12th Class PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No.2 MCQs

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PHYSICS – 2nd Year
Chapter Name : ELECTROMAGNETISM
Chapter No. 3 [ Test No.2 ]
Multiple Choice Questions
Note : All MCQ’s selected in this test are from OLD F.Sc. board , UHS and PMC(Pakistan Medical Commission) Islamabad Papers.

Book Name : PHYSICS
Chapter No. 3 (Test No. 2)
Chapter Name : ELECTROMAGNETISM
Total MCQ from Text Book : 95
Book Version : 2022
Published By : Punjab Text Book Board Lahore
Approved By : Govt of the Punjab and Federal Ministry for Education
Test Type : MCQ’s
Exam conduct By : Inter Boards of Sindh, KPK, Balochistan, AJK, Gilgit Baltistan, Punjab & Federal
Class / Grade : 12 ( F.Sc. Intermediate)
Total Marks : 95
Total Time : 95 minutes

230

GRADE 12 - PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No. 2

1 / 95

Two parallel straight wires carrying current in same direction will

May repel or attract

Attract each other

No effect

Repel each other

2 / 95

The CRO is used for

Displaying wave form of given voltage

Displaying the wave form of given vibration

Converting A.C into D.C

Displaying the wave form of frequency

3 / 95

The brightness of spot in CRO is controlled by

Anode

Deflecting Plates

Cathode

Grid

4 / 95

The resistance of an ideal ammeter

High

Zero

Small

Infinite

5 / 95

The sensitivity of galvanometer is given by

BN/CA

BAN/C

CAN/B

C/BAN

6 / 95

A device which can measure current, potential difference and resistance is called

Ammeter

Volt meter

AVO meter

Ohmmeter

7 / 95

A horizontal wire of 10cm and mass 0.3gm carries a current of 5A. Which of the following is the magnitude of the magnetic field that can support the weight of wire?

3 x 10-3T

3 x 10-4T

6 x 10-4T

6 x 10-3T

8 / 95

The magnetic force is

Deflecting force

Restoring force

Lorentz force

Electric force

9 / 95

The brightness of spot on CRO screen is controlled by

Plates

Grid

Anode

Cathode

10 / 95

A uniform magnetic field is represented by a set of lines of force which are

None of these

Convergent

Parallel

Divergent

11 / 95

One Tesla is equal to

N-1Am

NA-1m

ANm-1

NA-1m-1

12 / 95

The value of e/m is smallest for

Proton

Electron

B-particals

Positrons

13 / 95

The effective way to increase the sensitivity of moving coil galvanometer is

Increase the number of Turns

Increase the value of constant

Increase the area of Coil

Increase the magnetic field

14 / 95

Voltmeter of range IV has a resistance of 1000?. To extend the range to 10V the additional series required is

9000Ω

1000Ω

11000Ω

10000Ω

15 / 95

The e/m of a neutron is

Greater than electron

Zero

The same as electron

Less than electron

16 / 95

In a current carrying long solenoid the magnetic filed produced does not depend upon

Current flowing through solenoid

Number of turns per unit length

All of the above three

The radius of solenoid

17 / 95

The brightness of the spot on CRO screen is controlled by

Anode

Cathode

Grid

Deflecting Plates

18 / 95

A charged particle enters in a strong magnetic field its k.E.

Increases

Remain constant

Decreases

Increases then Decreses

19 / 95

Two parallel wires carrying current in the same direction:

No effect on each other

Attract each other

Cancel their fields

Repel each other

20 / 95

When an electron is entered in a magnetic field, The magnitude of velocity of electron

Decrease

Increases

Depend on field strength

Is independent of field strength

21 / 95

If a high resistance is connected in series to a galvanometer, then galvanometer is converted into

Multimeter

Ohmmeter

Voltmeter

Ammeter

22 / 95

Two parallel wire carrying current in the same direction attract each other because of

Potential difference between them

Magnetic force between them

Electric force between them

Mutual inductance between them

23 / 95

The galvanometer can be made sensitive by making the factor BAN/C

Constnt

Zero

Small

Large

24 / 95

A 2Mev proton is moving perpendicular to a uniform magnetic field of 2.5T. Which of the following is the magnetic force on proton?

2.5 x 10-10N

8 x10-11N

8 x 10-12N

2.5 x 10-11N

25 / 95

A voltmeter is always connected in circuit in

Parallel

None of these

Both a and b

Series

26 / 95

DMM stands for

None of these

Digital millimeter

Digit measuring Meter

Digital multimeter

27 / 95

If a long hollow copper pipe carries a direct current The magnetic field due to current will be

Only outside the pipe

Neither inside nor outside the pipe

Both inside and outside the pipe

Only inside the pipe

28 / 95

The number of electrons on CRO is controlled by

Filament

Grid

Y deflecting plates

X deflecting plates

29 / 95

Lorentz force is given by

q(V?+E? x B?)

q(E?-V? x B?)

q(E?+V? x B?)

q[E?×(V?+B?)]

30 / 95

Total Flux through a closed surface depends on

Shape of Surface

Charge enclosed only

Medium Only

Charge and Medium

31 / 95

A current carrying loop is placed in a uniform magnetic field. The torque acting on it, does not depend upon

Shape of loop

Current of the loop

Area of loop

Magnetic field

32 / 95

Torque on a current carrying coil is given by

τ = NIABsinα

τ = NIABcosα

τ = NWABsinα

τ = NWABcosα

33 / 95

A charged particle moves through a magnetic field in a direction perpendicular to it. Which of the following remain unchanged for the partical

Velocity

Speed

Acceleration

Direction

34 / 95

A strong magnetic field is applied to a stationary electron then

Electron move in the direction of field

Electron remain stationary

Electron move opposite to the field

Electron start spinning

35 / 95

Which is the correct relation

IT = 10-2G

IT = 102G

IT = 104G

IT = 10-4G

36 / 95

The brightness of the spot on CRO screen is controlled by

Plates

Cathode

Anode

Grid

37 / 95

The unit of magnetic flux is

Tesla

Weber

Tesla2

Weber m-2

38 / 95

Magnetic effect of current was discovered by

Kirchhoff

Faraday

Joule

Oersted

39 / 95

If a charge is at rest in a magnetic field then force on charge is

q VB cosΘ

Zero

q VB sinΘ

q(V? x B?

40 / 95

A magnet drops down a long vertical copper tube. As it falls down the tube its velocity

None of above

Remain constant

Decrease

Increase

41 / 95

A voltmeter is always connected in

Series

Perpendicular

Straight line

Parallel

42 / 95

A charged particle is moving in uniform magnetic field in a circle. The radius of circular path is R. If q nervy of particle is doubled then the new radius will be

R/2

√2R

R/√2

43 / 95

A charged particle enters at 30^° to the magnetic field Its path becomes

Elliptical

Circular

Helical

Straight line

44 / 95

A proper combination of a galvanometer and a series of resistance acts as

Voltmeter

Ohmmeter

Digital Multimeter

Ammeter

45 / 95

In order to measure potential difference voltmeter is always connected in

Neither is series nor in parallel

Parallel

Both A and B

Series

46 / 95

A charged particle moves along a circle under the action of possible electric and magnetic fields. Which of the following is possible

E = 0 B = 0

E≠0 B≠0

E = 0, B≠

E≠0 B = 0

47 / 95

An avometer can also be called as

Digital multimeter

Digital ammeter

Digital voltmeter

Digital ohm-meter

48 / 95

In case of conversion of galvanometer into ammeter the shunt resistance is connected

In parallel

In series

In parallel and In series

Neither parallel nor series

49 / 95

Energy stored per unit volume inside a solenoid is called

Energy density

Volume Charge density

Work

Electric flux

50 / 95

The S.I unit of magnetic flux is given by

NmA-1

Nm2 A-1

Nm-1 A

Nm-7 A-7

51 / 95

The unit of Magnetic Flux

Nm-1A

NmA-1

NmA

Nm-1A-1

52 / 95

In order to increase the range of an ammeter, the shunt resistance is

Decreased

Sometimes is increased and sometimes decreased

Increased

Kept constant

53 / 95

The sensitivity of galvanometer is given by

C/BAN

CAN/B

BN/CA

BAN/C

54 / 95

Emf is induced due to change in

Magnetic flux

Charge

Current

Electric field

55 / 95

If 0.5 T filled over an area of 2(m²) which lies at an angle of 60^° with field. Then the resulting flux will he

0.50 web

0.50 T

0.25T

0.25 Wb

56 / 95

Proton and a - particle moving with same velocity enter a magnetic field perpendicularly. Which of the following is the ratio of radius of proton to a - particle

2-Jan

57 / 95

The value of permeability of free space µ₀ is given by

4 x 10-7 Wb A-1m-1

4 x 107 Wb A-1m-1

4 x 10-7 Wb Am

4 x 10-9 Wb A-1m-1

58 / 95

The brightness of spot in CRO is controlled by

Cathode

Anode

Grid

Deflecting plates

59 / 95

A current flows in a conductor from east to west. The direction of the magnetic field at a point above the conductor is towards

North

West

East

South

60 / 95

The magnetic force is simply a

Restoring force

Reflecting force

Gravitational force

Deflecting force

61 / 95

A power line lies along east-west direction and carries a current of 10A. Which of the following is the force Per meter due to earth's magnetic-field of 10^-4 tesla?

