NEET Physics Torque Couple and Angular Momentum MCQs Set A

a) Transverse component

b) Either radial or transverse

c) Radial component

d) None of these

Answer: Transverse component

Question: A couple produces

a) rotational motion

b) linear motion

c) Both

d) None of these

Answer: rotational motion

Question: Which of the following statements about angular momentum is correct?

a) It is directly proportional to moment of inertia

b) It is a scalar quantity

c) both

d) None of these

Answer: It is directly proportional to moment of inertia

Question: The wide handle of screw is based upon

a) turning moment of force

b) None of these

c) law of conservation of linear momentum

d) Newton’s second law of motion

Answer: turning moment of force

Question:  Which of the following is an expression for angular momentum?

a)

b)

c)

d)

Answer:

Question:  Torque on a rotating body decreases, then its angular velocity

a) decreases

b) increases

c) remains constant

d) becomes zero

Answer: decreases

Question: When a mass is rotating in a plane about a fixed point, its angular momentum is directed along the

a) line perpendicular to plane of rotation

b) line parallel to plane of rotation

c) tangent to the orbit

d) radius of orbit

Answer: line perpendicular to plane of rotation

Question: Assertion : It is harder to open and shut the door if we apply force near the hinge.
Reason : Torque is maximum at hinge of the door.

a) Assertion is correct, reason is incorrect

b) Assertion is incorrect, reason is correct

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

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

Answer: Assertion is correct, reason is incorrect

Question:  A particle moving in a circular path has an angular momentum of L. If the frequency of rotation is halved, then its angular momentum becomes

a)

b)

c)

d) L

Answer:

Question:  Consider the following statements and select the correct option.
I. Moment of a couple depends on the point about which moment is taken.
II. Principle of moments holds only when parallel forces F₁ and F₂ are perpendicular to the lever
III. Centre of mass depends on the gravity
IV. Centre of mass depends on the distribution of mass of the body

a) IV only

b) I, II and III

c) III and IV

d) I and II

Answer:  IV only

Question: Assertion: An ice-skater stretches out arms-legs during performance.
Reason: Stretching out arms-legs helps the performer to balance his or her body so that he or she does not fall.

a) Assertion is correct, reason is incorrect

b) Assertion is incorrect, reason is correct

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

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

Answer:  Assertion is correct, reason is incorrect

Question:

a) t = 1s

b) t = 0.5 s

c) t = 0.25 s

d) t = 2s

Answer: t = 1s

Question: A disc is given a linear velocity on a rough horizontal surface then its angular momentum is

a) conserved about the point of contact only

b) conserved about all the points

c) not conserved about any point.

d) conserved about COM only

Answer: conserved about the point of contact only

Question:

a) –1

b) 1

c) zero

d) 2

Answer: –1

Question:  A particle of mass 2 kg is on a smooth horizontal table and moves in a circular path of radius 0.6 m. The height of the table from the ground is 0.8 m. If the angular speed of the particle is 12 rad s^–1, the magnitude of its angular momentum about a point on the ground right under the centre of the circle is

a) 14.4 kg m²s^–1

b) 20.16 kg m²s^–1

c) 8.64 kg m²s^–1

d) None  of these

Answer: 14.4 kg m²s^–1

Question:  If the angular momentum of a particle of mass m rotating along a circular path of radius r with uniform speed is L, the centripetal force acting on the particle is

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d) None of these

Answer:

Question:

a) zero

b)

c)

d)

Answer:  zero

Question:  The wide handle of screw is based upon

a) None of these

b) law of conservation of linear momentum

c) Newton’s second law of motion

d) Both

Answer: None of these

Question: When a mass is rotating in a plane about a fixed point, its angular momentum is directed along the

a) None of these

b) line parallel to plane of rotation

c) tangent to the orbit

d) radius of orbit

Answer:  None of these