Aspiring educators aiming to ace the HTET 2023
examination recognize the significance of a strong grasp of physics, especially
when it comes to topics like "Electromagnetic Induction." This
concept is a cornerstone of the physics syllabus and is frequently featured in
multiple-choice questions (MCQs) on the HTET exam.
Electromagnetic
Induction Demystified: A Path to HTET Success
Electromagnetic induction is a foundational
principle in electromagnetism that plays a pivotal role in various aspects of
physics and engineering. It's a subject that is commonly tested in the HTET
examination and is crucial for securing a favorable score. In this blog, we'll
take you on a journey through a comprehensive set of MCQs focused on
Electromagnetic Induction, helping you to master this topic and thrive in your
HTET 2023 preparations.
Mastering
MCQs on Electromagnetic Induction: Your HTET 2023 Advantage
If you aspire to pursue a teaching career in Haryana
and have your sights set on acing the HTET 2023 examination, you must be
well-prepared to tackle MCQs on Electromagnetic Induction with confidence.
These multiple-choice questions are designed to evaluate your understanding of
electromagnetic induction, Faraday's laws, Lenz's law, and their applications
in various contexts. To support your preparation efforts, we've meticulously
curated a collection of MCQs that encompass the diverse aspects of
electromagnetic induction. These questions are aligned with the HTET 2023
syllabus, ensuring that you are fully equipped to address any electromagnetic
induction-related queries that may arise.
Our
Electromagnetic Induction MCQs cover essential topics such as:
Faraday's laws of electromagnetic induction.
Lenz's law and its implications.
Applications of electromagnetic induction in everyday
life and technology.
Electromagnetic
induction in different magnetic field scenarios.
By studying and practicing these MCQs, you'll not
only gain a profound understanding of electromagnetic induction but also
enhance your problem-solving skills, time management, and exam-taking
strategies.
1. What does Faraday's law of electromagnetic induction state?
A)
The
magnetic field produced by a current-carrying wire induces an electric field in
a nearby wire.
B)
The
rate of change of magnetic flux through a closed loop induces an electromotive
force (EMF) in the loop.
C)
The
resistance of a conductor is directly proportional to the current passing
through it.
D)
Electromagnetic
waves can propagate through a vacuum.
2.
In electromagnetic induction, if you
increase the number of loops in a coil while keeping other factors constant,
what happens to the induced EMF?
A)
It
decreases.
B)
It
remains the same.
C)
It
increases.
D)
It
becomes zero.
3.
Which of the following factors affects the
magnitude of the induced EMF in a coil when the magnetic flux is changing?
A)
The
resistance of the coil.
B)
The
shape of the coil.
C)
The
speed of the change in magnetic flux.
D)
The
material of the coil.
4.
A coil is placed near a strong permanent
magnet. If the coil is moved closer to the magnet, what happens to the induced
current in the coil?
A)
It
decreases.
B)
It
remains the same.
C)
It
increases.
D)
It
becomes zero.
5.
Which device is commonly used to convert
mechanical energy into electrical energy based on the principle of electromagnetic
induction?
A)
Transformer
B)
Capacitor
C)
Generator
D)
Resistor
6.
Lenz's Law is a consequence of which
principle in electromagnetic induction?
A)
Conservation
of charge
B)
Conservation
of energy
C)
Ohm's
law
D)
Coulomb's
law
7.
What is the SI unit of magnetic flux?
A)
Weber
(WB)
B)
Tesla
(T)
C)
Henry
(H)
D)
Ohm
(Ω)
8.
When a coil is rotated within a magnetic
field, what type of alternating current is generated?
A)
Direct
current (DC)
B)
Alternating
current (AC)
C)
Pulsating
current
D)
Static
current
9.
Which of the following materials does not
significantly affect the strength of a magnetic field?
A)
Iron
B)
Copper
C)
Nickel
D)
Ferromagnetic
materials
10.
In an AC circuit, what is the phase
relationship between the voltage across a coil and the current passing through
it?
A)
In
phase
B)
90
degrees out of phase (leading)
C)
90
degrees out of phase (lagging)
D)
180
degrees out of phase
11.
Which of the following factors does NOT
affect the magnitude of the induced EMF in a coil?
A)
The
number of turns in the coil.
B)
The
strength of the magnetic field.
C)
The
resistance of the coil.
D)
The
temperature of the coil.
