ECAT Pre General Science Physics Chapter 5 MCQ Test With Answer

Question # 1

A rotating wheel accelerates up to the value of 0.75 rev/sec²after 2 seconds of its start. Its angular velocity becomes:

9.42 rad/sec A
2.6 rev/sec B
1.5 rev/sec C
Both A and C D

Question # 2

If a gymnast sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will

Increase A
Decrease B
Remain constant C
None of these D

Question # 3

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 # 4

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 # 5

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 # 6

One radian is equal to:

30.3° A
45.3° B
50.3° C
57.3° D

Question # 7

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:

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

Question # 8

When angular acceleration is positive, the body rotates:

Slower A
Slowest B
Faster C
None of these D

Question # 9

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 # 10

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 # 11

Angular momentum is a:

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

Question # 12

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

3 A
24 B
126 C
200 D

Question # 13

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

No work is done on it A
No acceleration is produced in the body B
Velocity remains constant C
None of these D

Question # 14

Moment of linear momentum is called.

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

Question # 15

Centripetal acceleration is also called ________ acceleration

Tangential A
Radial B
Angular C
None of these D

Question # 16

A body moving along the circumference of a circle of radius R completes one revolution. The radius of a covered path to the angle subtended at the centre is:

Radius of the circle A
Twice the radius B
Thrice the radius C
None of these D

Question # 17

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 # 18

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 # 19

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:

8.1 X 10⁷N A
625 N B
6250 N C
None of these D

Question # 20

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

2.5 sec A
0.06 sec B
15.7 sec C
0.4 sec D

Question # 21

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

No work is done on it A
No acceleration is produced in the body B
Velocity remains constant C
None of these D

Question # 22

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

Increase A
Decrease B
Remains constant C
None of these D

Question # 23

Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.

Disc, sphere A
sphere, hoop B
Thin rod, hoop C
Hoop,disc D

Question # 24

One radian is equal to:

30.3° A
45.3° B
50.3° C
57.3° D

Question # 25

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 # 26

A car is turning around a corner at 10 m/sec as it travels along an arc of a 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 # 27

Which one is related to angular motion:

Moment of a force A
Moment of inertia B
Moment of momentum C
None of these D

Question # 28

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

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

Question # 29

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

KHz A
MHz B
GHz C
BHz D

Question # 30

Angular velocity is a:

Scalar quantity A
Vector quantity B
Complex quantity C
None of these D

Sr.#	Question	Answer
1	A rotating wheel accelerates up to the value of 0.75 rev/sec²after 2 seconds of its start. Its angular velocity becomes:	A. 9.42 rad/sec B. 2.6 rev/sec C. 1.5 rev/sec D. Both A and C
2	Direction of motion_______ in circular of motion:	A. Changes off and on B. Changes continuously C. Does not change D. None of them
3	The useful unit of the angular displacement in SI unit is:	A. Degree B. Revolution C. Radian D. Metre
4	When a body moves along a circular path with constant speed, it has an acceleration, which is always directed	A. Along the tangent B. Towards the centre C. Away from the centre D. None of them
5	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. 0.05 m B. 0.08 cm C. 0.8 m D. 0.008 m
6	Direction of motion ______ in circular motion:	A. Changes off and on B. Changes continuously C. Does not change D. None of them
7	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:	A. 5 rad/sec² B. -10 rav/sec² C. -10 rad/sec² D. -5 rav/sec²
8	Einstein's theory about gravity if better than Newton's because it gave explanation of:	A. Inverse square law B. Bending of light C. Both A and B D. None of above
9	INTELSAT operates at frequencies 4, 6, 11, 14 having unit of:	A. KHz B. MHz C. GHz D. BHz
10	The number of "Earth stations" which transmit signals to satellites and receive signals from them are:	A. 3 B. 24 C. 126 D. 200

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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 rotating wheel accelerates up to the value of 0.75 rev/sec2after 2 seconds of its start. Its angular velocity becomes:

If a gymnast sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will

Conventionally the angular velocity is directed at an angle of

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

One radian is equal to:

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:

When angular acceleration is positive, the body rotates:

The center of mass of a sphere lies at:

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:

Angular momentum is a:

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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

Moment of linear momentum is called.

Centripetal acceleration is also called ________ acceleration

A body moving along the circumference of a circle of radius R completes one revolution. The radius of a covered path to the angle subtended at the centre is:

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

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 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:

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

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

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.

One radian is equal to:

Which of the following pairs does not have identical dimensions?

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec2in this case, find radius of the circular path:

Which one is related to angular motion:

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

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

Angular velocity is a:

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A rotating wheel accelerates up to the value of 0.75 rev/sec²after 2 seconds of its start. Its angular velocity becomes:

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 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:

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

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path: