Class 10 Physics Chapter 6
Updated: 18 Dec 2023
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Class 10 Physics Chapter 6 introduces the concept of “Electromagnetism”. This is mainly chapter No. 15, “Electromagnetism”, of the book of Class 10.
This article consists of Notes, SLO Based Notes and MCQs of Physics, which cover your course, board papers and clear your Physics concept for different types of tests.
Class 10 Physics Chapter 6 Notes
Electromagnetism
SLO Base Notes
Class 10 Physics Chapter 6 MCQs
1. What is the region around a magnet where magnetic effects can be observed called?(a) Electric field
(b) Magnetic field
(c) Induction field
(d) Charge field
Show Answer
Magnetic field
2. How is the magnetic field represented?
(a) Epsilon (\varepsilon)
(b) Magnetic charge (q_M)
(c) Magnetic field vector (B)
(d) Electric induction vector (E)
Show Answer
Magnetic field vector (B)
3. When do charges exhibit magnetic behavior?
(a) Only at rest
(b) Only when moving
(c) Both at rest and when moving
(d) Neither at rest nor when moving
Show Answer
Only when moving
4. Stationary charges produce:
(a) Only electric fields
(b) Both electric and magnetic fields
(c) Only magnetic fields
(d) Neither electric nor magnetic fields
Show Answer
Only electric fields
5. Moving charges generate:
(a) Only electric fields
(b) Both electric and magnetic fields
(c) Only magnetic fields
(d) Neither electric nor magnetic fields
Show Answer
Both electric and magnetic fields
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6. How can the magnetic field around a current-carrying wire be detected?(a) Using a voltmeter
(b) Measuring electric potential
(c) Bringing a compass needle close
(d) Observing electric sparks
Show Answer
Bringing a compass needle close
7. When current passes through a long wire, how do compass needles around it align?
(a) In a straight line
(b) In a circular pattern
(c) In a random pattern
(d) In a square pattern
Show Answer
In a circular pattern
8. In the absence of current in the wire, how do compass needles align with Earth’s magnetic field?
(a) Parallel to the ground
(b) Pointing southward
(c) Pointing northward
(d) In a vertical position
Show Answer
Pointing northward
9. How does the compass needle deflect when the current is reversed in a wire?
(a) It remains unchanged
(b) It deflects in the same direction
(c) It deflects at a right angle
(d) It deflects in the opposite direction
Show Answer
It deflects in the opposite direction
10. What is used to determine the direction of the magnetic field around a current-carrying wire?
(a) Left-hand rule
(b) Right-hand rule I
(c) Left-foot rule
(d) Thumb rule
Show Answer
Right-hand rule I
11. According to Right-hand rule I, how are fingers positioned in relation to the magnetic field direction?
(a) Pointing away
(b) Pointing towards the wire
(c) Curled around the wire
(d) Extended straight
Show Answer
Curled around the wire
12. In Right-hand rule I, what does the thumb represent?
(a) Magnetic field direction
(b) Current direction
(c) Wire direction
(d) Compass needle direction
Show Answer
Current direction
13. How is Right-hand rule I modified for the direction of the magnetic field in electronic current flow?
(a) It remains the same
(b) Applied with the right hand
(c) Applied with the left hand
(d) None of these
Show Answer
Applied with the left hand
14. What happens when a steady current flows through a loop of wire?
(a) The magnetic field is absent
(b) The magnetic field forms a single pole
(c) The magnetic field forms both north and south poles
(d) The magnetic field only exists outside the coil
Show Answer
The magnetic field forms both north and south poles
15. Which hand rule is used to determine the direction of the magnetic field around a loop of wire carrying current?
(a) Left-hand rule l
(b) Right-hand rule ll
(c) Right-hand rule lll
(d) No rule is applicable
Show Answer
Right-hand rule ll
16. How does the arrangement of magnetic field lines inside a coil differ from outside?
(a) The field lines are weaker inside
(b) The field lines are absent inside
(c) The field lines are packed closer together inside
(d) The field lines are stronger outside
Show Answer
The field lines are packed closer together inside
17. Why is the magnetic field stronger inside the coil compared to outside?
(a) Due to absence of field lines inside
(b) The current is weaker inside
(c) The coil material enhances the magnetic field outside
(d) Field lines cannot cross, so they are packed closer inside
Show Answer
Field lines cannot cross, so they are packed closer inside
18. What shape is formed when a coil is shaped as a spiral (helix) to produce a magnetic field resembling that of a bar magnet?
