# Rotational Motion (AIIMS (All India Institute of Medical Sciences) Physics): Questions 9 - 12 of 16

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## Question number: 9

» Rotational Motion » Torque

MCQ▾

### Question

A force newton acts on a particle whose position vector with respect to origin O is Find the magnitude and direction of the torque.

### Choices

Choice (4) Response

a.

Magnitude 21 Nm, direction along the negative z – axis

b.

Magnitude 31 Nm, direction along the positive z – axis

c.

Magnitude 21 Nm, direction along the positive z – axis

d.

Magnitude 31 Nm, direction along the negative z – axis

## Question number: 10

» Rotational Motion » Concepts of Rotational Motion

MCQ▾

### Question

A stone of mass 5 kg is attached to a string long and is whirled in a horizontal circle. The maximum tension the string can withstand is 20 N. What maximum velocity can be given to the stone without breaking the string?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 11

» Rotational Motion » Radius of Gyration

MCQ▾

### Question

The angular velocity of a body changes from to without applying torque but by changing moment of inertia. The ratio of initial radius of gyration to the final radius of gyration is –

### Choices

Choice (4) Response

a.

b.

c.

d.

2

## Question number: 12

» Rotational Motion » Rigid Body Rotation Equations of Rotational Motion

MCQ▾

### Question

A rope is wound around a hollow cylinder of and radius. If the rope is pulled with a force , the angular acceleration of cylinder and the linear acceleration of the rope are respectively –

### Choices

Choice (4) Response

a.

b.

c.

d.

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