100 Important Basic MCQs (Level -1) on Electromagnetic Induction, Physics (Unit-Wise MCQs Practice):

👉Physics MCQs Hub – Unit wise Physics MCQs Practice (Main-Page)👈

Whether you are preparing for board examinations, chapter tests, college assessments, or competitive entrance exams (MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST, and other engineering or medical admission tests), this comprehensive MCQ collection is designed to help you master Electromagnetic Induction. The questions are arranged progressively—from basic concepts to advanced numerical problems and higher-order thinking—providing complete and systematic exam preparation.

This chapter-wise MCQ collection includes:

100 Basic MCQs Level-1 (1–100) – Covering Faraday's Law, Lenz's Law, magnetic flux, induced EMF, Fleming's Right-Hand Rule, self-induction, mutual induction, transformers, AC generators, and fundamental concepts.

100 Advanced & Numerical MCQs (101–200) – Focusing on induced EMF calculations, motional EMF, transformer equations, efficiency, power transmission, magnetic flux, and practical numerical problems.

50 Higher-Order Thinking Skills (HOTS) MCQs (201–250) – Designed to strengthen conceptual understanding, analytical reasoning, and advanced problem-solving skills.

50 Challenging MCQs Quiz with Answers – A carefully selected mix of conceptual, numerical, and HOTS questions for quick revision, self-assessment, and complete exam preparation.

This MCQ collection covers:

Faraday's and Lenz's Laws
Magnetic flux and induced EMF
Motional EMF and Fleming's Right-Hand Rule
Self and mutual induction
Eddy currents and their applications
AC generators and alternating current
Transformers, efficiency, and power transmission
Practical applications of electromagnetic induction

Every MCQ includes the correct answer with a clear, concept-based explanation to strengthen understanding, improve problem-solving skills, and reinforce key physics concepts.

This question bank helps students to:

Build a strong conceptual foundation
Master electromagnetic induction and transformers
Improve numerical and analytical problem-solving skills
Strengthen conceptual understanding through HOTS questions
Avoid common examination mistakes
Increase speed, accuracy, and confidence
Prepare effectively for board and competitive entrance examinations

With 250 carefully selected MCQs organized into 100 Basic, 100 Advanced & Numerical, and 50 HOTS questions, plus a 50 Challenging MCQs Quiz, this all-in-one MCQ bank provides complete preparation for Electromagnetic Induction and serves as an excellent resource for both school and competitive physics examinations.

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Electromagnetic Induction MCQs Level 1 – 100 Basic MCQs (1–100)

MCQ No. 1

Electromagnetic induction is the phenomenon of producing:

a. Electric charge

b. Electric current by changing magnetic flux

c. Magnetic field from electric field

d. Static electricity

Correct answer: b. Electric current by changing magnetic flux

Explanation: Electromagnetic induction is the production of an induced EMF or current in a conductor due to a change in magnetic flux linked with it.

MCQ No. 2

The scientist who discovered electromagnetic induction was:

a. James Clerk Maxwell

b. André-Marie Ampère

c. Michael Faraday

d. Nikola Tesla

Correct answer: c. Michael Faraday

Explanation: Michael Faraday discovered electromagnetic induction in 1831 through a series of experiments.

MCQ No. 3

According to Faraday's first law, an EMF is induced when:

a. Current remains constant

b. Resistance changes

c. Magnetic flux linked with a circuit changes

d. Voltage becomes zero

Correct answer: c. Magnetic flux linked with a circuit changes

Explanation: A changing magnetic flux through a closed circuit induces an EMF.

MCQ No. 4

The SI unit of magnetic flux is:

a. Tesla

b. Weber

c. Henry

d. Volt

Correct answer: b. Weber

Explanation: Magnetic flux is measured in weber (Wb), where 1 Wb = 1 T·m².

MCQ No. 5

Magnetic flux through a surface is given by:

a. Φ = BA

b. Φ = BA cos θ

c. Φ = B/A

d. Φ = B²A

Correct answer: b. Φ = BA cos θ

Explanation: Magnetic flux depends on the magnetic field, area, and the angle between the magnetic field and the normal to the surface.

MCQ No. 6

The SI unit of induced EMF is:

a. Ampere

b. Coulomb

c. Volt

d. Weber

Correct answer: c. Volt

Explanation: Induced EMF is a potential difference and is measured in volts.

