ECAT Pre General Science Physics Chapter 5 MCQ Test With Answer

Question # 1

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 # 2

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 # 3

Centripetal acceleration is also called ______ acceleration

Tangential A
Radial B
Angular C
None of them 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

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 # 6

One radian is

Greater than one degree A
Less than one degree B
Equal to one degree C
None of these D

Question # 7

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 # 8

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 # 9

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 # 10

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 0.8 m sec^-2comes out to:

980 N A
580 N B
1380 N C
Zero D

Question # 11

The useful unit of angular replacement in SI unit is:

Degree A
Revolution B
Radian C
Metre D

Question # 12

Direction of motion _________ in circular motion

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

Question # 13

Circular motion is an example of motion in:

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

Question # 14

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:

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

Question # 15

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 # 16

Centripetal acceleration is also called ________ acceleration

Tangential A
Radial B
Angular C
None of these D

Question # 17

One radian is equal to:

30.3° A
45.3° B
50.3° C
57.3° D

Question # 18

Angular momentum is a:

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

Question # 19

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 # 20

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:

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

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

Degree A
Revolution B
Radian C
Metre 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

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 # 25

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 # 26

A rotating body tends to be slower, when its angular acceleration is:

Positive A
Negative B
Zero C
Infinity D

Question # 27

One radian is equal to:

30.3° A
45.3° B
50.3° C
57.3° D

Question # 28

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 # 29

The instantaneous acceleration of a body moving with constant speed in a circle:

Remains constant A
Is called centripetal acceleration B
Tangential acceleration C
None of these D

Question # 30

When a 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

Sr.#	Question	Answer
1	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
2	When angular acceleration is positive, the body rotates:	A. Slower B. Slowest C. Faster D. None of these
3	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:	A. 38 m/sec B. 3.8 m/sec C. 0.6 m/sec D. None of these
4	INTELSAT operates at frequencies 4, 6, 11, 14 having unit of:	A. KHz B. MHz C. GHz D. BHz
5	The center of mass of a sphere lies at:	A. The axis of the sphere B. Circumference of sphere C. Center of the sphere D. None of them
6	Conventionally the angular velocity is directed at an angle of	A. 90° to the axis of rotation B. 30° to the axis of rotation C. 0° to the axis of rotation D. None of the above
7	Circular motion is an example of motion in:	A. One dimension B. Two dimensions C. Three dimensions D. None of these
8	Moment of inertia depends upon:	A. Mass B. Selection of axis of rotation C. Both of them D. None of these
9	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
10	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

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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 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 rev/sec which is reduced to 38 rad/sec in 5 seconds when brakes are applied. Its angular acceleration is:

Centripetal acceleration is also called ______ acceleration

Conventionally the angular velocity is directed to 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:

One radian is

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

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

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

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 0.8 m sec-2comes out to:

The useful unit of angular replacement in SI unit is:

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 where the wheel turns through an angle is 14.3 degrees. The radius of the wheel is:

A body can have constant velocity when it follows:

Centripetal acceleration is also called ________ acceleration

One radian is equal to:

Angular momentum is a:

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 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:

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

The useful unit of the angular displacement in SI unit 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 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:

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

A rotating body tends to be slower, when its angular acceleration is:

One radian is equal to:

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

The instantaneous acceleration of a body moving with constant speed in a circle:

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

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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:

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

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