Magnetic Effects of Electric Current class 10 Important MCQ

Introduction:

        विद्युत धारा के चुंबकीय प्रभाव (Magnetic Effects of Electric Current) का अध्याय यह समझने में मदद करता है कि जब किसी चालक (Conductor) में विद्युत धारा (Electricity) प्रवाहित होती है, तो उसके आसपास चुंबकीय क्षेत्र (Magnetic Field) उत्पन्न होता है। इस अध्याय में चुंबकीय क्षेत्र रेखाएँ (Magnetic Field Lines), दाहिने हाथ का अंगूठा नियम (Right Hand Thumb Rule), विद्युत चुंबक (Electromagnet), सोलोनॉइड (Solenoid) जैसे महत्वपूर्ण विषय शामिल हैं। महत्वपूर्ण MCQs (बहुविकल्पीय प्रश्न) का अभ्यास करने से छात्रों को इन अवधारणाओं की गहरी समझ विकसित करने, लॉजिकल सोच बढ़ाने और परीक्षा की बेहतर तैयारी करने में सहायता मिलती है। ये प्रश्न थ्योरी और एप्लीकेशन दोनों पर आधारित होते हैं।

1. The magnetic field around a current carrying conductor was discovered by
   A) Faraday
   B) Fleming
   C) Oersted
   D) Maxwell
   Ans: C
2. The direction of magnetic field around a straight conductor is given by
   A) Fleming’s left-hand rule
   B) Fleming’s right-hand rule
   C) Right-hand thumb rule
   D) Maxwell’s rule
   Ans: C
3. SI unit of magnetic field is
   A) Tesla
   B) Weber
   C) Ampere
   D) Ohm
   Ans: A
4. A magnetic field is strongest at
   A) Centre of magnet
   B) Poles of magnet
   C) Middle of conductor
   D) Uniform everywhere
   Ans: B
5. Magnetic field lines never
   A) Intersect
   B) Bend
   C) Form closed loops
   D) Spread
   Ans: A
6. The device used to measure electric current is
   A) Voltmeter
   B) Galvanometer
   C) Ammeter
   D) Multimeter
   Ans: C
7. The magnetic field around a current-carrying straight conductor consists of
   A) Straight lines
   B) Elliptical lines
   C) Circular lines
   D) Parabolic lines
   Ans: C
8. Increase in current causes magnetic field to
   A) Decrease
   B) Increase
   C) Remain same
   D) Disappear
   Ans: B
9. Magnetic field inside a solenoid is
   A) Zero
   B) Non-uniform
   C) Uniform
   D) Weak
   Ans: C
10. A solenoid behaves like a
    A) Resistor
    B) Magnet
    C) Capacitor
    D) Fuse
    Ans: B
11. The magnetic field produced by an electromagnet depends on
    A) Current
    B) Number of turns
    C) Core material
    D) All of these
    Ans: D
12. Fleming’s left-hand rule is used to find
    A) Direction of current
    B) Direction of force
    C) Direction of field
    D) Direction of charge
    Ans: B
13. Fleming’s right-hand rule is used in
    A) Motor
    B) Generator
    C) Transformer
    D) Battery
    Ans: B
14. The force on a current carrying conductor in a magnetic field increases with
    A) Decrease in current
    B) Increase in current
    C) Increase in resistance
    D) Decrease in length
    Ans: B
15. Which device converts electrical energy into mechanical energy?
    A) Generator
    B) Motor
    C) Transformer
    D) Rectifier
    Ans: B
16. The principle of electric motor is based on
    A) Electrostatics
    B) Heating effect
    C) Magnetic effect
    D) Chemical effect
    Ans: C
17. Which part of motor reverses current direction?
    A) Coil
    B) Magnet
    C) Split ring
    D) Brush
    Ans: C
18. An electric generator works on the principle of
    A) Electromagnetic induction
    B) Heating effect
    C) Chemical reaction
    D) Static electricity
    Ans: A
19. DC generator gives
    A) Alternating current
    B) Direct current
    C) Pulsating current
    D) Zero current
    Ans: B
20. AC generator uses
    A) Split ring
    B) Commutator
    C) Slip rings
    D) Brushes only
    Ans: C

