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]]> Class 10 Science Chapter 12 Magnetic Effect of Electric Current 

1. Which scientist discovered the relationship between electricity and magnetism?
  • (A) Isaac Newton
  • (B) Hans Christian Oersted
  • (C) Michael Faraday
  • (D) James Clerk Maxwell
    • Answer

    Answer: (B) Hans Christian Oersted

     2. What happens when an electric current passes through a metallic wire?
  • (A) It produces heat only
  • (B) It produces a magnetic field
  • (C) It loses electrons
  • (D) It stops the flow of charge
    • Answer

    Answer: (B) It produces a magnetic field

     3. What was Oersted’s key observation in his experiment with a compass and current-carrying wire?
  • (A) The compass needle remained stationary
  • (B) The compass needle was deflected
  • (C) The wire started rotating
  • (D) The current stopped flowing
    • Answer

    Answer: (B) The compass needle was deflected

     4. What is the unit of magnetic field strength named after Oersted?
  • (A) Tesla
  • (B) Gauss
  • (C) Oersted
  • (D) Weber
    • Answer

    Answer: (C) Oersted

     5. What is the significance of Oersted’s discovery?
  • (A) It proved that electric current does not affect magnetism
  • (B) It established a relationship between electricity and magnetism
  • (C) It explained the concept of gravity
  • (D) It showed that electric current produces sound
    • Answer

    Answer: (B) It established a relationship between electricity and magnetism

     6. Why does a compass needle get deflected when brought near a bar magnet?
  • (A) Due to gravitational force
  • (B) Due to electrostatic force
  • (C) Due to the magnetic field of the bar magnet
  • (D) Due to air resistance
    • Answer

    Answer: (C) Due to the magnetic field of the bar magnet

     7. What do the iron filings around a bar magnet represent?
  • (A) Electric field lines
  • (B) Magnetic field lines
  • (C) Gravitational field lines
  • (D) Sound waves
    • Answer

    Answer: (B) Magnetic field lines

     8. What is a magnetic field?
  • (A) The area around a magnet where magnetic force can be detected
  • (B) The space where sound waves travel
  • (C) The region where gravity acts
  • (D) The area around an electric circuit
    • Answer

    Answer: (A) The area around a magnet where magnetic force can be detected

     9. Which of the following is true about magnetic field lines?
  • (A) They start from the south pole and end at the north pole
  • (B) They cross each other at some points
  • (C) They form closed loops from the north pole to the south pole
  • (D) They spread randomly in all directions
    • Answer

    Answer: (C) They form closed loops from the north pole to the south pole

     10. What happens when iron filings are sprinkled around a bar magnet?
  • (A) They move randomly
  • (B) They align themselves along magnetic field lines
  • (C) They stick together to form a single mass
  • (D) They repel each other
    • Answer

    Answer: (B) They align themselves along magnetic field lines

     11. What is the direction of magnetic field lines outside a bar magnet?
  • (A) From south pole to north pole
  • (B) From north pole to south pole
  • (C) In circular loops
  • (D) Parallel to the magnet
    • Answer

    Answer: (B) From north pole to south pole

     12. Why do two magnetic field lines never intersect each other?
  • (A) They have no physical existence
  • (B) They represent different magnetic forces
  • (C) If they intersect, the compass needle would point in two directions
  • (D) They cancel each other’s effect
    • Answer

    Answer: (C) If they intersect, the compass needle would point in two directions

     13. How can we visualize magnetic field lines around a magnet?
  • (A) Using an ammeter
  • (B) Using a voltmeter
  • (C) Using iron filings
  • (D) Using a thermometer
    • Answer

    Answer: (C) Using iron filings

     14. What happens to the density of magnetic field lines as the strength of the magnetic field increases?
  • (A) It decreases
  • (B) It remains constant
  • (C) It increases
  • (D) It disappears
    • Answer

    Answer: (C) It increases

     15. What is the shape of magnetic field lines around a straight current-carrying conductor?
  • (A) Straight lines
  • (B) Concentric circles
  • (C) Elliptical
  • (D) Random patterns
    • Answer

    Answer: (B) Concentric circles

     16. What determines the pattern of the magnetic field around a current-carrying conductor?
  • (A) The shape of the conductor
  • (B) The type of material
  • (C) The temperature of the conductor
  • (D) The color of the wire
    • Answer

