Chapter 13 – Magnetic Effects of Electric Current – MCQs
Chapter 13 – Magnetic Effects of Electric Current – MCQs (Part 1: Q1–Q25)
Q1. The magnetic field produced around a current-carrying conductor is due to:
a) Motion of protons
b) Motion of neutrons
c) Motion of electrons
d) Stationary charges
✅ Answer: c) Motion of electrons
Explanation: A current is the flow of electrons. Moving charges produce magnetic fields.
Q2. The direction of the magnetic field around a straight current-carrying conductor is determined by:
a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Right-hand thumb rule
d) Maxwell’s corkscrew rule
✅ Answer: c) Right-hand thumb rule
Explanation: Curl the fingers of the right hand around the wire; thumb points in current direction and fingers show magnetic field direction.
Q3. What happens to the strength of the magnetic field inside a solenoid when current increases?
a) Decreases
b) Increases
c) Remains constant
d) First increases, then decreases
✅ Answer: b) Increases
Explanation: Magnetic field inside a solenoid is directly proportional to current.
Q4. Which instrument is used to detect the presence of current in a conductor?
a) Voltmeter
b) Ammeter
c) Galvanometer
d) Ohmmeter
✅ Answer: c) Galvanometer
Explanation: A galvanometer detects weak currents through deflection of its needle.
Q5. The magnetic field lines inside a solenoid are:
a) Curved
b) Circular
c) Straight and parallel
d) Irregular
✅ Answer: c) Straight and parallel
Explanation: Inside a solenoid, the field is uniform with parallel lines, similar to a bar magnet.
Q6. The strength of the magnetic field produced by a current-carrying straight conductor depends on:
a) Current only
b) Distance from conductor
c) Both current and distance
d) Resistance of conductor
✅ Answer: c) Both current and distance
Explanation: The field increases with current and decreases with distance from the conductor.
Q7. The magnetic field due to a current in a straight wire is in the form of:
a) Straight lines
b) Concentric circles
c) Zig-zag lines
d) Parallel lines
✅ Answer: b) Concentric circles
Explanation: Around a straight conductor, magnetic field lines form concentric circles.
Q8. Which rule is used to find the direction of force on a current-carrying conductor in a magnetic field?
a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Ampere’s rule
d) Maxwell’s rule
✅ Answer: a) Fleming’s left-hand rule
Explanation: Left-hand rule gives direction of force when a current-carrying conductor is placed in a magnetic field.
Q9. A current-carrying conductor placed perpendicular to magnetic field experiences:
a) No force
b) Minimum force
c) Maximum force
d) Infinite force
✅ Answer: c) Maximum force
Explanation: The force is maximum when conductor is perpendicular to magnetic field.
Q10. The force on a current-carrying conductor in a magnetic field is given by:
a) F = BIL
b) F = qvB
c) F = I²R
d) F = VIt
✅ Answer: a) F = BIL
Explanation: Force depends on magnetic field (B), current (I), and length of conductor (L).
Q11. The north pole of a magnet can be defined as the pole which:
a) Points towards geographic north
b) Points towards geographic south
c) Attracts north pole of Earth
d) Repels south pole of Earth
✅ Answer: a) Points towards geographic north
Explanation: By convention, the pole pointing northwards is called magnetic north.
Q12. The pattern of magnetic field lines inside a solenoid resembles that of:
a) A straight conductor
b) A circular coil
c) A bar magnet
d) A permanent magnet
✅ Answer: c) A bar magnet
Explanation: A solenoid behaves like a bar magnet with poles at its ends.
Q13. The strength of the magnetic field inside a solenoid increases when:
a) Number of turns is decreased
b) Current is decreased
c) Number of turns per unit length is increased
d) Length is increased
✅ Answer: c) Number of turns per unit length is increased
Explanation: More turns per unit length strengthen the magnetic field.
Q14. The direction of induced current in a coil is given by:
a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Ampere’s circuital law
d) Right-hand thumb rule
✅ Answer: b) Fleming’s right-hand rule
Explanation: Fleming’s right-hand rule gives the direction of induced current when conductor moves in a magnetic field.
