Question # 1

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 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

Moment of inertia depends upon:

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Mass

Selection of axis of rotation

Both of them

None of these

Centripetal acceleration is also called ________ acceleration

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Tangential

Radial

Angular

None of these

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

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

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 fro them are

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3

24

126

200

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

Centripetal acceleration is also called ______ acceleration:

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Tangential

Radial

Angular

None of them

A car is moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed v of the car is:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

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

______ 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

A body can have constant velocity when it follows:

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A circular path

A rectilinear path

Trajectory of a projectile

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

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

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

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Degree

Revolution

Radian

Metre

One radian is:

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Greater than one degree

Less than one degree

Equal to degree

none of these

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ECAT Physics Chapter 5 Circular Motion Online Test MCQs With Answers

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