ECAT Pre General Science Physics Chapter 5 MCQ Test With Answer

Question # 1

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:

22/7 A
7 B
14 C
21 D

Question # 2

Centripetal force performs:

Maximum work A
Negative work B
Positive work C
None of these D

Question # 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:

5 rad/sec² A
-10 rev/sec² B
-10 rad/sec² C
-5 rev/sec² D

Question # 4

Conventionally the angular velocity is directed to an angle of:

90° to the axis of rotation A
30° to the axis of rotation B
0° to the axis of rotation C
None of the above D

Question # 5

Direction of motion ______ in circular motion:

Changes off and on A
Changes continuously B
Does not change C
None of them D

Question # 6

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

Greater than A
smaller than B
Equal to C
None of these D

Question # 7

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is:

0.05 m A
0.08 m B
0.8 m C
0.008 m D

Question # 8

Which of the following pairs does not have identical dimensions?

Torque and energy A
Energy and work B
Momentum and impulse C
Mass and moment of inertia D

Question # 9

When body moves along a circular path with constant speed, it has an acceleration, which is always directed;

Along the tangent A
Towards the centre B
Away from the centre C
None of them D

Question # 10

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:

1 m A
5 m B
10 m C
15 m D

Question # 11

When angular acceleration is positive, the body rotates:

Slower A
Slowest B
Faster C
None of these D

Question # 12

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

980 N A
580 N B
1380 N C
Zero D

Question # 13

A body can have constant velocity when it follows:

A circular path A
A rectilinear path B
Trajectory of a projectile C
None of these D

Question # 14

One radian is equal to:

30.3° A
45.3° B
50.3° C
57.3° D

Question # 15

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

Length equal to its diameter A
Length equal to its radius B
Any length C
None of these D

Question # 16

Conventionally the angular velocity is directed at an angle of

90° to the axis of rotation A
30° to the axis of rotation B
0° to the axis of rotation C
None of the above D

Question # 17

Angular momentum is a:

vector quantity A
Imaginary quantity B
Complex Quantity C
Scalar Quantity D

Question # 18

Satellites are held in orbits around Earth by its:

Gravitational field A
Magnetic field B
Own orbital motion C
Own spin motion D

Question # 19

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

3 A
24 B
126 C
200 D

Question # 20

Direction of motion _______ in circular motion

Changes off and on A
Changes continuously B
Does not change C
None of them D

Question # 21

Circular motion is an example of motion in:

One dimension A
Two dimensions B
Three dimensions C
None of these D

Question # 22

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is

0.05 m A
0.08 cm B
0.8 m C
0.008 m D

Question # 23

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:

22/7 A
7 B
14 C
21 D

Question # 24

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

49 rad/sec² A
1 rad/sec² B
0.16 rev/sec² C
Both A and C D
Both B and C E

Question # 25

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

Zero A
Its average velocity B
Its angular displacement C
None of these D

Question # 26

Moment of linear momentum is called.

Moment arm A
Moment of inertia B
Inertia C
Angular momentum D

Question # 27

Direction of motion_______ in circular of motion:

Changes off and on A
Changes continuously B
Does not change C
None of them D

Question # 28

The center of mass of a sphere lies at:

The axis of the sphere A
Circumference of sphere B
Center of the sphere C
None of them D

Question # 29

An axis of rotation

Is a straight line A
Is normal to the plane of rotation B
Passes through pivot point O C
All of them D

Question # 30

Direction of motion _________ in circular motion

Changes off and on A
Changes continously B
Does not change C
None of them D

Sr.#	Question	Answer
1	Which one is related to angular motion:	A. Moment of a force B. Moment of inertia C. Moment of momentum D. None of these
2	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:	A. Radius of the circle B. Twice the radius C. Thrice the radius D. None of these
3	The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 0.8 m sec^-2comes out to:	A. 980 N B. 580 N C. 1380 N D. Zero
4	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:	A. 22/7 B. 7 C. 14 D. 21
5	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:	A. 0.05 m B. 0.08 m C. 0.8 m D. 0.008 m
6	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:	A. 1 m B. 5 m C. 10 m D. 15 m
7	Satellites are held in orbits around Earth by its:	A. Gravitational field B. Magnetic field C. Own orbital motion D. Own spin motion
8	Which of the following pairs does not have identical dimensions?	A. Torque and energy B. Energy and work C. Momentum and impulse D. Mass and moment of inertia
9	A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is:	A. 38 m/sec B. 3.8 m/sec C. 0.6 m/sec D. None of these
10	Centripetal force performs:	A. Maximum work B. Negative work C. Positive work D. None of these

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ECAT Pre General Science Physics Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 5 Circular Motion

ECAT Pre General Science Physics Chapter 5 Circular Motion

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:

Centripetal force performs:

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:

Conventionally the angular velocity is directed to an angle of:

Direction of motion ______ in circular motion:

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

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is:

Which of the following pairs does not have identical dimensions?

When body moves along a circular path with constant speed, it has an acceleration, which is always directed;

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:

When angular acceleration is positive, the body rotates:

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

A body can have constant velocity when it follows:

One radian is equal to:

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

Conventionally the angular velocity is directed at an angle of

Angular momentum is a:

Satellites are held in orbits around Earth by its:

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

Direction of motion _______ in circular motion

Circular motion is an example of motion in:

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is

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:

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

Moment of linear momentum is called.

Direction of motion_______ in circular of motion:

The center of mass of a sphere lies at:

An axis of rotation

Direction of motion _________ in circular motion

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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:

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:

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

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: