Rotational Motion (NEET Physics): Questions 76 - 79 of 123

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Question number: 76

» Rotational Motion » Radius of Gyration

MCQ▾

Question

The radius of gyration of a disc of mass 50 g and radius 2.5 cm, about an axis passing through its center of gravity and perpendicular to the plane is

Choices

Choice (4) Response

a.

1.76 cm

b.

6.54 cm

c.

0.52 cm

d.

3.54 cm

Question number: 77

» 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: 78

» Rotational Motion » Torque

MCQ▾

Question

A thin wire of length L and uniform linear mass density ρ is bent into a circular loop with center at O as shown in figure. The moment of inertia of the loop about the axis XX’ is

Circular loop of wire of length L

Circular Loop of Wire of Length L

Thin wire of length L and uniform linear mass density p is bent into a circular loop with center at O

Choices

Choice (4) Response

a.

3ρL38π2

b.

ρL316π2

c.

5ρL316π2

d.

ρL38π2

Question number: 79

» 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

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