(a) Circle
(b) Square
(c) Solenoid
(d) Triangle
Show Answer
Solenoid
19. What is the characteristic of the magnetic field produced by a solenoid when current passes through it?
(a) Strong outside, weak inside
(b) Uniform and strong along the solenoid’s axis
(c) Absent along the solenoid’s axis
(d) Circular and weak along the solenoid’s axis
Show Answer
Uniform and strong along the solenoid’s axis
20. In a tightly wound solenoid, how does the magnetic field inside compare to the exterior?
(a) Weaker and non-uniform inside
(b) Uniform and strong inside
(c) Circular and weak inside
(d) Non-existent inside
Show Answer
Uniform and strong inside
21. What is the role of Right-Hand Rule II in determining the direction of the magnetic poles of a solenoid?
(a) It determines the solenoid’s shape
(b) It establishes the strength of the magnetic field
(c) It helps determine the direction of the north pole
(d) It decides the amount of current flowing
Show Answer
It helps determine the direction of the north pole
22. According to Right-Hand Rule II, how should the fingers be oriented to determine the direction of the north pole in a solenoid?
(a) Pointing toward the current
(b) Cutting through the solenoid
(c) In the direction of the magnetic field lines
(d) Wrapped around the solenoid’s axis
Show Answer
Pointing toward the current
23. When using Right-Hand Rule II for a solenoid, if the fingers represent the direction of the current, what does the extended thumb indicate?
(a) Magnitude of current
(b) Direction of north pole
(c) Resistance of the solenoid
(d) Electric potential
Show Answer
Direction of north pole
24. If the current direction in a solenoid is reversed, how does Right-Hand Rule II predict the change in the direction of the north pole?
