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12th Class Physics Chapter 14 MCQs with Answers

12th Class Physics Chapter 14 MCQs

Dive into Electromagnetism with 12th Class Physics Chapter 14 MCQs. Study magnetic fields, electromagnetic forces, and applications in technology. Trending keywords like electromagnetism quiz, physics MCQs, and magnetic field test ensure strong preparation and visibility.

What is the fundamental force responsible for electromagnetism?
a) Gravitational force
b) Electromagnetic force
c) Strong nuclear force
d) Weak nuclear force

Answer
b) Electromagnetic force

Which of the following is not a fundamental property of a charged particle?
a) Charge
b) Mass
c) Spin
d) Color

Answer
d) Color

What is the SI unit of electric charge?
a) Ampere
b) Ohm
c) Volt
d) Coulomb

Answer
d) Coulomb

What is the charge of a proton?
a) Positive
b) Negative
c) Neutral
d) Variable

Answer
a) Positive

What is the charge of an electron?
a) Positive
b) Negative
c) Neutral
d) Variable

Answer
b) Negative

Which type of electromagnetic radiation has the highest energy?
a) Radio waves
b) Microwaves
c) X-rays
d) Infrared waves

Answer
c) X-rays

Which type of electromagnetic radiation has the lowest frequency?
a) Radio waves
b) Microwaves
c) X-rays
d) Infrared waves

Answer
a) Radio waves

What is the SI unit of magnetic field strength?
a) Ampere
b) Ohm
c) Tesla
d) Coulomb

Answer
c) Tesla

What type of current flows in household electrical circuits?
a) DC current
b) AC current
c) Both DC and AC currents
d) None of the above

Answer
b) AC current

Which of the following is used to measure electric current?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Galvanometer

Answer
b) Ammeter

The direction of conventional current is the opposite of the direction of:
a) Protons
b) Electrons
c) Neutrons
d) Photons

Answer
b) Electrons

The magnetic field lines around a straight current-carrying wire are:
a) Parallel to the wire
b) Perpendicular to the wire
c) Concentric circles centered on the wire
d) Randomly distributed

Answer
c) Concentric circles centered on the wire

What is the property of an object that opposes changes in its motion called?
a) Mass
b) Charge
c) Inertia
d) Momentum

Answer
c) Inertia

An electromagnet is created by wrapping a coil of wire around a:
a) Non-magnetic material
b) Permanent magnet
c) Ferromagnetic core
d) Superconductor

Answer
c) Ferromagnetic core

What is the process of generating an electromotive force (EMF) by changing the magnetic field through a circuit?
a) Electromagnetic induction
b) Electromagnetic radiation
c) Electromagnetic interference
d) Electromagnetic resonance

Answer
a) Electromagnetic induction

Which law describes the relationship between the current flowing through a conductor, the voltage across it, and its resistance?
a) Ohm’s law
b) Newton’s law
c) Faraday’s law
d) Coulomb’s law

Answer
a) Ohm’s law

What happens to the resistance of a conductor as its temperature increases?
a) Increases
b) Decreases
c) Remains constant
d) Depends on the material

Answer
a) Increases

What does the right-hand rule for magnetic fields around a current-carrying wire illustrate?
a) The direction of current flow
b) The direction of the magnetic field
c) The relationship between voltage and current
d) The direction of electric field lines

Answer
b) The direction of the magnetic field

What is the process of separating charges in an object without direct contact called?
a) Induction
b) Conduction
c) Polarization
d) Discharge

Answer
a) Induction

The force experienced by a charged particle moving in a magnetic field is called:
a) Electric force
b) Gravitational force
c) Magnetic force
d) Nuclear force

Answer
c) Magnetic force

What is the process of converting mechanical energy into electrical energy called?
a) Induction
b) Conduction
c) Polarization
d) Electromagnetic induction

Answer
d) Electromagnetic induction

Which phenomenon produces a magnetic field in a material when an external magnetic field is applied?
a) Paramagnetism
b) Diamagnetism
c) Ferromagnetism
d) Electromagnetic induction

Answer
a) Paramagnetism

Which type of magnet is used in speakers and headphones?
a) Permanent magnet
b) Electromagnet
c) Ferromagnet
d) Paramagnet

Answer
b) Electromagnet

What is the region around a magnet where its magnetic influence can be detected called?
a) Field of force
b) Magnetic flux
c) Magnetic domain
d) Magnetic field

Answer
d) Magnetic field

What is the process of reversing the direction of current flow in an electric circuit called?
a) Polarization
b) Induction
c) Alternating current
d) Direct current

Answer
c) Alternating current

Which device is used to store electrical energy in the form of magnetic energy?
a) Capacitor
b) Resistor
c) Diode
d) Inductor

Answer
d) Inductor

What is the phenomenon of producing a magnetic field in a coil of wire when a current passes through it?
a) Electromagnetic induction
b) Electromagnetic radiation
c) Electromagnetic interference
d) Electromagnetic resonance

Answer
a) Electromagnetic induction

Which property of an object determines the strength of its magnetic field?
a) Charge
b) Mass
c) Spin
d) Magnetic moment

Answer
d) Magnetic moment

The force between two like magnetic poles is:
a) Attractive
b) Repulsive
c) Dependent on the size of the poles
d) Non-existent

Answer
b) Repulsive

What is the process of generating an electromotive force (EMF) in a coil by varying the magnetic field around it?
a) Self-induction
b) Mutual induction
c) Electromagnetic induction
d) Inverse induction

