NEET Physics Kinetic Theory of an Ideal Gas and Gas Laws MCQs Set A

a) Both Charle’s law and Boyle’s law

b) None of these

c) Boyle’s law

d) Charle’s law

Answer: Both Charle’s law and Boyle’s law

Question: When do real gases approach the ideal gas behaviour ?

a) At low pressure and high temperature

b) At low pressure and low temperature

c) At high pressure and high temperature

d) At  high pressure and low temperature

Answer: At low pressure and high temperature

Question: According to the kinetic theory of gases, the pressure exerted by a gas on the wall of the container is measured as

a) rate of change of momentum imparted to the walls per second per unit area

b) momentum imparted to the walls per unit area

c) change of momentum imparted to the walls per unit area

d) change in momentum per unit volume

Answer: rate of change of momentum imparted to the walls per second per unit area

Question: When a gas is in thermal equilibrium, its molecules

a) have the same average kinetic energy of molecules

b) have different energies which remain constant

c) have a certain constant energy

d) do not collide with one another

Answer: have the same average kinetic energy of molecules

Question:  The equation which should be satisfied exactly at all pressures and temperatures to be an ideal gas is

a)

b)

c)

d) All of these

Answer:

Question: Molecules of a ideal gas behave like

a) perfectly elastic rigid sphere

b) perfectly elastic non-rigid sphere

c) inelastic non-rigid sphere

d) None of these

Answer: perfectly elastic rigid sphere

Question: In kinetic theory of gases, it is assumed that molecules

a) have same mass but negligible volume

b) have different mass as well as volume

c) have same volume but mass can be different

d) have same mass but can have different volume

Answer:  have same mass but negligible volume

Question: The internal energy of a gram-molecule of an ideal gas depends on

a) pressure alone

b) volume alone

c) temperature alone

d) both on pressure as well as temperature

Answer: pressure alone

Question: The phenomenon of Browninan movement may be taken as evidence of

a) kinetic theory of matter

b) electromagnetic theory of radiation

c) corpuscular theory of light

d) photoelectric phenomenon

Answer: kinetic theory of matter

Question: According to kinetic theory of gases, at absolute zero temperature

a) molecular motion stops

b) liquid hydrogen freezes

c) water freezes

d) liquid helium freezes

Answer: molecular motion stops

Question:  At a given temperature the force between molecules of a gas as a function of intermolecular distance is

a) first decreases and then increases

b) always increases

c) always decreases

d) always constant

Answer: first decreases and then increases

Question: For Boyle’s law to hold, the gas should be

a) perfect and of constant mass and temperature

b) real and of constant mass and temperature

c) perfect and constant temperature but variable mass

d) real and constant temperature but variable mass

Answer: perfect and of constant mass and temperature

More Questions..........................................................

Question: Boyle' law is applicable for an

a) isothermal process

b) isochoric process

c) adiabatic process

d)isobaric process

Answer: isothermal process

Question: The deviation of gases from the behaviour of ideal gas is  due to

a) attraction of molecules

b) absolute scale of temp.

c)  covalent bonding of molecules

d) colourless molecules

Answer: attraction of molecules

Question:  The give  n P-V curve is predicted by

a) Boyle’s law

b) Charle’s law

c) Avogadro’s law

d) Gaylussac’s law

Answer:  Boyle’s law

Question:  What will be the ratio of number of molecules of a monoatomic and a diatomic gas in a vessel, if the ratio of their partial pressures is 5 : 3 ?

a) 5 : 3

b) 3 : 5

c) 3 : 1

d) 5 : 1

Answer: 5 : 3

Question:Assertion: On reducing the volume of the gas at constant temperature, the pressure of the gas increases.
Reason: It happens because on reducing the volume, the no. of molecules per unit volume increases and as a result more collisions with walls exert greater pressure on the walls.

a) Assertion is correct, reason is correct; reason is a correct explanation for assertion

b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

c) Assertion is correct, reason is incorrect

d) Assertion is incorrect, reason is correct.

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:  If the pressure and the volume of certain quantity of ideal gas are halved, then its temperature

a) becomes one-fourth

b) is halved

c) remains constant

d) is doubled

Answer:  becomes one-fourth

Question: If a gas is heated at constant pressure, its isothermal compressibility

a) remains constant

b) increases linearly with temperature

c) decreases linearly with temperature

d) decreases inversely with temperature

Answer: remains constant

Question: Assertion : A gas can be liquified at any temperature by increase of pressure alone.
Reason : On increasing pressure the temperature of gas decreases

a) Assertion is incorrect, reason is correct

b) Assertion is correct, reason is incorrect

c) Assertion is correct, reason is correct; reason is nota correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Answer:  Assertion is incorrect, reason is correct

Question:  A gas in a container A is in thermal equilibrium with antoher gas of the same mass in container B. If we denote the corresponding pressures and volumes by the suffixes A and B, then which of the following statement is most likely to be true?

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:   If the critical temperature of a gas is 100ºC, its Boyletemperature will be approximately

a) 337.5ºC

b) 500ºC

c) 33.3ºC

d) 1000ºC

Answer: 337.5ºC

Question:  A vessel has 6g of hydrogen at pressure P and temperature 500K. A small hole is made in it so that hydrogen leaks out. How much hydrogen leaks out if the final pressure is P/2 and temperature falls to 300 K ?

a) 1g

b) 4g

c)  3g

d) 2g

Answer: 1g

Question:  If the intermolecular forces vanish away, the volume occupied by the molecule contained in 4.5 kg water at standard temperature and pressure will be given by

a) 4.5 litre

b)5.6 litre

c) 11.2 litre

d) None of these

Answer: 4.5 litre

Question:  A balloon contains 1500 m³ of helium at 27^oC and 4 atmospheric pressure. The volume of helium at – 3^oC temperature and 2 atmospheric pressure will

a) 2700 m³

b) 1900 m³

c)  700 m³

d) 1500 m³

Answer: 2700 m³

Question: A perfect gas at 27°C is heated at constant pressure so as to double its volume. The final temperature of the gas will be, close to

a) 327°C

b) 200°C

c) 54°C

d)300°C

Answer: 327°C

Question: The number of molecules in each cubic metre of a gas at 1atm and 27^oC is

a) 2.4 × 10²⁵

b) 5.2 × 10²⁹

c) 6.1 × 10³⁰

d) 8.3 × 10³¹

Answer:  2.4 × 10²⁵

Question: Ratio of volume occupied by a gas H₂ of mass 22 gm at two different pressure p and 2p if temperature remains constant is

a) 2 : 1

b) 1 : 4

c) 4 : 1

d) 1 : 2

Answer: 2 : 1

Question: P, V, T respectively denote pressure, volume and temperature of two gases. On mixing, new temperature and volume are respectively T and V. Final pressure of the mixture is

a) 2P

b) zero

c) P

d) 3P

Answer:   2P