21. The core of an electromagnet is made of
    A) Steel
    B) Soft iron
    C) Copper
    D) Aluminium
    Ans: B
22. Which rule gives direction of induced current?
    A) Right-hand thumb rule
    B) Fleming’s right-hand rule
    C) Fleming’s left-hand rule
    D) Maxwell’s rule
    Ans: B
23. Magnetic field lines emerge from
    A) South pole
    B) North pole
    C) Centre
    D) All directions
    Ans: B
24. Unit of current is
    A) Volt
    B) Coulomb
    C) Ampere
    D) Ohm
    Ans: C
25. The magnetic field inside a current-carrying loop is
    A) Zero
    B) Weak
    C) Strong and uniform
    D) Random
    Ans: C
26. Which material is used for permanent magnets?
    A) Soft iron
    B) Steel
    C) Copper
    D) Aluminium
    Ans: B
27. The direction of force depends on
    A) Direction of current
    B) Direction of field
    C) Both A & B
    D) Length only
    Ans: C
28. Which effect is maximum?
    A) Parallel conductor
    B) Perpendicular conductor
    C) Inclined conductor
    D) No current
    Ans: B
29. Generator converts
    A) Mechanical → Electrical
    B) Electrical → Mechanical
    C) Heat → Electrical
    D) Light → Electrical
    Ans: A
30. A moving coil galvanometer is used to measure
    A) Voltage
    B) Resistance
    C) Small currents
    D) Power
    Ans: C
31. Slip rings are used in
    A) DC motor
    B) AC generator
    C) DC generator
    D) Transformer
    Ans: B
32. Which increases strength of electromagnet?
    A) Decreasing turns
    B) Increasing current
    C) Using steel core
    D) Decreasing current
    Ans: B
33. Magnetic field is a
    A) Scalar quantity
    B) Vector quantity
    C) Zero quantity
    D) Constant quantity
    Ans: B
34. The SI unit of magnetic flux is
    A) Tesla
    B) Weber
    C) Ampere
    D) Ohm
    Ans: B
35. The brushes in motor are made of
    A) Copper
    B) Iron
    C) Carbon
    D) Aluminium
    Ans: C
36. Which law explains electromagnetic induction?
    A) Ohm’s law
    B) Faraday’s law
    C) Newton’s law
    D) Ampere’s law
    Ans: B
37. The magnetic field around a solenoid resembles
    A) Bar magnet
    B) Circular loop
    C) Straight conductor
    D) Ring magnet
    Ans: A
38. The magnetic field strength is zero at
    A) Poles
    B) Centre of bar magnet
    C) Outside magnet
    D) Everywhere
    Ans: B
39. Which rule is also called Maxwell’s right-hand thumb rule?
    A) Fleming’s left hand
    B) Fleming’s right hand
    C) Right-hand thumb rule
    D) Corkscrew rule
    Ans: C
40. The induced current flows only when
    A) Coil is stationary
    B) Magnetic field changes
    C) Current is constant
    D) Resistance is zero
    Ans: B

