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NEET UG PHYSICS Multiple Choice Questions (MCQs)

NEET UG Physics - Kinetic Theory of Gases MCQs

121. What does the equation of state of a perfect gas relate to?

A) The density and pressure of the gas

B) The pressure, volume, and temperature of the gas

C) The volume and temperature of the gas

D) The energy and temperature of the gas

Answer: B) The pressure, volume, and temperature of the gas

122. The work done on compressing a gas is represented by which of the following?

A) W = P × V

B) W = (1/2) m v²

C) W = ∫ P dV

D) W = (3/2) k_B T

Answer: C) W = ∫ P dV

123. Which of the following is an assumption made in the Kinetic Theory of Gases?

A) Gas molecules are always at rest

B) The volume of gas molecules is negligible compared to the volume of the container

C) All gas molecules have the same velocity

D) Gas molecules interact with each other in a perfect manner

Answer: B) The volume of gas molecules is negligible compared to the volume of the container

124. The kinetic interpretation of temperature of a gas is related to:

A) The average force of gas molecules

B) The average speed of gas molecules

C) The average kinetic energy of gas molecules

D) The average pressure exerted by gas molecules

Answer: C) The average kinetic energy of gas molecules

125. What is the root mean square (RMS) speed of gas molecules related to?

A) The average distance traveled by a molecule

B) The total kinetic energy of the system

C) The average velocity of all molecules

D) The temperature of the gas

Answer: D) The temperature of the gas

126. The number of degrees of freedom for a monatomic ideal gas is:

A) 1

B) 2

C) 3

D) 5

Answer: C) 3

127. According to the Law of Equipartition of Energy, the energy is equally distributed among all degrees of freedom. For a monatomic gas, the total energy is:

A) (3/2) k_B T

B) (5/2) k_B T

C) 3 k_B T

D) k_B T

Answer: A) (3/2) k_B T

128. The specific heat capacity of an ideal gas at constant volume (Cv) is:

A) (5/2) R

B) (3/2) R

C) 2 R

D) R

Answer: B) (3/2) R

129. For an ideal gas, the mean free path is defined as:

A) The distance between two molecules

B) The average time a molecule takes to collide with another

C) The average distance a molecule travels before colliding with another molecule

D) The average velocity of gas molecules

Answer: C) The average distance a molecule travels before colliding with another molecule

130. The number of molecules per unit volume in a gas is given by:

A) n/V

B) P/(k_B T)

C) T/P

D) V/P

Answer: B) P/(k_B T)

131. The value of Avogadro's number is approximately:

A) 6.022 × 10²² molecules per mole

B) 1.67 × 10⁻²⁴ molecules

C) 3.14 × 10³ molecules

D) 2.69 × 10²³ molecules per mole

Answer: A) 6.022 × 10²² molecules per mole

132. The temperature of a gas is directly proportional to:

A) The velocity of gas molecules

B) The volume of the gas

C) The kinetic energy of gas molecules

D) The pressure of the gas

Answer: C) The kinetic energy of gas molecules

133. In the Kinetic Theory of Gases, which of the following is true for an ideal gas?

A) Gas molecules experience strong intermolecular forces

B) Gas molecules have a definite volume

C) Gas molecules move in random directions

D) Gas molecules lose energy in elastic collisions

Answer: C) Gas molecules move in random directions

134. The pressure exerted by a gas on the walls of its container is due to:

A) The gravitational force acting on the gas molecules

B) The continuous random motion of gas molecules

C) The volume of the gas molecules

D) The temperature of the gas molecules

Answer: B) The continuous random motion of gas molecules

135. In an ideal gas, the internal energy depends only on which of the following?

A) Pressure

B) Volume

C) Temperature

D) Number of gas molecules

Answer: C) Temperature

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