100 Advanced & Numerical MCQs (Level -2) 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 2 – 100 Advanced & Numerical MCQs (MCQs 101–200)

MCQ No. 101

A coil of 200 turns experiences a change in magnetic flux from 0.02 Wb to 0.06 Wb in 0.02 s. The induced emf is:
a. 200 V
b. 300 V
c. 400 V
d. 500 V

Correct answer: c. 400 V

Explanation: $E=N\frac{\Delta\Phi}{\Delta t}=200\times\frac{0.04}{0.02}=400\text{ V}$ .

MCQ No. 102

A magnetic flux of 0.5 Wb through a coil becomes zero in 0.25 s. The average induced emf in a 100-turn coil is:
a. 100 V
b. 150 V
c. 200 V
d. 250 V

Correct answer: c. 200 V

Explanation: $E=100\times\frac{0.5}{0.25}=200\text{ V}$ .

MCQ No. 103

A transformer has 500 turns in the primary and 100 turns in the secondary. If the primary voltage is 220 V, the secondary voltage is:
a. 22 V
b. 44 V
c. 55 V
d. 110 V

Correct answer: b. 44 V

Explanation: $V_s=220\times\frac{100}{500}=44\text{ V}$ .

MCQ No. 104

A transformer has 200 primary turns and 1000 secondary turns. If the input voltage is 120 V, the output voltage is:
a. 300 V
b. 450 V
c. 600 V
d. 720 V

Correct answer: c. 600 V

Explanation: $V_s=120\times\frac{1000}{200}=600\text{ V}$ .

MCQ No. 105

The self-inductance of a coil is 5 H. If the current changes at 4 A/s, the induced emf is:
a. 10 V
b. 15 V
c. 20 V
d. 25 V

Correct answer: c. 20 V

Explanation: $E=L\frac{dI}{dt}=5\times4=20\text{ V}$ .

MCQ No. 106

A 2 H inductor carries a current changing at 8 A/s. The induced emf is:
a. 8 V
b. 12 V
c. 16 V
d. 20 V

Correct answer: c. 16 V

Explanation: $E=2\times8=16\text{ V}$ .

MCQ No. 107

The energy stored in a 4 H inductor carrying 3 A current is:
a. 9 J
b. 12 J
c. 18 J
d. 24 J

Correct answer: c. 18 J

Explanation: $U=\frac12LI^2=\frac12\times4\times9=18\text{ J}$ .

MCQ No. 108

An inductor stores 25 J of energy when the current is 5 A. Its inductance is:
a. 1 H
b. 2 H
c. 4 H
d. 5 H

Correct answer: b. 2 H

Explanation: $L=\frac{2U}{I^2}=\frac{50}{25}=2\text{ H}$ .

MCQ No. 109

The induced emf is 60 V when magnetic flux changes by 0.3 Wb in 0.5 s. The number of turns is:
a. 50
b. 75
c. 100
d. 120

Correct answer: c. 100

Explanation: $N=\frac{E\Delta t}{\Delta\Phi}=\frac{60\times0.5}{0.3}=100$ .

MCQ No. 110

A transformer operates at 90% efficiency. If the input power is 1000 W, the output power is:
a. 800 W
b. 850 W
c. 900 W
d. 950 W

Correct answer: c. 900 W

Explanation: Output power = $0.90\times1000=900\text{ W}$ .

MCQ No. 111

If the magnetic flux through a coil doubles in the same time interval, the induced emf becomes:
a. Half
b. Double
c. Four times
d. Unchanged

Correct answer: b. Double

Explanation: Induced emf is directly proportional to the change in magnetic flux.

MCQ No. 112

A conductor moves twice as fast across a magnetic field. The induced emf becomes:
a. Half
b. Double
c. One-fourth
d. Zero

Correct answer: b. Double

Explanation: Motional emf is directly proportional to velocity.

MCQ No. 113

If the speed of rotation of an AC generator is doubled, the maximum induced emf becomes:
a. Half
b. Double
c. Four times
d. Unchanged

Correct answer: b. Double

Explanation: Induced emf is proportional to angular velocity.

