Rotational Motion (NEET Physics): Questions 80 - 83 of 123

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Question number: 80

» Rotational Motion » Moment of Inertia

MCQ▾

Question

From a disc of radius R, a concentric circular portion of radius r is cut out so as to leave an annular disc of mass M. The moment of inertia of this annular disc about the axis perpendicular to its plane and passing through its center of gravity is,

Choices

Choice (4) Response
a.

12M(R4+r4)

b.

12M(R2r2)

c.

12M(R4r4)

d.

12M(R2+r2)

Question number: 81

» Rotational Motion » Moment of Inertia

MCQ▾

Question

One circular ring and one circular disc, both are having the same mass and radius. The ratio of their moments of inertia about the axes passing through their centers and perpendicular to their planes, will be

Choices

Choice (4) Response
a.

1: 1

b.

1: 2

c.

2: 1

d.

4: 1

Question number: 82

» Rotational Motion » Concepts of Rotational Motion

MCQ▾

Question

A solid sphere, disc and solid cylinder all of the same mass and made up of same material are allowed to roll down (from rest) on an inclined plane, then

Choices

Choice (4) Response
a.

Solid sphere reaches the bottom late

b.

Disc will reach the bottom first

c.

All of team reach the bottom at the same time

d.

Solid sphere reaches the bottom first

Question number: 83

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

A long rod has a mass of 5 kg and length 2 m. The moment of inertia about an axis passing through the center and perpendicular to the length of rod will be

Choices

Choice (4) Response
a.

0.01 kg-m 2

b.

1.66 kg-m 2

c.

0.008 kg-m 2

d.

0.001 kg-m 2

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