# Rotational Motion (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 64 - 67 of 125

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## Question number: 64

» Rotational Motion » Radius of Gyration

MCQ▾

### Question

The radius of gyration of a disc of mass 80 g and radius 3 cm, about an axis passing through its center of gravity and perpendicular to the plane is

### Choices

Choice (4) Response

a.

6.54 cm

b.

1.76 cm

c.

2.12 cm

d.

3.54 cm

## Question number: 65

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

From a uniform wire, two circular loops are made loop-P of radius r and loop-Q of radius nr. Materials of both the loops are same. If the moment of inertia of loop Q about an axis passing through its center and perpendicular to its plane is 8 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.

6

b.

4

c.

8

d.

2

## Question number: 66

» Rotational Motion » Moment of Inertia

Assertion-Reason▾

### Assertion (Ꭺ)

Moment of inertia of a particle is same, whatever be the axis of rotation.

### Reason (Ꭱ)

Moment of inertia depends on mass and perpendicular distance of the particle from its axis of rotation.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

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

d.

Ꭺ is false but Ꭱ is true

## Question number: 67

» Rotational Motion » Moment of Inertia

MCQ▾

### Question

ABC is a triangular plate of uniform thickness. The sides are in the ratio shown in the figure. I AB, I BC, I CA are the moments of inertia of the plate about AB, BC, CA respectively. For this arrangement which one of the following relation is correct?

### Choices

Choice (4) Response

a.

I CA is maximum

b.

c.

d.