MCQ No. 114

A transformer changes 240 V AC to 24 V AC. It is a:
a. Step-up transformer
b. Step-down transformer
c. Isolation transformer
d. Power generator

Correct answer: b. Step-down transformer

Explanation: The output voltage is lower than the input voltage.

MCQ No. 115

A transformer has 1000 primary turns and 250 secondary turns. The voltage ratio $V_s/V_p$ is:
a. 4
b. 2
c. 0.5
d. 0.25

Correct answer: d. 0.25

Explanation: $V_s/V_p=N_s/N_p=250/1000=0.25$ .

MCQ No. 116

If an ideal transformer increases voltage by 5 times, the current becomes:
a. Five times
b. Half
c. One-fifth
d. Unchanged

Correct answer: c. One-fifth

Explanation: In an ideal transformer, power remains constant.

MCQ No. 117

Which factor does not affect induced emf?
a. Number of turns
b. Rate of change of flux
c. Magnetic field strength
d. Mass of the coil

Correct answer: d. Mass of the coil

Explanation: The coil's mass has no effect on electromagnetic induction.

MCQ No. 118

The induced current always opposes:
a. Magnetic field
b. Electric field
c. Change in magnetic flux
d. Electric charge

Correct answer: c. Change in magnetic flux

Explanation: This is Lenz's law.

MCQ No. 119

The SI unit of magnetic flux is:
a. Tesla
b. Henry
c. Weber
d. Volt

Correct answer: c. Weber

Explanation: Magnetic flux is measured in weber (Wb).

MCQ No. 120

If the number of turns in a transformer is doubled while keeping the turns ratio constant, the output voltage will:
a. Double
b. Half
c. Remain unchanged
d. Become zero

Correct answer: c. Remain unchanged

Explanation: Voltage depends on the turns ratio, not the absolute number of turns.

MCQ No. 121

Which quantity is directly proportional to induced emf?
a. Rate of change of magnetic flux
b. Coil resistance
c. Wire length only
d. Coil temperature

Correct answer: a. Rate of change of magnetic flux

Explanation: Faraday's law states that emf is proportional to the rate of change of magnetic flux.

MCQ No. 122

The principle of electromagnetic induction was discovered by:
a. James Clerk Maxwell
b. Michael Faraday
c. André-Marie Ampère
d. Nikola Tesla

Correct answer: b. Michael Faraday

Explanation: Michael Faraday discovered electromagnetic induction in 1831.

MCQ No. 123

In an ideal transformer:
a. Input power is greater than output power
b. Output power is greater than input power
c. Input power equals output power
d. Current remains constant

Correct answer: c. Input power equals output power

Explanation: An ideal transformer has no energy losses.

MCQ No. 124

Which instrument works primarily on the principle of electromagnetic induction?
a. Electric generator
b. Transformer
c. Induction motor
d. All of these

Correct answer: d. All of these

Explanation: These devices use electromagnetic induction for their operation.

MCQ No. 125

Faraday's law of electromagnetic induction is fundamentally based on:
a. Conservation of charge
b. Conservation of energy
c. Newton's laws
d. Coulomb's law

Correct answer: b. Conservation of energy

Explanation: Lenz's law (represented by the negative sign in Faraday's law) ensures conservation of energy by making the induced current oppose the change that produces it.

MCQ No. 126

A coil of 500 turns experiences a change in magnetic flux of 0.08 Wb in 0.04 s. The induced emf is:
a. 500 V
b. 800 V
c. 1000 V
d. 1200 V

Correct answer: c. 1000 V

Explanation: $E=N\frac{\Delta\Phi}{\Delta t}=500\times\frac{0.08}{0.04}=1000\text{ V}$ .

MCQ No. 127

A transformer has 400 turns in the primary and 800 turns in the secondary. If the primary voltage is 110 V, the secondary voltage is:
a. 110 V
b. 220 V
c. 330 V
d. 440 V

Correct answer: b. 220 V

Explanation: $V_s=V_p\left(\frac{N_s}{N_p}\right)=110\times\frac{800}{400}=220\text{ V}$ .