10 5N

10 3N

10 2 N

10 4N

62 / 95

An electron is moving in -a circle of radius r in a uniform magnetic field B. Suddenly the field is reduced to The radius of circle now becomes

r/4

r/2

63 / 95

The sum of electric and magnetic force is called

Newton's force

Maxwell force

Centripetal force

Lorentz force

64 / 95

In order to increase the range of voltmeter, the series resistance is

Sometimes increased and sometimes decreased

Increased

Kept constant

Decreased

65 / 95

If a high resistance is connected in series with the galvanometer the resulting instrument is called

A voltmeter

An ammeter

An AVO meter

A potentiometer

66 / 95

In order to increase sensitivity galvanometer the value of C may by

Increase

Decrease

Remains same

Neither increase nor decrease

67 / 95

A voltmeter is an electrical instrument which is used to measure

Resistance

Potential difference

Current

All of these

68 / 95

The magnetic flux B is equal to

B/A

B? x A?

BA sinΘ

B?.A?

69 / 95

Which of the following in motion can not be deflected by magnetic field?

Neutron

Proton

Electron

Sodium ion

70 / 95

AVOmeter basically consists of

Moving coil galvanometer

Ohmmeter

Ammeter

Voltmeter

71 / 95

The SI unit of magnetic induction is

Weber

Tesla

Gauss

Newton

72 / 95

Shunted galvanometer is called

Ammeter

Potentiometer

Voltmeter

Ohm meter

73 / 95

Torque is produced in a current carrying coil when it is placed in a

Electric field

Gravitational field

Magnetic field

Nuclear field

74 / 95

An electron and a proton enter a magnetic field with same velocity. Which of the following is the ratio of the acceleration

me / mp

√mp / me

mp / me

(√me / mp

75 / 95

The ray which remain undeflected in a magnetic field is

γRays

Cathode rays

βRays

αrays

76 / 95

The sensitivity of a galvanometer can be, increased by

Decreasing the area of the coil

Increasing the magnetic field

Decreasing the number of turns of coil

Using a fine suspension

77 / 95

The sensitivity of galvanometer is given by

C/BAN

CAN/B

B/CAN

BAN/C

78 / 95

Galvanometer can be converted into voltmeter by connecting a high resistance in:

Parallel with galvanometer

Series with galvanometer

Parallel as well as series with the galvanometer

None of these

79 / 95

Brightness of screen of CRO controlled by

Cathode

Anode

Filament

Grid

80 / 95

1 Tesla =

1 N-1Am-1

1NA-1m-1

1N-1Am-2

N-1Am

81 / 95

The SI unit of electric flux is:

N mC-2

Nm-2C-2

NC m-2

N mC2

82 / 95

An electron enters the magnetic field at right angle from left B is into paper. The electron will be deflected

Upward

Towards left

Towards right

Downwards

83 / 95

One Tesla is equal to

NA-1m

N-1Am-1

N Am

NAm-1

84 / 95

The radius of curvature of the path of charged particle in a uniform magnetic field is directly proportional the

Energy of particle

Momentum of particle

Intensity of magnetic field

Charge an particle

85 / 95

The resistance of ideal voltmeter is

Zero

Infinite

Very high

Very low

86 / 95

Force on a charged particle is zero when projected at angle with the magnetic field

180°

270°

0°

90°

87 / 95

The high resistance Rh to convert a galvanometer into a voltmeter is Rh=

(Rg</sub)-(V)/(Ig)

(V/Ig)+(Rg)

(V/Ig)-(Rg)

(Ig)/(I-Ig)

88 / 95

The charges moving perpendicular to magnetic field experience force

Zero

Infinite

Minimum

Maximum

89 / 95

The relation between current I and angle of deflection ? in a moving coil galvanometer is

I∝sinΘ

I∝cosΘ

I∝Θ

I∝(I/Θ)

90 / 95

To convert a-galvanometer into an ammeter, of range I ampere the shunt resistance is given by

Rs = (IgRg)/(I-Ig)

Rs = (IgRg)/(I+Ig)

Rs = (I- Ig)/(IgRg)

91 / 95

Useful device to measure resistance current and voltage is an electronic instrument called

Ohmmeter

Digital Multimeter

Voltmeter

Ammeter

92 / 95

A magnetic needle is kept in a non-uniform magnetic field it experience

Torque but not force

Neither a force nor a torque

Force but not torque

A force and a torque

93 / 95

If the number of turns become double but length remain same, then magnetic field in the solenoid become:

Half

Zero

Double

Remain same

94 / 95

1 tesla is equal to

1Nm-2A-1

1Nm-7 A-7

1Nm-7

1NmA-1

95 / 95

When a charge is projected perpendicular to a uniform magnetic field, its path is

Spiral

Circular

Ellipse

Helix

Your score is

The average score is 34%

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