PHYSICS 2nd Year MCQs Chapter No.4 ELECTROMAGNETIC INDUCTION Test No.1

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PHYSICS – 2nd Year
Chapter Name : ELECTROMAGNETIC INDUCTION
Chapter No. 4 [Test No.1]
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. 4 (Test No. 1)
Chapter Name : ELECTROMAGNETIC INDUCTION
Total MCQ from Text Book : 89
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 : 89
Total Time : 89 minutes

GRADE 12 - PHYSICS CHAPTER NO.4 ELECTROMAGNETIC INDUCTION Test No.1

1 / 89

In mutual induction, the coil placed with source of electric energy is called

Resistance

Secondary coil

Primary coil

Choke

2 / 89

It is the converse process of magnetic effect of current

Electromagnetic induction

X-ray production

Laser production

Photoelectric effect

3 / 89

If the plane of A.C. generator coil is perpendicular to the field, then emf induced or current in coil is

Zero

Minimum

Maximum

Half of its maximum value

4 / 89

If the plane of A.C. generator coil is parallel to the field, then emf induced or current in coil is

Minimum

Half of its maximum value

Maximum

Zero

5 / 89

weber / ampere is the 'unit of

None of these

Mutual inductance

Self-induction

Mutual induction

6 / 89

The ratio of average emf in the coil to the time rate of change of current in the same coil is called

Self induction

Mutual inductance

Self inductance

Mutual induction

7 / 89

The component mainly used in a D.C. generator is

Slip rings

Vibrator

Split rings (Commutator)

Electromagnet-

8 / 89

An induced emf is produced in a circuit when

Magnetic field produced

None of these

Magnetic flux remain constant

Magnetic flux change

9 / 89

When a motor is over loaded; then the magnitude of back emf

Becomes zero

Increases

Remains constant

Decreases

10 / 89

△Φ/△t has the same unit as that of

Magnetic induction

emf

Current

Charge

11 / 89

The SI unit of self-inductance is

Ampere

Tesla

Henry

Volt

12 / 89

The value, of the induced emf in a loop of wire is directly proportional to the rate of change of ------ through the loop

Electric flux

Magnetic flux

Both (a) and (b)

Current

13 / 89

The device which is used to increase or decrease the value of alternating voltage is called

D.C generator

Electric motor

Transformer

A.C generator

14 / 89

The induced emf in a rotating coil of A.C. generator varies with time

Sinusoidally

None of these

Exponentially

Linearly

15 / 89

The phenomena by which an induced emf is produced due to change of flux is called

Electromagnetism

None of these

Electromagnetic induction

Electrostatic induction

16 / 89

1 VsA^-1 =

1 Nm/A

1 V/A

I T

1 Wb/A

17 / 89

The fact that emf produced by motion of a coil across a magnetic field was discovered by

Coulomb

Oersted

Henry

Henry and Michael faraday

18 / 89

The most common source of an A.C. voltage is

Motor

Generator

Transformer

Cell

19 / 89

The self-inductance of the coil is given by

L = -∈L(Δt)/(ΔI)

L = -(∈L)/(ΔtΔI)

L = -(ΔIΔt)/(∈L)

L = -∈L(ΔI)/(Δt)

20 / 89

The motional emf in a conductor can be increased by

Moving "the conductor parallel to field

Decreasing the length of-conductor

Both and b

Using a strong Magnetic field

21 / 89

If a steady current is passing though a coil then the self induced emf in it will be

Maximum

∈ = -L(ΔI)/(Δt)

Zero

Negative

22 / 89

The back emf of a motor can be expressed as

∈ = V+IR

∈ = (V+IR)/V

∈ = (V+IR)/R

∈ = V-IR

23 / 89

Alternating current generator uses

Commutator

Split rings

Slip rings

Both b and c

24 / 89

In self induction phenomenon, the total flux through the coil is directly proportional to the ----- through the coil

Magnetic field

None of these

Current

Both a and b

25 / 89

When a motor car is started its head light first becomes slight dim because the voltage across the lamp

