Question # 1

A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is:

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Radius of the circle

Twice the radius

Thrice the radius

None of these

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.

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Disc, sphere

sphere, hoop

Thin rod, hoop

Hoop,disc

Conventionally the angular velocity is directed to an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of the above

Centripetal acceleration is also called ________ acceleration

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Tangential

Radial

Angular

None of these

Direction of angular momentum is determined by:

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Right hand rule

Head to tail rule

Left hand rule

None of them

______ plays the same role during angular motion as played by the mass in linear motion

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Torque

Angular Momentum

Moment of a force

Moment of inertia

INTELSAT operates at frequencies 4, 6, 11, 14 having unit of

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KHz

MHz

GHz

BHz

Angular momentum is a:

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vector quantity

Imaginary quantity

Complex Quantity

Scalar Quantity

The center of mass of a sphere lies at:

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The axis of the sphere

Circumference of sphere

Center of the sphere

None of them

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

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49 rad/sec²

1 rad/sec²

0.16 rev/sec²

Both A and C

Both B and C

An axis of rotation

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Is a straight line

Is normal to the plane of rotation

Passes through pivot point O

All of them

Conventionally the angular velocity is directed at an angle of

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of the above

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

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Zero

Its average velocity

Its angular displacement

None of these

Direction of motion ______ in circular motion:

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Changes off and on

Changes continuously

Does not change

None of them

A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.

if centripetal acceleration is 9.8 m/sec², then its angular velocity in rad/sec is:

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22/7

7

14

21

Centripetal acceleration is also called _______ acceleration:

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Tangential

Radial

Angular

None of them

Direction of motion _______ in circular motion

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Changes off and on

Changes continuously

Does not change

None of them

When a body is moves along a circular path with constant speed, it has an acceleration, which is always directed:

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Along the tangent

Toward the centre

Away from the centre

None of them

A rotating wheel accelerates up to the value of 0.75 rev/sec²after 2 seconds of its start. Its angular velocity becomes:

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9.42 rad/sec

2.6 rev/sec

1.5 rev/sec

Both A and C

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

In case of planets, the necessary acceleration is provided by:

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Gravitational force

Coulomb force

Frictional force

None of these

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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3

24

126

200

When body moves along a circular path with constant speed, it has an acceleration, which is always directed;

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Along the tangent

Towards the centre

Away from the centre

None of them

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is:

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0.05 m

0.08 m

0.8 m

0.008 m

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

One radian is:

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Greater than one degree

Less than one degree

Equal to one degree

None of these

A 1000 Kg car travelling with a speed of 90 km/hr turns around a curve of radius 0.1 km. The necessary centripetal force comes out to be:

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8.1 X 10⁷N

625 N

6250 N

None of these

Direction of motion _________ in circular motion

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Changes off and on

Changes continously

Does not change

None of them

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

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