MCQ No. 7

Faraday's second law states that induced EMF is proportional to:

a. Magnetic field only

b. Area only

c. Rate of change of magnetic flux

d. Number of electrons

Correct answer: c. Rate of change of magnetic flux

Explanation: The greater the rate of change of magnetic flux, the larger the induced EMF.

MCQ No. 8

The mathematical expression of Faraday's law is:

a. ε = NΔΦ

b. ε = −N(dΦ/dt)

c. ε = IR

d. ε = BLv²

Correct answer: b. ε = −N(dΦ/dt)

Explanation: The negative sign represents Lenz's law.

MCQ No. 9

The negative sign in Faraday's law represents:

a. Ohm's law

b. Kirchhoff's law

c. Lenz's law

d. Coulomb's law

Correct answer: c. Lenz's law

Explanation: It indicates that the induced current opposes the change producing it.

MCQ No. 10

Lenz's law is based on the principle of:

a. Conservation of energy

b. Newton's laws

c. Coulomb's law

d. Hooke's law

Correct answer: a. Conservation of energy

Explanation: Lenz's law prevents the creation of energy from nothing by opposing the change in magnetic flux.

MCQ No. 11

An induced current is produced only when:

a. Magnetic field is constant

b. Magnetic flux changes

c. Current becomes zero

d. Resistance decreases

Correct answer: b. Magnetic flux changes

Explanation: A constant magnetic flux does not induce any EMF.

MCQ No. 12

If a magnet is kept stationary inside a coil, the induced EMF is:

a. Maximum

b. Minimum

c. Zero

d. Infinite

Correct answer: c. Zero

Explanation: No change in magnetic flux means no induced EMF.

MCQ No. 13

Moving a magnet towards a coil causes:

a. No current

b. Induced current

c. Electric shock

d. Electrostatic charge

Correct answer: b. Induced current

Explanation: The changing magnetic flux through the coil induces an EMF.

MCQ No. 14

If the speed of a moving magnet increases, the induced EMF:

a. Decreases

b. Becomes zero

c. Increases

d. Remains constant

Correct answer: c. Increases

Explanation: A faster-moving magnet changes the magnetic flux more rapidly, increasing the induced EMF.

MCQ No. 15

The direction of induced current is determined by:

a. Fleming's Left-Hand Rule

b. Lenz's Law

c. Right-Hand Thumb Rule

d. Ampere's Law

Correct answer: b. Lenz's Law

Explanation: Lenz's law gives the direction of induced current.

MCQ No. 16

Fleming's Right-Hand Rule is used to determine the direction of:

a. Force on a conductor

b. Induced current

c. Electric field

d. Magnetic moment

Correct answer: b. Induced current

Explanation: Fleming's Right-Hand Rule predicts the direction of induced current in a generator.

MCQ No. 17

Magnetic flux increases when:

a. Magnetic field strength increases

b. Area decreases

c. Angle becomes 90°

d. Magnetic field becomes zero

Correct answer: a. Magnetic field strength increases

Explanation: Since Φ = BA cos θ, increasing B increases the magnetic flux.

MCQ No. 18

Magnetic flux becomes zero when the angle between the magnetic field and the normal to the surface is:

a. 0°

b. 30°

c. 60°

d. 90°

Correct answer: d. 90°

Explanation: Since cos 90° = 0, the magnetic flux becomes zero.

MCQ No. 19

A galvanometer connected to a coil detects:

a. Electric field

b. Induced current

c. Resistance

d. Magnetic force

Correct answer: b. Induced current

Explanation: A galvanometer shows the presence and direction of induced current.

MCQ No. 20

The induced current disappears when:

a. The magnetic field is changing

b. Relative motion between magnet and coil stops

c. The magnet moves faster

d. The number of turns increases

Correct answer: b. Relative motion between magnet and coil stops

Explanation: Without a change in magnetic flux, no induced current is produced.

MCQ No. 21

Increasing the number of turns in a coil will:

a. Decrease the induced EMF

b. Increase the induced EMF

c. Have no effect

d. Reduce the magnetic field

Correct answer: b. Increase the induced EMF

Explanation: According to Faraday's law, induced EMF is directly proportional to the number of turns.

MCQ No. 22

The induced EMF depends on:

a. Rate of change of magnetic flux

b. Number of turns

c. Orientation of the coil

d. All of the above

Correct answer: d. All of the above

Explanation: All these factors affect the magnitude of the induced EMF.

