Question # 1

Conventional 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 above

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

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

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

One radian is:

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Greater than one degree

Less than one degree

Equal to degree

none of these

A stone tied to the end of a 20 cm long string is whirled in a horizontal circle. If centripetal acceleration is 9.8 m/sec², then its angular velocity is 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

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

A point on the rim of a wheel moves 0.2 m where the wheel turns through an angle is 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

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 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

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

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

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

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

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

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

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Positive

Negative

Zero

Infinity

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

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

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