1.
The SI unit of magnetic flux is: A) Tesla B) Weber C) Henry D) Ampere
2.
The SI unit of magnetic field strength is: A) Tesla B) Weber C) Henry D) Coulomb
3.
A freely suspended magnet always points towards: A) East-West B) North-South C) Up-Down D) Northwest-Southeast
4.
Like magnetic poles: A) Attract B) Repel C) Neutralize D) Rotate
5.
Unlike magnetic poles: A) Repel B) Attract C) Destroy each other D) Produce heat
6.
The region around a magnet where magnetic effects are experienced is called: A) Electric field B) Gravitational field C) Magnetic field D) Force field
7.
The magnetic field lines emerge from: A) South pole B) North pole C) Center D) Equator
8.
Inside a magnet, magnetic field lines travel from: A) North to South B) South to North C) East to West D) West to East
9.
Magnetic field lines never: A) Bend B) Curve C) Intersect D) Expand
10.
The Earth behaves like a giant: A) Capacitor B) Electromagnet C) Permanent magnet D) Generator
11.
The material strongly attracted by a magnet is: A) Wood B) Plastic C) Iron D) Glass
12.
The magnetic field around a straight current-carrying conductor is: A) Circular B) Linear C) Elliptical D) Random
13.
The direction of magnetic field around a conductor is determined by: A) Fleming’s Left-Hand Rule B) Fleming’s Right-Hand Rule C) Right-Hand Thumb Rule D) Lenz’s Law
14.
The strength of magnetic field around a conductor increases with: A) Distance B) Resistance C) Current D) Voltage only
15.
The magnetic field at the center of a circular loop is proportional to: A) Radius B) Current C) Resistance D) Length
16.
A solenoid produces a magnetic field similar to: A) Capacitor B) Bar magnet C) Battery D) Resistor
17.
The core of an electromagnet is usually made of: A) Copper B) Steel C) Soft iron D) Aluminum
18.
An electromagnet can be strengthened by: A) Reducing turns B) Reducing current C) Increasing turns D) Removing core
19.
The magnetic effect of electric current was discovered by: A) Faraday B) Ampere C) Oersted D) Maxwell
20.
The force on a moving charge in a magnetic field is maximum when the motion is: A) Parallel B) Antiparallel C) Perpendicular D) Stationary
21.
The force on a stationary charge in a magnetic field is: A) Maximum B) Minimum C) Zero D) Infinite
22.
The direction of force on a current-carrying conductor is given by: A) Lenz’s Law B) Fleming’s Left-Hand Rule C) Right-Hand Rule D) Kirchhoff’s Law
23.
A motor converts: A) Mechanical energy into electrical energy B) Electrical energy into mechanical energy C) Heat into electrical energy D) Light into electrical energy
24.
An electric generator converts: A) Mechanical energy into electrical energy B) Electrical energy into heat C) Electrical energy into mechanical energy D) Heat into mechanical energy
25.
The principle of generator is: A) Electrolysis B) Electromagnetic induction C) Magnetic attraction D) Coulomb force
26.
Electromagnetic induction was discovered by: A) Oersted B) Ampere C) Faraday D) Newton
27.
The induced emf depends upon: A) Change in magnetic flux B) Resistance only C) Voltage only D) Length only
28.
Faraday’s law relates induced emf to: A) Electric field B) Magnetic flux change C) Current D) Resistance
29.
The SI unit of inductance is: A) Weber B) Tesla C) Henry D) Volt
30.
Lenz’s law is based on the law of conservation of: A) Mass B) Charge C) Energy D) Momentum
31.
The induced current opposes: A) Current B) Resistance C) Change producing it D) Voltage
32.
A transformer works on: A) Electrostatic induction B) Electromagnetic induction C) Conduction D) Radiation
33.
A transformer can operate on: A) DC only B) AC only C) Both AC and DC equally D) Static charge
34.
A step-up transformer increases: A) Current B) Voltage C) Resistance D) Power
35.
A step-down transformer decreases: A) Voltage B) Resistance C) Frequency D) Power
36.
The core of a transformer is made of: A) Laminated soft iron B) Copper C) Aluminum D) Plastic
37.
