ECAT Pre General Science Physics Chapter 5 MCQ Test With Answer

Question # 1

Centripetal acceleration is also called _______ acceleration:

Tangential A
Radial B
Angular C
None of them D

Question # 2

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

Question # 3

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 # 4

Angular velocity is a:

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

Question # 5

One radian is:

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

Question # 6

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 # 7

Angular momentum is a:

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

Question # 8

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 # 9

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 # 10

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 # 11

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 # 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

Direction of motion ______ in circular motion:

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

Question # 14

Satellites are held in orbits around Earth by its:

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

Question # 15

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 # 16

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 # 17

______ plays the same role during angular motion as played by the mass in linear motion

Torque A
Angular Momentum B
Moment of a force C
Moment of inertia D

Question # 18

Centripetal force performs:

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

Question # 19

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

3 A
24 B
126 C
200 D

Question # 20

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 # 21

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 # 22

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 # 23

Centripetal acceleration is also called ______ acceleration:

Tangential A
Radial B
Angular C
None of them D

Question # 24

In rotational motion, analogue of force F us called:

Couple A
Torque B
Mass C
Moment of intertia D

Question # 25

Moment of inertia depends upon:

Mass A
Selection of axis of rotation B
Both of them C
None of these D

Question # 26

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 # 27

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 # 28

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

KHz A
MHz B
GHz C
BHz D

Question # 29

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 # 30

One radian is equal to:

30.3° A
45.3° B
50.3° C
57.3° D

Sr.#	Question	Answer
1	One radian is:	A. Greater than one degree B. Less than one degree C. Equal to degree D. none of these
2	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
3	Conventional 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 above
4	Centripetal acceleration is also called _______ acceleration:	A. Tangential B. Radial C. Angular D. None of them
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	Moment of linear momentum is called.	A. Moment arm B. Moment of inertia C. Inertia D. Angular momentum
7	Direction of motion _______ in circular motion	A. Changes off and on B. Changes continuously C. Does not change D. None of them
8	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. Increase B. Decrease C. Remains constant D. None of these
9	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
10	Direction of angular momentum is determined by:	A. Right hand rule B. Head to tail rule C. Left hand rule D. None of them

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