Q15. The unit of magnetic field (B) is:
a) Tesla
b) Weber
c) Gauss
d) Ampere
✅ Answer: a) Tesla
Explanation: SI unit of magnetic field is Tesla (T).
Q16. The direction of magnetic field lines inside a bar magnet is:
a) From north to south
b) From south to north
c) Circular
d) Random
✅ Answer: b) From south to north
Explanation: Inside a magnet, field lines move from south to north; outside they move north to south.
Q17. Electromagnets are used in:
a) Electric bell
b) Loudspeaker
c) Motors
d) All of these
✅ Answer: d) All of these
Explanation: Electromagnets are widely used in bells, speakers, and motors.
Q18. The phenomenon of magnetic field production by current is called:
a) Magnetic induction
b) Electromagnetism
c) Magnetization
d) Magnetic effect
✅ Answer: b) Electromagnetism
Explanation: Oersted discovered electromagnetism: current produces a magnetic field.
Q19. Which scientist discovered the magnetic effect of current?
a) Faraday
b) Oersted
c) Fleming
d) Maxwell
✅ Answer: b) Oersted
Explanation: Hans Christian Oersted discovered that current through a wire produces a magnetic field.
Q20. Which factor increases the force on a conductor in a magnetic field?
a) Decreasing current
b) Increasing length of conductor
c) Decreasing magnetic field
d) Making conductor parallel to field
✅ Answer: b) Increasing length of conductor
Explanation: Force ∝ BIL. Longer conductor in field = more force.
Q21. The device that converts electrical energy into mechanical energy is:
a) Generator
b) Transformer
c) Electric motor
d) Galvanometer
✅ Answer: c) Electric motor
Explanation: Motor works on the principle of force on a current-carrying conductor in a magnetic field.
Q22. In a motor, the commutator is used to:
a) Increase speed
b) Reverse direction of current
c) Reduce current
d) Strengthen field
✅ Answer: b) Reverse direction of current
Explanation: Commutator reverses current in armature to ensure continuous rotation.
Q23. Which of the following statements about magnetic field lines is correct?
a) They intersect each other
b) They are closed curves
c) They start from south pole
d) They end inside magnet
✅ Answer: b) They are closed curves
Explanation: Magnetic field lines are continuous closed loops.
Q24. In Fleming’s left-hand rule, which finger represents the direction of current?
a) Thumb
b) First finger
c) Middle finger
d) Ring finger
✅ Answer: c) Middle finger
Explanation: Thumb = Force, First finger = Field, Middle finger = Current.
Q25. The magnetic field is stronger at:
a) The center of a circular coil
b) Edges of a coil
c) Middle of a straight conductor
d) At large distance from conductor
✅ Answer: a) The center of a circular coil
Explanation: Field lines are concentrated at the center, hence strongest there.
Magnetic Effects of Electric Current – MCQs (Part 2: Q26–Q50)
Q26. In Fleming’s left-hand rule, the thumb represents:
a) Direction of current
b) Direction of magnetic field
c) Direction of force (motion)
d) Direction of voltage
✅ Answer: c) Direction of force (motion)
Explanation: In Fleming’s left-hand rule: Thumb = Force, First finger = Field, Middle finger = Current.
Q27. The magnetic field around a circular loop carrying current is strongest at:
a) At the center of the loop
b) On the wire itself
c) Outside the loop
d) At infinity
✅ Answer: a) At the center of the loop
Explanation: Magnetic field lines are concentrated and strongest at the center of the loop.
Q28. Increasing the number of turns in a coil will:
a) Decrease magnetic field strength
b) Increase magnetic field strength
c) Have no effect
d) Reverse field direction
✅ Answer: b) Increase magnetic field strength
Explanation: Magnetic field strength is proportional to number of turns × current.
Q29. A soft iron core placed inside a solenoid:
a) Decreases the field strength
b) Increases the field strength
c) Has no effect
d) Reverses polarity
✅ Answer: b) Increases the field strength
Explanation: The soft iron core becomes magnetized and strengthens the field, forming an electromagnet.