12.
What is the direction of the induced
current in a coil, according to Lenz's Law, when the magnetic flux through the
coil is decreasing?
A)
Clockwise,
opposing the change in flux.
B)
Counterclockwise,
opposing the change in flux.
C)
Clockwise,
aiding the change in flux.
D)
Counterclockwise,
aiding the change in flux.
13.
When a bar magnet is moved back and forth
inside a coil, what type of current is induced in the coil?
A)
Direct
current (DC)
B)
Alternating
current (AC)
C)
Pulsating
current
D)
No
current is induced.
14.
Which law relates the induced EMF in a
closed loop to the rate of change of magnetic flux through the loop?
A)
Gauss's
Law
B)
Ampere's
Law
C)
Faraday's
Law of Electromagnetic Induction
D)
Ohm's
Law
15.
What is the purpose of a commutator in a
DC generator?
A)
To
reverse the direction of the induced current.
B)
To
convert AC to DC.
C)
To
increase the speed of the generator.
D)
To
improve efficiency.
16.
Which of the following factors affects the
frequency of the induced AC voltage in a generator?
A)
The
number of turns in the coil.
B)
The
strength of the magnetic field.
C)
The
speed of rotation.
D)
The
resistance of the coil.
17.
In a transformer, if the number of turns
in the secondary coil is greater than the number of turns in the primary coil,
what happens to the output voltage?
A)
It
increases.
B)
It
decreases.
C)
It
remains the same.
D)
It
depends on the material of the core.
18.
Which of the following materials is
commonly used as a core in transformers to enhance their magnetic properties?
A)
Aluminum
B)
Copper
C)
Wood
D)
Iron
19.
When two coils are placed close to each
other, and an AC current flows through one coil, what phenomenon occurs in the
second coil?
A)
Inductive
coupling
B)
Capacitive
coupling
C)
Mutual
inductance
D)
Self-inductance
20. What is the unit of inductance?
A)
Henry
(H)
B)
Volt
(V)
C)
Ampere
(A)
D)
Watt
(W)
21.
What happens to the induced voltage in a
coil when the rate of change of magnetic flux through the coil increases?
A)
It
decreases.
B)
It
remains the same.
C)
It
increases.
D)
It
becomes zero.
22.
A transformer with a turns ratio of 1:2 is
used to step up voltage. If the primary voltage is 120 volts, what is the
secondary voltage?
A)
30
volts
B)
60
volts
C)
120
volts
D)
240
volts
23.
In a DC motor, what is the function of the
commutator?
A)
To
generate magnetic flux
B)
To
reverse the direction of current
C)
To
increase the speed of rotation
D) To control the voltage
24.
When a coil is moved perpendicular to a
magnetic field, what is the orientation of the induced EMF relative to the
motion?
A)
Parallel
to the motion
B)
Perpendicular
to the motion
C)
Opposite
to the motion
D)
In
the direction of motion
25.
What type of current flows through the
primary coil of a transformer?
A)
AC
(Alternating Current)
B)
DC
(Direct Current)
C)
Pulsating
current
D)
No
current flows through the primary coil.
26.
Which law states that the electromotive
force (EMF) induced in a circuit is equal to the rate of change of magnetic
flux through the circuit?
A)
Ampere's
Law
B)
Coulomb's
Law
C)
Ohm's
Law
D)
Faraday's
Law of Electromagnetic Induction
27.
What is the primary function of the core
in an electromagnetic coil?
A)
To
increase resistance
B)
To
reduce inductance
C)
To
concentrate magnetic field lines
D)
To
decrease the number of turns
28.
In a step-down transformer, if the primary
coil has 100 turns and the secondary coil has 50 turns, what is the turns
ratio?
A)
2:1
B)
1:2
C)
1:1
D)
100:50
29.
When an iron rod is inserted inside a
coil, what happens to the inductance of the coil?
A)
It
decreases.
B)
It
remains the same.
C)
It
increases.
D)
It
becomes zero.
30.
What is the phase difference between the
voltage across the coil and the current passing through it in an inductive
circuit with a lagging power factor?
A)
0
degrees
B)
45
degrees
C)
90
degrees
D)
180
degrees
31.
Which of the following devices is
primarily based on electromagnetic induction?
A)
Electric
heater
B)
Solar
panel
C)
Microwave
oven
D)
Induction
cooker
32.