MCQ No. 128

A 6 H inductor carries a current changing at 5 A/s. The induced emf is:
a. 20 V
b. 25 V
c. 30 V
d. 35 V

Correct answer: c. 30 V

Explanation: $E=L\frac{dI}{dt}=6\times5=30\text{ V}$ .

MCQ No. 129

The energy stored in an 8 H inductor carrying 2 A current is:
a. 8 J
b. 12 J
c. 16 J
d. 20 J

Correct answer: c. 16 J

Explanation: $U=\frac12LI^2=\frac12\times8\times4=16\text{ J}$ .

MCQ No. 130

A transformer has an efficiency of 95%. If the input power is 2000 W, the output power is:
a. 1800 W
b. 1850 W
c. 1900 W
d. 1950 W

Correct answer: c. 1900 W

Explanation: Output power = $0.95\times2000=1900\text{ W}$

MCQ No. 131

If the rate of change of magnetic flux is reduced to one-half, the induced emf becomes:
a. Double
b. Half
c. Four times
d. Unchanged

Correct answer: b. Half

Explanation: Induced emf is directly proportional to the rate of change of magnetic flux.

MCQ No. 132

The induced emf in a rotating coil becomes zero when the coil rotates:
a. Parallel to magnetic field lines
b. Perpendicular to magnetic field lines
c. At maximum speed
d. At minimum speed

Correct answer: a. Parallel to magnetic field lines

Explanation: When there is no change in magnetic flux, the induced emf is zero.

MCQ No. 133

A conductor moving across magnetic field lines generates emf due to:
a. Electrostatic force
b. Electromagnetic induction
c. Gravitational force
d. Nuclear force

Correct answer: b. Electromagnetic induction

Explanation: Motion through a magnetic field changes magnetic flux, inducing emf.

MCQ No. 134

Which factor increases the induced emf in a generator?
a. Decreasing the number of turns
b. Increasing the magnetic field strength
c. Reducing the speed of rotation
d. Using a thinner wire

Correct answer: b. Increasing the magnetic field strength

Explanation: A stronger magnetic field increases the rate of change of magnetic flux.

MCQ No. 135

A transformer with 600 primary turns and 150 secondary turns connected to 240 V AC produces:
a. 30 V
b. 60 V
c. 90 V
d. 120 V

Correct answer: b. 60 V

Explanation: $V_s=240\times\frac{150}{600}=60\text{ V}$ .

MCQ No. 136

A self-induced emf always:
a. Assists the increase in current
b. Opposes the change in current
c. Has no direction
d. Is always positive

Correct answer: b. Opposes the change in current

Explanation: According to Lenz's law, self-induced emf resists changes in current.

MCQ No. 137

Which quantity remains nearly constant in an ideal transformer?
a. Voltage
b. Current
c. Frequency
d. Resistance

Correct answer: c. Frequency

Explanation: Transformers change voltage and current but not the frequency of AC.

MCQ No. 138

The current in the primary of an ideal step-up transformer is 4 A. If the voltage is doubled, the secondary current is:
a. 2 A
b. 4 A
c. 6 A
d. 8 A

Correct answer: a. 2 A

Explanation: Since power remains constant, doubling the voltage halves the current.

MCQ No. 139

Which material is preferred for transformer laminations?
a. Copper
b. Soft iron
c. Silicon steel
d. Aluminum

Correct answer: c. Silicon steel

Explanation: Laminated silicon steel minimizes hysteresis and eddy current losses.

MCQ No. 140

A coil has 250 turns. Magnetic flux changes from 0.10 Wb to 0.02 Wb in 0.05 s. The induced emf is:
a. 200 V
b. 300 V
c. 400 V
d. 500 V

Correct answer: c. 400 V

Explanation: $E=250\times\frac{0.08}{0.05}=400\text{ V}$ .

MCQ No. 141

Increasing the speed of a generator mainly increases:
a. Resistance
b. Induced emf
c. Coil temperature only
d. Core losses only

Correct answer: b. Induced emf

Explanation: Faster rotation increases the rate of change of magnetic flux.

