JEE Questions for Physics Kinetic Theory Of Gases Quiz 2 - MCQExams.com

If universal gas constant is R, the essential heat require to increase the temperature from 273 K to 473 K at constant volume for an ideal gas of 4 mol is
  • 200 R
  • 400 R
  • 800 R
  • 1200 R
A bubble of 8 moles of helium is submerged at a certain depth in water. The temperature of water increases by 30°C. How much heat is added approximately to helium during expansion?
  • 4000 J
  • 3000 J
  • 3500 J
  • 4500 J
  • 5000 J
For an ideal gas
  • Cp is less than Cv
  • Cp is equal to Cv
  • Cp is greater than Cv
  • Cp = Cv = 0
Two moles of oxygen is mixed with eight moles of helium. The effective specific heat of the mixture at constant volume is
  • 1.3 R
  • 1.4 R
  • 1.7 R
  • 1.9 R
  • 1.2 R
The degrees of freedom of a molecule of a triatomic gas are
  • 2
  • 4
  • 6
  • 8
A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure p and temperature T, whereas the other part is completely evacuated. If the valve is suddenly opened, then the pressure and temperature of the gas will be

  • Physics-Kinetic Theory of Gases-75254.png
  • 2)
    Physics-Kinetic Theory of Gases-75255.png

  • Physics-Kinetic Theory of Gases-75256.png

  • Physics-Kinetic Theory of Gases-75257.png
An ideal gas is expanding such that pT2 = constant. The coefficient of volume expansion of the gas is

  • Physics-Kinetic Theory of Gases-75259.png
  • 2)
    Physics-Kinetic Theory of Gases-75260.png

  • Physics-Kinetic Theory of Gases-75261.png

  • Physics-Kinetic Theory of Gases-75262.png
Volume-temperature graph at atmospheric pressure for a monoatomic gas (V in m3 ,T in °C) is

  • Physics-Kinetic Theory of Gases-75264.png
  • 2)
    Physics-Kinetic Theory of Gases-75265.png

  • Physics-Kinetic Theory of Gases-75266.png

  • Physics-Kinetic Theory of Gases-75267.png
In a certain region of space, there are only 5 molecules per cm3 on an average and temperature is 3 K. The pressure of this dilute gas is (k = 138 × 10-23 JK-1)
  • 20.7 × 10-17 Nm-2
  • 15.3 × 10-15 Nm-1
  • 2.3 × 10-10 Nm-1
  • 5.3 × 10-5 Nm-1
  • 3.5 × 10-8 Nm-1
Which one of the following graphs represents the behaviour of an ideal gas?

  • Physics-Kinetic Theory of Gases-75270.png
  • 2)
    Physics-Kinetic Theory of Gases-75271.png

  • Physics-Kinetic Theory of Gases-75272.png

  • Physics-Kinetic Theory of Gases-75273.png
The rms velocity of gas molecules is 300 ms -1. The rms velocity of molecules of gas with twice the molecular weight and half the absolute temperature is
  • 300 ms -1
  • 600 ms -1
  • 75 ms -1
  • 150 ms -1
The molar specific heat at constant pressure of an ideal gas is 7/2 R. The ratio of specific heat at constant pressure to that ratio at constant volume is

  • Physics-Kinetic Theory of Gases-75398.png
  • 2)
    Physics-Kinetic Theory of Gases-75399.png

  • Physics-Kinetic Theory of Gases-75400.png

  • Physics-Kinetic Theory of Gases-75401.png
The molecules of a given mass of a gas have a rms velocity of 200 m/s at 27°C and 1.0 × 105 N/m2 pressure. When the temperature is 127°C and pressure is 0.5 × 105 N/m2, the rms velocity in m/s will be

  • Physics-Kinetic Theory of Gases-75276.png
  • 2)
    Physics-Kinetic Theory of Gases-75277.png

  • Physics-Kinetic Theory of Gases-75278.png
  • None of these
Kinetic energy per unit volume is E. The pressure exerted by the gas is given by

  • Physics-Kinetic Theory of Gases-75280.png
  • 2)
    Physics-Kinetic Theory of Gases-75281.png