Q30. The force on a current-carrying conductor in a magnetic field is zero when:
a) Conductor is parallel to field
b) Conductor is perpendicular to field
c) Current is high
d) Field is strong
✅ Answer: a) Conductor is parallel to field
Explanation: Force = BIL sinθ. If θ = 0° (parallel), sinθ = 0, so force = 0.
Q31. Which of the following rules explains the direction of induced current?
a) Right-hand thumb rule
b) Fleming’s right-hand rule
c) Fleming’s left-hand rule
d) Ampere’s rule
✅ Answer: b) Fleming’s right-hand rule
Explanation: Fleming’s right-hand rule gives the direction of induced current in generators.
Q32. The magnetic field inside a long solenoid is:
a) Zero
b) Weak and non-uniform
c) Strong and uniform
d) Only at the edges
✅ Answer: c) Strong and uniform
Explanation: A solenoid produces a uniform magnetic field inside, similar to a bar magnet.
Q33. The function of a split-ring commutator in an electric motor is to:
a) Reduce resistance
b) Reverse current direction
c) Supply constant current
d) Increase current
✅ Answer: b) Reverse current direction
Explanation: Commutator ensures the current reverses every half turn, keeping motor rotation continuous.
Q34. Who discovered electromagnetic induction?
a) Oersted
b) Faraday
c) Maxwell
d) Fleming
✅ Answer: b) Faraday
Explanation: Michael Faraday discovered that changing magnetic field induces current in a conductor.
Q35. The magnetic field lines around a straight current-carrying conductor can be observed using:
a) Magnetic compass
b) Galvanometer
c) Ammeter
d) Voltmeter
✅ Answer: a) Magnetic compass
Explanation: A compass needle placed near the wire shows the direction of the magnetic field.
Q36. Which of the following statements about magnetic field lines is incorrect?
a) They form closed loops
b) They never intersect each other
c) They always run from south to north outside the magnet
d) They are closer where the field is stronger
✅ Answer: c) They always run from south to north outside the magnet
Explanation: Outside a magnet, they run from north to south, not south to north.
Q37. In an electric motor, the direction of rotation of the coil is given by:
a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Ampere’s rule
d) Right-hand thumb rule
✅ Answer: a) Fleming’s left-hand rule
Explanation: It gives the direction of force on a current-carrying conductor in a magnetic field.
Q38. The magnetic field around a current-carrying straight conductor is directly proportional to:
a) Resistance of conductor
b) Current through conductor
c) Voltage across conductor
d) Length of conductor
✅ Answer: b) Current through conductor
Explanation: Higher current produces a stronger magnetic field.
Q39. The magnetic field produced by a solenoid increases if we use:
a) Steel core
b) Soft iron core
c) Copper core
d) Aluminium core
✅ Answer: b) Soft iron core
Explanation: Soft iron gets magnetized easily and enhances the field.
Q40. The function of brushes in an electric motor is to:
a) Reverse current
b) Provide contact between coil and external circuit
c) Increase speed of motor
d) Reduce resistance
✅ Answer: b) Provide contact between coil and external circuit
Explanation: Brushes maintain sliding contact with commutator and external circuit.
Q41. The force on a moving charge in a magnetic field depends on:
a) Magnitude of charge
b) Velocity of charge
c) Magnetic field strength
d) All of these
✅ Answer: d) All of these
Explanation: F = qvB sinθ, so force depends on charge, velocity, and field.
Q42. If the current in a conductor is doubled, the magnetic field produced will:
a) Become half
b) Remain same
c) Double
d) Four times
✅ Answer: c) Double
Explanation: Magnetic field ∝ current, so doubling current doubles field.
Q43. The magnetic field at the center of a circular coil carrying current is proportional to:
a) Current × radius
b) Current ÷ radius
c) Current × resistance
d) Voltage ÷ radius
✅ Answer: b) Current ÷ radius
Explanation: B ∝ I/R, so stronger current or smaller radius increases field strength.