MCQ No. 142

The unit Henry (H) can also be written as:
a. Wb/A
b. T·m
c. V/m
d. A/Wb

Correct answer: a. Wb/A

Explanation: One henry equals one weber per ampere.

MCQ No. 143

Which device works on the principle of self-induction?
a. Choke coil
b. Transformer
c. Electric bell
d. Ammeter

Correct answer: a. Choke coil

Explanation: A choke coil uses self-induction to oppose changes in alternating current.

MCQ No. 144

A 10 H inductor carries 4 A current. The stored energy is:
a. 40 J
b. 60 J
c. 80 J
d. 100 J

Correct answer: c. 80 J

Explanation: $U=\frac12\times10\times4^2=80\text{ J}$ .

MCQ No. 145

If the magnetic field becomes zero while the conductor is stationary, the induced emf will be:
a. Maximum
b. Minimum
c. Zero
d. Infinite

Correct answer: c. Zero

Explanation: Without a changing magnetic flux, no emf is induced.

MCQ No. 146

An ideal transformer has an input voltage of 100 V and output voltage of 400 V. The turns ratio is:
a. 1:2
b. 2:1
c. 1:4
d. 4:1

Correct answer: c. 1:4

Explanation: $N_p:N_s=V_p:V_s=100:400=1:4$

MCQ No. 147

Which law is applied to determine the direction of induced current in generators?
a. Fleming's Left-Hand Rule
b. Fleming's Right-Hand Rule
c. Right-Hand Thumb Rule
d. Maxwell's Rule

Correct answer: b. Fleming's Right-Hand Rule

Explanation: Fleming's Right-Hand Rule determines the direction of induced current.

MCQ No. 148

The main cause of hysteresis loss is:
a. Heating of windings
b. Continuous magnetization and demagnetization of the core
c. Leakage current
d. Air resistance

Correct answer: b. Continuous magnetization and demagnetization of the core

Explanation: Repeated reversal of magnetization causes hysteresis loss.

MCQ No. 149

The induced emf in a conductor becomes zero if the conductor moves:
a. Perpendicular to the magnetic field
b. Parallel to the magnetic field
c. In a circular path
d. With increasing speed

Correct answer: b. Parallel to the magnetic field

Explanation: No magnetic field lines are cut when the conductor moves parallel to the field.

MCQ No. 150

Electromagnetic induction is widely used in:
a. Electric power generation
b. Power transmission
c. Electrical appliances such as transformers and induction cookers
d. All of these

Correct answer: d. All of these

Explanation: Electromagnetic induction is one of the most important principles in electrical engineering and is used in generators, transformers, induction motors, induction cookers, and electric power systems.

MCQ No. 151

A coil of 400 turns experiences a change in magnetic flux of 0.15 Wb in 0.03 s. The induced emf is:
a. 1000 V
b. 1500 V
c. 2000 V
d. 2500 V

Correct answer: c. 2000 V

Explanation: $E=N\frac{\Delta\Phi}{\Delta t}=400\times\frac{0.15}{0.03}=2000\text{ V}$ .

MCQ No. 152

A transformer has 1000 turns in the primary and 200 turns in the secondary. If the input voltage is 250 V, the output voltage is:
a. 25 V
b. 50 V
c. 75 V
d. 100 V

Correct answer: b. 50 V

Explanation: $V_s=250\times\frac{200}{1000}=50\text{ V}$ .

MCQ No. 153

The self-induced emf in a coil is 48 V when the current changes at 12 A/s. The inductance of the coil is:
a. 2 H
b. 3 H
c. 4 H
d. 5 H

Correct answer: c. 4 H

Explanation: $L=\frac{E}{dI/dt}=\frac{48}{12}=4\text{ H}$ .

MCQ No. 154

The energy stored in a 12 H inductor carrying 5 A current is:
a. 100 J
b. 125 J
c. 150 J
d. 200 J

Correct answer: c. 150 J

Explanation: $U=\frac12LI^2=\frac12\times12\times25=150\text{ J}$ .

