Rotational Motion (NEET Physics): Questions 84 - 88 of 123

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Question number: 84

» Rotational Motion » Conservation of Angular Momentum

MCQ▾

Question

A cord is wound round the circumference of wheel of radius r. The axis of the wheel is horizontal and moment of inertia about it is I. A weight mg is attached to the end of the cord and falls from the rest. After falling through a distance h the angular velocity of the wheel will be

Choices

Choice (4) Response
a.

[2mgh1+mr2]12

b.

2gh1+mr

c.

2gh

d.

[2mgh1+2mr2]12

Question number: 85

» Rotational Motion » Radius of Gyration

MCQ▾

Question

The radius of gyration of a disc of mass 200 g and radius 3.2 cm, about an axis passing through its center of gravity and perpendicular to the plane is

Choices

Choice (4) Response
a.

2.54 cm

b.

1.06 cm

c.

0.54 cm

d.

2.26 cm

Question number: 86

» Rotational Motion » Rigid Body Rotation Equations of Rotational Motion

MCQ▾

Question

A wheel has a speed of 1200 revolutions per minute and is made to slow down at a rate of 4 rad /s 2. The number of revolutions is makes before coming to rest is,

Choices

Choice (4) Response
a.

272

b.

314

c.

143

d.

722

Question number: 87

» Rotational Motion » Moment of Inertia

MCQ▾

Question

Moment of inertia of a disc about its own axis is I. its moment of inertia about a tangential axis in its plane is

Choices

Choice (4) Response
a.

32I

b.

2I

c.

52I

d.

3I

Question number: 88

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

A constant torque of 3.6 N-m is exerted on a pivoted wheel. If angular acceleration of wheel is rad/sec 2, then the moment of inertia of the wheel is

Choices

Choice (4) Response
a.

2.5 kg-m 2

b.

1.21 kg-m 2

c.

0.6 kg-m 2

d.

2.5 kg-m 3

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