# 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, 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 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

### Choices

Choice (4) Response

a.

b.

2gh

c.

d.

f Page