First a then b

Decreases

Remains same

Increases

26 / 89

Commutator was invented by

Hans Oersted

Joseph Henry

Michael Faraday

William Sturgeon

27 / 89

If back emf in a motor decreases, then it will draw

No current

Small current

More current

Infinite current

28 / 89

If N is the number of turns in a coil, the value of self-inductance varies as

N0

N-2

N2

29 / 89

A device which converts mechanical energy into electrical energy is called

electric generator

transformer

motor

inductor

30 / 89

Current can be induced in a coil by changing the area of the coil in a

Magnetic field parallel to plane of coil

Constant electric field

Constant magnetic field

None of these

31 / 89

The motional emf of a conductor of length L and moving perpendicular to a magnetic field B is equal to

vBLsinΘ

Zero

qvB

vBL

32 / 89

Lenz's law is in accordance With the law Of conservation of

Angular momentum

Energy

Momentum

Charge

33 / 89

Mutual inductance has a practical role in the performance of the

Transformer

D.C. generator

Radio choke

A.C. generator

34 / 89

The amount of torque in D.C. motors, depends upon

Strength of magnetic field

All of these

Current

Area and number of turns of the coil

35 / 89

The energy stored in an inductor is given by

IL2

L2I/2

LI2

LI2/2

36 / 89

If the number of turns and the length of an inductor is doubled, then inductance(L) becomes

37 / 89

The maximum emf produced by an alternating generator is

NωABcosΘ

None of these

NωAB

NωABsinΘ

38 / 89

In D.C. generator, output of every coil is tapped only as it reaches its

Intermediate value

None of these

Least value

Peak value

39 / 89

Faraday law is given by

∈ = -(Δφ)/(NΔt)

∈ = -L(Δt)/(Δφ)

∈ = -N(Δφ)/(Δt)

∈ = -L(Δφ)/(Δt)

40 / 89

The self inductance of the coil depends upon

Core material

Number turns of coil

Area of cross-section

All of these

41 / 89

Lenz's law deals directly with the

Direction of induced current

Magnitude of induced emf

Direction of induced emf

Both direction and magnitude of emf

42 / 89

If the coil is wound on an iron core, the flux through it will

Decrease

Remain constant

Be zero

Increase

43 / 89

The emf induced in the coil of A.C. generator will be maximum when the angle between the plane of coil and the magnetic field is

45℉

30℉

0℉

90℉

44 / 89

In case of alternating current, the average value of current and voltage is

Greater than zero

Zero

Less than zero

45 / 89

The principle of an electric generator is based on

Coulomb's law

Ampere's law

Faraday's law

Lenz's law

46 / 89

When current flows through the armature coil, the force on the conductor produces

Heat

Light

Torque

None of these

47 / 89

If a conductor is placed perpendicular to a magnetic field B is then motional emf will be

Zero

-vBL

Both a and b

Maximum

48 / 89

A generator running in reverse may be called as

Rectifier

Motor

Galvanometer

Transformer

49 / 89

Faraday's law is based upon law of conservation of

None of these

Energy

Charge

Mass

50 / 89

The device in the circuit that consumes electrical energy is called

Load

Capacitor

Inductor

Generator

51 / 89

The only difference between construction of D.C. generator and an A.C. generator is that of

Carbon brushes

Armature

Commutator

Magnetic field

52 / 89

The induced emf in a motor which opposes the applied emf running the motor is called

Motional emf

Static emf

All of these

Back emf

53 / 89

If a conductor of length 1 m is moved with velocity V across a magnetic field B at an angle of 30° with B ,then motional emf will be

0.866vBL

1/2 vB

1/2vBL

None of these

54 / 89

SI unit of mutual inductance is

Tesla

Ampere

Henry

volt/ampere

55 / 89

The fluctuations of the output of generator can be reduced by

Using many resistors

Using slip ring

Using many coils

Using commutator

56 / 89

The phenomenon in which changing current in a coil induces an emf in itself is called