Answer
c) Electromagnetic induction

What is the term used for the ability of a material to be magnetized?
a) Inductance
b) Susceptibility
c) Conductivity
d) Permeability

Answer
d) Permeability

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 term used for a coil with an iron core that enhances its inductance?
a) Magnetic resistor
b) Magnetic conductor
c) Magnetic insulator
d) Magnetic material

Answer
d) Magnetic material

An inductor behaves like a short circuit for:
a) Direct current (DC)
b) Alternating current (AC)
c) Both DC and AC
d) None of the above

Answer
a) Direct current (DC)

Which type of transformer has more secondary windings than primary windings?
a) Step-up transformer
b) Step-down transformer
c) Isolation transformer
d) Autotransformer

Answer
a) Step-up transformer

In a transformer, the primary and secondary coils are:
a) Electrically connected
b) Electrically isolated
c) Both connected and isolated
d) None of the above

Answer
b) Electrically isolated

The efficiency of an ideal transformer is:
a) 0%
b) 50%
c) 100%
d) Depends on the load

Answer
c) 100%

What is the term used for a coil of wire used to produce a magnetic field?
a) Capacitor
b) Resistor
c) Inductor
d) Conductor

Answer
c) Inductor

The phenomenon of self-induction is observed when:
a) A coil generates an EMF in response to a changing current in the same coil
b) A coil generates an EMF in response to a changing current in another coil
c) A coil generates an EMF in response to a changing magnetic field
d) A coil generates an EMF in response to a changing voltage

Answer
a) A coil generates an EMF in response to a changing current in the same coil

When a coil is connected to a direct current (DC) source, it behaves like:
a) An inductor
b) A capacitor
c) A resistor
d) A superconductor

Answer
c) A resistor

What is the process of inserting an iron core into a coil to increase its inductance?
a) Mutual induction
b) Self-induction
c) Core saturation
d) Magnetic coupling

Answer
c) Core saturation

The process of generating electricity in power plants using electromagnetic induction is most commonly done by:
a) Solar panels
b) Wind turbines
c) Hydroelectric dams
d) Steam turbines

Answer
d) Steam turbines

What is the term used for the changing magnetic field that induces an EMF in a coil?
a) Magnetic flux
b) Magnetic field
c) Magnetic force
d) Magnetic energy

Answer
a) Magnetic flux

What is the process of generating an electromotive force (EMF) in a coil by varying the magnetic field around it?
a) Self-induction
b) Mutual induction
c) Electromagnetic induction
d) Inverse induction

Answer
c) Electromagnetic induction

A step-up transformer has 200 turns in the primary coil and 800 turns in the secondary coil. If the voltage across the primary coil is 120V, what is the voltage across the secondary coil?
a) 30V
b) 120V
c) 480V
d) 240V

Answer
c) 480V

What is the term used for the phenomenon where a changing magnetic field induces a current in a nearby conductor?
a) Capacitance
b) Electromagnetism
c) Inductance
d) Electromagnetic induction

Answer
d) Electromagnetic induction

Which law describes the relationship between the number of turns in the primary and secondary coils of a transformer?
a) Ohm’s law
b) Ampere’s law
c) Lenz’s law
d) Faraday’s law

Answer
c) Lenz’s law

A step-down transformer has 200 turns in the primary coil and 50 turns in the secondary coil. If the voltage across the primary coil is 240V, what is the voltage across the secondary coil?
a) 60V
b) 240V
c) 480V
d) 120V

Answer
d) 120V

The process of generating electricity in power plants using the movement of water is based on:
a) Faraday’s law
b) Ampere’s law
c) Lenz’s law
d) Ohm’s law

Answer
a) Faraday’s law

In a transformer, the core is made of magnetic material to:
a) Increase the resistance of the coils
b) Increase the capacitance of the coils
c) Increase the inductance of the coils
d) Enhance the magnetic coupling between the coils

Answer
d) Enhance the magnetic coupling between the coils

The process of producing a magnetic field in a coil by passing an electric current through it is known as:
a) Electromagnetic induction
b) Electromagnetic radiation
c) Self-induction
d) Electromagnetic conduction

Answer
c) Self-induction

What happens to the induced EMF in a coil if the rate of change of magnetic flux through the coil decreases?
a) Increases
b) Decreases
c) Remains constant
d) Depends on the direction of the magnetic field

Answer
b) Decreases

A transformer with a turns ratio of 1:1 is a:
a) Step-up transformer
b) Step-down transformer
c) Isolation transformer
d) Autotransformer

Answer
c) Isolation transformer

Which type of electromagnetic radiation has the highest energy?
a) Radio waves
b) Microwaves
c) X-rays
d) Infrared waves

Answer
c) X-rays

Which type of electromagnetic radiation has the lowest frequency?
a) Radio waves
b) Microwaves
c) X-rays
d) Infrared waves

Answer
a) Radio waves

What is the SI unit of magnetic field strength?
a) Ampere
b) Ohm
c) Tesla
d) Coulomb

Answer
c) Tesla

What type of current flows in household electrical circuits?
a) DC current
b) AC current
c) Both DC and AC currents
d) None of the above

Answer
b) AC current

Which of the following is used to measure electric current?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Galvanometer

Answer
b) Ammeter

The direction of conventional current is the opposite of the direction of:
a) Protons
b) Electrons
c) Neutrons
d) Photons

Answer
b) Electrons

The magnetic field lines around a straight current-carrying wire are:
a) Parallel to the wire
b) Perpendicular to the wire
c) Concentric circles centered on the wire
d) Randomly distributed

Answer
c) Concentric circles centered on the wire

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