NEET UG PHYSICS Multiple Choice Questions (MCQs)

Q61. The center of mass of a two-particle system lies:

• a) Closer to the heavier particle
• b) Closer to the lighter particle
• c) Exactly at the midpoint
• d) At an arbitrary point

Answer: a) Closer to the heavier particle

Q62. The moment of inertia of a body about an axis depends on:

• a) The mass of the body
• b) The velocity of the body
• c) The mass distribution and the axis of rotation
• d) The shape of the body

Answer: c) The mass distribution and the axis of rotation

Q63. The physical quantity that represents the rotational equivalent of linear momentum is:

• a) Torque
• b) Moment of inertia
• c) Angular momentum
• d) Kinetic energy

Answer: c) Angular momentum

Q64. Which of the following is the correct unit of torque?

• a) N·m
• b) N·s
• c) kg·m/s
• d) kg·m²/s

Answer: a) N·m

Q65. If a body is in equilibrium, the sum of all torques acting on it is:

• a) Equal to the mass of the body
• b) Zero
• c) Maximum
• d) Equal to the angular velocity

Answer: b) Zero

Q66. The moment of inertia of a solid sphere about its diameter is:

• a) (2/5)mr²
• b) (1/2)mr²
• c) (1/5)mr²
• d) (1/3)mr²

Answer: a) (2/5)mr²

Q67. The radius of gyration of a body is defined as:

• a) The distance from the axis of rotation
• b) The square root of the ratio of moment of inertia to the mass
• c) The distance from the center of mass to the axis of rotation
• d) The distance at which the force acts

Answer: b) The square root of the ratio of moment of inertia to the mass

Q68. Which of the following is an application of the parallel axis theorem?

• a) Finding the moment of inertia about any axis parallel to the center of mass
• b) Finding the angular velocity of a rotating body
• c) Calculating the kinetic energy of a rotating body
• d) None of the above

Answer: a) Finding the moment of inertia about any axis parallel to the center of mass

Q69. The conservation of angular momentum applies when:

• a) The object is moving in a straight line
• b) No external torque acts on the object
• c) The object is at rest
• d) The body is under the influence of gravity

Answer: b) No external torque acts on the object

Q70. Which of the following is the correct equation for angular momentum?

• a) L = Iω
• b) L = rF
• c) L = mv
• d) L = Iα

Answer: a) L = Iω

Q71. The moment of inertia of a thin rod of length L about its center is:

• a) (1/12)ML²
• b) (1/2)ML²
• c) (1/3)ML²
• d) (1/4)ML²

Answer: a) (1/12)ML²

Q72. For a rotating object, the equation of rotational motion is:

• a) F = ma
• b) τ = Iα
• c) v = ωr
• d) K = 1/2 mv²

Answer: b) τ = Iα

Q73. In which of the following conditions does the rotational motion of a body cease?

• a) When the body starts rotating
• b) When no external force is acting on the body
• c) When external torque acting on the body becomes zero
• d) When angular velocity becomes zero

Answer: c) When external torque acting on the body becomes zero

Q74. What is the rotational analogue of Newton's second law for translation, F = ma?

• a) τ = Iα
• b) τ = Fd
• c) ω = Iα
• d) F = Iα

Answer: a) τ = Iα

Q75. Which of the following is the correct comparison between linear and rotational motion?

• a) Linear displacement is analogous to angular velocity
• b) Linear velocity is analogous to angular displacement
• c) Linear momentum is analogous to angular momentum
• d) All of the above

Answer: c) Linear momentum is analogous to angular momentum