(a) The north pole remains unchanged
(b) The north pole reverses its direction
(c) The solenoid loses its north pole
(d) The north pole becomes weaker
Show Answer
The north pole reverses its direction
25. How is Right-hand rule Il modified for the direction of the magnetic field in electronic current flow?
(a) It remains the same
(b) Applied with the right hand
(c) Applied with the left hand
(d) None of these
Show Answer
Applied with the left hand
26. What happens when a current-carrying wire is placed in a magnetic field?
(a) The wire disintegrates
(b) Charges in the wire interact with the external magnetic field
(c) The wire becomes an insulator
(d) The magnetic field is absorbed by the wire
Show Answer
Charges in the wire interact with the external magnetic field
27. What is the direction of the force experienced by a current-carrying wire in a magnetic field?
(a) Parallel to the current
(b) Opposite to the direction of the current
(c) Perpendicular to both the current and the magnetic field
(d) Along the magnetic field lines
Show Answer
Perpendicular to both the current and the magnetic field
28. How does the force on a current-carrying wire change when the direction of the current is reversed?
(a) The force remains unchanged
(b) The force becomes weaker
(c) The force becomes stronger
(d) The force reverses its direction
Show Answer
The force reverses its direction
29. When is the force on the current-carrying wire maximum?
(a) When the wire is parallel to the magnetic field
(b) When the wire is at a 45-degree angle to the magnetic field
(c) When the wire is perpendicular to the magnetic field
(d) When the wire is anti-parallel to the magnetic field
Show Answer
When the wire is perpendicular to the magnetic field
30. When the current-carrying wire is parallel to the magnetic field, what happens to the force experienced by the wire?
(a) The force becomes maximum
(b) The force remains constant
(c) The force becomes zero
(d) The force reverses its direction
Show Answer
The force becomes zero
31. What factors is the force experienced by a current-carrying conductor in a magnetic field directly proportional to?
(a) Resistance and voltage
(b) Current, magnetic field strength, length of the wire, and sine of the angle
(c) Temperature and material composition
(d) Conductor diameter and color
Show Answer
Current, magnetic field strength, length of the wire, and sine of the angle
32. What is the SI unit for magnetic field strength (B)?
(a) Joule (J)
(b) Newton (N)
(c) Tesla (T)
(d) Ampere (A)
Show Answer
Tesla (T)
33. What is used to determine the direction of force on a current-carrying wire in a magnetic field?
(a) Right-hand rule I
(b) Left-hand rule
(c) Right-hand rule III or Fleming’s Left-hand rule
(d) Left-hand rule III or Fleming’s Right-hand rule
Show Answer
Right-hand rule III or Fleming’s Left-hand rule
34. At what angle does the magnetic force on a current-carrying conductor reach its maximum value?
(a) 0 degrees
(b) 45 degrees
(c) 180 degrees
(d) 90 degrees
Show Answer
90 degrees
35. If the current in the wire is doubled while the angle between the wire and the magnetic field remains constant, what happens to the magnetic force on the wire?
(a) The force becomes half
(b) The force doubles
(c) The force remains unchanged
(d) The force becomes zero
Show Answer
The force doubles
36. What happens to the magnetic force (F) when the length of the conductor (L) is doubled?
(a) F doubles
(b) F halves
(c) F remains unchanged
(d) F becomes zero
Show Answer
F doubles
37. If the magnetic field strength (B) is increased, how does it affect the magnetic force (F)?
(a) F increases
(b) F remains constant
(c) F decrease
(d) F becomes zero
Show Answer
F increases
38. Find the magnetic force (F) when a wire with B = 9 \ T, I = 1 \ A, L = 2 \ m \ and \ \theta = 90 \ degrees is subjected to a magnetic field.
(a) 2.07 N
(b) 18 N
(c) 4.5 N
(d) 5.2 N
Show Answer
18 N
39. A magnetic force of 30 N is exerted in a region where the magnetic field is 2 T and the current is 5 A. What is the length (L) of the conductor?
(a) 1.5 m
(b) 3 m
(c) 6 m
(d) 15 m
Show Answer
3 m
40. When a force of 80 N is experienced in a region with a current of 4 A and a length of 10 m, what is the magnetic field?
(a) 0.5 T
(b) 1 T
(c) 2 T
(d) 5 T
Show Answer
2 T
41. If a magnetic force of 120 N is exerted in a region with a length of 10 m and a magnetic field of 4 T, what is the current in the conductor?
