# Rotational Motion-Moment of Inertia (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 4 - 8 of 34

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## Question number: 4

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

Two discs of same thickness but of different radii are made of two different materials such that their masses are same. The densities of the materials are in the ratio 1: 3. The ratio of the moments of inertia of these discs about the respective axes passing through their centers and perpendicular to their planes will be in,

### Choices

Choice (4) Response

a.

9: 1

b.

3: 1

c.

1: 9

d.

1: 3

## Question number: 5

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

Two discs of the same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio of,

### Choices

Choice (4) Response

a.

1: 3

b.

1: 9

c.

1: 81

d.

1: 27

## Question number: 6

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

A circular disc of radius R and thickness has moment of inertia I about an axis passing through its center and perpendicular to its plane. It is melted and recanted into a solid sphere. The moment of inertia of the sphere about one of its diameters as an axis of rotation will be

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 7

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

Three rods each of length L and mass M are placed along X, Y and Z axis in such a way that one end of each of the rod is at the origin. The moment of inertia of this system about Z axis is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 8

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

From a uniform wire, two circular loops are made (i) P of radius r and (ii) Q of radius nr. If the moment of inertia of loop Q about an axis passing through its center and perpendicular to its plane is 27 times that of P about a similar axis, the value of n is (diameter of the wire is very much smaller than r or nr)

### Choices

Choice (4) Response

a.

4

b.

6

c.

2

d.

3

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