NCERT Book Class 10th SCIENCE MCQ
Chapter 12 : Magnetic Effects of Electric Current
Important Multiple Choice Questions (MCQs) with Answer
1. Who discovered the magnetic effect of electric current?
a) Thomas Edison
b) Hans Christian Oersted
c) Michael Faraday
d) Alexander Graham Bell
Answer: b) Hans Christian Oersted
2. The direction of magnetic field lines is determined by which rule?
a) Fleming’s Left-Hand Rule
b) Right-Hand Thumb Rule
c) Ohm’s Law
d) Faraday’s Law
Answer: b) Right-Hand Thumb Rule
3. On which principle does an electric motor work?
a) Electromagnetic Induction
b) Heating Effect of Electric Current
c) Magnetic Effect of Electric Current
d) Chemical Effect of Electric Current
Answer: c) Magnetic Effect of Electric Current
4. In Fleming’s Left-Hand Rule, the thumb represents the direction of:
a) Magnetic Field
b) Electric Current
c) Force (Motion)
d) Induced Current
Answer: c) Force (Motion)
5. On which principle does an electric generator work?
a) Electromagnetic Induction
b) Heating Effect of Electric Current
c) Chemical Effect of Electric Current
d) Magnetic Effect
Answer: a) Electromagnetic Induction
6. Which metal is used to make fuse wire in household electric circuits?
a) Copper
b) Iron
c) Tin-Lead Alloy
d) Aluminum
Answer: c) Tin-Lead Alloy
7. What is the SI unit of electric current?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: c) Ampere
8. What is the nature of magnetic field lines?
a) Straight Lines
b) Circular
c) Closed Curves
d) Broken Lines
Answer: c) Closed Curves
9. What is the function of a commutator in an electric motor?
a) Reverse the direction of current
b) Generate a magnetic field
c) Control the electric current
d) Reduce friction
Answer: a) Reverse the direction of current
10. Which of the following devices does NOT work on the principle of electromagnetic induction?
a) Electric Generator
b) Transformer
c) Electric Motor
d) Electric Heater
Answer: d) Electric Heater
11. On which type of current does a transformer work?
a) DC
b) AC
c) Both
d) None
Answer: b) AC
12. Which metal core is used in an electromagnet?
a) Aluminum
b) Soft Iron
c) Copper
d) Steel
Answer: b) Soft Iron
13. The magnetic effect of electric current is used in:
a) Electric Heater
b) Electric Bulb
c) Electric Bell
d) Electric Iron
Answer: c) Electric Bell
14. Fleming’s Right-Hand Rule is related to:
a) Electric Motor
b) Electric Generator
c) Electromagnet
d) Electric Heater
Answer: b) Electric Generator
15. What is the difference between AC and DC?
a) AC changes direction, DC does not
b) DC changes direction, AC does not
c) Both change direction
d) Neither changes direction
Answer: a) AC changes direction, DC does not
16. What is the function of an electric fuse?
a) Increase electric current
b) Protect the circuit from excess current
c) Increase voltage
d) Reduce resistance
Answer: b) Protect the circuit from excess current
17. Which current is used in a transformer?
a) Alternating Current (AC)
b) Direct Current (DC)
c) Both
d) None
Answer: a) Alternating Current (AC)