  • Physics-Kinetic Theory of Gases-75282.png

  • Physics-Kinetic Theory of Gases-75283.png
1 kg of a diatomic gas is at a pressure of 8 × 104 Nm-2. The density of the gas is 4 kgm-3. What is the energy of the gas due to its thermal motion?
  • 3 × 104 J
  • 5 × 104 J
  • 6 × 104 J
  • 7 × 104 J
A vessel contains 32 g of O2 at a temperature T. The pressure of the gas is p. An identical vessel containing 4 g of H2at a temperature 2T has a pressure of
  • 8p
  • 4p
  • p

  • Physics-Kinetic Theory of Gases-75286.png

Physics-Kinetic Theory of Gases-75288.png
  • 1.40
  • 1.50
  • 1.53
  • 3.07
The mean kinetic energy of one mole of gas per degree of freedom (on the basis of kinetic theory of gases) is

  • Physics-Kinetic Theory of Gases-75290.png
  • 2)
    Physics-Kinetic Theory of Gases-75291.png

  • Physics-Kinetic Theory of Gases-75292.png

  • Physics-Kinetic Theory of Gases-75293.png
If γ is the ratio of specific heat and R is the universal gas constant, then the molar specific heat at constant volume Cv is given by

  • Physics-Kinetic Theory of Gases-75295.png
  • 2)
    Physics-Kinetic Theory of Gases-75296.png

  • Physics-Kinetic Theory of Gases-75297.png

  • Physics-Kinetic Theory of Gases-75298.png
The volume of a gas at pressure 21 × 104 Nm–2 and temperature 27o C is 83 Litres. If R = 8.3 J mol–1K–1. Then the quantity of gas in g–mole will be
  • 42
  • 7
  • 14
  • 15
The ratio of mean kinetic energy of hydrogen and oxygen at a given temperature is
  • 1:8
  • 1:4
  • 1:16
  • 1:1
At what temperature is the kinetic energy of a gas molecule double that of its value at 27o C
  • 54o C
  • 108o C
  • 327o C
  • 300o C
At O K which of the follwing properties of a gas will be zero
  • Kinetic energy
  • Density
  • Potential energy
  • Vibrational energy
The average kinetic energy of hydrogen molecules at 300 K is E. At the same temperature the average kinetic energy of oxygen molecules will be

  • Physics-Kinetic Theory of Gases-75302.png
  • E
  • 4E

  • Physics-Kinetic Theory of Gases-75303.png
Root mean square velocity of a molecule is v at pressure P. If pressure is increased two times, then the rms velocity becomes
  • 3v
  • 2v
  • 0.5v
  • v
The rms. speed of the molecules of a gas in a vessel is 400 ms–1. If half of the gas leaks out, at constant temperature, the r.m.s speed of the remaining molecules will be
  • 800 ms–1
  • 200 ms–1
  • 400√2 ms–1
  • 400 ms–1
The degrees of freedom for triatomic gas is ______ (At room temperature)
  • 8
  • 6
  • 4
  • 2

Physics-Kinetic Theory of Gases-75305.png
  • Diatomic
  • monoatomic
  • polyatomic
  • mixture of diatomic and polyatomic molecules
The specific heats at constant pressure is greater than that of the same gas at constant volume because
  • At constant volume work is done in expanding the gas
  • At constant pressure work is done in expanding the gas
  • The molecular vibration increases more at constant pressure
  • The molecular attraction increases more at constant pressure
For a gas γ = 7/5, the gas may probably be
  • Neon
  • Argon
  • Helium
  • Hydrogen

Physics-Kinetic Theory of Gases-75308.png
  • If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
  • If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion.
  • If Assertion is true; the Reason is false.
  • If Assertion is false, but the reason is true.
Assertion : Mean free path of gas 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 correct explanation of the Assertion
  • If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
  • If Assertion is true; the Reason is false
  • If Assertion is false, but the reason is true
Three perfect gases at absolute temperatures T1, T2 and T3 are mixed. The masses of molecules are m1, m2 and m3 and the number of molecules are n1, n2 and n3 respectively. Assuming no loss of energy, the final temperature of the mixture is