MCQ No. 23

Which quantity must change to induce an EMF?

a. Electric charge

b. Magnetic flux

c. Resistance

d. Voltage

Correct answer: b. Magnetic flux

Explanation: A changing magnetic flux is the fundamental requirement for electromagnetic induction.

MCQ No. 24

Electromagnetic induction is widely used in:

a. Generators

b. Transformers

c. Induction cookers

d. All of the above

Correct answer: d. All of the above

Explanation: Electromagnetic induction is the operating principle behind generators, transformers, induction cookers, and many other electrical devices.

MCQ No. 25

Which of the following is not required for electromagnetic induction?

a. A conductor

b. Change in magnetic flux

c. Relative motion or changing magnetic field

d. Permanent electric charge on the conductor

Correct answer: d. Permanent electric charge on the conductor

Explanation: Electromagnetic induction requires a conductor and a changing magnetic flux. A conductor does not need to carry a permanent electric charge.

MCQ No. 26

The induced EMF in a conductor depends upon:

a. Magnitude of current

b. Rate of change of magnetic flux

c. Resistance of conductor

d. Length of conductor only

Correct answer: b. Rate of change of magnetic flux

Explanation: According to Faraday's second law, induced EMF is directly proportional to the rate of change of magnetic flux.

MCQ No. 27

If the magnetic flux through a coil changes more rapidly, the induced EMF will:

a. Decrease

b. Remain constant

c. Increase

d. Become zero

Correct answer: c. Increase

Explanation: A greater rate of change of magnetic flux produces a larger induced EMF.

MCQ No. 28

When the magnetic field through a coil remains constant, the induced EMF is:

a. Maximum

b. Minimum

c. Zero

d. Infinite

Correct answer: c. Zero

Explanation: No change in magnetic flux means no induced EMF.

MCQ No. 29

The direction of induced current always:

a. Assists the change producing it

b. Opposes the change producing it

c. Is independent of magnetic flux

d. Is always clockwise

Correct answer: b. Opposes the change producing it

Explanation: This is the statement of Lenz's law.

MCQ No. 30

Lenz's law helps to explain the principle of:

a. Conservation of energy

b. Conservation of mass

c. Newton's laws

d. Coulomb's law

Correct answer: a. Conservation of energy

Explanation: The induced current always opposes the cause producing it, ensuring conservation of energy.

MCQ No. 31

If a magnet is moved away from a coil, the induced current:

a. Stops immediately

b. Reverses its direction

c. Remains unchanged

d. Produces no magnetic field

Correct answer: b. Reverses its direction

Explanation: Reversing the motion changes the direction of induced current according to Lenz's law.

MCQ No. 32

The faster a conductor cuts magnetic field lines, the induced EMF becomes:

a. Smaller

b. Larger

c. Zero

d. Constant

Correct answer: b. Larger

Explanation: Faster motion causes a greater rate of change of magnetic flux.

MCQ No. 33

The SI unit of magnetic flux density is:

a. Weber

b. Tesla

c. Henry

d. Volt

Correct answer: b. Tesla

Explanation: Magnetic flux density (B) is measured in tesla (T).

MCQ No. 34

A conductor moving perpendicular to a magnetic field develops:

a. Electrostatic charge only

b. Induced EMF

c. Constant resistance

d. Magnetic permeability

Correct answer: b. Induced EMF

Explanation: This phenomenon is called motional EMF.

MCQ No. 35

The formula for motional EMF is:

a. ε = Bℓv

b. ε = IR

c. ε = qV

d. ε = B²A

Correct answer: a. ε = Bℓv

Explanation: A conductor of length ℓ moving with velocity v perpendicular to magnetic field B develops an EMF equal to Bℓv.

MCQ No. 36

Motional EMF is maximum when the conductor moves:

a. Parallel to the magnetic field

b. Perpendicular to the magnetic field

c. At 45°

d. At rest

Correct answer: b. Perpendicular to the magnetic field

Explanation: Maximum magnetic flux is cut when motion is perpendicular to the field.

MCQ No. 37

Which device works directly on the principle of motional EMF?

a. Electric generator

b. Ammeter

c. Voltmeter

d. Resistor

Correct answer: a. Electric generator

Explanation: A generator converts mechanical energy into electrical energy by electromagnetic induction.

