Rotational Motion (NEET Physics): Questions 27 - 31 of 123

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Question number: 27

» Rotational Motion » Angular Momentum

MCQ▾

Question

If the earth is treated as a sphere of radius R and mass M. Its angular momentum about the axis of rotation with period T is

Choices

Choice (4) Response

a.

πMR25T

b.

4πMR25T

c.

πMR2T

d.

πMR3T

Question number: 28

» Rotational Motion » Angular Momentum

MCQ▾

Question

A uniform heavy disc is rotating at constant angular velocity about a vertical axis through its center and perpendicular to the plane of the disc. Let L be its angular momentum. A lump of plasticize is dropped vertically on the disc and sticks to it. Which of the following will be constant?

Choices

Choice (4) Response

a.

a and L

b.

a

c.

L Only

d.

All of the above

Question number: 29

» Rotational Motion » Torque

MCQ▾

Question

A constant torque of 1000 N -m, turns a wheel of moment of inertia 200 kg -m 2 about an axis passing through the center. Angular velocity of the wheel after 3 s will be

Choices

Choice (4) Response

a.

1 rad/s

b.

15 rad/s

c.

10 rad/s

d.

5 rad/s

Question number: 30

» Rotational Motion » Angular Momentum

MCQ▾

Question

The angular momentum of a system of particles is conserved

Choices

Choice (4) Response

a.

When no external force acts upon the system

b.

When axis of rotation remains same

c.

When no external torque acts upon the system

d.

When no external impulse acts upon the system

Question number: 31

» Rotational Motion » Torque

MCQ▾

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from Aq to 5Aq in 4 seconds. The magnitude of this torque is

Choices

Choice (4) Response

a.

4A0

b.

A0

c.

12A0

d.

3A04

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