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Magnetism and Electromagnetism MCQs with Answers

Magnetism and Electromagnetism MCQs

Welcome to the Magnetism and Electromagnetism MCQs with Answers. In this post, we are sharing Magnetism and Electromagnetism Multiple Choice Questions and Answers in Everyday Science section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Magnetism and Electromagnetism online MCQs Test.

What is the unit of magnetic flux?
a) Tesla
b) Weber
c) Ampere
d) Henry

Answer
b) Weber

Which material is commonly used to make permanent magnets?
a) Iron
b) Aluminum
c) Copper
d) Silver

Answer
a) Iron

What is the direction of the magnetic field lines around a current-carrying conductor?
a) From south to north
b) From north to south
c) In circular loops around the conductor
d) In straight lines along the conductor

Answer
c) In circular loops around the conductor

What happens to the magnetic field inside a solenoid when the current through it increases?
a) It decreases
b) It remains the same
c) It increases
d) It reverses direction

Answer
c) It increases

Which law states that the induced electromotive force (EMF) in a circuit is proportional to the rate of change of the magnetic flux through the circuit?
a) Faraday’s Law
b) Ohm’s Law
c) Ampere’s Law
d) Lenz’s Law

Answer
a) Faraday’s Law

What is the effect of placing a magnetic material inside a coil of wire carrying a current?
a) It decreases the magnetic field strength
b) It has no effect
c) It increases the magnetic field strength
d) It reverses the magnetic field direction

Answer
c) It increases the magnetic field strength

What type of magnetism is exhibited by materials that can be magnetized but do not retain their magnetism when the external field is removed?
a) Ferromagnetism
b) Paramagnetism
c) Diamagnetism
d) Antiferromagnetism

Answer
b) Paramagnetism

What is the term for a material that creates a magnetic field in response to an applied electric current?
a) Magnetic flux
b) Magnetic dipole
c) Electromagnet
d) Permanent magnet

Answer
c) Electromagnet

Which of the following factors affects the strength of an electromagnet?
a) Number of coils
b) Type of wire
c) Magnetic field of the Earth
d) Shape of the magnet

Answer
a) Number of coils

What does the right-hand rule for a current-carrying wire determine?
a) The direction of the magnetic field
b) The magnitude of the current
c) The direction of the electric field
d) The rate of change of flux

Answer
a) The direction of the magnetic field

Which law describes the force between two current-carrying conductors?
a) Ohm’s Law
b) Coulomb’s Law
c) Ampere’s Law
d) Faraday’s Law

Answer
c) Ampere’s Law

What is the relationship between electric current and magnetic field in a solenoid?
a) Directly proportional
b) Inversely proportional
c) No relation
d) Exponentially proportional

Answer
a) Directly proportional

Which of the following materials is commonly used as a core in transformers to enhance magnetic flux?
a) Iron
b) Copper
c) Aluminum
d) Plastic

Answer
a) Iron

What phenomenon occurs when a magnetic field is used to generate an electric current?
a) Electromagnetic induction
b) Magnetic resonance
c) Magnetic flux
d) Magnetic polarization

Answer
a) Electromagnetic induction

Which type of current is generated by an alternator?
a) Direct current
b) Alternating current
c) Pulsating current
d) Static current

Answer
b) Alternating current

In which direction do magnetic field lines point inside a magnet?
a) From north to south
b) From south to north
c) In circular loops around the magnet
d) From the center outwards

Answer
b) From south to north

What is the name of the force experienced by a charged particle moving through a magnetic field?
a) Lorentz force
b) Coulomb force
c) Gravitational force
d) Centripetal force

Answer
a) Lorentz force

Which instrument is used to measure the strength of a magnetic field?
a) Ammeter
b) Voltmeter
c) Gaussmeter
d) Thermometer

Answer
c) Gaussmeter

What type of magnetism is exhibited by materials like bismuth and graphite?
a) Paramagnetism
b) Ferromagnetism
c) Diamagnetism
d) Antiferromagnetism

Answer
c) Diamagnetism

Which of the following best describes the magnetic field of a bar magnet?
a) Uniform
b) Irregular
c) Circular
d) Radial

Answer
b) Irregular

What is the primary factor that determines the strength of a magnetic field in a solenoid?
a) Current through the solenoid
b) Temperature of the solenoid
c) Length of the solenoid
d) Material of the solenoid

Answer
a) Current through the solenoid

What is the effect of increasing the number of turns in a solenoid?
a) It decreases the magnetic field strength
b) It increases the magnetic field strength
c) It has no effect
d) It reverses the magnetic field direction