18. How is energy converted in an electric motor?
a) Electrical → Mechanical
b) Mechanical → Electrical
c) Light → Electrical
d) Heat → Electrical
Answer: a) Electrical → Mechanical
19. What is the voltage of AC current supplied to households?
a) 110 V
b) 220 V
c) 440 V
d) 1000 V
Answer: b) 220 V
20. Which of the following is NOT a magnetic material?
a) Iron
b) Nickel
c) Cobalt
d) Aluminum
Answer: d) Aluminum
21. What is the unit of magnetic field intensity?
a) Tesla
b) Weber
c) Ampere
d) Volt
Answer: a) Tesla
22. Who discovered electromagnetic induction?
a) Oersted
b) Faraday
c) Edison
d) Newton
Answer: b) Faraday
23. How is energy converted in an electric generator?
a) Mechanical → Electrical
b) Electrical → Mechanical
c) Light → Electrical
d) Heat → Electrical
Answer: a) Mechanical → Electrical
24. Which type of current is used in an electric motor?
a) AC
b) DC
c) Both
d) None
Answer: c) Both
25. Which device uses an electromagnet?
a) Electric Heater
b) Electric Iron
c) Electric Bell
d) Electric Bulb
Answer: c) Electric Bell
26. From where to where do magnetic field lines travel?
a) North to South
b) South to North
c) East to West
d) West to East
Answer: a) North to South
27. What does the magnetic effect of electric current influence?
a) Only magnets
b) Only charged particles
c) Magnets and current-carrying conductors
d) Only insulators
Answer: c) Magnets and current-carrying conductors
28. What is an electromagnet?
a) Permanent magnet
b) A material magnetized by electric current
c) Natural magnet
d) Non-magnetic material
Answer: b) A material magnetized by electric current
29. Which energy is converted into mechanical energy in an electric motor?
a) Light Energy
b) Heat Energy
c) Electrical Energy
d) Chemical Energy
Answer: c) Electrical Energy
30. Which energy is converted into electrical energy in a generator?
a) Mechanical Energy
b) Heat Energy
c) Light Energy
d) Chemical Energy
Answer: a) Mechanical Energy
31. What is the process of generating electric current called?
a) Electrolysis
b) Electromagnetic Induction
c) Electric Transmission
d) Electric Flow
Answer: b) Electromagnetic Induction
32. What is the function of a commutator in an electric motor?
a) Reverse current direction
b) Change magnetic field
c) Increase voltage
d) Reduce resistance
Answer: a) Reverse current direction
33. What is required for electromagnetic induction?
a) Stationary magnet
b) Moving magnet or conductor
c) Only electric current
d) Only resistance
Answer: b) Moving magnet or conductor
34. Which of the following is a magnetic material?
a) Aluminum
b) Copper
c) Iron
d) Silver
Answer: c) Iron
35. The magnetic effect of electric current is used in:
a) Electric Bulb
b) Electric Iron
c) Electric Bell
d) Electric Heater
Answer: c) Electric Bell
36. Which metal is used to make an electromagnet?
a) Steel
b) Soft Iron
c) Copper
d) Aluminum
Answer: b) Soft Iron
37. Which rule applies to an electric motor?
a) Fleming’s Right-Hand Rule
b) Fleming’s Left-Hand Rule
c) Ohm’s Law
d) Faraday’s Law
Answer: b) Fleming’s Left-Hand Rule
38. Which rule applies to an electric generator?
a) Fleming’s Right-Hand Rule
b) Fleming’s Left-Hand Rule
c) Ohm’s Law
d) Faraday’s Law
Answer: a) Fleming’s Right-Hand Rule
39. Which scientist is associated with electromagnetic induction?
a) Oersted
b) Faraday
c) Edison
d) Newton
Answer: b) Faraday
40. How is the direction of the magnetic field due to current determined?
a) Fleming’s Left-Hand Rule
b) Right-Hand Thumb Rule
c) Ohm’s Law
d) Faraday’s Law
Answer: b) Right-Hand Thumb Rule
41. Energy conversion in an electric motor is:
a) Electrical → Mechanical
b) Mechanical → Electrical
c) Light → Electrical
d) Heat → Electrical
Answer: a) Electrical → Mechanical
42. Energy conversion in an electric generator is:
a) Mechanical → Electrical
b) Electrical → Mechanical
c) Light → Electrical
d) Heat → Electrical
Answer: a) Mechanical → Electrical
43. On which principle does an electric fuse work?
a) Heating Effect of Current
b) Magnetic Effect of Current
c) Chemical Effect of Current
d) Electromagnetic Induction
Answer: a) Heating Effect of Current
44. The magnetic effect of electric current is used in:
a) Electric Heater
b) Electric Bulb
c) Electric Bell
d) Electric Iron
Answer: c) Electric Bell
45. Which metal is used to make an electromagnet?
a) Steel
b) Soft Iron
c) Copper
d) Aluminum
Answer: b) Soft Iron
46. What is the function of a commutator in an electric motor?
a) Reverse current direction
b) Change magnetic field
c) Increase voltage
d) Reduce resistance
Answer: a) Reverse current direction
47. What is required for electromagnetic induction?
a) Stationary magnet
b) Moving magnet or conductor
c) Only electric current
d) Only resistance
Answer: b) Moving magnet or conductor
48. The magnetic effect of electric current is used in:
a) Electric Bulb
b) Electric Iron
c) Electric Bell
d) Electric Heater
Answer: c) Electric Bell
49. Which metal is used to make an electromagnet?
a) Steel
b) Soft Iron
c) Copper
d) Aluminum
Answer: b) Soft Iron
50. Which rule applies to an electric motor?
a) Fleming’s Right-Hand Rule
b) Fleming’s Left-Hand Rule
c) Ohm’s Law
d) Faraday’s Law
Answer: b) Fleming’s Left-Hand Rule