Q44. The function of an armature in an electric motor is to:
a) Produce current
b) Rotate due to magnetic force
c) Provide commutation
d) Act as permanent magnet
✅ Answer: b) Rotate due to magnetic force
Explanation: Armature (coil) rotates when current flows through it in a magnetic field.
Q45. Which rule is used to determine the direction of magnetic field around a straight conductor?
a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Right-hand thumb rule
d) Ampere’s circuital law
✅ Answer: c) Right-hand thumb rule
Explanation: Curling right-hand fingers around wire shows field direction.
Q46. The device which converts mechanical energy into electrical energy is:
a) Motor
b) Generator
c) Transformer
d) Battery
✅ Answer: b) Generator
Explanation: Generator works on electromagnetic induction to produce electricity.
Q47. In Fleming’s right-hand rule, the thumb represents:
a) Magnetic field
b) Current
c) Motion of conductor
d) Voltage
✅ Answer: c) Motion of conductor
Explanation: Right-hand rule: Thumb = Motion, First finger = Field, Middle = Induced current.
Q48. The core of an electromagnet is made of:
a) Steel
b) Soft iron
c) Copper
d) Aluminium
✅ Answer: b) Soft iron
Explanation: Soft iron loses magnetism quickly and is ideal for electromagnets.
Q49. A current-carrying conductor placed in a magnetic field experiences maximum force when angle between field and current is:
a) 0°
b) 45°
c) 90°
d) 180°
✅ Answer: c) 90°
Explanation: F = BIL sinθ. Maximum at θ = 90°.
Q50. Which rule is used to determine the direction of induced current in a generator?
a) Fleming’s left-hand rule
b) Fleming’s right-hand rule
c) Ampere’s rule
d) Maxwell’s rule
✅ Answer: b) Fleming’s right-hand rule
Explanation: Fleming’s right-hand rule is applied in generators to find induced current direction.
Magnetic Effects of Electric Current – MCQs (Part 3: Q51–Q75)
Q51. A current-carrying conductor produces a magnetic field because:
a) Protons move
b) Neutrons move
c) Electrons in motion create magnetic field
d) Stationary charges attract
✅ Answer: c) Electrons in motion create magnetic field
Explanation: Current is the movement of electrons, and moving charges generate a magnetic field.
Q52. Which of the following is NOT an application of electromagnets?
a) Electric bell
b) Electric motor
c) Transformer
d) Bar magnet
✅ Answer: d) Bar magnet
Explanation: A bar magnet is permanent, not an electromagnet.
Q53. The field lines outside a bar magnet emerge from:
a) South pole and enter north pole
b) North pole and enter south pole
c) Center of magnet
d) Randomly from sides
✅ Answer: b) North pole and enter south pole
Explanation: Magnetic field lines move north → south outside, and south → north inside the magnet.
Q54. Which of the following increases the strength of an electromagnet?
a) Decreasing current
b) Increasing number of turns
c) Using air core
d) Reducing voltage
✅ Answer: b) Increasing number of turns
Explanation: More turns per unit length strengthen the magnetic field.
Q55. The direction of the magnetic field at the center of a circular coil carrying current depends on:
a) Current strength only
b) Radius of coil
c) Direction of current in coil
d) Type of material
✅ Answer: c) Direction of current in coil
Explanation: If current is clockwise, field points in one direction; anticlockwise reverses it.
Q56. The phenomenon of electromagnetic induction is the production of:
a) Magnetic field by current
b) Current by changing magnetic field
c) Heat by resistance
d) Motion by current
✅ Answer: b) Current by changing magnetic field
Explanation: Electromagnetic induction = Induced current due to change in magnetic field.
Q57. A galvanometer can be converted into an ammeter by connecting:
a) High resistance in series
b) Low resistance in parallel
c) Low resistance in series
d) High resistance in parallel
✅ Answer: b) Low resistance in parallel
Explanation: A shunt (low resistance) in parallel allows measurement of large currents.
Q58. A galvanometer can be converted into a voltmeter by connecting:
a) High resistance in series
b) Low resistance in parallel
c) High resistance in parallel
d) Low resistance in series
✅ Answer: a) High resistance in series
Explanation: Adding high resistance in series limits current and allows voltage measurement.