Answer
b) It increases the magnetic field strength

Which of the following materials is used to create a magnetic field in a magnetron?
a) Steel
b) Aluminum
c) Iron
d) Nickel

Answer
c) Iron

What does the term “magnetic flux” refer to?
a) The number of magnetic field lines passing through a surface
b) The strength of the magnetic field
c) The direction of the magnetic field
d) The speed of a magnetic field change

Answer
a) The number of magnetic field lines passing through a surface

What is the primary function of a magnetic compass?
a) To measure the strength of a magnetic field
b) To indicate the direction of the Earth’s magnetic field
c) To generate a magnetic field
d) To measure electric current

Answer
b) To indicate the direction of the Earth’s magnetic field

What is the principle behind the operation of an electric motor?
a) Electromagnetic induction
b) Magnetic repulsion
c) Magnetic attraction
d) Lorentz force

Answer
d) Lorentz force

Which of the following is a property of ferromagnetic materials?
a) They cannot be magnetized
b) They retain their magnetism after the external field is removed
c) They are repelled by magnets
d) They have weak magnetic properties

Answer
b) They retain their magnetism after the external field is removed

In which direction do magnetic field lines point outside a magnet?
a) From south to north
b) From north to south
c) In a circular path
d) From the center to the edge

Answer
b) From north to south

What effect does a magnetic field have on a charged particle moving perpendicular to it?
a) It increases the speed of the particle
b) It decreases the speed of the particle
c) It changes the direction of the particle’s motion
d) It has no effect on the particle

Answer
c) It changes the direction of the particle’s motion

What phenomenon occurs when an electric current produces a magnetic field?
a) Electromagnetic induction
b) Magnetic resonance
c) Ampere’s effect
d) Faraday’s effect

Answer
c) Ampere’s effect

Which device uses the principle of electromagnetic induction to generate electrical energy?
a) Transformer
b) Motor
c) Generator
d) Capacitor

Answer
c) Generator

What is the primary function of a transformer in an electrical circuit?
a) To increase or decrease voltage
b) To generate electrical energy
c) To measure magnetic flux
d) To store electrical energy

Answer
a) To increase or decrease voltage

What happens to the magnetic field strength of a solenoid if the core material is replaced with a non-magnetic material?
a) It increases
b) It decreases
c) It remains the same
d) It becomes erratic

Answer
b) It decreases

Which device uses a moving coil to measure magnetic fields?
a) Galvanometer
b) Thermometer
c) Voltmeter
d) Ammeter

Answer
a) Galvanometer

What does the term “Lenz’s Law” describe?
a) The direction of induced EMF
b) The strength of magnetic fields
c) The rate of magnetic field change
d) The force between magnetic poles

Answer
a) The direction of induced EMF

What type of electromagnetic wave is used in radio communication?
a) Infrared
b) Microwaves
c) X-rays
d) Radio waves

Answer
d) Radio waves

Which principle explains the operation of a magnetic resonance imaging (MRI) machine?
a) Electromagnetic induction
b) Magnetic resonance
c) Faraday’s Law
d) Ampere’s Law

Answer
b) Magnetic resonance

What is the primary cause of Earth’s magnetic field?
a) The movement of molten iron in the outer core
b) The rotation of the Earth
c) The presence of iron deposits
d) Solar winds

Answer
a) The movement of molten iron in the outer core

Which device converts electrical energy into mechanical energy using magnetic fields?
a) Transformer
b) Generator
c) Motor
d) Battery

Answer
c) Motor

What type of current is generated by a battery?
a) Alternating current
b) Direct current
c) Pulsating current
d) Static current

Answer
b) Direct current

Which principle is used in the operation of a dynamo?
a) Electromagnetic induction
b) Magnetic resonance
c) Faraday’s Law
d) Lenz’s Law

Answer
a) Electromagnetic induction

What happens to the magnetic field strength if the current in an electromagnet is increased?
a) It decreases
b) It remains the same
c) It increases
d) It reverses direction

Answer
c) It increases

Which of the following materials would be a good core material for an electromagnet?
a) Iron
b) Wood
c) Plastic
d) Glass

Answer
a) Iron

What is the primary effect of an electric current passing through a conductor in a magnetic field?
a) It generates a force on the conductor
b) It changes the conductor’s temperature
c) It decreases the magnetic field strength
d) It creates an electric field

Answer
a) It generates a force on the conductor

Which of the following is not a characteristic of ferromagnetic materials?
a) High magnetic permeability
b) Ability to retain magnetization
c) Magnetic fields are temporary
d) Alignment of magnetic domains

Answer
c) Magnetic fields are temporary

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