(a) 3 A
(b) 4 A
(c) 8 A
(d) 20 A
Show Answer
3 A
42. According to Fleming’s left-hand rule, what does the extended thumb represent?
(a) Direction of current
(b) Direction of magnetic field
(c) Direction of magnetic force
(d) Magnitude of the force
Show Answer
Direction of magnetic force
43. In Fleming’s left-hand rule, which finger represents the direction of magnetic field?
(a) Thumb
(b) Index finger
(c) Middle finger
(d) Ring finger
Show Answer
Index finger
44. According to Fleming’s left-hand rule, what does the middle finger represent?
(a) Magnitude of the force
(b) Direction of magnetic field
(c) Direction of current
(d) Force exerted on the conductor
Show Answer
Direction of current
45. What happens when a current-carrying coil is placed in a uniform magnetic field?
(a) It experiences a net force
(b) It becomes insulating
(c) It generates heat
(d) It loses its magnetic properties
Show Answer
It experiences a net force
46. Which energy conversion takes place in a DC motor?
(a) Electrical to thermal
(b) Mechanical to electrical
(c) Electrical to mechanical
(d) Thermal to mechanical
Show Answer
Electrical to mechanical
47. What is the basic principle behind the operation of a DC motor?
(a) Heat generation in the coil
(b) Interaction of magnetic fields
(c) Rotation of the spindle
(d) None of these
Show Answer
Interaction of magnetic fields
48. Where can electric motors, including DC motors, be commonly found?
(a) Refrigerators
(b) Gas stoves
(c) Incandescent bulbs
(d) Wooden furniture
Show Answer
Refrigerators
49. Why does the coil in a DC motor experience a torque and start turning?
(a) Due to the force of gravity
(b) Interaction of current-carrying wire and a magnetic field
(c) Contact with the permanent magnet
(d) Random oscillations in the coil
Show Answer
Interaction of current-carrying wire and a magnetic field
50. What would happen if the direction of the current in the coil of a DC motor remained constant?
(a) The coil would not experience any force
(b) The torque would not change
(c) The coil would oscillate back and forth
(d) The motor would stop rotating
Show Answer
The coil would oscillate back and forth
51. How does the direction of the torque/couple acting on the coil change during rotation in a DC motor?
(a) It remains constant
(b) It reverses periodically
(c) It increases continuously
(d) It depends on the size of the coil
Show Answer
It reverses periodically
52. Why is the armature in a DC motor typically made of soft iron?
(a) To conduct electricity better
(b) To reduce the weight of the motor
(c) To amplify the magnetic field
(d) To resist magnetic effects
Show Answer
To amplify the magnetic field
53. In a DC motor, what happens if the armature is replaced with a non-magnetic material?
(a) The motor efficiency increases
(b) The motor would not function
(c) The torque acting on the coil decreases
(d) The direction of rotation changes
Show Answer
The motor would not function
54. Which part of the DC motor is responsible for converting electrical energy into mechanical energy?
(a) Coil
(b) Spindle
(c) Armature
(d) Permanent magnet
Show Answer
Armature
55. What is the consequence of increasing the number of turns in the coil of a DC motor?
(a) Decreased torque
(b) Increased electrical resistance
(c) Enhanced magnetic effects
(d) Reduced mechanical output
Show Answer
Enhanced magnetic effects
56. What is the purpose of the split ring in a DC motor?
(a) To generate electrical power
(b) To reverse the direction of the magnetic field
(c) To control the speed of rotation
(d) To facilitate continuous rotation of the coil
Show Answer
To facilitate continuous rotation of the coil
57. Why are the ends of the coil attached to the commutator in a DC motor?
(a) To provide mechanical support
(b) To maintain electrical contact
(c) To increase magnetic field strength
(d) To regulate the voltage
Show Answer
To maintain electrical contact
58. What role does the commutator play in the rotation of the coil in a DC motor?
(a) It controls the torque of the motor
(b) It adjusts the speed of rotation
(c) It reverses the direction of current in the coil
(d) It aligns with the magnetic field
Show Answer
It reverses the direction of current in the coil
59. How does the commutator contribute to continuous rotation in a DC motor?
(a) By changing the magnetic field polarity
(b) By reversing the direction of current at specific points
(c) By regulating the power supply voltage
(d) By synchronizing with external forces
Show Answer
By reversing the direction of current at specific points
60. What happens when the gaps in the commutator align with the brushes in a DC motor?
(a) Current starts flowing in the coil
(b) Current stops flowing in the coil
(c) The coil rotates counterclockwise
(d) The coil becomes stationary
Show Answer
Current stops flowing in the coil
61. What is the phenomenon called when a current is induced in a wire loop by a changing magnetic field?
(a) Electromagnetic Radiation
(b) Magnetic Resonance
(c) Electromagnetic Induction
(d) Electric Conduction
Show Answer
Electromagnetic Induction
62. What induces an electromotive force (emf) in a wire?
(a) Static Magnetic Field
(b) Changing Magnetic Field
