contains 14 g (7 moles) of hydrogen and 96 g (9 moles) of oxygen at S.T.P. Chemical reaction is induced by passing electric spark in the vessel till one of the gases is consumed. The temperature is brought back to it\'s starting value 273 K. The pressure in the vessel is
Physics-Kinetic Theory of Gases-76143.png
  • 0.1 atm
  • 0.2 atm
  • 0.3 atm
  • 0.4 atm
A jar contains a gas and few drops of water at T K. The pressure in the jar is 830 mm of mercury. The temperature of jar is reduced by 1%. The saturated vapour pressure of water at the two temperatures are 30 mm and 25 mm of mercury. Then the new pressure in the jar will be
  • 917 mm of Hg
  • 717 mm of Hg
  • 817 mm of Hg
  • None of these
Molar specific heat of oxygen at constant pressure CP = 7.2 cal/mol° C and R = 8.3 Joule/ mol K. At constant volume, 5 mol of oxygen is heated from 10°C to 20°C, the quantity of heat required is approximately
  • 25 cal
  • 50 cal
  • 250 cal
  • 500 cal
One mole of an ideal gas required 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 the same 10 K, the heat required is
(Given the gas constant R = 8.3 J/mol-K)
  • 198.7 J
  • 29 J
  • 215.3 J
  • 124 J
Pressure versus temperature graph of an ideal gas are as shown in figure. Choose the wrong statement
Physics-Kinetic Theory of Gases-76225.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
The expansion of an ideal gas of mass m at a constant pressure P is given by the straight line D. Then the expansion of the same ideal gas of mass 2m at apressure P/2 is given by the straight line
Physics-Kinetic Theory of Gases-76148.png
  • E
  • C
  • B
  • A
An experiment is carried on a fixed amount of gas at different temperatures and at high pressure, such that it deviates from the ideal gas behaviour. The variation ofPV/RT with P is shown in the diagram. The correct variation will correspond to
Physics-Kinetic Theory of Gases-76150.png
  • Curve A
  • Curve B
  • Curve C
  • Curve D
The graph which represents the variation of mean kinetic energy of molecules with temperature t°C is

  • Physics-Kinetic Theory of Gases-76152.png
  • 2)
    Physics-Kinetic Theory of Gases-76153.png

  • Physics-Kinetic Theory of Gases-76154.png

  • Physics-Kinetic Theory of Gases-76155.png
The expansion of unit mass of a perfect gas at constant pressure is shown in the diagram. Here
Physics-Kinetic Theory of Gases-76157.png
  • a = volume, b = °C temperature
  • a = volume, b = K temperature
  • a = °C temperature,b = volume
  • a = K temperature, b = volume
Pressure versus temperature graph of an ideal gas of equal number of moles of different volumes are plotted as shown in figure. Choose the correct alternative
Physics-Kinetic Theory of Gases-76159.png
  • V1= V2, V3 = V4 and V2> V3
  • V1 = V2, V3 = V4 and V2< V3
  • V1 = V2= V3 = V4
  • V4> V3> V2> V1

Physics-Kinetic Theory of Gases-76161.png
  • (i) only
  • (i) and (ii) only
  • All of these
  • None of the above
Graph of specific heat at constant volume for a monoatomic gas is

  • Physics-Kinetic Theory of Gases-76163.png
  • 2)
    Physics-Kinetic Theory of Gases-76164.png

  • Physics-Kinetic Theory of Gases-76165.png

  • Physics-Kinetic Theory of Gases-76166.png
A pressure P-absolute temperature T diagram was obtained when a given mass of gas was heated. During the heating process from the state to state 2 the volume
Physics-Kinetic Theory of Gases-76168.png
  • Remained constant
  • Decreased
  • Increased
  • Changed erratically
A volume V and pressure P diagram was obtained from state 1 to state 2 when a given mass of a gas is subjected to temperature changes. During this process the gas is
Physics-Kinetic Theory of Gases-76170.png
  • Heated continuously
  • Cooled continuously
  • Heated in the beginning and cooled towards the end
  • Cooled in the beginning and heated towards the end
The change in volume V with respect to an increase in pressure P has been shown in the figure for a non-ideal gas at four different temperatures T1, T2, T3 and T4. The critical temperature of the gas is
Physics-Kinetic Theory of Gases-76172.png
  • T1
  • T2
  • T3
  • T4
In the adjoining figure, various isothermals are shown for a real gas. Then
Physics-Kinetic Theory of Gases-76173.png
  • EF represents liquification
  • CB represents liquification
  • HI represents the critical temperature
  • AB represents gas at a high temperature
From the following P-T graph what inference can be drawn?
Physics-Kinetic Theory of Gases-76174.png
  • V2>V1
  • V2< V1
  • V2 = V1
  • None of these
PV versus T graph of equal masses of H2, He and O2 is shown in fig. Chooses the correct alternative
Physics-Kinetic Theory of Gases-76176.png
  • C corresponds to H2, B to He and A to O2
  • A corresponds to He, B to H2 and C to O2
  • A corresponds to He, B to O2 and C to H2
  • A corresponds to O2, B to H2 and C to He
Pressure versus temperature graph of an ideal gas at constant volume V of an ideal gas is shown by the straight line A. Now mass of the gas is doubled and the volume is halved, then the corresponding pressure versus temperature graph will be shown by the line
Physics-Kinetic Theory of Gases-76177.png
  • A
  • B
  • C
  • None of these
Two different isotherms representing the relationship between pressure p and volume V at a given temperature of the same ideal gas are shown for masses m1 and m2 of the gas respectively in the figure given, then
Physics-Kinetic Theory of Gases-76179.png