    Answer: (A) The shape of the conductor

     17. In which direction does the compass needle deflect when current flows through a straight conductor placed above it?
  • (A) Parallel to the wire
  • (B) Towards the conductor
  • (C) Perpendicular to the conductor
  • (D) Opposite to the current direction
    • Answer

    Answer: (C) Perpendicular to the conductor

     18. What happens when the direction of current in a straight conductor is reversed?
  • (A) The direction of the magnetic field remains unchanged
  • (B) The magnetic field disappears
  • (C) The direction of the magnetic field is reversed
  • (D) The conductor starts moving
    • Answer

    Answer: (C) The direction of the magnetic field is reversed

     19. How does the strength of the magnetic field around a current-carrying conductor change with distance?
  • (A) It remains constant
  • (B) It decreases as distance increases
  • (C) It increases as distance increases
  • (D) It does not depend on distance
    • Answer

    Answer: (B) It decreases as distance increases

     20. Which of the following factors affects the strength of the magnetic field produced by a current-carrying conductor?
  • (A) The type of conductor
  • (B) The amount of current flowing
  • (C) The length of the conductor
  • (D) The shape of the battery
    • Answer

    Answer: (B) The amount of current flowing

     21. What happens to the magnetic field strength when the current in a conductor increases?
  • (A) It decreases
  • (B) It remains the same
  • (C) It increases
  • (D) It disappears
    • Answer

    Answer: (C) It increases

     22. How does the magnetic field behave as the distance from a current-carrying conductor increases?
  • (A) It remains constant
  • (B) It decreases
  • (C) It increases
  • (D) It reverses direction
    • Answer

    Answer: (B) It decreases

     23. What is the shape of the magnetic field around a straight current-carrying conductor?
  • (A) Straight lines
  • (B) Elliptical
  • (C) Concentric circles
  • (D) Random patterns
    • Answer

    Answer: (C) Concentric circles

     24. What is the right-hand thumb rule used for?
  • (A) Finding the direction of electric current
  • (B) Determining the shape of magnetic field lines
  • (C) Finding the direction of the magnetic field around a current-carrying conductor
  • (D) Calculating resistance in a circuit
    • Answer

    Answer: (C) Finding the direction of the magnetic field around a current-carrying conductor

     25. According to the right-hand thumb rule, if the thumb points in the direction of current, how do the fingers curl?
  • (A) Randomly
  • (B) Straight
  • (C) In concentric circles around the conductor
  • (D) Perpendicular to the conductor
    • Answer

    Answer: (C) In concentric circles around the conductor

     26. What does the right-hand thumb rule help to determine?
  • (A) The direction of electric current
  • (B) The direction of magnetic field around a current-carrying conductor
  • (C) The magnitude of electric current
  • (D) The strength of the magnetic field
    • Answer

    Answer: (B) The direction of magnetic field around a current-carrying conductor

     27. If the current in a vertical conductor flows downward, what will be the direction of the magnetic field around it?
  • (A) Clockwise
  • (B) Counterclockwise
  • (C) Straight
  • (D) Random
    • Answer

    Answer: (A) Clockwise

     28. What happens to the magnetic field lines as we move farther from a current-carrying conductor?
  • (A) They become closer
  • (B) They remain unchanged
  • (C) They spread out
  • (D) They become stronger
    • Answer

    Answer: (C) They spread out

     29. How does reversing the direction of current affect the magnetic field around a conductor?
  • (A) It has no effect
  • (B) It doubles the magnetic field strength
  • (C) It reverses the direction of the magnetic field
  • (D) It eliminates the magnetic field
    • Answer

    Answer: (C) It reverses the direction of the magnetic field

     30. Which of the following statements about magnetic field lines is true?
  • (A) They intersect each other
  • (B) They form closed loops
  • (C) They start from the south pole and end at the north pole
  • (D) They are strongest at the center of a conductor
    • Answer

    Answer: (B) They form closed loops

     31. What happens to the magnetic field when the number of turns in a current-carrying coil is increased?
  • (A) It remains the same
  • (B) It decreases
  • (C) It increases
  • (D) It disappears
    • Answer

    Answer: (C) It increases

     32. Which of the following statements about magnetic field lines is correct?
  • (A) They start from the south pole and end at the north pole
  • (B) They intersect each other
  • (C) They always form closed loops
  • (D) They spread randomly in all directions
    • Answer

