Rotational Motion (NEET Physics): Questions 41 - 45 of 123

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Question number: 41

» Rotational Motion » Angular Momentum

Assertion-Reason▾

Assertion (Ꭺ)

Torque is equal to rate of change of angular momentum.

Reason (Ꭱ)

Angular momentum depends on moment of inertia and angular velocity.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 42

» Rotational Motion » Angular Momentum

MCQ▾

Question

In a bicycle, the radius of rear wheel is twice the radius of front wheel. If r F and r r are the radius, v p and v r are speeds of top most points of wheel, then

Choices

Choice (4) Response

a.

v r = 2v F

b.

v F = v r

c.

v F = 2v r

d.

v F > v r

Question number: 43

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

A flywheel rotating about a fixed axis has a kinetic energy of 380 J, when its angular speed is 35 rad s -1. The moment of inertia of the wheel about the axis of rotation is,

Choices

Choice (4) Response

a.

0.8 kg m 2

b.

0.75 kg m 2

c.

0.15 kg m 2

d.

0.62 kg m 2

Question number: 44

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

A cylinder of 500 g and radius 10 cm has moment of inertia (about its natural axis)

Choices

Choice (4) Response

a.

2.5 ⨯ 10 -3 kg-m 2

b.

2 ⨯ 10 -3 kg-m 2

c.

3.5 ⨯ 10 -3 kg-m 2

d.

5 ⨯ 10 -3 kg-m 2

Question number: 45

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

Three particles of mass 1.5 kg are attached to the rim of a circular disc of radius 0.2 m & negligible mass. Moment of inertia of die system about an axis passing through the center of the disc & perpendicular to its plane is

Choices

Choice (4) Response

a.

2.2 kg-m 2

b.

0.18 kg-m 2

c.

l kg-m 2

d.

0.24 kg-m 2

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