NEET Physics Chapter Wise Mock Test – Behaviour of Perfect Gas and Kinetic Theory

NEET Physics Chapter Wise Mock Test – Behaviour of Perfect Gas and Kinetic Theory

Question 1:
The volume of a given mass of a gas at 27°C. 1 atm is 100 cc. What wili be its volume at 327°C?
(a) 50cc
(b) 100cc
(c) 150cc
(d) 200cc

Question 2:
Critical temperature of C0₂ is 31.2° C. In summer, the room temperature is40°C.
(a) C0₂ cannot be liquefied
(b) Can be liquefied with increase of pressure
(c) Can be liquefied with decrease of pressure
(d) Can be liquefied, if temperature of C0₂ is decreased below 31.2° C

Question 3:
A cylinder contains 20 kg of N₂ gas (M = 28 kg kmol^-1) at a pressure of 5 atm. The mass of hydrogen (M = 2 kg kmol^-1) at a pressure of 3 atm contained in the same cylinder at same temperature is
(a) 1.08 kg
(b) 0.86 kg
(c) 0.68 kg
(d) 1.68 kg

Question 4:
A vessel contains 1 mole of O₂ gas (molar mass 32) at temperature 7. The pressure of the gas is p. An identical vessel containing 1 mole of H₂ gas (molar mass 4) at temperature 27 has a pressure of
(a) p/8
(b) p
(c) 2p
(d) 8p

Question 5:
The equation of state for 5g of oxygen at a pressure p and temperature 7, when occupying a volume V, will be
(a) pV = (5/32)RT
(b) pV = 5RT
(c) pV = (5/2)RT
(d) pV= (5/16)RT

Question 6:

Question 7:

Question 8:

Question 9:
At what temperature, the mean kinetic energy of 02 will be the same as that of H₂ molecules at – 73°C?
(a) 127°C
(b) 527°C
(c) -73°C
(d) -173°C

Question 10:

Question 11:
The temperature at which the root mean square speed of a gas will be half its value at 0°C is (assume the pressure remains constant)
(a) – 86.4°C
(b) – 204.75°C
(c) -104.75°C
(d) -68.25°C

Question 12:
The molecules of a given mass of gas have rms speed 200 ms^-1 at 27°C and 105 Nm^-2 pressure. When the absolute temperature is doubled and the pressure is halved, the rms speed of the molecules of the same gas is
(a) 200 ms^-1
(b) 400 ms^-1
(c) 200 √2 ms^-1
(d) 400 √2 ms^-1

Question 13:
Two molecules of a gas have speeds of 9×10⁶ m/s and 1×10⁶m/s, respectively. What is the root mean square speed of these molecules?
(a) √39×10⁶ m/s
(b) 6×10⁶ m/s
(c) √41×10⁶m/s
(d) 8×10⁶ m/s

Question 14:

Question 15:

Question 16:

Question 17:
The degrees of freedom of a molecule of a triatomic gas are
(a) 2
(b) 4
(c) 6
(d) 8

Question 18:
The temperature of argon, kept in a vessel, is raised by 1°C at a constant volume. The total heat supplied to the gas is a combination of translational and rotational energies. Their respective shares are
(a) 60% and 40%
(b) 40% and 60%
(c) 50% and 50%
(d) 100% and 0%

Question 19:
One mole of ideal monoatomic gas (γ=5/3) is mixed with one mole of diatomic gas (γ =7/5). What is γ for the mixture? (γ denotes the ratio of specific heat at constant pressure, to that at constant volume)
(a) 3/2
(b) 23/15
(c) 35/23
(d) 4/3

Question 20:

Question 21:
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 at constant volume is
(a) 7/5
(b) 8/7
(c) 5/7
(d) 9/7

Question 22:

Question 23:

Question 24:
Relationship between p, V and E for a gas is (E = total translational kinetic energy) .
(a) p = 3/2 EV
(b) V =2/3 Ep
(c) pV = 3E/2
(d) pV = 2E/3

Question 25:

Direction (Q. Nos. 26-29): In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
(c) If Assertion is true but Reason is false
(d) If both Assertion and Reason are false

Question 26:
Assertion (A): The number of degrees of freedom of triatomic molecules is 6.
Reason (R): Triatomic molecules have three translational degrees of freedom and three rotational degrees of freedom.

Question 27:
Assertion (A): The root mean square and most probable speeds of the molecules in a gas are the same.
Reason (R): The Maxwell distribution for the speed of molecules in a gas is symmetrical.

Question 28:
Assertion (A): If a gas chamber containing a gas is moved translationally, then temperature of gas will increase.
Reason (R): Total kinetic energy of the gas molecules will increase by the translational motion of gas chamber

Question 29:
Assertion (A): Total internal energy of oxygen gas at a given temperature is E of this energy 3/5 E is translational kinetic energy and 2/5 E is rotational kinetic energy.
Reason (R): Potential energy of an ideal gas is zero.

Question 30:
The mean free path of molecules of a gas, (radius r) is inversely proportional to
(a) r³
(b) r²
(c) r
(d) √r

Question 31:

Question 32:

Question 33:

Question 34:

Question 35:
A balloon is filled at 27°C and 1 atm pressure by 500 m³ He. At – 3°C and 0.5 atm pressure, the volume of He gas will be
(a) 700 m³
(b) 900 m³
(c) 1000 m³
(d) 500 m³

Question 36:
Root mean square speed of the molecules of ideal gas is v. If pressure is increased two times at constant temperature, then the rms speed will become
(a) v/2
(b) v
(c) 2v
(d) 4v

Question 37:
The heat required to increase the temperature of 4 moles of a monoatomic ideal gas from 273 K to 473 K at constant volume is
(a) 200R
(b) 400R
(c) 800R
(d) 1200R

Question 38:
Assertion (A): The molecules of a monoatomic gas has three degrees of freedom.
Reason (R): The molecules of a diatomic gas has five degrees of freedom.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
(c) If Assertion is true but Reason is false
(d) If both Assertion and Reason are false

Question 39:

Question 40:
When an ideal monoatomic gas is heated at constant pressure, fraction of heat energy supplied which
increases the internal energy of gas, is
(a) 2/5
(b) 3/5
(c) 3/7
(d) 3/4

Answers:

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