When a magnet is moved into a solenoid,
what factors affect the magnitude of the induced EMF?
A)
Magnet
size and color
B)
Solenoid
diameter and length
C)
Magnet
speed and solenoid resistance
D)
Magnet
strength and rate of change of magnetic flux
33.
What is the direction of the magnetic
field in a solenoid when current flows through it?
A)
Along
the axis of the solenoid
B)
Radially
outward from the solenoid
C)
Perpendicular
to the axis of the solenoid
D)
There
is no magnetic field in a solenoid.
34.
Which law relates the magnetic field
strength (H), magnetic flux (Φ), and magnetic susceptibility (χ) of a material?
A)
Ohm's
Law
B)
Ampere's
Law
C)
Gauss's
Law
D)
Faraday's
Law
35.
What type of current is typically produced
by a rectifier?
A)
Direct
current (DC)
B)
Alternating
current (AC)
C)
Pulsating
current
D)
No
current
36.
In a step-up transformer, if the primary
coil has 200 turns and the secondary coil has 800 turns, what is the turns
ratio?
A)
4:1
B)
1:4
C)
1:2
D)
2:1
37.
What is the primary function of the iron
core in a transformer?
A)
To
increase resistance
B)
To
decrease inductance
C)
To
reduce hysteresis losses
D)
To
enhance magnetic coupling
38.
Which of the following materials exhibits
the highest magnetic permeability?
A)
Aluminum
B)
Copper
C)
Air
D)
Iron
39.
In an RL circuit, if the resistance (R) is
increased, what happens to the time constant (Ï„) of the circuit?
A)
Ï„
decreases
B)
Ï„
remains the same
C)
Ï„
increases
D)
Ï„
becomes zero
40.
What does the back emf
(counter-electromotive force) in a DC motor oppose?
A)
The
armature's motion
B)
The
magnetic field
C)
The
commutator's rotation
D)
The
direction of the current
41. When a conductor is moved perpendicular to the direction of a magnetic field, what is the effect on the induced EMF?
A)
It
increases.
B)
It
decreases.
C)
It
remains the same.
D)
It
becomes zero.
42.
What is the formula for calculating the
induced EMF (ε) in a coil?
A)
ε = N
* ΔB
B)
ε = N
* ΔΦ / Δt
C)
ε = I
/ R
D)
ε = V
/ I
43.
Which of the following devices uses
electromagnetic induction to measure electric current?
A)
Voltmeter
B)
Ammeter
C)
Oscilloscope
D)
Galvanometer
44.
What is the direction of the induced
current in a coil if the magnetic flux through the coil remains constant?
A)
Clockwise
B)
Counterclockwise
C)
No
current is induced.
D)
Depends
on the resistance of the coil.
45.
In a transformer, which coil is connected
to the AC power source, the primary or secondary coil?
A)
Primary
coil
B)
Secondary
coil
C)
Both
are connected to separate sources.
D)
It
depends on the design.
46.
What type of material is used as a core in
an electromagnet to enhance its magnetic properties?
A)
Aluminum
B)
Copper
C)
Steel
D)
Silver
47.
In an AC circuit, what is the phase
relationship between voltage and current in a purely resistive load?
A)
In-phase
(0 degrees phase difference)
B)
Out
of phase by 90 degrees (leading)
C)
Out
of phase by 90 degrees (lagging)
D)
Out
of phase by 180 degrees
48.
What happens to the magnetic field inside
a solenoid when the current passing through it is increased?
A)
It
weakens.
B)
It
remains the same.
C)
It
reverses direction.
D)
It
strengthens.
49.
What does the term
"self-inductance" refer to in an electrical circuit?
A)
The
inductance of a coil due to its own magnetic field
B)
The
mutual inductance between two coils
C)
The
resistance of a coil
D)
The
capacitance of a capacitor
50.
In an AC circuit, what is the phase
difference between the voltage across a purely inductive load and the current
passing through it?
A)
0
degrees
B)
45
degrees
C)
90
degrees
D)
180
degrees
51.
Which law describes the direction of the
induced current in a closed loop due to a changing magnetic flux?
A)
Ampere's
Law
B)
Gauss's
Law
C)
Lenz's
Law
D)
Ohm's
Law
52. When
an alternating current (A
53.
C) flows through a coil, what type of
magnetic field is produced?