Q59. In an electric motor, the split ring works as:
a) Commutator
b) Insulator
c) Inductor
d) Battery
✅ Answer: a) Commutator
Explanation: Split rings reverse current direction every half rotation in the motor.
Q60. When a current-carrying coil is placed in a uniform magnetic field, it rotates because:
a) Field exerts equal force on both sides
b) Forces on two sides are equal and opposite but not collinear
c) Current stops flowing
d) Field lines vanish
✅ Answer: b) Forces on two sides are equal and opposite but not collinear
Explanation: This creates a torque, making the coil rotate.
Q61. The device that produces alternating current is:
a) Electric motor
b) AC generator
c) DC generator
d) Battery
✅ Answer: b) AC generator
Explanation: AC generator induces alternating current by electromagnetic induction.
Q62. The device that produces direct current is:
a) DC motor
b) AC generator
c) DC generator
d) Transformer
✅ Answer: c) DC generator
Explanation: With split ring commutator, a generator produces direct current.
Q63. The frequency of AC supplied to households in India is:
a) 50 Hz
b) 60 Hz
c) 100 Hz
d) 25 Hz
✅ Answer: a) 50 Hz
Explanation: In India, AC supply is 50 cycles per second.
Q64. Which of the following devices works on electromagnetic induction?
a) Motor
b) Generator
c) Transformer
d) Both b and c
✅ Answer: d) Both b and c
Explanation: Generator and transformer operate on electromagnetic induction.
Q65. Which of the following is NOT true about magnetic field lines?
a) They are closed continuous loops
b) They can intersect each other
c) They indicate direction of force on north pole
d) They are crowded where field is strong
✅ Answer: b) They can intersect each other
Explanation: Field lines never intersect; that would imply two directions at one point.
Q66. A strong and uniform magnetic field is obtained inside a:
a) Straight conductor
b) Solenoid
c) Circular loop
d) Bar magnet
✅ Answer: b) Solenoid
Explanation: Solenoid produces a strong, uniform magnetic field like a bar magnet.
Q67. Which of the following factors does NOT affect electromagnetic induction?
a) Speed of motion
b) Strength of magnetic field
c) Length of conductor in field
d) Resistance of voltmeter
✅ Answer: d) Resistance of voltmeter
Explanation: Induction depends on flux change, not the voltmeter.
Q68. The SI unit of magnetic flux is:
a) Tesla
b) Weber
c) Newton
d) Ampere
✅ Answer: b) Weber
Explanation: Magnetic flux is measured in Weber (Wb).
Q69. The force on a charged particle moving parallel to magnetic field is:
a) Maximum
b) Zero
c) Constant
d) Infinite
✅ Answer: b) Zero
Explanation: F = qvB sinθ. If θ = 0°, sinθ = 0 → force = 0.
Q70. The Earth’s magnetic field protects us from:
a) UV radiation
b) Cosmic rays and solar wind
c) Radio waves
d) Infrared radiation
✅ Answer: b) Cosmic rays and solar wind
Explanation: Earth’s magnetic field deflects harmful charged particles.
Q71. The needle of a compass shows deflection near a current-carrying wire because:
a) Heat is produced
b) Magnetic field is produced
c) Current attracts iron
d) Electric field acts
✅ Answer: b) Magnetic field is produced
Explanation: Current in a wire produces magnetic field that deflects compass.
Q72. In Fleming’s right-hand rule, the middle finger represents:
a) Magnetic field
b) Induced current
c) Motion
d) Voltage
✅ Answer: b) Induced current
Explanation: Right-hand rule: Thumb = Motion, First finger = Field, Middle = Current.
Q73. The principle of working of an electric generator is:
a) Heating effect of current
b) Magnetic effect of current
c) Electromagnetic induction
d) Electrolysis
✅ Answer: c) Electromagnetic induction
Explanation: Generators work by inducing current when a coil rotates in magnetic field.