MCQ No. 38

A conductor moving parallel to magnetic field lines produces:

a. Maximum EMF

b. Half EMF

c. Zero EMF

d. Infinite EMF

Correct answer: c. Zero EMF

Explanation: No magnetic field lines are cut when motion is parallel to the field.

MCQ No. 39

The induced EMF increases when the number of turns of the coil is:

a. Reduced

b. Doubled

c. Zero

d. Constant

Correct answer: b. Doubled

Explanation: Faraday's law states that induced EMF is proportional to the number of turns.

MCQ No. 40

A larger coil area produces:

a. Less magnetic flux

b. More magnetic flux

c. No magnetic flux

d. Constant EMF

Correct answer: b. More magnetic flux

Explanation: Since Φ = BA cos θ, increasing area increases magnetic flux.

MCQ No. 41

Which of the following changes magnetic flux?

a. Magnetic field strength

b. Area of the coil

c. Orientation of the coil

d. All of the above

Correct answer: d. All of the above

Explanation: Magnetic flux depends on magnetic field, area, and orientation.

MCQ No. 42

The induced current in a closed circuit exists:

a. Only while magnetic flux is changing

b. Forever

c. Only at high voltage

d. Only in superconductors

Correct answer: a. Only while magnetic flux is changing

Explanation: Once the magnetic flux becomes constant, induced current disappears.

MCQ No. 43

A galvanometer connected to an induced-current experiment mainly detects:

a. Temperature

b. Pressure

c. Current

d. Resistance

Correct answer: c. Current

Explanation: A galvanometer indicates the presence and direction of current.

MCQ No. 44

The magnetic field produced by the induced current:

a. Supports the change in flux

b. Opposes the change in flux

c. Has no direction

d. Is always upward

Correct answer: b. Opposes the change in flux

Explanation: This follows directly from Lenz's law.

MCQ No. 45

The induced EMF becomes zero if:

a. Flux changes rapidly

b. The conductor moves faster

c. Magnetic flux remains unchanged

d. Number of turns increases

Correct answer: c. Magnetic flux remains unchanged

Explanation: No change in magnetic flux means no induced EMF.

MCQ No. 46

The principle of electromagnetic induction is mainly used to convert:

a. Heat energy into electrical energy

b. Mechanical energy into electrical energy

c. Chemical energy into light energy

d. Electrical energy into sound energy

Correct answer: b. Mechanical energy into electrical energy

Explanation: Electric generators work by converting mechanical energy into electrical energy.

MCQ No. 47

A seismometer uses electromagnetic induction to:

a. Produce sound

b. Detect ground vibrations

c. Measure temperature

d. Produce heat

Correct answer: b. Detect ground vibrations

Explanation: The relative motion between a coil and a magnet during earthquakes induces an EMF that is used to record ground motion.

MCQ No. 48

Which quantity changes continuously in an AC generator?

a. Resistance

b. Magnetic flux linked with the coil

c. Length of the conductor

d. Charge on the coil

Correct answer: b. Magnetic flux linked with the coil

Explanation: Continuous rotation of the coil changes magnetic flux and induces alternating EMF.

MCQ No. 49

Faraday's laws are applicable to:

a. Closed conducting circuits

b. Insulators only

c. Permanent magnets only

d. Vacuum only

Correct answer: a. Closed conducting circuits

Explanation: An induced EMF and current are produced in closed conducting circuits when magnetic flux changes.

MCQ No. 50

Which of the following best summarizes electromagnetic induction?

a. Production of magnetic field by current

b. Production of current by changing magnetic flux

c. Production of heat by resistance

d. Production of charge by friction

Correct answer: b. Production of current by changing magnetic flux

Explanation: Electromagnetic induction is the production of an EMF or current in a conductor due to a change in magnetic flux.

MCQ No. 51

Self-inductance is the property of a coil to:

a. Store electric charge

b. Oppose changes in its own current

c. Increase resistance

d. Produce heat

Correct answer: b. Oppose changes in its own current

Explanation: Self-inductance is the property of a conductor or coil to oppose any change in the current flowing through it.

MCQ No. 52

The SI unit of self-inductance is:

a. Weber

b. Tesla

c. Henry

d. Volt

Correct answer: c. Henry

Explanation: The SI unit of inductance is the henry (H), named after Joseph Henry.