    Answer: (C) They always form closed loops

     33. How does the magnetic field inside a solenoid behave?
  • (A) It is zero
  • (B) It increases as we move towards the ends
  • (C) It decreases as we move towards the center
  • (D) It is uniform
    • Answer

    Answer: (D) It is uniform

     34. What happens to the magnetic field if the current through a straight conductor is increased?
  • (A) It remains constant
  • (B) It increases
  • (C) It decreases
  • (D) It reverses direction
    • Answer

    Answer: (B) It increases

     35. Which of the following best describes a solenoid?
  • (A) A coil of many circular turns of insulated copper wire
  • (B) A straight current-carrying wire
  • (C) A bar magnet
  • (D) A simple electric circuit
    • Answer

    Answer: (A) A coil of many circular turns of insulated copper wire

     36. What is the direction of the magnetic field inside a solenoid?
  • (A) From north to south
  • (B) From south to north
  • (C) Parallel to the wire
  • (D) Circular around the solenoid
    • Answer

    Answer: (A) From north to south

     37. Why is soft iron used as the core of an electromagnet?
  • (A) It increases resistance
  • (B) It retains magnetism permanently
  • (C) It enhances the magnetic field strength
  • (D) It blocks the electric current
    • Answer

    Answer: (C) It enhances the magnetic field strength

     38. Which factor affects the strength of the magnetic field inside a solenoid?
  • (A) The thickness of the wire
  • (B) The type of insulating material
  • (C) The number of turns and current flowing through it
  • (D) The shape of the solenoid
    • Answer

    Answer: (C) The number of turns and current flowing through it

     39. What happens if a soft iron core is placed inside a current-carrying solenoid?
  • (A) The magnetic field weakens
  • (B) The solenoid stops working
  • (C) The magnetic field strengthens
  • (D) The current decreases
    • Answer

    Answer: (C) The magnetic field strengthens

     40. Which statement about the magnetic field inside a solenoid is correct?
  • (A) It is strongest at the center
  • (B) It is weaker at the center
  • (C) It has no specific direction
  • (D) It is absent inside
    • Answer

    Answer: (A) It is strongest at the center

     41. What is an electromagnet?
  • (A) A permanent magnet
  • (B) A magnet made by passing current through a coil
  • (C) A naturally occurring magnet
  • (D) A bar magnet
    • Answer

    Answer: (B) A magnet made by passing current through a coil

     42. What happens to an electromagnet when the current is switched off?
  • (A) It becomes stronger
  • (B) It loses its magnetism
  • (C) It starts rotating
  • (D) It heats up
    • Answer

    Answer: (B) It loses its magnetism

     43. Which of the following is NOT a use of an electromagnet?
  • (A) Electric bell
  • (B) Lifting heavy loads in scrapyards
  • (C) MRI machines
  • (D) Generating hydroelectric power
    • Answer

    Answer: (D) Generating hydroelectric power

     44. Which material is commonly used as the core of an electromagnet?
  • (A) Copper
  • (B) Aluminium
  • (C) Soft iron
  • (D) Plastic
    • Answer

    Answer: (C) Soft iron

     45. How can the strength of an electromagnet be increased?
  • (A) By reducing the number of turns in the coil
  • (B) By decreasing the current
  • (C) By increasing the number of turns and current
  • (D) By using a plastic core
    • Answer

    Answer: (C) By increasing the number of turns and current

     46. What happens when a current-carrying conductor is placed in a magnetic field?
  • (A) It starts rotating
  • (B) It experiences a force
  • (C) It loses its charge
  • (D) It stops conducting electricity
    • Answer

    Answer: (B) It experiences a force

     47. Which scientist suggested that a magnet must exert an equal and opposite force on a current-carrying conductor?
  • (A) Isaac Newton
  • (B) Hans Christian Oersted
  • (C) Andre-Marie Ampere
  • (D) Michael Faraday
    • Answer

    Answer: (C) Andre-Marie Ampere

     48. Which rule is used to determine the direction of force on a current-carrying conductor in a magnetic field?
  • (A) Right-hand thumb rule
  • (B) Fleming’s left-hand rule
  • (C) Ohm’s law
  • (D) Kirchhoff’s law
    • Answer

    Answer: (B) Fleming’s left-hand rule

     49. What happens when the direction of current in a conductor is reversed while placed in a magnetic field?
  • (A) The direction of force remains the same
  • (B) The conductor disappears
  • (C) The direction of force is reversed
  • (D) The conductor stops conducting
    • Answer