Q74. The commercial unit of electrical energy is:
a) Joule
b) Watt
c) Watt-hour
d) Kilowatt-hour
✅ Answer: d) Kilowatt-hour
Explanation: 1 kWh = 1000 W × 1 hour = 3.6 × 10⁶ J.
Q75. Which of the following can change the direction of induced current?
a) Increasing current
b) Changing direction of motion of conductor
c) Changing material of conductor
d) Increasing resistance
✅ Answer: b) Changing direction of motion of conductor
Explanation: Reversing motion or field reverses induced current direction.
Magnetic Effects of Electric Current – MCQs (Part 4: Q76–Q100)
Q76. The direction of force on a current-carrying conductor in a magnetic field can be found using:
a) Fleming’s right-hand rule
b) Fleming’s left-hand rule
c) Ampere’s rule
d) Right-hand thumb rule
✅ Answer: b) Fleming’s left-hand rule
Explanation: Left-hand rule relates current, magnetic field, and force.
Q77. The device that converts electrical energy into mechanical energy is:
a) Generator
b) Motor
c) Transformer
d) Battery
✅ Answer: b) Motor
Explanation: Motor works on force experienced by current-carrying conductor in magnetic field.
Q78. The device that converts mechanical energy into electrical energy is:
a) Motor
b) Generator
c) Battery
d) Inverter
✅ Answer: b) Generator
Explanation: Generator works on electromagnetic induction principle.
Q79. Which of the following devices does NOT work on electromagnetic induction?
a) Generator
b) Transformer
c) Induction coil
d) Electric heater
✅ Answer: d) Electric heater
Explanation: Heaters work on heating effect of current, not induction.
Q80. In an AC generator, the commutator is replaced by:
a) Slip rings
b) Split rings
c) Brushes
d) Insulators
✅ Answer: a) Slip rings
Explanation: Slip rings maintain continuous contact in AC generators.
Q81. Which of the following statements is true about AC and DC?
a) AC changes direction, DC flows in one direction
b) AC flows in one direction, DC changes direction
c) Both AC and DC change direction
d) Both AC and DC are constant
✅ Answer: a) AC changes direction, DC flows in one direction
Explanation: AC reverses periodically, while DC is unidirectional.
Q82. Which of the following is NOT an advantage of AC over DC?
a) Easy to transmit over long distances
b) Can be stepped up or down using transformers
c) Can be easily stored in batteries
d) Economical transmission
✅ Answer: c) Can be easily stored in batteries
Explanation: AC cannot be stored directly in batteries, only DC can.
Q83. A DC generator uses:
a) Split ring commutator
b) Slip rings
c) Transformer
d) Rectifier
✅ Answer: a) Split ring commutator
Explanation: Split rings reverse current and convert AC into DC.
Q84. The energy conversion in an electric motor is:
a) Electrical → Mechanical
b) Mechanical → Electrical
c) Electrical → Heat
d) Electrical → Chemical
✅ Answer: a) Electrical → Mechanical
Explanation: Motors convert electrical energy into mechanical energy.
Q85. The energy conversion in an electric generator is:
a) Electrical → Mechanical
b) Mechanical → Electrical
c) Electrical → Chemical
d) Heat → Mechanical
✅ Answer: b) Mechanical → Electrical
Explanation: Generators convert mechanical energy into electrical energy.
Q86. Which of the following is NOT a use of electromagnets?
a) Lifting heavy iron loads
b) MRI machines
c) Loudspeakers
d) Refrigerator cooling
✅ Answer: d) Refrigerator cooling
Explanation: Cooling in refrigerators does not use electromagnets.
Q87. The Earth’s magnetic field is believed to be due to:
a) Rotation of Earth
b) Molten iron in outer core
c) Atmosphere
d) Gravitational pull
✅ Answer: b) Molten iron in outer core
Explanation: Movement of molten iron generates Earth’s magnetic field.
Q88. The south pole of a magnet attracts:
a) South pole of another magnet
b) North pole of another magnet
c) Both poles equally
d) None
✅ Answer: b) North pole of another magnet
Explanation: Unlike poles attract; like poles repel.