(c) Electric Charge
(d) Stationary Conductor
Show Answer
Changing Magnetic Field
63. What term is used to describe the current induced by a changing magnetic field in a circuit?
(a) Static Current
(b) Conduction Current
(c) Induced Current
(d) Battery Current
Show Answer
Induced Current
64. What happens to the galvanometer when a magnet is stationary inside the coil?
(a) Shows current in one direction
(b) Shows no current
(c) Shows current in the opposite direction
(d) Shows alternating current
Show Answer
Shows no current
65. What does a steady current in the primary coil produce?
(a) Steady magnetic field
(b) Alternating magnetic field
(c) No magnetic field
(d) Steady electric field
Show Answer
Steady magnetic field
66. What effect does increasing the number of turns in a coil have on the induced electromotive force (e.m.f.)?
(a) No effect
(b) Decreases the e.m.f
(c) Increases the e.m.f
(d) Causes fluctuations in e.m.f
Show Answer
Increases the e.m.f
67. How does the speed of a conductor moving through a magnetic field relate to the induced e.m.f.?
(a) Speed has no effect on e.m.f
(b) Higher speed decreases e.m.f
(c) Higher speed increases e.m.f
(d) Speed causes random variations in e.m.f
Show Answer
Higher speed increases e.m.f
68. What is the relationship between the length of a conductor in a magnetic field and the induced e.m.f.?
(a) No correlation
(b) Longer length decreases e.m.f
(c) Length has an unpredictable effect on e.m.f
(d) Longer length increases e.m.f
Show Answer
Longer length increases e.m.f
69. How does the size of the magnetic field impact the induced e.m.f.?
(a) Magnetic field size is irrelevant
(b) Larger field decreases e.m.f
(c) Larger field increases e.m.f
(d) Magnetic field size causes oscillations in e.m.f
Show Answer
Larger field increases e.m.f
70. How does the induced magnetic field created by the loop relate to the external magnetic field during the process of pushing a bar magnet’s North pole into the loop?
(a) Same direction
(b) Opposite direction
(c) Perpendicular direction
(d) No relationship
Show Answer
Opposite direction
71. What happens to the energy spent in overcoming the opposition of the induced magnetic field during the motion of the magnet?
(a) Converted into electrical energy
(b) Lost as heat
(c) Converted into mechanical energy
(d) No energy transformation occurs
Show Answer
Converted into electrical energy
72. What is the primary function of an electricity generator?
(a) Converts electrical energy into mechanical energy
(b) Converts mechanical energy into electrical energy
(c) Stores electrical energy
(d) Produces magnetic fields
Show Answer
Converts mechanical energy into electrical energy
73. Which principle is employed in the generation of electricity by a generator?
(a) Ohm’s Law
(b) Faraday’s Law of Electromagnetic Induction
(c) Newton’s Law of Motion
(d) Coulomb’s Law
Show Answer
Faraday’s Law of Electromagnetic Induction
74. In an AC generator, what type of energy is initially converted into electrical energy?
(a) Thermal energy
(b) Nuclear energy
(c) Mechanical energy
(d) Chemical energy
Show Answer
Mechanical energy
75. How is the generation of direct current (DC) achieved in a generator?
(a) By using slip rings and brushes
(b) By employing a commutator (split ring)
(c) By rotating the coil in a static magnetic field
(d) By utilizing a permanent magnet
Show Answer
By employing a commutator (split ring)
76. What modification is required to produce alternating current (AC) in a generator?
(a) Adding more coils to the rotor
(b) Using a stronger permanent magnet
(c) Replacing the rotor with a stator
(d) Employing slip rings and brushes
Show Answer
Employing slip rings and brushes
77. In an AC generator, what component is responsible for changing the direction of induced current continuously?
(a) Rotor shaft
(b) Commutator
(c) Permanent magnet
(d) Slip rings
Show Answer
Slip rings
78. What type of current does a DC generator produce?
(a) Alternating current (AC)
(b) Pulsating current
(c) Direct current (DC)
(d) Oscillating current
Show Answer
Direct current (DC)
79. What is the phenomenon described as the induction of electromotive force (emf) in one circuit or coil due to the change in current in another circuit or coil?
(a) Self-induction
(b) Mutual induction
(c) Electromagnetic induction
(d) Faraday’s induction
Show Answer
Mutual induction
80. In mutual induction, what is the role of the coil connected to a battery?
(a) Secondary coil
(b) Tertiary coil
(c) Primary coil
(d) Inductive coil
Show Answer
Primary coil
81. What is the purpose of the iron core in the mutual induction setup?
(a) Increases electrical resistance
(b) Decreases magnetic field
(c) Enhances the magnetic field
(d) Isolates the coils
Show Answer
Enhances the magnetic field
82. Which term is used for the coil that has no source of electromotive force (emf) in mutual induction?
(a) Primary coil
(b) Tertiary coil
(c) Secondary coil
(d) Passive coil
Show Answer
Secondary coil
83. What is the mathematical expression for the induced emf in the secondary coil (E_s) in terms of mutual induction (M) and the rate of change of current in the primary coil (\frac{\Delta I}{\Delta t}) ?