Mutual induction

Self inductance

Self induction

Mutual inductance

57 / 89

When motor is started, the back emf is

Constant

Almost zero

Zero

Very large

58 / 89

A.C current reverses its direction

T times /sec

Both b and c

F time/sec

Once/cycle

59 / 89

The working of electric motor is reversed of

Transformer

Generator

All of these

Electric fan

60 / 89

The coil used to obtain the output by mutual induction phenomenon is known as

None of these

Primary coil

Resistance

secondary coil

61 / 89

The current flowing through a coil due to induced emf hi it depends upon

Area of the coil

All of these

Resistance of the coil

Shape of the coil

62 / 89

The direction of the induced current in a certain coil can easily be found by using

Faraday's law

Ampere's law

Lenz's law

Right hand rule

63 / 89

An inductor may store energy in

Its electric field

Both a and b

Its coil

Its magnetic field

64 / 89

If the length of a conductor placed parallel to magnetic field is doubled, the induced emf

Becomes double

Zero

Remains constant

Reduces to half

65 / 89

The number of coils wound around an iron cylinder and rotated in magnetic field is called

Turbine

Commutator

An armature

Transformer

66 / 89

Commutator was invented in

1934

1943

1734

1834

67 / 89

The working of A.C. generator is based upon the phenomenon of

Mutual induction

All of these

Electromagnetic induction

Self induction

68 / 89

The induced emf lasts so long as the magnetic flux keeps

None of these

Either of these

Changing

Constant

69 / 89

A motor of zero back emf draws ---- current

Constant

Maximum

Minimum

70 / 89

The ratio Of the emf induced in the secondary coil to the rate of change of current in the primary coil is known as

Self-induction

Mutual induction

Self inductance

Mutual inductance

71 / 89

Self inductance (L) of a coil is

µ0n2AI

µ0N2AI

µ0nAI2

µ0n2I

72 / 89

A motor is a device which converts electrical energy into

Chemical energy

Mechanical energy

Light energy

Heat energy

73 / 89

Which one of the following expressions for mutual inductance is correct

M = (Nsφs)/(Ip)

M = (Ip)/(Nsφs)

M = (Ns)/(Ipφs)

M = (φs)/(NsIp)

74 / 89

Back motor effect in generators is in accordance with law of conservation of

Charge

Energy

Momentum

Mass

75 / 89

The, phenomenon of induced emf was observed by Faraday and Henry in

None of these

Resistance of conductor

Magnetic field strength

Sliced o1 conductor

76 / 89

The mathematical expression for self-inductance of coil is given by

L = Nφ/I

NI = Lφ

NL = φI

N = LI/φ

77 / 89

Energy stored per unit volume inside the solenoid is called

Mass density

Energy density

Volume charge density

Charge density

78 / 89

In motional emf experiment when the system reaches an equilibrium state

B = v E0

E0 = vB

qvB = mg

B/E0 = v

79 / 89

Motional emf does not depend upon

Magnetic field strength

Resistance of conductor

Speed of conductor

None of these

80 / 89

The inductance in a coil plays the same role in AC circuits as in ----- play in mechanics

Torque

Force

None of these

Mass

81 / 89

Induced current always acts to ------- the magnetic flux through the circuit

Increase

Oppose

Remain same

Decrease

82 / 89

In alternating current, inductors behaves like

Capacitors

None of these

Resistors

Thermistors

83 / 89

The emf induced by the motion of a conductor across a magnetic field is called

Back emf

Induced emf

Motional emf

Both b and c

84 / 89

One henry is equal to

V-1sA

NmA-1

VsA-1

Vs-1A

85 / 89

The self inductance of a coil ---- when a soft iron is placed into it

Remains the same

First increases then decreases

Decreases

Increases

86 / 89

The mutual inductance of coils depends upon

Distance between the coils

Number of turns of the coils

The area of cross-section of the coils

All of these

87 / 89

A metallic ring is attached to wall of a room When the north pole of bar magnet is brought near the ring, the induced current in the ring is

Infinite

In anti-clockwise direction

Zero

In clockwise direction

88 / 89

The mutual inductance of two coils is given by the relation

M = -(∈)/(ΔIp/Δt)

M = -(∈)/(ΔIp)

M = -(∈)/(ΔtΔIp)

M = -(∈)/(Δt/ΔIp)

89 / 89

Alternating emf is produced by rotating a rectangular coil of wire in

Nuclear field

Magnetic field

Gravitational field

Electric field

Your score is

The average score is 45%

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