Q89. The working principle of an electric bell is based on:
a) Magnetic effect of current
b) Heating effect of current
c) Chemical effect of current
d) Induction heating
✅ Answer: a) Magnetic effect of current
Explanation: Electric bell uses electromagnets to attract the hammer.
Q90. The field strength inside a solenoid does NOT depend on:
a) Number of turns
b) Current
c) Length of solenoid
d) Material of wire
✅ Answer: d) Material of wire
Explanation: Wire material does not affect magnetic field strength.
Q91. If a charged particle moves perpendicular to magnetic field, it will move in:
a) Straight line
b) Circular path
c) Parabolic path
d) Zig-zag path
✅ Answer: b) Circular path
Explanation: Magnetic force acts as centripetal force, causing circular motion.
Q92. The direction of induced current opposes the cause producing it. This is known as:
a) Ohm’s law
b) Lenz’s law
c) Ampere’s law
d) Faraday’s law
✅ Answer: b) Lenz’s law
Explanation: Lenz’s law explains opposition of induced current to flux change.
Q93. A transformer works on:
a) AC only
b) DC only
c) Both AC and DC
d) Batteries
✅ Answer: a) AC only
Explanation: Transformers require alternating current to induce voltage.
Q94. Which of the following is NOT a use of transformers?
a) Stepping up voltage
b) Stepping down voltage
c) Power transmission
d) Producing DC from AC
✅ Answer: d) Producing DC from AC
Explanation: Transformers cannot convert AC into DC.
Q95. The commercial unit of electrical energy is:
a) Watt
b) Kilowatt-hour
c) Joule
d) Ampere-hour
✅ Answer: b) Kilowatt-hour
Explanation: Electricity bills are calculated in kWh.
Q96. Which of the following reduces energy loss during transmission of electricity?
a) High current, low voltage
b) Low current, high voltage
c) Low current, low voltage
d) High current, high voltage
✅ Answer: b) Low current, high voltage
Explanation: Power loss (P = I²R) is minimized when current is low, voltage high.
Q97. The frequency of household AC supply in India is:
a) 25 Hz
b) 50 Hz
c) 60 Hz
d) 100 Hz
✅ Answer: b) 50 Hz
Explanation: In India, AC supply alternates 50 times per second.
Q98. Which of the following converts AC into DC?
a) Transformer
b) Rectifier
c) Generator
d) Motor
✅ Answer: b) Rectifier
Explanation: Rectifiers change alternating current into direct current.
Q99. Which of the following is NOT true about electric current and magnetism?
a) Current produces magnetic field
b) Magnetic field produces current
c) Static charges produce magnetic field
d) Moving charges produce magnetic field
✅ Answer: c) Static charges produce magnetic field
Explanation: Only moving charges (current) create magnetic field, not static charges.
Q100. Which scientist gave laws of electromagnetic induction?
a) Maxwell
b) Faraday
c) Ampere
d) Fleming
✅ Answer: b) Faraday
Explanation: Michael Faraday gave laws explaining how changing magnetic flux induces EMF.
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❓ FAQ Section :
Q1. Why are Magnetic Effects of Electric Current MCQs important for CBSE Class 10?
Ans: They cover key physics concepts like electromagnets, Fleming’s rules, and electromagnetic induction, which are frequently asked in board exams.
Q2. How many marks can this chapter carry in CBSE Class 10 Board Exams?
Ans: On average, “Magnetic Effects of Electric Current” carries 6–8 marks, often including MCQs and application-based questions.
Q3. What are the most important topics in Magnetic Effects of Electric Current Class 10?
Ans: Solenoids, electromagnets, Fleming’s left-hand and right-hand rules, electric motors, generators, and electromagnetic induction are crucial topics.
Q4. How can I prepare Magnetic Effects of Electric Current MCQs effectively?
Ans: Revise NCERT thoroughly, solve previous year CBSE papers, practice MCQs with explanations, and focus on diagrams for motors and generators.
Q5. Do CBSE exams ask direct theory or application-based questions from this chapter?
Ans: Both. Expect direct definition-based MCQs as well as application-based ones (e.g., direction of force, induced current, Fleming’s rules).