MCQ No. 155

A transformer has an efficiency of 96%. If the input power is 2500 W, the output power is:
a. 2300 W
b. 2350 W
c. 2400 W
d. 2450 W

Correct answer: c. 2400 W

Explanation: Output power = $0.96\times2500=2400\text{ W}$ .

MCQ No. 156

If the magnetic flux through a coil changes three times faster, the induced emf will become:
a. One-third
b. Three times
c. Six times
d. Unchanged

Correct answer: b. Three times

Explanation: Induced emf is directly proportional to the rate of change of magnetic flux.

MCQ No. 157

The induced current produced in a closed circuit always creates a magnetic field that:
a. Supports the change in flux
b. Opposes the change in flux
c. Eliminates the magnetic field
d. Has no effect

Correct answer: b. Opposes the change in flux

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

MCQ No. 158

The frequency of an AC generator depends mainly upon:
a. Number of turns only
b. Speed of rotation
c. Resistance of the coil
d. Thickness of wire

Correct answer: b. Speed of rotation

Explanation: Increasing rotational speed increases the frequency of alternating current.

MCQ No. 159

If both the magnetic field strength and rotational speed are doubled, the induced emf becomes:
a. Double
b. Triple
c. Four times
d. Eight times

Correct answer: c. Four times

Explanation: Induced emf is proportional to both magnetic field strength and speed.

MCQ No. 160

A transformer changes 1000 V to 100 V. The transformer is:
a. Step-up
b. Step-down
c. Isolation
d. Auto-transformer

Correct answer: b. Step-down

Explanation: The output voltage is lower than the input voltage.

MCQ No. 161

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

Correct answer: c. Henry

Explanation: Self-inductance is measured in henry (H).

MCQ No. 162

The direction of induced emf is determined by:
a. Newton's law
b. Lenz's law
c. Coulomb's law
d. Snell's law

Correct answer: b. Lenz's law

Explanation: Lenz's law determines the direction of induced emf.

MCQ No. 163

Which device converts electrical energy into mechanical energy?
a. Transformer
b. Generator
c. Electric motor
d. Induction coil

Correct answer: c. Electric motor

Explanation: Electric motors convert electrical energy into mechanical energy using magnetic forces.

MCQ No. 164

A transformer core is laminated to reduce:
a. Hysteresis loss
b. Copper loss
c. Eddy current loss
d. Leakage flux

Correct answer: c. Eddy current loss

Explanation: Laminations increase resistance to circulating eddy currents.

MCQ No. 165

A conductor moving perpendicular to magnetic field lines experiences:
a. Maximum induced emf
b. Zero induced emf
c. Constant resistance
d. Minimum current

Correct answer: a. Maximum induced emf

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

MCQ No. 166

A 5 H inductor carries 6 A current. The stored energy is:
a. 45 J
b. 60 J
c. 90 J
d. 120 J

Correct answer: c. 90 J

Explanation: $U=\frac12\times5\times6^2=\frac12\times5\times36=90\text{ J}$ .

MCQ No. 167

If the number of turns in a generator is doubled while all other factors remain constant, the induced emf:
a. Becomes half
b. Remains unchanged
c. Doubles
d. Quadruples

Correct answer: c. Doubles

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

MCQ No. 168

The phenomenon of self-induction occurs because of:
a. Changing electric field
b. Changing current in the same coil
c. Constant magnetic field
d. Stationary conductor

Correct answer: b. Changing current in the same coil

Explanation: A changing current produces a changing magnetic field that induces emf in the same coil.

MCQ No. 169

An ideal transformer has an input power of 600 W. The output power is:
a. 500 W
b. 550 W
c. 600 W
d. 650 W

Correct answer: c. 600 W

Explanation: An ideal transformer has no energy losses.

MCQ No. 170

Which of the following increases the efficiency of a transformer?
a. Laminated silicon steel core
b. Thick wooden core
c. Plastic core
d. Increasing resistance of windings

Correct answer: a. Laminated silicon steel core

Explanation: Silicon steel reduces hysteresis and eddy current losses.