    Answer: (C) The direction of force is reversed

     50. In which direction does the force act on a conductor placed in a magnetic field?
  • (A) Parallel to the field
  • (B) Opposite to the current
  • (C) Perpendicular to both the field and current
  • (D) Randomly in any direction
    • Answer

    Answer: (C) Perpendicular to both the field and current

     51. Which rule helps determine the direction of motion of a conductor in a magnetic field?
  • (A) Ohm’s Law
  • (B) Fleming’s Left-Hand Rule
  • (C) Right-Hand Thumb Rule
  • (D) Faraday’s Law
    • Answer

    Answer: (B) Fleming’s Left-Hand Rule

     52. According to Fleming’s Left-Hand Rule, what does the thumb represent?
  • (A) Direction of current
  • (B) Direction of magnetic field
  • (C) Direction of force or motion
  • (D) Magnitude of current
    • Answer

    Answer: (C) Direction of force or motion

     53. Which of the following devices works on the principle of force on a current-carrying conductor in a magnetic field?
  • (A) Electric motor
  • (B) Transformer
  • (C) Battery
  • (D) Voltmeter
    • Answer

    Answer: (A) Electric motor

     54. What happens when the direction of the magnetic field is reversed in a current-carrying conductor?
  • (A) The conductor stops conducting
  • (B) The direction of the force on the conductor reverses
  • (C) The conductor heats up
  • (D) The current flow increases
    • Answer

    Answer: (B) The direction of the force on the conductor reverses

     55. In Fleming’s Left-Hand Rule, what does the forefinger represent?
  • (A) Direction of current
  • (B) Direction of magnetic field
  • (C) Direction of force
  • (D) Direction of resistance
    • Answer

    Answer: (B) Direction of magnetic field

     56. Which of the following devices works on the principle of Fleming’s Left-Hand Rule?
  • (A) Electric motor
  • (B) Transformer
  • (C) Battery
  • (D) Resistor
    • Answer

    Answer: (A) Electric motor

     57. What is the role of a split-ring commutator in an electric motor?
  • (A) To increase resistance
  • (B) To reverse the direction of current in the coil
  • (C) To decrease voltage
  • (D) To stop the motor
    • Answer

    Answer: (B) To reverse the direction of current in the coil

     58. Which of the following parts of an electric motor rotates?
  • (A) Stator
  • (B) Armature
  • (C) Brushes
  • (D) Battery
    • Answer

    Answer: (B) Armature

     59. Why does an electric motor continue to rotate in the same direction?
  • (A) Due to constant magnetic field
  • (B) Due to continuous current flow
  • (C) Due to the commutator reversing the current
  • (D) Due to friction
    • Answer

    Answer: (C) Due to the commutator reversing the current

     60. What happens if the current through an electric motor is stopped?
  • (A) It continues rotating
  • (B) It reverses direction
  • (C) It stops rotating
  • (D) It accelerates
    • Answer

    Answer: (C) It stops rotating

     61. What is the main function of an electric motor?
  • (A) To convert electrical energy into mechanical energy
  • (B) To convert mechanical energy into electrical energy
  • (C) To store electric charge
  • (D) To increase voltage
    • Answer

    Answer: (A) To convert electrical energy into mechanical energy

     62. Which part of an electric motor reverses the direction of current?
  • (A) Armature
  • (B) Battery
  • (C) Split-ring commutator
  • (D) Field magnet
    • Answer

    Answer: (C) Split-ring commutator

     63. Which force is responsible for the rotation of the coil in an electric motor?
  • (A) Electrostatic force
  • (B) Magnetic force
  • (C) Gravitational force
  • (D) Frictional force
    • Answer

    Answer: (B) Magnetic force

     64. What happens to the direction of rotation if the polarity of the battery in an electric motor is reversed?
  • (A) It remains the same
  • (B) It stops rotating
  • (C) It reverses direction
  • (D) It rotates faster
    • Answer

    Answer: (C) It reverses direction

     65. Which rule is used to determine the direction of force in an electric motor?
  • (A) Fleming’s Right-Hand Rule
  • (B) Fleming’s Left-Hand Rule
  • (C) Right-Hand Thumb Rule
  • (D) Ohm’s Law
    • Answer

    Answer: (B) Fleming’s Left-Hand Rule

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