  • Physics-Kinetic Theory of Gases-76180.png
  • 2)
    Physics-Kinetic Theory of Gases-76181.png

  • Physics-Kinetic Theory of Gases-76182.png

  • Physics-Kinetic Theory of Gases-76183.png
Two different masses m and 3m of an ideal gas are heated separately in a vessel of constant volume, the pressure P and absolute temperature T, graphs for these two cases are shown in the figure as A and B. The ratio of slopes of curves B to A is
Physics-Kinetic Theory of Gases-76185.png
  • 3 : 1
  • 1 : 3
  • 9 : 1
  • 1 : 9
Under constant temperature graph between P and 1/V is
  • Parabola
  • Hyperbola
  • Straight line
  • Circle
Which one of the following graphs represents the behaviour of an ideal gas

  • Physics-Kinetic Theory of Gases-76188.png
  • 2)
    Physics-Kinetic Theory of Gases-76189.png

  • Physics-Kinetic Theory of Gases-76190.png

  • Physics-Kinetic Theory of Gases-76191.png

Physics-Kinetic Theory of Gases-76192.png

  • Physics-Kinetic Theory of Gases-76193.png
  • 2)
    Physics-Kinetic Theory of Gases-76194.png

  • Physics-Kinetic Theory of Gases-76195.png

  • Physics-Kinetic Theory of Gases-76196.png
Assertion : In pressure-temperature (P–T) phase diagram of water, the slope of the melting curve is found to be negative.
Reason : Ice contracts on melting to water
  • 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.

Physics-Kinetic Theory of Gases-76198.png
  • 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 : A gas has a unique value of specific heat.
Reason : Specific heat is defined as the amount of heat required to raise the temperature of unit mass of the substance through unit degree.
  • 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 : A gas can be liquified at any temperature by increase of pressure alone.
Reason : On increasing pressure the temperature of gas decreases.
  • 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.
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-76223.png
  • 1 : 6
  • 6 : 1
  • 4 : 1
  • 1 : 4
Assertion : Equal masses of helium and oxygen gases are given equal quantities of heat. There will be a greater rise in the temperature of helium compared to that of oxygen.
Reason : The molecular weight of oxygen is more than the molecular weight of helium.
  • 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 : Absolute zero is the temperature corresponding to zero energy.
Reason : The temperature at which no molecular motion cease is called absolute zero 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 : The ratio of specific heat gas at constant pressure and specific heat at constant volume for a diatomic gas is more than that for a monoatomic gas.
Reason : The molecules of monoatomic gas have more degree of freedom than those of a diatomic gas.
  • 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 : Mean free path of a gas molecules varies inversely as density of the gas.
Reason : Mean free path varies inversely as pressure of the gas.
  • 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 : Specific heat of a gas at constant pressure (CP)is greater than its specific heat at constant volume (CV).
Reason: At constant pressure, some heat is spent in expansion of the gas.
  • 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 internal energy of a real gas function of both, temperature and volume.
Reason : Internal kinetic energy depends on temperature and internal potential energy depends on volume.
  • 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 : For an ideal gas, at constant temperature, the product of the pressure and volume is constant.
Reason : The mean square velocity of the molecules is inversely proportional to mass.
  • 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 : If a gas container in motion is suddenly stopped, the temperature of the gas rises.
Reason : The kinetic energy of ordered mechanical motion is converted in to the kinetic energy of random motion of gas molecules.
  • 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 : Internal energy of an ideal gas does not depend upon volume of the gas
Reason : Internal energy of ideal gas depends on temperature of gas
  • 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 : 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 : r.m.s 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-76207.png
  • A
  • B
  • C
  • D
When the temperature of a gas is raised from 27°C to 90°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-76211.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 300K. Now if one vessel is immersed in a bath of constant temperature 600K and the other in a bath of constant temperature 300K. Then the common pressure will be
Physics-Kinetic Theory of Gases-76213.png
  • 1 atm
  • 4/5atm
  • 4/3atm
  • 3/4atm
The r.m.s velocity of a gas at a certain temperature is √2 times than that of the oxygen molecules at that temperature. The gas can be
  • H2
  • He
  • CH4
  • SO2
At what temperature, the mean kinetic energy of O2will be the same for H2 molecules at –73 °C
  • 127°
  • 527°C
  • –73° C
  • –173° C
0:0:1


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