Question # 1

Centripetal acceleration is also called _______ acceleration:

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Tangential

Radial

Angular

None of them

One radian is:

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Greater than one degree

Less than one degree

Equal to degree

none of these

A rotating body tends to be slower, when its angular acceleration is:

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Positive

Negative

Zero

Infinity

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 0.8 m sec^-2comes out to:

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980 N

580 N

1380 N

Zero

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

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

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

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3

24

126

200

When a 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 car is turning around a corner at 10 m/sec as it travels along an arc of 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

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

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

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5 rad/sec²

-10 rav/sec²

-10 rad/sec²

-5 rav/sec²

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

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

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KHz

MHz

GHz

BHz

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

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

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Physics ECAT Pre Engineering Chapter 5 Circular Motion Online Test MCQs With Answers

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