MCQ No. 53

One henry is equal to:

a. One volt per ampere

b. One weber per ampere

c. One tesla per metre

d. One coulomb per volt

Correct answer: b. One weber per ampere

Explanation: $1\,\text{H}=1\,\text{Wb/A}$ .

MCQ No. 54

The induced EMF due to self-inductance is called:

a. Terminal voltage

b. Self-induced EMF

c. Motional EMF

d. Drift voltage

Correct answer: b. Self-induced EMF

Explanation: A changing current in a coil induces an EMF in the same coil, called self-induced EMF.

MCQ No. 55

The expression for self-induced EMF is:

a. ε = IR

b. ε = −L (dI/dt)

c. ε = Bℓv

d. ε = qvB

Correct answer: b. ε = −L (dI/dt)

Explanation: The induced EMF is proportional to the rate of change of current in the coil.

MCQ No. 56

The negative sign in the equation ε = −L(dI/dt) indicates:

a. Loss of energy

b. Lenz's law

c. Ohm's law

d. Kirchhoff's law

Correct answer: b. Lenz's law

Explanation: The induced EMF always opposes the change in current producing it.

MCQ No. 57

Self-induced EMF is produced when:

a. Current remains constant

b. Current changes with time

c. Resistance becomes zero

d. Voltage becomes constant

Correct answer: b. Current changes with time

Explanation: A changing current changes the magnetic flux linked with the coil.

MCQ No. 58

The inductance of a coil increases with:

a. Fewer turns

b. More turns

c. Smaller area

d. Higher resistance

Correct answer: b. More turns

Explanation: Inductance is directly proportional to the square of the number of turns.

MCQ No. 59

Increasing the cross-sectional area of a solenoid will:

a. Decrease inductance

b. Increase inductance

c. Not affect inductance

d. Reduce induced EMF to zero

Correct answer: b. Increase inductance

Explanation: Inductance is directly proportional to the cross-sectional area.

MCQ No. 60

If the length of a solenoid is increased while keeping other factors constant, its inductance:

a. Increases

b. Decreases

c. Remains constant

d. Becomes zero

Correct answer: b. Decreases

Explanation: Inductance is inversely proportional to the length of the solenoid.

MCQ No. 61

A soft iron core increases the inductance of a coil because it has:

a. High resistance

b. High magnetic permeability

c. Low density

d. High conductivity

Correct answer: b. High magnetic permeability

Explanation: Soft iron concentrates magnetic field lines, increasing inductance.

MCQ No. 62

The inductance of a solenoid depends upon:

a. Number of turns

b. Length

c. Core material

d. All of the above

Correct answer: d. All of the above

Explanation: Geometry and magnetic permeability determine the inductance.

MCQ No. 63

Mutual inductance exists between:

a. A battery and resistor

b. Two nearby coils

c. Two capacitors only

d. Two voltmeters

Correct answer: b. Two nearby coils

Explanation: A changing current in one coil induces an EMF in another nearby coil.

MCQ No. 64

Mutual inductance is represented by the symbol:

a. L

b. Φ

c. M

d. B

Correct answer: c. M

Explanation: The symbol M denotes mutual inductance.

MCQ No. 65

The SI unit of mutual inductance is:

a. Henry

b. Weber

c. Tesla

d. Volt

Correct answer: a. Henry

Explanation: Mutual inductance has the same SI unit as self-inductance.

MCQ No. 66

Mutual inductance depends mainly on:

a. Distance between coils

b. Number of turns

c. Orientation of coils

d. All of the above

Correct answer: d. All of the above

Explanation: All these factors influence the magnetic coupling between the coils.

MCQ No. 67

The induced EMF in the secondary coil is produced due to:

a. Constant current

b. Changing magnetic flux

c. Constant resistance

d. Electric charge

Correct answer: b. Changing magnetic flux

Explanation: A changing magnetic field from the primary coil links the secondary coil.

MCQ No. 68

Mutual induction is the operating principle of a:

a. Transformer

b. Galvanometer

c. Ammeter

d. Rheostat

Correct answer: a. Transformer

Explanation: Transformers transfer electrical energy through mutual induction.

MCQ No. 69

An electric generator converts:

a. Electrical energy into mechanical energy

b. Mechanical energy into electrical energy

c. Heat into electrical energy

d. Chemical energy into sound

Correct answer: b. Mechanical energy into electrical energy

Explanation: Generators work on the principle of electromagnetic induction.

