Question # 1

The instantaneous acceleration of a body moving with constant speed in a circle:

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Remains constant

Is called centripetal acceleration

Tangential acceleration

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

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

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

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

Einstein's theory about gravity if better than Newton's because it gave explanation of:

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Inverse square law

Bending of light

Both A and B

None of above

Radian is defined as the angle subtended at the center of a circle by an arc of:

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Length equal to its diameter

Length equal to its radius

Any length

None of these

Centripetal acceleration is also called ______ acceleration

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Tangential

Radial

Angular

None of them

The useful unit of the angular displacement in SI unit is:

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Degree

Revolution

Radian

Metre

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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1 m

5 m

10 m

15 m

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec^-2comes out to be

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980 N

580 N

1380 N

Zero

If a gymnast sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will

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Increase

Decrease

Remain constant

None of these

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

Satellites are held in orbits around Earth by its:

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Gravitational field

Magnetic field

Own orbital motion

Own spin motion

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

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

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ECAT Physics Chapter 5 Circular Motion Online Test MCQs With Answers

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