MCQ No. 171

A transformer has 300 primary turns and 900 secondary turns. If the primary voltage is 80 V, the secondary voltage is:
a. 160 V
b. 200 V
c. 240 V
d. 320 V

Correct answer: c. 240 V

Explanation: $V_s=80\times\frac{900}{300}=240\text{ V}$ .

MCQ No. 172

The negative sign in Faraday's law represents:
a. Power loss
b. Resistance
c. Lenz's law
d. Voltage drop

Correct answer: c. Lenz's law

Explanation: The negative sign indicates that the induced emf opposes the change producing it.

MCQ No. 173

If the magnetic flux through a coil remains unchanged, the induced current is:
a. Maximum
b. Minimum
c. Zero
d. Infinite

Correct answer: c. Zero

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

MCQ No. 174

Which of the following is not a loss in a transformer?
a. Copper loss
b. Hysteresis loss
c. Eddy current loss
d. Electrostatic loss

Correct answer: d. Electrostatic loss

Explanation: The main transformer losses are copper loss, hysteresis loss, and eddy current loss.

MCQ No. 175

Electromagnetic induction is based primarily on:
a. Static electric charges
b. Changing magnetic flux
c. Constant magnetic field
d. Gravitational field

Correct answer: b. Changing magnetic flux

Explanation: Electromagnetic induction occurs whenever the magnetic flux linked with a conductor changes, producing an induced emf according to Faraday's law.

MCQ No. 176

The direction of induced current is always such that it:
a. Increases the magnetic flux
b. Opposes the change producing it
c. Is parallel to the magnetic field
d. Has no fixed direction

Correct answer: b. Opposes the change producing it

Explanation: According to Lenz's law, the induced current always opposes the change in magnetic flux responsible for its production.

MCQ No. 177

The magnetic flux linked with a coil changes from 0.6 Wb to 0.2 Wb in 0.1 s. The average induced emf is:
a. 2 V
b. 4 V
c. 6 V
d. 8 V

Correct answer: b. 4 V

Explanation: $E=\frac{\Delta\Phi}{\Delta t}=\frac{0.4}{0.1}=4\text{ V}$ .

MCQ No. 178

The SI unit of magnetic flux is:
a. Weber
b. Tesla
c. Henry
d. Volt

Correct answer: a. Weber

Explanation: Magnetic flux is measured in weber (Wb).

MCQ No. 179

A transformer can operate only with:
a. DC
b. AC
c. Both AC and DC
d. Pulsed DC only

Correct answer: b. AC

Explanation: Alternating current continuously changes magnetic flux, inducing emf in the secondary coil.

MCQ No. 180

If the frequency of AC is doubled, the inductive reactance becomes:
a. Half
b. Double
c. Four times
d. Unchanged

Correct answer: b. Double

Explanation: $X_L=2\pi fL$ . Reactance is directly proportional to frequency.

MCQ No. 181

The phase difference between current and voltage in a pure capacitor is:
a. 0°
b. 90° (current leads)
c. 90° (voltage leads)
d. 180°

Correct answer: b. 90° (current leads)

Explanation: In a capacitive circuit, current leads voltage by 90°.

MCQ No. 182

The phase difference in a purely resistive circuit is:
a. 90°
b. 180°
c. 0°
d. 45°

Correct answer: c. 0°

Explanation: Voltage and current remain in phase in a resistor.

MCQ No. 183

The phase difference in a pure inductor is:
a. Current leads by 90°
b. Voltage leads by 90°
c. Both are in phase
d. 180°

Correct answer: b. Voltage leads by 90°

Explanation: In an inductive circuit, current lags voltage by 90°.

MCQ No. 184

The quantity $XL-XC$ is called:
a. Resistance
b. Impedance
c. Net reactance
d. Power factor

Correct answer: c. Net reactance

Explanation: The difference between inductive and capacitive reactance gives the resultant reactance.

MCQ No. 185

Power factor is equal to:
a. sinφ
b. tanφ
c. cosφ
d. secφ

Correct answer: c. cosφ

Explanation: Power factor is the cosine of the phase angle between voltage and current.

MCQ No. 186

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. 187

A transformer with fewer turns in the secondary than in the primary is:
a. Step-up transformer
b. Step-down transformer
c. Isolation transformer
d. Current transformer

Correct answer: b. Step-down transformer

Explanation: Fewer secondary turns reduce the output voltage.