MCQ No. 70

The working principle of an AC generator is:

a. Electrostatic induction

b. Electromagnetic induction

c. Joule's law

d. Coulomb's law

Correct answer: b. Electromagnetic induction

Explanation: Rotation of a coil in a magnetic field changes magnetic flux and induces an alternating EMF.

MCQ No. 71

The rotating part of a simple AC generator is the:

a. Field magnet

b. Coil (armature)

c. Carbon brush

d. Transformer core

Correct answer: b. Coil (armature)

Explanation: The armature rotates inside the magnetic field to produce an induced EMF.

MCQ No. 72

In an AC generator, electrical contact with the rotating coil is maintained by:

a. Split rings

b. Slip rings and carbon brushes

c. Capacitors

d. Permanent magnets

Correct answer: b. Slip rings and carbon brushes

Explanation: Slip rings rotate with the coil while carbon brushes collect the induced current.

MCQ No. 73

The output of an AC generator is:

a. Direct current

b. Alternating current

c. Constant voltage only

d. Pulsed DC only

Correct answer: b. Alternating current

Explanation: The direction of induced EMF changes every half rotation.

MCQ No. 74

One complete rotation of the generator coil produces:

a. Constant DC

b. One complete AC cycle

c. Zero EMF

d. Continuous positive voltage

Correct answer: b. One complete AC cycle

Explanation: During one full rotation, the induced EMF completes one sinusoidal cycle.

MCQ No. 75

Which of the following devices works directly on electromagnetic induction?

a. Electric generator

b. Transformer

c. Seismometer

d. All of the above

Correct answer: d. All of the above

Explanation: These devices operate using the principle of electromagnetic induction, either through changing magnetic flux or mutual induction.

MCQ No. 76

The induced emf in a coil depends upon:
a. Number of turns only
b. Rate of change of magnetic flux
c. Coil resistance only
d. Coil temperature only

Correct answer: b. Rate of change of magnetic flux

Explanation: According to Faraday's law, induced emf is directly proportional to the rate of change of magnetic flux through the coil.

MCQ No. 77

If the magnetic flux through a coil remains constant, the induced emf is:
a. Maximum
b. Zero
c. Equal to magnetic field
d. Infinite

Correct answer: b. Zero

Explanation: No change in magnetic flux means no induced emf.

MCQ No. 78

An increase in the number of turns of a coil results in:
a. Smaller induced emf
b. Greater induced emf
c. No change
d. Zero current

Correct answer: b. Greater induced emf

Explanation: Induced emf is directly proportional to the number of turns.

MCQ No. 79

The SI unit of mutual inductance is:
a. Weber
b. Tesla
c. Henry
d. Volt

Correct answer: c. Henry

Explanation: Mutual inductance is measured in henry (H).

MCQ No. 80

Which law explains the negative sign in Faraday's law?
a. Ohm's law
b. Coulomb's law
c. Lenz's law
d. Kirchhoff's law

Correct answer: c. Lenz's law

Explanation: The negative sign indicates opposition to the change causing induction.

MCQ No. 81

A transformer cannot operate on:
a. Alternating current
b. High-frequency current
c. Direct current
d. Sinusoidal current

Correct answer: c. Direct current

Explanation: DC produces constant magnetic flux, so no emf is induced in the secondary.

MCQ No. 82

A transformer with Ns > Np is called:
a. Step-down transformer
b. Step-up transformer
c. Isolation transformer
d. Current transformer

Correct answer: b. Step-up transformer

Explanation: A larger number of secondary turns increases the output voltage.

MCQ No. 83

The efficiency of an ideal transformer is:
a. 50%
b. 75%
c. 90%
d. 100%

Correct answer: d. 100%

Explanation: An ideal transformer has no energy losses.

MCQ No. 84

Which loss occurs due to heating of transformer windings?
a. Eddy current loss
b. Copper loss
c. Hysteresis loss
d. Magnetic loss

Correct answer: b. Copper loss

Explanation: Copper resistance causes I²R heating losses.

MCQ No. 85

The transformer core is laminated mainly to reduce:
a. Copper loss
b. Leakage flux
c. Eddy current loss
d. Voltage drop

Correct answer: c. Eddy current loss

Explanation: Thin insulated laminations reduce circulating eddy currents.

