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

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

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

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

Angular momentum is a:

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vector quantity

Imaginary quantity

Complex Quantity

Scalar Quantity

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 one degree

None of them

One radian is:

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Greater than one degree

Less than one degree

Equal to one degree

None of these

Circular motion is an example of motion in:

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One dimension

Two dimensions

Three dimensions

None of these

Centripetal acceleration is also called ______ acceleration:

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Tangential

Radial

Angular

None of them

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

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

Centripetal acceleration is also called ________ acceleration

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Tangential

Radial

Angular

None of these

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 a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

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

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Degree

Revolution

Radian

Metre

Final velocity of a hoop is __________ the final velocity of a disc having same mass and radius on coming down an inclined plane.

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Greater than

smaller than

Equal to

None of these

Moment of inertia depends upon:

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Mass

Selection of axis of rotation

Both of them

None of these

A disc rolls down a hill and its speed at bottom is found to be 11.4 m/sec. Height of the hill is then nearly:

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10 m

12 m

13 m

15 m

The angular speed of a particle moving along a circular path is 5 Pie rad sec^-1, Its period of motion is:

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2.5 sec

0.06 sec

15.7 sec

0.4 sec

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

One radian is:

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Greater than one degree

Less than one degree

Equal to degree

none of these

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

Satellites are held in orbits around Earth by its:

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Gravitational field

Magnetic field

Own orbital motion

Own spin motion

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 continuously

Does not change

None of them

Centripetal force performs:

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Maximum work

Negative work

Positive work

None of these

One radian is

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Greater than one degree

Less than one degree

Equal to one degree

None of these

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 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

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

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