# Rotational Motion (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 71 - 75 of 125

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## Question number: 71

» Rotational Motion » Moment of Inertia

Assertion-Reason▾

### Assertion (Ꭺ)

If earth shrink (without change in mass) to half of its present size, length of the day would become 6 % increase.

### Reason (Ꭱ)

When the size of the earth will change, its moment of inertia will also change.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

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

## Question number: 72

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

Two discs of the same material and thickness have radii 0.4 m and 0.8 m. Their moments of inertia about their axes will be in the ratio of

### Choices

Choice (4) Response

a.

1: 81

b.

1: 27

c.

1: 16

d.

1: 3

## Question number: 73

» Rotational Motion » Values of Moments of Inertia

MCQ▾

### Question

Moment of inertia of a ring of mass M = 5 gm and radius R = 2 cm about an axis passing through its edge and parallel to its natural axis is

### Choices

Choice (4) Response

a.

30 gm-cm 2

b.

40 gm-cm 2

c.

35 gm-cm 2

d.

45 gm-cm 2

## Question number: 74

» Rotational Motion » Values of Moments of Inertia

MCQ▾

### Question

A constant torque of 31.4 N-m is exerted on a pivoted wheel. If angular acceleration of wheel is 4π rad/sec 2, then the moment of inertia of the wheel is

### Choices

Choice (4) Response

a.

4.5 kg-m 2

b.

5.5 kg-m 2

c.

2.5 kg-m 2

d.

1.5 kg-m 2

## Question number: 75

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

A disc is of mass M and radius R. The moment of inertia of it about an axis tangential to its edge and in polarize of the disc or parallel to its diameter is

### Choices

Choice (4) Response

a.

b.

c.

d.