MCQ No. 86

The transformer core is usually made of:
a. Aluminum
b. Soft iron
c. Copper
d. Brass

Correct answer: b. Soft iron

Explanation: Soft iron provides high permeability and low hysteresis loss.

MCQ No. 87

The primary function of a transformer is:
a. Produce electricity
b. Store electricity
c. Change AC voltage
d. Convert AC into DC

Correct answer: c. Change AC voltage

Explanation: Transformers increase or decrease AC voltage through electromagnetic induction.

MCQ No. 88

The ratio $V_s/V_p$ is equal to:
a. $N_p/N_s$
b. $N_s/N_p$
c. $I_s/I_p$
d. Resistance ratio

Correct answer: b. $N_s/N_p$

Explanation: Voltage ratio equals the turns ratio of the transformer.

MCQ No. 89

If a transformer doubles the voltage, the current approximately becomes:
a. Double
b. Half
c. Four times
d. Unchanged

Correct answer: b. Half

Explanation: In an ideal transformer, power remains constant, so current decreases as voltage increases.

MCQ No. 90

The magnetic flux linking the secondary coil is produced by:
a. Battery
b. Primary current
c. Secondary current only
d. Earth

Correct answer: b. Primary current

Explanation: Alternating current in the primary produces changing magnetic flux.

MCQ No. 91

An electric generator converts:
a. Electrical energy into heat
b. Mechanical energy into electrical energy
c. Electrical energy into mechanical energy
d. Heat into electrical energy

Correct answer: b. Mechanical energy into electrical energy

Explanation: Generators work on electromagnetic induction.

MCQ No. 92

The direction of induced current in a generator is determined by:
a. Fleming's left-hand rule
b. Fleming's right-hand rule
c. Ampere's rule
d. Maxwell's rule

Correct answer: b. Fleming's right-hand rule

Explanation: Fleming's right-hand rule gives the direction of induced current.

MCQ No. 93

In a simple AC generator, the output current is:
a. Constant DC
b. Alternating
c. Zero
d. Pulsating DC

Correct answer: b. Alternating

Explanation: Rotation of the coil reverses the direction of induced emf every half turn.

MCQ No. 94

The frequency of induced AC depends mainly upon:
a. Coil resistance
b. Rotational speed
c. Wire thickness
d. Coil color

Correct answer: b. Rotational speed

Explanation: Faster rotation produces higher AC frequency.

MCQ No. 95

An increase in magnetic field strength in a generator causes:
a. Lower emf
b. Greater induced emf
c. No change
d. Zero current

Correct answer: b. Greater induced emf

Explanation: Stronger magnetic fields increase the rate of change of magnetic flux.

MCQ No. 96

Which device converts mechanical energy into electrical energy using electromagnetic induction?
a. Motor
b. Generator
c. Transformer
d. Capacitor

Correct answer: b. Generator

Explanation: A generator induces emf by rotating a conductor in a magnetic field.

MCQ No. 97

The principle of electromagnetic induction is mainly used in:
a. Electric generators
b. Transformers
c. Induction cookers
d. All of these

Correct answer: d. All of these

Explanation: All these devices operate using electromagnetic induction.

MCQ No. 98

The induced emf is maximum when the rate of change of magnetic flux is:
a. Zero
b. Minimum
c. Maximum
d. Constant

Correct answer: c. Maximum

Explanation: Faster flux change produces greater induced emf.

MCQ No. 99

Faraday's law relates induced emf with:
a. Electric field
b. Magnetic flux
c. Electric charge
d. Electric potential

Correct answer: b. Magnetic flux

Explanation: Induced emf depends on the rate of change of magnetic flux.

MCQ No. 100

Electromagnetic induction forms the working principle of:
a. Transformer
b. Generator
c. Induction furnace
d. All of these

Correct answer: d. All of these

Explanation: Numerous electrical devices—including transformers, generators, and induction furnaces—operate on the principle of electromagnetic induction.

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Electromagnetic Induction – 100 Basic MCQs with Answers & Explanations | Board & MDCAT Preparation

100 Important Basic MCQs (Level -1) on Electromagnetic Induction, Physics (Unit-Wise MCQs Practice):

👉Physics MCQs Hub – Unit wise Physics MCQs Practice (Main-Page)👈

This chapter-wise MCQ collection includes:

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This question bank helps students to:

Electromagnetic Induction MCQs Level 1 – 100 Basic MCQs (1–100)

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