MCQ No. 188

If the primary voltage is doubled while turns ratio remains unchanged, secondary voltage becomes:
a. Half
b. Double
c. Four times
d. Unchanged

Correct answer: b. Double

Explanation: Secondary voltage is directly proportional to primary voltage.

MCQ No. 189

Which law gives the magnitude of induced emf?
a. Coulomb's law
b. Faraday's law
c. Ampere's law
d. Ohm's law

Correct answer: b. Faraday's law

Explanation: Faraday's law states that induced emf equals the rate of change of magnetic flux.

MCQ No. 190

The negative sign in Faraday's law represents:
a. Voltage gain
b. Current gain
c. Lenz's law
d. Resistance

Correct answer: c. Lenz's law

Explanation: The negative sign indicates opposition to the change in magnetic flux.

MCQ No. 191

Increasing the speed of rotation of a generator will:
a. Decrease emf
b. Increase emf
c. Keep emf constant
d. Stop induction

Correct answer: b. Increase emf

Explanation: Faster rotation increases the rate of change of magnetic flux.

MCQ No. 192

The induced emf is maximum when the conductor cuts magnetic field lines:
a. Parallel
b. Perpendicular
c. At 30°
d. At 45°

Correct answer: b. Perpendicular

Explanation: Maximum flux cutting occurs at 90°.

MCQ No. 193

The device used to convert AC into DC is:
a. Generator
b. Transformer
c. Rectifier
d. Oscillator

Correct answer: c. Rectifier

Explanation: Rectifiers convert alternating current into direct current.

MCQ No. 194

A moving magnet induces current because it changes:
a. Resistance
b. Voltage
c. Magnetic flux
d. Charge

Correct answer: c. Magnetic flux

Explanation: Induced emf depends on changing magnetic flux through the coil.

MCQ No. 195

The commercial frequency of AC supply in Pakistan is:
a. 25 Hz
b. 40 Hz
c. 50 Hz
d. 60 Hz

Correct answer: c. 50 Hz

Explanation: Pakistan's national AC supply operates at 50 Hz.

MCQ No. 196

The time period of 50 Hz AC is:
a. 0.01 s
b. 0.02 s
c. 0.05 s
d. 0.1 s

Correct answer: b. 0.02 s

Explanation: $T=\frac{1}{f}=\frac{1}{50}=0.02\text{ s}$ .

MCQ No. 197

The rms value of AC is the value that produces:
a. Greater heating than DC
b. The same heating effect as DC
c. No heating effect
d. Infinite heating

Correct answer: b. The same heating effect as DC

Explanation: RMS value is defined based on the equivalent heating effect.

MCQ No. 198

If the peak voltage is 311 V, the rms voltage is approximately:
a. 110 V
b. 155 V
c. 220 V
d. 311 V

Correct answer: c. 220 V

Explanation: $V_{rms}=\frac{311}{\sqrt2}\approx220\text{ V}$

MCQ No. 199

Which of the following is not based on electromagnetic induction?
a. Electric generator
b. Transformer
c. Induction cooker
d. Electric heater

Correct answer: d. Electric heater

Explanation: An electric heater works on the heating effect of electric current, not electromagnetic induction.

MCQ No. 200

Electromagnetic induction is the phenomenon of:
a. Producing magnetic field by current
b. Producing current by changing magnetic flux
c. Producing charge by friction
d. Producing voltage by chemical reaction

Correct answer: b. Producing current by changing magnetic flux

Explanation: Electromagnetic induction is the production of emf (and current in a closed circuit) due to a change in magnetic flux, as explained by Faraday's law.

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Electromagnetic Induction – 100 Advanced & Numerical with Answers & Explanations | Board & MDCAT Preparation

100 Advanced & Numerical MCQs (Level -2) on Electromagnetic Induction, Physics (Unit-Wise MCQs Practice):

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Electromagnetic Induction MCQs Level 2 – 100 Advanced & Numerical MCQs (MCQs 101–200)

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