(a) E_s = \frac{L \Delta I}{ \Delta t}
(b) E_s = - L \frac{\Delta I}{\Delta t}
(c) E_s = M \frac{\Delta I}{\Delta t}
(d) E_s = -M \frac{\Delta I}{\Delta t}
Show Answer
E_s = -M \frac{\Delta I}{\Delta t}
84. What is the unit of mutual induction?
(a) Volt (V)
(b) Ampere (A)
(c) Henry (H)
(d) Second (s)
Show Answer
Henry (H)
85. How is 1 Henry defined in terms of electrical quantities?
(a) 1 H = 1 V.s / 1 A
(b) 1 H = 1 W / 1 C
(c) 1 H = 1 J / 1 C
(d) 1 H = 1 V × 1 s
Show Answer
1 H = 1 V.s / 1 A
86. If the coefficient of mutual induction is doubled while the rate of change of current in the primary remains constant, what happens to the induced emf in the secondary coil?
(a) It doubles
(b) It halves
(c) It remains the same
(d) It becomes zero
Show Answer
It doubles
87. If the current is changing at the rate of 2 amperes per second in the primary coil, what would be the magnitude of induced emf in the secondary coil if the coefficient of mutual induction is 0.5 H?
(a) 1 V
(b) 0.5 V
(c) 2 V
(d) 4 V
Show Answer
1 V
88. If the induced emf (E_s) is 4 V, the change in time (\Delta t) \ is \ 2 \ s , and the mutual induction (M) is 4 H, what is the change in current (\Delta I) ?
(a) -2 \ A
(b) -6 \ A
(c) 6 \ A
(d) 2 \ A
Show Answer
-2 \ A
89. If the induced emf (E_s) is 10 V, the change in current ( \Delta I) \ is \ -3 \ A , and the mutual induction (M) is 5 H, what is the change in time (\Delta t) ?
(a) -2 s
(b) 2 s
(c) -1.5 s
(d) 1.5 s
Show Answer
1.5 s
90. If the induced emf (Es) is 12 V, the change in current (\Delta I) \ is \ -4 \ A , and the change in time (\Delta y) \ is \ 3 \ s , what is the mutual induction (M) between the coils?
(a) -9 \ H
(b) 9 \ H
(c) -4 \ H
(d) 4 \ H
Show Answer
9 \ H
91. What is the primary function of a transformer?
(a) Generate DC voltage
(b) Store electrical energy
(c) Increase or decrease AC voltage or current
(d) Convert mechanical energy to electrical energy
Show Answer
Increase or decrease AC voltage or current
92. What is the underlying principle of a transformer?
(a) Electromagnetic radiation
(b) Mutual induction
(c) Self-Induction
(d) Ohm’s Law
Show Answer
Mutual induction
93. What are the key components of a transformer?
(a) Diodes and resistors
(b) Capacitors and inductors
(c) Two coils or windings and a core
(d) Transistors and relays
Show Answer
Two coils or windings and a core
94. What is the purpose of the core in a transformer?
(a) To enhance resistance
(b) To provide electrical insulation
(c) To store electrical charge
(d) To maximize mutual inductance
Show Answer
To maximize mutual inductance
95. Which type of current is primarily involved in the operation of a transformer?
(a) Direct Current (DC)
(b) Alternating Current (AC)
(c) Pulsating Current
(d) Steady Current
Show Answer
Alternating Current (AC)