A)
A
stationary magnetic field
B)
A
pulsating magnetic field
C)
A
rotating magnetic field
D)
A
random magnetic field
54. What
is the relationship between the frequency of an alternating current (A
55.
C) and the number of cycles per second?
A)
Inversely
proportional
B)
Directly
proportional
C)
No
relationship
D)
Exponential
relationship
56.
In a step-down transformer, if the primary
coil has 400 turns and the secondary coil has 100 turns, what is the voltage
ratio?
A)
1:4
B)
4:1
C)
1:2
D)
2:1
57.
Which of the following factors does NOT
affect the inductance of a coil?
A)
The
number of turns in the coil
B)
The
cross-sectional area of the coil
C)
The
material of the core
D)
The
resistance of the coil
58.
What is the purpose of laminated iron
cores in transformers?
A)
To
reduce inductance
B)
To
increase resistance
C)
To
minimize eddy current losses
D)
To
decrease the number of turns in the coils
59.
Which of the following is an example of a
non-contact method of generating electromagnetic induction?
A)
Sliding
a magnet into a coil
B)
Rotating
a coil within a magnetic field
C)
Shaking
a coil near a permanent magnet
D)
None
of the above
60.
What is the unit of magnetic
susceptibility?
A)
Henry
(H)
B)
Tesla
(T)
C)
Ampere
(A)
D)
Dimensionless
61. When the frequency of an AC voltage is increased while keeping the voltage amplitude constant, what happens to the inductive reactance of an inductor in the circuit?
A)
It
decreases
B)
It
remains the same
C)
It
increases
D)
It
becomes zero
62.
What is the purpose of a choke coil in an
electronic circuit?
A)
To
store energy
B)
To
block DC current
C)
To
regulate voltage
D)
To
amplify signals
63.
What is the unit of inductive reactance in
an AC circuit?
A)
Ohm
(Ω)
B)
Henry
(H)
C)
Volt
(V)
D)
Ampere
(A)
64.
Which phenomenon occurs when a
ferromagnetic material retains some magnetism even after the magnetic field is
removed?
A)
Diamagnetism
B)
Paramagnetism
C)
Ferromagnetism
D)
Antiferromagnetism
65.
In an AC circuit with a pure inductance,
what is the phase relationship between the voltage across the inductor and the
current passing through it?
A)
Voltage
leads current by 90 degrees
B)
Voltage
lags current by 90 degrees
C)
Voltage
and current are in phase
D)
Voltage
and current are 180 degrees out of phase
66.
What is the role of a rectifier in a power
supply circuit?
A)
To
convert DC to AC
B)
To
regulate voltage
C)
To
convert AC to DC
D)
To
amplify signals
67.
Which of the following factors affects the
self-inductance of a coil?
A)
The
number of turns
B)
The
resistance of the coil
C)
The
shape of the coil
D)
The
material of the core
68.
In an AC circuit, what is the phase
relationship between the voltage and current in a purely capacitive load?
A)
Voltage
leads current by 90 degrees
B)
Voltage
lags current by 90 degrees
C)
Voltage
and current are in phase
D)
Voltage
and current are 180 degrees out of phase
69.
What is the SI unit of magnetic field
strength (H)?
A)
Tesla
(T)
B)
Henry
(H)
C)
Ampere
(A)
D)
Weber
(WB)
70.
Which law describes the relationship
between the magnetic field strength (H) and the magnetic flux (Φ) in a magnetic
circuit?
A)
Faraday's
Law
B)
Gauss's
Law
C)
Ampere's
Law
D)
Ohm's
Law
71.
When a coil is rapidly switched on and off
in an electrical circuit, what type of voltage is induced across it?
A)
AC
voltage
B)
DC
voltage
C)
Pulsating
voltage
D)
No
voltage is induced
72.
What happens to the inductive reactance of
a coil in an AC circuit when the frequency of the AC voltage is increased?
A)
It
decreases
B)
It remains
the same
C)
It
increases
D)
It
becomes zero
73.
Which law explains that an induced
electromotive force (EMF) creates a current that opposes the change in magnetic
flux?
A)
Ampere's
Law
B)
Lenz's
Law
C)
Faraday's
Law
D)
Gauss's
Law
74.
What happens to the magnetic field
strength inside a solenoid when the number of turns in the coil increases?
A)
It
weakens
B)
It
remains the same
C)
It
strengthens
D)
It
becomes zero
75.
In a transformer, if the primary coil has
300 turns and the secondary coil has 600 turns, what is the turns ratio?
A)
1:2
B)
2:1
C)
1:3
D)
3:1
76.
Which of the following materials is
commonly used as an insulator in the windings of transformers and coils?
A)
Copper
B)
Aluminum
C)
Paper
D)
Silver
77.
In a generator, what is the component
responsible for producing a rotating magnetic field?
A)
Stator
B)
Rotor
C)
Armature
D)
Commutator
78.
What is the SI unit of magnetic flux?
A)
Henry
(H)
B)
Weber
(WB)
C)
Tesla
(T)
D)
Gauss
(G)
79.
When a magnet is moved farther away from a
coil, what happens to the induced EMF in the coil?
A)
It
increases
B)
It
decreases
C)
It
remains the same
D)
It
becomes zero
80.
What is the relationship between the
frequency and wavelength of an electromagnetic wave?
A)
Inversely
proportional
B)
Directly
proportional
C)
No
relationship
D) Exponentially related
81. In an AC circuit with a pure capacitive load, what is the phase relationship between the voltage and current?
A)
Voltage
leads current by 90 degrees
B)
Voltage
lags current by 90 degrees
C)
Voltage
and current are in phase
D)
Voltage
and current are 180 degrees out of phase
82.
What is the purpose of a flyback diode
(freewheeling diode) connected in parallel with a coil or inductor in a
circuit?
A)
To
block the flow of current
B)
To
amplify the current
C)
To
prevent voltage spikes
D)
To
regulate voltage
83.
What is the primary function of the core
in an electromagnetic coil or solenoid?
A)
To
increase resistance
B)
To
decrease inductance
C)
To
concentrate and enhance the magnetic field
D)
To
reduce the number of turns in the coil
84.
In an AC circuit, what happens to the
reactance of a capacitor when the frequency of the AC voltage is increased?
A)
It
decreases
B)
It
remains the same
C)
It
increases
D)
It
becomes zero
85.
Which of the following statements is true
about a step-up transformer?
A)
It
increases voltage and decreases current.
B)
It
decreases voltage and increases current.
C)
It
decreases both voltage and current.
D)
It
has no effect on voltage and current.
86.
What is the formula for calculating
inductive reactance (XL) in an AC circuit?
A)
XL =
R / L
B)
XL =
L / R
C)
XL =
2Ï€fL
D)
XL =
1 / (2Ï€fL)
87.
Which type of magnetism is exhibited by
materials like aluminum or copper?
A)
Diamagnetism
B)
Ferromagnetism
C)
Paramagnetism
D)
Antiferromagnetism
88.
What is the direction of the induced
current in a coil when the magnetic flux through the coil is increasing?
A)
Clockwise,
opposing the change in flux
B)
Counterclockwise,
opposing the change in flux
C)
Clockwise,
aiding the change in flux
D)
Counterclockwise,
aiding the change in flux
89.
Which law relates the magnetic field
produced by a closed loop of current to the current passing through it?
A)
Ampere's
Law
B)
Faraday's
Law
C)
Lenz's
Law
D)
Ohm's
Law
90.
In an AC circuit with a pure inductance,
what is the phase relationship between voltage and current?
A)
Voltage
leads current by 90 degrees
B)
Voltage
lags current by 90 degrees
C)
Voltage
and current are in phase
D)
Voltage
and current are 180 degrees out of phase
91.
Which material is commonly used as a core
in high-frequency transformers and inductors due to its high permeability?
A)
Air
B)
Copper
C)
Silicon
steel (electrical steel)
D)
Wood
92.
What is the primary function of a
capacitor in an electrical circuit?
A)
To
store electrical energy
B)
To
resist the flow of current
C)
To
produce a magnetic field
D)
To
amplify signals
In conclusion,conquering the concept of electromagnetic induction is a pivotal step toward
achieving success in the HTET 2023 examination. Our meticulously crafted MCQs
on electromagnetic induction will serve as your comprehensive guide, empowering
you to build the knowledge and confidence necessary to excel in this critical
physics subject. Dive into the world of electromagnetic induction MCQs, refine
your expertise, and pave the way for a rewarding teaching career in Haryana.
Don't leave your HTET success to chance—kickstart your electromagnetic
induction journey with us today!
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