Magnetic flux is represented by: A) B B) Φ C) E D) H
38.
The unit Tesla is equal to: A) Wb/m² B) Wb·m² C) A/m D) N/m
39.
The magnetic field inside a long solenoid is: A) Non-uniform B) Zero C) Uniform D) Random
40.
The force between two parallel currents was studied by: A) Ampere B) Faraday C) Oersted D) Volta
41.
Parallel currents flowing in the same direction: A) Repel B) Attract C) Produce no force D) Oscillate
42.
Parallel currents flowing in opposite directions: A) Attract B) Repel C) Neutralize D) Merge
43.
The magnetic permeability of vacuum is: A) μ₀ B) ε₀ C) λ D) σ
44.
The Earth’s magnetic north pole lies near: A) Geographic north B) Geographic south C) Equator D) Tropic of Cancer
45.
The tangent galvanometer works on: A) Magnetic effect of current B) Heating effect C) Chemical effect D) Photoelectric effect
46.
The torque on a current loop is maximum when its plane is: A) Parallel to field B) Perpendicular to field C) At 45° D) Zero
47.
A galvanometer can be converted into an ammeter by connecting: A) High resistance in series B) Low resistance in parallel C) Capacitor D) Inductor
48.
A galvanometer can be converted into a voltmeter by connecting: A) High resistance in series B) Low resistance in parallel C) Capacitor D) Coil
49.
The magnetic field due to a straight conductor decreases with: A) Current B) Radius C) Distance D) Voltage
50.
The magnetic force on a conductor depends on: A) Current B) Magnetic field C) Length D) All of these
51.
The symbol for magnetic field is: A) B B) E C) V D) R
52.
The magnetic field is strongest at: A) Center B) Poles C) Sides D) Equator
53.
A magnetic compass contains: A) Soft iron needle B) Magnetized needle C) Copper needle D) Aluminum needle
54.
Diamagnetic substances are: A) Strongly attracted B) Weakly repelled C) Strongly repelled D) Neutral
55.
Paramagnetic substances are: A) Weakly attracted B) Strongly attracted C) Repelled D) Neutral
56.
Ferromagnetic substances are: A) Weakly attracted B) Strongly attracted C) Weakly repelled D) Neutral
57.
Steel is commonly used for: A) Electromagnets B) Permanent magnets C) Resistors D) Capacitors
58.
Soft iron is preferred for electromagnets because: A) High retentivity B) Low permeability C) Easily magnetized and demagnetized D) High resistance
59.
The phenomenon of induced current is called: A) Polarization B) Electromagnetic induction C) Magnetostriction D) Ionization
60.
The direction of induced current is given by: A) Ohm’s Law B) Lenz’s Law C) Coulomb’s Law D) Hooke’s Law
61.
The magnetic field around a solenoid resembles: A) Circular loop B) Bar magnet C) Capacitor D) Battery
62.
Magnetic field lines are denser where field is: A) Weak B) Strong C) Zero D) Constant
63.
The force on a charge moving parallel to a magnetic field is: A) Maximum B) Minimum C) Zero D) Infinite
64.
The SI unit of magnetic dipole moment is: A) A·m² B) Tesla C) Weber D) Volt
65.
A magnetic dipole consists of: A) Single pole B) Two unlike poles C) Two like poles D) Neutral poles
66.
The magnetic field due to a current is measured in: A) Volt B) Tesla C) Joule D) Ohm
67.
An induced emf exists only when: A) Flux changes B) Current is constant C) Resistance changes D) Voltage is fixed
68.
Eddy currents are produced due to: A) Magnetic induction B) Heat C) Friction D) Radiation
69.
Laminated cores reduce: A) Resistance B) Voltage C) Eddy currents D) Flux
70.
The unit of magnetic moment is: A) A·m² B) Tesla C) Weber D) Henry
71.
Magnetic susceptibility measures: A) Resistance B) Magnetization ability C) Voltage D) Charge
72.
The Earth’s magnetic field protects us from: A) Rain B) Solar wind C) Gravity D) Sound
73.
The torque on a current loop becomes zero when: A) Plane parallel to field B) Plane perpendicular to field C) Current zero only D) Radius zero
74.
