ECAT Pre General Science Physics Chapter 5 MCQ Test With Answer

Question # 1

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 # 2

Direction of angular momentum is determined by:

Right hand rule A
Head to tail rule B
Left hand rule C
None of them D

Question # 3

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 # 4

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 # 5

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 # 6

Centripetal acceleration is also called ______ acceleration:

Tangential A
Radial B
Angular C
None of them D

Question # 7

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 # 8

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 # 9

Circular motion is an example of motion in:

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

Question # 10

Satellites are held in orbits around Earth by its:

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

Question # 11

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 # 12

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 # 13

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 # 14

Centripetal acceleration is also called _______ acceleration:

Tangential A
Radial B
Angular C
None of them D

Question # 15

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 # 16

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:

38 m/sec A
3.8 m/sec B
0.6 m/sec C
None of these D

Question # 17

Direction of motion _______ in circular motion

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

Question # 18

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 # 19

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

KHz A
MHz B
GHz C
BHz D

Question # 20

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 # 21

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 # 22

Direction of motion_______ in circular of motion:

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

Question # 23

Direction of motion ______ in circular motion:

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

Question # 24

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 # 25

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 # 26

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:

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

Question # 27

Centripetal acceleration is also called ________ acceleration

Tangential A
Radial B
Angular C
None of these 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

The number of countries who manage the largest satellite system is:

3 A
24 B
126 C
200 D

Question # 30

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

Sr.#	Question	Answer
1	Moment of inertia depends upon:	A. Mass B. Selection of axis of rotation C. Both of them D. None of these
2	INTELSAT operates at frequencies 4, 6, 11, 14 having unit of	A. KHz B. MHz C. GHz D. BHz
3	When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:	A. Zero B. Its average velocity C. Its angular displacement D. None of these
4	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 m C. 0.8 m D. 0.008 m
5	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
6	Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.	A. Disc, sphere B. sphere, hoop C. Thin rod, hoop D. Hoop,disc
7	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. 22/7 B. 7 C. 14 D. 21
8	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:	A. Radius of the circle B. Twice the radius C. Thrice the radius D. None of these
9	The useful unit of the angular displacement in SI unit is:	A. Degree B. Revolution C. Radian D. Metre
10	When a body moves with a constant speed in a circle:	A. No work is done on it B. No acceleration is produced in the body C. Velocity remains constant 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 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:

Direction of angular momentum is determined by:

Which of the following pairs does not have identical dimensions?

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

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:

Centripetal acceleration is also called ______ acceleration:

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:

Conventionally the angular velocity is directed at an angle of

Circular motion is an example of motion in:

Satellites are held in orbits around Earth by its:

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:

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 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:

Centripetal acceleration is also called _______ acceleration:

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

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:

Direction of motion _______ in circular motion

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

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

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:

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

Direction of motion_______ in circular of motion:

Direction of motion ______ in circular motion:

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

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 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:

Centripetal acceleration is also called ________ acceleration

The center of mass of a sphere lies at:

The number of countries who manage the largest satellite system is:

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

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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 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 a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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: