Welcome to the 12th Class Physics Chapter 15 MCQs Practice and Quiz Tests. We are presenting you with top MCQ questions from the 12th Class Physics Chapter 15 Electromagnetic Induction.
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Electromagnetic induction is the process of generating:
a) Electric charge from a magnetic field
b) Magnetic field from an electric charge
c) Electric current from a magnetic field
d) Magnetic field from an electric current
Who is credited with the discovery of electromagnetic induction?
a) Isaac Newton
b) Michael Faraday
c) James Clerk Maxwell
d) Albert Einstein
The phenomenon of electromagnetic induction is governed by:
a) Ohm’s law
b) Newton’s laws of motion
c) Faraday’s laws of electromagnetic induction
d) Coulomb’s law
According to Faraday’s first law of electromagnetic induction, an electromotive force
(EMF) is induced in a coil when:
a) The coil experiences a change in resistance
b) The coil experiences a change in inductance
c) The coil experiences a change in magnetic field
d) The coil experiences a change in capacitance
The process of rotating a coil of wire in a magnetic field to generate electricity is utilized in:
a) Generators
b) Transformers
c) Capacitors
d) Resistors
A coil with 100 turns rotates in a magnetic field at 50 revolutions per second. What is the frequency of the induced EMF?
a) 100 Hz
b) 50 Hz
c) 5000 Hz
d) 0.02 Hz
According to Faraday’s second law of electromagnetic induction, the magnitude of the
induced EMF is directly proportional to:
a) The number of turns in the coil
b) The frequency of the magnetic field
c) The rate of change of magnetic flux through the coil
d) The resistance of the coil
Lenz’s law states that the direction of the induced EMF in a coil opposes the change in
magnetic flux. This law is based on the law of conservation of:
a) Charge
b) Energy
c) Momentum
d) Mass
What is the unit of magnetic flux?
a) Ohm
b) Hertz
c) Tesla
d) Weber
When a magnet is moved into a coil of wire, the direction of the induced current can be determined using:
a) Kirchhoff’s law
b) Lenz’s law
c) Coulomb’s law
d) Ampere’s law
A transformer is used to:
a) Convert electrical energy to mechanical energy
b) Convert mechanical energy to electrical energy
c) Change the voltage of an alternating current
d) Generate a direct current
What type of transformer has more secondary windings than primary windings?
a) Step-up transformer
b) Step-down transformer
c) Isolation transformer
d) Autotransformer
A transformer with a turns ratio of 1:2 is a:
a) Step-up transformer
b) Step-down transformer
c) Isolation transformer
d) Autotransformer
The efficiency of an ideal transformer is:
a) 0%
b) 50%
c) 100%
d) Depends on the load
The primary coil of a transformer has 100 turns, and the secondary coil has 500 turns. If the voltage across the primary coil is 120V, what is the voltage across the secondary coil?
a) 24V
b) 120V
c) 500V
d) 600V
What is the term used for a coil of wire used to produce a magnetic field?
a) Capacitor
b) Resistor
c) Inductor
d) Conductor
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
The process of inserting an iron core into a coil to increase its inductance is known as:
a) Mutual induction
b) Self-induction
c) Core saturation
d) Magnetic coupling
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
The energy stored in an inductor is proportional to the:
a) Resistance of the coil
b) Voltage across the coil
c) Current passing through the coil
d) Number of turns in the coil
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
Which device is used to store electrical energy in the form of magnetic energy?
a) Capacitor
b) Resistor
c) Diode
d) Inductor
A coil has an inductance of 5 Henrys. If the current passing through the coil changes at a rate of 2 amperes per second, what is the induced EMF?
a) 2 volts
b) 5 volts
c) 10 volts
d) 7 volts
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
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
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
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
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
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
Which type of current is used in most power distribution systems?
a) Direct current (DC)
b) Alternating current (AC)
c) Both DC and AC
d) None of the above
What is the relationship between the number of turns in the primary and secondary coils of a transformer?
a) They are equal
b) The number of turns in the secondary coil is greater
c) The number of turns in the primary coil is greater
d) There is no relationship between the number of turns
An electric generator converts:
a) Mechanical energy into electrical energy
b) Electrical energy into mechanical energy
c) Thermal energy into electrical energy
d) Chemical energy into electrical energy
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
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
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
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
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
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
A transformer with a turns ratio of 1:1 is a:
a) Step-up transformer
b) Step-down transformer
c) Isolation transformer
d) Autotransformer
Which type of electromagnetic radiation has the highest energy?
a) Radio waves
b) Microwaves
c) X-rays
d) Infrared waves
Which type of electromagnetic radiation has the lowest frequency?
a) Radio waves
b) Microwaves
c) X-rays
d) Infrared waves
What is the SI unit of magnetic field strength?
a) Ampere
b) Ohm
c) Tesla
d) Coulomb
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
Which of the following is used to measure electric current?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Galvanometer
The direction of conventional current is the opposite of the direction of:
a) Protons
b) Electrons
c) Neutrons
d) Photons
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
What is the property of an object that opposes changes in its motion called?
a) Mass
b) Charge
c) Inertia
d) Momentum
An electromagnet is created by wrapping a coil of wire around a:
a) Non-magnetic material
b) Permanent magnet
c) Ferromagnetic core
d) Superconductor
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
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
What happens to the resistance of a conductor as its temperature increases?
a) Increases
b) Decreases
c) Remains constant
d) Depends on the material
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
What is the process of separating charges in an object without direct contact called?
a) Induction
b) Conduction
c) Polarization
d) Discharge
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
What is the process of converting mechanical energy into electrical energy called?
a) Induction
b) Conduction
c) Polarization
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
Which type of magnet is used in speakers and headphones?
a) Permanent magnet
b) Electromagnet
c) Ferromagnet
d) Paramagnet
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
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
Which device is used to store electrical energy in the form of magnetic energy?
a) Capacitor
b) Resistor
c) Diode
d) Inductor
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