41. Magnetic field lines are denser where field is
    A) Weak
    B) Zero
    C) Strong
    D) Uniform
    Ans: C
42. The direction of magnetic field inside solenoid is from
    A) S to N
    B) N to S
    C) Upward
    D) Downward
    Ans: B
43. Which is not used in motor?
    A) Armature
    B) Magnet
    C) Commutator
    D) Slip ring
    Ans: D
44. An electromagnet loses magnetism when
    A) Current flows
    B) Current stops
    C) Core is steel
    D) Turns increase
    👉 Ans: B
45. Magnetic field due to current depends on
    A) Distance
    B) Current
    C) Shape
    D) All of these
    Ans: D
46. Which has no magnetic field?
    A) Moving charge
    B) Current-carrying wire
    C) Stationary charge
    D) Solenoid
    Ans: C
47. Magnetic field at centre of circular loop is
    A) Zero
    B) Maximum
    C) Minimum
    D) Variable
    Ans: B
48. Unit of induced EMF is
    A) Tesla
    B) Weber
    C) Volt
    D) Ampere
    Ans: C
49. Induced current opposes cause producing it (law of)
    A) Ohm
    B) Lenz
    C) Fleming
    D) Faraday
    Ans: B
50. Which quantity is not affected by magnetic field?
    A) Moving charge
    B) Stationary charge
    C) Current
    D) Direction
    Ans: B
51. Direction of field can be changed by
    A) Reversing current
    B) Increasing length
    C) Increasing resistance
    D) Decreasing turns
    Ans: A
52. Which energy conversion occurs in motor?
    A) Electrical → Mechanical
    B) Mechanical → Electrical
    C) Heat → Mechanical
    D) Light → Electrical
    Ans: A
53. Which is used to increase voltage?
    A) Motor
    B) Generator
    C) Step-up transformer
    D) Step-down transformer
    Ans: C
54. Magnetic field lines inside a bar magnet are
    A) Straight
    B) Circular
    C) From S to N
    D) From N to S
    Ans: C
55. Field lines outside magnet go from
    A) S to N
    B) N to S
    C) Centre to poles
    D) Random
    Ans: B
56. Which does not produce magnetic field?
    A) Moving electron
    B) AC current
    C) DC current
    D) Stationary electron
    Ans: D
57. The strength of electromagnet depends on
    A) Current
    B) Turns
    C) Core
    D) All
    Ans: D
58. Galvanometer can be converted into
    A) Voltmeter
    B) Ammeter
    C) Both
    D) None
    Ans: C
59. The field around straight conductor decreases with
    A) Increase in current
    B) Increase in distance
    C) Increase in turns
    D) Increase in voltage
    Ans: B
60. The magnetic field direction is given by
    A) Right hand thumb rule
    B) Fleming’s left hand
    C) Fleming’s right hand
    D) Ohm’s law
    Ans: A

61. Core of transformer is made of
    A) Steel
    B) Soft iron
    C) Copper
    D) Aluminium
    Ans: B
62. Magnetic effect of current is used in
    A) Fuse
    B) Heater
    C) Electric bell
    D) Bulb
    Ans: C
63. The SI unit of current density is
    A) A
    B) A/m²
    C) V/m
    D) T
    Ans: B
64. Which is temporary magnet?
    A) Steel magnet
    B) Electromagnet
    C) Bar magnet
    D) Horseshoe magnet
    Ans: B
65. Magnetic field lines form
    A) Open curves
    B) Closed curves
    C) Straight lines
    D) Broken lines
    Ans: B
66. Generator produces current by
    A) Rotation of coil
    B) Heating effect
    C) Chemical reaction
    D) Battery
     Ans: A
67. Which law explains induced EMF?
    A) Lenz’s law
    B) Faraday’s law
    C) Fleming’s rule
    D) Ohm’s law
    Ans: B
68. Magnetic field is zero at
    A) Poles
    B) Neutral point
    C) Centre of magnet
    D) Ends
    Ans: B
69. Increasing turns in solenoid increases
    A) Resistance
    B) Magnetic field
    C) Voltage
    D) Power
    Ans: B
70. The force on conductor is zero when it is
    A) Parallel to field
    B) Perpendicular to field
    C) Inclined
    D) Moving
    Ans: A
71. DC motor uses
    A) Slip rings
    B) Split rings
    C) Transformer
    D) Generator
    Ans: B
72. Which effect is used in loudspeaker?
    A) Heating
    B) Chemical
    C) Magnetic
    D) Electrostatic
    Ans: C
73. Electromagnetic induction occurs when
    A) Current changes
    B) Magnetic field changes
    C) Resistance changes
    D) Temperature changes
    Ans: B
74. Which is not a magnetic material?
    A) Iron
    B) Nickel
    C) Cobalt
    D) Copper
    Ans: D
75. Magnetic field is strongest where lines are
    A) Far apart
    B) Close together
    C) Parallel
    D) Circular
    Ans: B
76. Which increases magnetic field strength?
    A) Decreasing current
    B) Increasing distance
    C) Increasing current
    D) Decreasing turns
    Ans: C
77. Which is correct about solenoid?
    A) No field inside
    B) Uniform field inside
    C) Weak field inside
    D) Random field
    Ans: B
78. Magnetic field around a magnet can be shown using
    A) Iron filings
    B) Plastic
    C) Wood
    D) Paper
    Ans: A
79. Which rule is used in motor?
    A) Fleming’s left hand
    B) Fleming’s right hand
    C) Right-hand thumb
    D) Lenz’s law
    Ans: A
80. Induced current is maximum when rate of change of flux is
    A) Minimum
    B) Zero
    C) Maximum
    D) Constant
    Ans: C

