Rotational Motion-Moment of Inertia (NEET Physics): Questions 19 - 22 of 34

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Question number: 19

» Rotational Motion » Moment of Inertia

MCQ▾

Question

A disc is of mass M and radius R. The moment of inertia of it about an axis tangential to its edge and in polarize of the disc or parallel to its diameter is

Choices

Choice (4) Response
a.

32Mr2

b.

14Mr2

c.

54Mr2

d.

12Mr2

Question number: 20

» Rotational Motion » Moment of Inertia

MCQ▾

Question

Two rings of the same radius and mass are placed such that their centers are at a common point and their planes are perpendicular to each other. The moment of inertia of the system about an axis passing through the center and perpendicular to the plane of one of the rings is (mass of the ring = m and radius = r)

Choices

Choice (4) Response
a.

32mr2

b.

2 mr2

c.

mr2

d.

12mr2

Question number: 21

» Rotational Motion » Moment of Inertia

MCQ▾

Question

Two discs of same thickness but of different radii are made of two different materials such that their masses are same. The materials are of densities ρ 1 and ρ 2. The ratio of the moments of inertia of these discs about the respective axes passing through their centers and perpendicular to their planes will be in,

Choices

Choice (4) Response
a.

ρ1:ρ2

b.

ρ12:ρ22

c.

ρ22ρ12:1

d.

ρ2:ρ1

Question number: 22

» 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)

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