  • Physics-Kinetic Theory of Gases-75309.png
  • 2)
    Physics-Kinetic Theory of Gases-75310.png

  • Physics-Kinetic Theory of Gases-75311.png

  • Physics-Kinetic Theory of Gases-75312.png
The temperature of an ideal gas at atmospheric pressure is 300 K and volume 1 m3. If temperature and volume become double, then pressure will be

  • Physics-Kinetic Theory of Gases-75314.png
  • 2)
    Physics-Kinetic Theory of Gases-75315.png

  • Physics-Kinetic Theory of Gases-75316.png

  • Physics-Kinetic Theory of Gases-75317.png
At 100 K and 0.1 atmospheric pressure, the volume of helium gas is 10 litres. If volume and pressure are doubled, its temperature will change to
  • 127 K
  • 400 K
  • 25 K
  • 200 K
An electron tube was sealed off during manufacture at a pressure of 1.2 × 10–7 mm of mercury at 27oC. Its volume is 100 cm3. The number of molecules that remain in the tube is _______(density of mercury is 13.6 g cm–3)
  • 3.9 × 1011
  • 3 × 1016
  • 2 × 1014
  • 7 × 1011
A vessel contains 1 mole of O2 gas (relative molar massat a temperature T. The pressure of the gas is P. An identical vessel containing 1 mole of He gas (relative molar massat a temperature 2 T has pressure of ..........
  • 8 P
  • P/8
  • 2 P
  • P
At a given volume and temperature the pressure of a gas
  • Varies inversely as the square of its mass
  • Varies inversely as its mass
  • is independent of its mass
  • Varies linearly as its mass
The product of the pressure and volume of an ideal gas is
  • A constant
  • Directly proportional to its temperature
  • Inversely proportional to its temperature
  • Approx. equal to the universal gas constant
Air is pumped into an automobile tube upto a pressure of 200 kPa in the morning when the air temperature is 22o C. During the day, temperature rises to 42o C and the tube expands by 2% The pressure of the air in the tube at this temperature will be approximately.
  • 209 kPa
  • 206 kPa
  • 200 kPa
  • 212 kPa
2g of O2 gas is taken at 27o C and pressure 76 cm Hg. Find out volume of gas (ln liter)
  • 3.08
  • 44.2
  • 1.53
  • 2.44
1 mole of gas occupies a volume of 100 ml at 50 mm pressure. What is the volume occupied by two moles of gas at 100 mm pressure and at same temperature
  • 50 ml
  • 200 ml
  • 100 ml
  • 500 ml
The temperature of a gas at pressure P and volume V is 27o C Keeping its volume constant if its temperature is raised to 927o C, then its pressure will be
  • 3 P
  • 2 P
  • 4 P
  • 6 P
At what temperature volume of an ideal gas becomes triple
  • 819o C
  • 182o C
  • 646o C
  • 546o C
To double the volume of a given mass at an ideal gas at 27o C keeping the pressure constant one must raise the temperature in degree centigrade
  • 54o
  • 600o
  • 327o
  • 270o
At on 0o C pressure measured by barometer is 760 mm. what will be pressure at 100o C
  • 780 mm
  • 760 mm
  • 730 mm
  • None of these
A gas at 27o C has a volume V and pressure P. On heating its pressure is doubled and volume becomes three times. The resulting temperature of the gas will be
  • 1527o C
  • 600o C
  • 162o C
  • 1800o C
A perfect gas at 27o C is heated at constant pressure to 327o C. If original volume of gas at 27o C is V then volume at 327o C is
  • 2 V
  • V
  • V/2
  • 3 V
A vessel contains 1 mole of O2 gas (molar massat a temperature T. The pressure of the gas is P. An identical vessel containing one mole of He gas (molar massat temperature 2T has a pressure of
  • 2 P
  • P
  • 8 P
  • P/8
The pressure is exerted by the gas on the walls of the container because
  • It sticks with the walls
  • It is accelerated towards the walls
  • It loses kinetic energy
  • On collision with the walls there is a change in momentum
0:0:1


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