96. What is the winding from which power is supplied called in a transformer?
(a) Primary
(b) Secondary
(c) Tertiary
(d) Auxiliary
Show Answer
Primary
97. What is the winding from which power is drawn called in a transformer?
(a) Primary
(b) Secondary
(c) Tertiary
(d) Auxiliary
Show Answer
Secondary
98. In a step-up transformer, which coil has more turns?
(a) Primary coil
(b) Secondary coil
(c) Both have the same number of turns
(d) It depends on the specific transformer
Show Answer
Secondary coil
99. In a step-down transformer, which coil has more turns?
(a) Primary coil
(b) Secondary coil
(c) Both have the same number of turns
(d) It depends on the specific transformer
Show Answer
Primary coil
100. If the turns ratio (N_s / N_p) is greater than 1, what type of transformer is it?
(a) Step-up transformer
(b) Step-down transformer
(c) Isolation transformer
(d) Autotransformer
Show Answer
Step-up transformer
101. If the turns ratio (\frac{N_s}{N_p}) is less than 1, what type of transformer is it?
(a) Step-up transformer
(b) Step-down transformer
(c) Isolation transformer
(d) Autotransformer
Show Answer
Step-down transformer
102. What is the relationship between the secondary (output) voltage (V_2) and primary (input) voltage (V_1) in a step-up transformer?
(a) V_2 = V_1
(b) V_2 < V_1
(c) V_2 > V_1
(d) V_2 is unrelated to V_1
Show Answer
V_2 > V_1
103. What is the relationship between the secondary (output) voltage (V_2) and primary (input) voltage (V_1) in a step-down transformer?
(a) V_2 = V_1
(b) V_2 < V_1
(c) V_2 > V_1
(d) V_2 is unrelated to V_1
Show Answer
V_2 < V_1
104. For a step-down transformer with a turns ratio of 1:3 , what can be concluded about the secondary voltage compared to the primary voltage?
(a) V_2 = V_1
(b) V_2 > V_1
(c) V_2 < V_1
(d) V_2 is unrelated to V_1
Show Answer
V_2 < V_1
105. If the turns ratio is 2:1 , what type of transformer is it?
(a) Step-up transformer
(b) Step-down transformer
(c) Isolation transformer
(d) Autotransformer
Show Answer
Step-up transformer
106. If the turns ratio is 1:2 , what type of transformer is it?
(a) Step-up transformer
(b) Step-down transformer
(c) Isolation transformer
(d) Autotransformer
Show Answer
Step-down transformer
107. How is the turns ratio related to the number of turns in the primary (N_1) and secondary (N_2) coils?
(a) N_1 \times N_2
(b) \frac{N_1}{N_2}
(c) \frac{N_2}{N_1}
(d) None of these
Show Answer
\frac{N_2}{N_1}
108. What is the primary purpose of transformers?
(a) To increase power loss
(b) To reduce voltage levels
(c) To enhance resistive heating
(d) To efficiently transmit electricity over long distances
Show Answer
To efficiently transmit electricity over long distances
109. What is the final voltage before domestic use?
(a) 13,000 V
(b) 500,000 V
(c) 11,000 V
(d) 240 V
Show Answer
240 V
110. A transformer has 500 turns in its primary winding and 2500 turns in its secondary winding. If the primary voltage is 120V, what is the secondary voltage?
(a) 24V
(b) 240V
(c) 600V
(d) 720V
Show Answer
600V
111. A transformer has a turns ratio of 1:10 . If the primary voltage is 80V, what is the secondary voltage?
(a) 8V
(b) 40V
(c) 80V
(d) 800V
Show Answer
8V
112. If a transformer has 600 turns in its primary winding and 300 turns in its secondary winding, and the primary voltage is 240V, what is the secondary voltage?
(a) 120V
(b) 240V
(c) 480V
(d) 960V
Show Answer
120V
113. The turns ratio of a transformer is 1:5 , and the secondary voltage is 200V. What is the primary voltage?
(a) 400V
(b) 500V
(c) 1000V
(d) 2000V
Show Answer
1000V
114. A transformer has a turns ratio of 1:8 . If the secondary voltage is 320V, what is the primary voltage?
(a) 140V
(b) 880V
(c) 1160V
(d) 2560V
Show Answer
2560V
115. If a transformer has 1200 turns in its primary winding and 150 turns in its secondary winding, and the primary voltage is 240V, what is the secondary voltage?
(a) 18V
(b) 30V
(c) 300V
(d) 500V
Show Answer
30V
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