81. Magnetic field inside solenoid is
    A) Weak
    B) Zero
    C) Uniform
    D) Irregular
    Ans: C
82. The poles of electromagnet depend on
    A) Direction of current
    B) Number of turns
    C) Core material
    D) Resistance
    Ans: A
83. SI unit of magnetic moment is
    A) A m²
    B) Tesla
    C) Weber
    D) Ampere
    Ans: A
84. A magnetic compass works on
    A) Electrostatic principle
    B) Magnetic effect
    C) Heating effect
    D) Chemical effect
    Ans: B
85. Which has strongest magnetic field?
    A) Bar magnet
    B) Electromagnet
    C) Soft iron
    D) Steel rod
    Ans: B
86. Direction of induced current is given by
    A) Fleming’s left hand
    B) Fleming’s right hand
    C) Lenz’s law
    D) Ohm’s law
    Ans: C
87. Magnetic field depends on
    A) Current
    B) Distance
    C) Medium
    D) All
    Ans: D
88. Field lines inside magnet go from
    A) N to S
    B) S to N
    C) Centre to ends
    D) Random
    Ans: B
89. Which device uses electromagnetic induction?
    A) Motor
    B) Generator
    C) Heater
    D) Bulb
    Ans: B
90. Strength of magnetic field increases if
    A) Current increases
    B) Distance decreases
    C) Turns increase
    D) All of these
    Ans: D
91. Magnetic field lines show
    A) Direction only
    B) Strength only
    C) Both direction and strength
    D) None
    Ans: C
92. The magnetic field due to current was discovered in
    A) 1800
    B) 1820
    C) 1850
    D) 1900
    Ans: B
93. Which converts AC to DC?
    A) Generator
    B) Rectifier
    C) Transformer
    D) Motor
    Ans: B
94. Which quantity is vector?
    A) Current
    B) Charge
    C) Magnetic field
    D) Resistance
    Ans: C
95. Neutral point is where
    A) Field is strongest
    B) Field is zero
    C) Poles meet
    D) Current stops
    Ans: B
96. Magnetic field around straight conductor is
    A) Radial
    B) Circular
    C) Straight
    D) Elliptical
    Ans: B
97. Which is used to reverse current in motor?
    A) Brush
    B) Coil
    C) Split ring
    D) Magnet
    Ans: C
98. Which material is best for electromagnet core?
    A) Steel
    B) Copper
    C) Soft iron
    D) Aluminium
    Ans: C
99. Magnetic field due to current is proportional to
    A) Distance
    B) Current
    C) Resistance
    D) Voltage
    Ans: B
100. The magnetic effect of current proves that
     A) Current produces heat
     B) Current produces magnetism
     C) Current produces light
     D) Current produces sound
     Ans: B

Conclusion:

            अंत में, Magnetic Effects of Electric Current के महत्वपूर्ण MCQs का नियमित अभ्यास छात्रों के लिए अत्यंत लाभदायक है। इससे न केवल महत्वपूर्ण टॉपिक्स का रिवीजन होता है, बल्कि प्रश्नों को जल्दी और सही तरीके से हल करने की क्षमता भी बढ़ती है। सही रणनीति और निरंतर अभ्यास के साथ छात्र इस अध्याय में मजबूत पकड़ बना सकते हैं और परीक्षा में अच्छे अंक प्राप्त कर सकते हैं।

 Read also : Magnetic Effects of Electric Current class 10 Notes

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