Rotational Motion (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 41 - 45 of 125

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Question number: 41

» Rotational Motion » Angular Momentum

Assertion-Reason▾

Question

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

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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

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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

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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

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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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