Rotational Motion (NEET Physics): Questions 94 - 98 of 125

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Question number: 94

» Rotational Motion » Rotational Kinetic Energy

MCQ▾

Question

Two disc, each having moment of inertia 5 kg m 2 about its central axis, rotating with speeds 10 rad s -1 and 20 rad s -1, are brought in contact face with their axes of the rotation coincided. The loss of kinetic energy in the process is,

Choices

Choice (4) Response

a.

125 J

b.

5 J

c.

0 J

d.

2 J

Question number: 95

» Rotational Motion » Torque

MCQ▾

Question

A flywheel of mass 25 kg has a radius of 0.3 m. What force should be applied tangentially to the rim of the flywheel so that it acquires an angular acceleration of 4 rad s -2?

Choices

Choice (4) Response

a.

6.8 N

b.

11.2 N

c.

7.5 N

d.

2.6 N

Question number: 96

» Rotational Motion » Moment of Inertia

Assertion-Reason▾

Assertion (Ꭺ)

If two different axes are at same distance from the centre of mass of a rigid body, then moment of inertia of the given rigid body about both the axes will always be the same.

Reason (Ꭱ)

From parallel axis theorem, Equation where all terms have usual meaning.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 97

» Rotational Motion » Torque

MCQ▾

Question

The torque required to stop a wheel of moment of inertia Equation from a speed of 40 rad s -1 in 10 s is,

Choices

Choice (4) Response

a.

8 ⨯ 10 -3 Nm

b.

8 Nm

c.

0.8 Nm

d.

0.08 Nm

Question number: 98

» Rotational Motion » Concepts of Rotational Motion

MCQ▾

Question

A solid sphere is rolling on a frictionless surface shown in figure with a transnational velocity v m/s. If sphere climbs up to height h then value of v should be

Rolling sphere which is supposed to climb on height h

Rolling Sphere Which Is Supposed to Climb on Height H

Solid sphere is rolling on a frictionless surface shown in figure with a transnational velocity v m/s

Choices

Choice (4) Response

a.

Equation

b.

2gh

c.

Equation

d.

Equation

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