A DC motor uses: A) Split-ring commutator B) Slip rings C) Transformer D) Capacitor
75.
An AC generator uses: A) Split ring B) Slip rings C) Resistor D) Battery
76.
The induced emf is directly proportional to: A) Rate of flux change B) Resistance C) Current D) Length
77.
The magnetic field inside a toroid is: A) Uniform B) Zero C) Infinite D) Random
78.
Magnetic flux density is another name for: A) B B) E C) I D) V
79.
A transformer cannot change: A) Voltage B) Current C) Frequency D) Power level
80.
The field lines of a magnet form: A) Open curves B) Closed loops C) Straight lines D) Spirals
81.
The force on a conductor is maximum when angle between B and I is: A) 0° B) 30° C) 90° D) 180°
82.
The magnetic effect of current is strongest in: A) Straight wire B) Circular loop C) Solenoid D) None
83.
The magnetic field at the center of a coil increases with: A) Number of turns B) Radius only C) Resistance D) Voltage
84.
The north-seeking end of a magnet is called: A) South pole B) Neutral point C) North pole D) Equator
85.
Magnetic poles always exist: A) Separately B) In pairs C) Alone D) Randomly
86.
The SI unit of magnetomotive force is: A) Ampere-turn B) Tesla C) Weber D) Henry
87.
An electromagnet loses magnetism when: A) Current stops B) Current increases C) Voltage increases D) Resistance decreases
88.
The magnetic field due to a solenoid depends on: A) Current B) Turns per unit length C) Core material D) All of these
89.
The Lorentz force acts on: A) Moving charge B) Stationary charge C) Neutral particle only D) Photon
90.
The direction of induced emf opposes: A) Flux B) Resistance C) Cause producing it D) Voltage source
91.
Mutual induction occurs between: A) Two coils B) Two batteries C) Two resistors D) Two capacitors
92.
Self-induction occurs in: A) Same coil B) Different coil C) Battery D) Capacitor
93.
The unit of self-inductance is: A) Weber B) Tesla C) Henry D) Volt
94.
An ideal transformer has efficiency: A) 50% B) 75% C) 90% D) 100%
95.
The magnetic field due to a long straight wire varies as: A) r B) r² C) 1/r D) 1/r²
96.
A magnetic domain theory explains: A) Ferromagnetism B) Electrolysis C) Gravitation D) Refraction
97.
The permeability of vacuum is approximately: A) 4π × 10⁻⁷ H/m B) 8.85 × 10⁻¹² C) 3 × 10⁸ D) 6.67 × 10⁻¹¹
98.
The induced emf in a conductor moving through a magnetic field is called: A) Static emf B) Motional emf C) Thermal emf D) Chemical emf
99.
The working principle of an electric bell is: A) Permanent magnetism B) Electromagnetism C) Electrolysis D) Radiation
100.
Maxwell is best known for formulating: A) Laws of motion B) Laws of thermodynamics C) Electromagnetic theory D) Laws of gravitation
Answer Key
1-B, 2-A, 3-B, 4-B, 5-B, 6-C, 7-B, 8-B, 9-C, 10-C
11-C, 12-A, 13-C, 14-C, 15-B, 16-B, 17-C, 18-C, 19-C, 20-C
21-C, 22-B, 23-B, 24-A, 25-B, 26-C, 27-A, 28-B, 29-C, 30-C
31-C, 32-B, 33-B, 34-B, 35-A, 36-A, 37-B, 38-A, 39-C, 40-A
41-B, 42-B, 43-A, 44-B, 45-A, 46-A, 47-B, 48-A, 49-C, 50-D
51-A, 52-B, 53-B, 54-B, 55-A, 56-B, 57-B, 58-C, 59-B, 60-B
61-B, 62-B, 63-C, 64-A, 65-B, 66-B, 67-A, 68-A, 69-C, 70-A
71-B, 72-B, 73-B, 74-A, 75-B, 76-A, 77-A, 78-A, 79-C, 80-B
81-C, 82-C, 83-A, 84-C, 85-B, 86-A, 87-A, 88-D, 89-A, 90-C
91-A, 92-A, 93-C, 94-D, 95-C, 96-A, 97-A, 98-B, 99-B, 100-C