Electromagnetism MCQs

1. What property of a material determines its ability to conduct electricity?
A. Density
B. Resistivity
C. Hardness
D. Elasticity

Answer: B

2. Which law describes the magnetic field produced by a current-carrying conductor?
A. Gauss’s Law
B. Faraday’s Law
C. Ampère’s Law
D. Ohm’s Law

Answer: C

3. Which of the following devices is used to measure current in a circuit?
A. Voltmeter
B. Ammeter
C. Galvanometer
D. Ohmmeter

Answer: B

4. The phenomenon of electromagnetic induction is associated with which scientist’s discoveries?
A. Michael Faraday
B. Albert Einstein
C. Nikola Tesla
D. Thomas Edison

Answer: A

5. According to Lenz’s Law, the direction of an induced current in a conductor is such that it:
A. Creates a magnetic field opposing the change in magnetic flux
B. Creates a magnetic field aiding the change in magnetic flux
C. Does not affect the magnetic flux
D. Creates a current in the opposite direction of the magnetic flux

Answer: A

6. Which of the following is an example of a non-contact force in electromagnetism?
A. Tension in a string
B. Friction between surfaces
C. Magnetic force between two magnets
D. Normal force between two surfaces

Answer: C

7. What does the term ‘electromagnetic spectrum’ refer to?
A. Range of all possible frequencies of electromagnetic radiation
B. Range of colors visible to the human eye
C. Range of frequencies used in telecommunications
D. Range of frequencies used in radar technology

Answer: A

8. Which electromagnetic wave has the shortest wavelength?
A. Radio waves
B. Microwaves
C. X-rays
D. Gamma rays

Answer: D

9. What is the SI unit of magnetic flux?
A. Weber
B. Tesla
C. Gauss
D. Henry

Answer: A

10. The process of converting mechanical energy into electrical energy using a magnetic field is the principle behind:
A. Electric motor
B. Transformer
C. Dynamo
D. Capacitor

Answer: C

11. The ability of a material to become magnetized temporarily when placed in an external magnetic field is known as:
A. Paramagnetism
B. Diamagnetism
C. Ferromagnetism
D. Electromagnetism

Answer: A

12. Which law states that the magnetic flux through a closed surface is zero?
A. Gauss’s Law for Magnetism
B. Faraday’s Law of Induction
C. Ampère’s Law
D. Kirchhoff’s Law

Answer: A

13. What is the SI unit of magnetic field strength?
A. Tesla
B. Weber
C. Coulomb
D. Henry

Answer: A

14. Which of the following materials is typically used as a core in an electromagnet?
A. Copper
B. Aluminum
C. Iron
D. Silver

Answer: C

15. What does an electric generator convert mechanical energy into?
A. Heat energy
B. Electrical energy
C. Magnetic energy
D. Potential energy

Answer: B

16. Which of the following laws describes the force between two electric charges?
A. Newton’s Law
B. Coulomb’s Law
C. Ohm’s Law
D. Kepler’s Law

Answer: B

17. What is the relationship between current (I), voltage (V), and resistance (R) in an electrical circuit according to Ohm’s Law?
A. I = V / R
B. V = I * R
C. R = V / I
D. I = R / V

Answer: B

18. Which type of electromagnetic wave is used for communication with satellites?
A. Microwaves
B. Infrared waves
C. X-rays
D. Radio waves

Answer: A

19. The electric field strength is measured in which of the following units?
A. Volts
B. Watts
C. Ohms
D. Newtons per Coulomb

Answer: D

20. Which of the following is NOT a component of an AC circuit?
A. Capacitor
B. Inductor
C. Battery
D. Diode

Answer: C

21. What is the main difference between AC (Alternating Current) and DC (Direct Current)?
A. Direction of flow of electrons
B. Magnitude of current
C. Voltage level
D. Frequency of current reversal

Answer: A

22. Which law states that the induced electromotive force (emf) in any closed circuit is equal to the rate of change of magnetic flux through the circuit?
A. Gauss’s Law
B. Ohm’s Law
C. Faraday’s Law
D. Lenz’s Law

Answer: C

23. Which of the following effects is NOT explained by classical electromagnetism?
A. Photoelectric effect
B. Faraday’s Law of Induction
C. Maxwell’s equations
D. Ampère’s Law

Answer: A

24. Which type of material has the highest permeability?
A. Diamagnetic material
B. Paramagnetic material
C. Ferromagnetic material
D. Non-magnetic material

Answer: C

25. What is the SI unit of capacitance?
A. Ohm
B. Farad
C. Weber
D. Tesla

Answer: B

26. Which device is used to store electric charge?
A. Resistor
B. Capacitor
C. Inductor
D. Transformer

Answer: B

27. Which of the following electromagnetic waves is used in medical imaging to visualize bones and tissues?
A. Ultraviolet rays
B. X-rays
C. Gamma rays
D. Infrared waves

Answer: B

28. What phenomenon explains why a compass needle points north when placed near a current-carrying wire?
A. Ampère’s Law
B. Faraday’s Law
C. Lenz’s Law
D. Right-hand rule

Answer: A

29. Which law states that the electric flux through a closed surface is proportional to the electric charge enclosed by the surface?
A. Gauss’s Law
B. Ohm’s Law
C. Coulomb’s Law
D. Ampère’s Law

Answer: A

30. What property of an electric circuit does a voltmeter measure?
A. Resistance
B. Voltage
C. Current
D. Power

Answer: B

31. In a transformer, which coil is connected to the AC power source?
A. Primary coil
B. Secondary coil
C. Tertiary coil
D. Both primary and secondary coils

Answer: A

32. Which type of electromagnetic wave is used in remote controls for TVs and other appliances?
A. Infrared waves
B. Radio waves
C. Microwaves
D. Ultraviolet rays

Answer: A

33. The potential difference between two points in an electric circuit is commonly known as:
A. Current
B. Resistance
C. Voltage
D. Power

Answer: C

34. Which of the following devices converts electrical energy into mechanical energy?
A. Transformer
B. Capacitor
C. Inductor
D. Electric motor

Answer: D

35. Which electromagnetic wave has a frequency just below visible light?
A. Infrared waves
B. Ultraviolet rays
C. X-rays
D. Gamma rays

Answer: A

36. What phenomenon allows a material to retain its magnetization after the external magnetic field is removed?
A. Paramagnetism
B. Diamagnetism
C. Ferromagnetism
D. Electromagnetism

Answer: C

37. Which law states that the total electric flux through a closed surface is equal to the net electric charge enclosed by the surface divided by the permittivity of free space?
A. Gauss’s Law
B. Ohm’s Law
C. Coulomb’s Law
D. Ampère’s Law

Answer: A

38. The rate of doing work or the rate at which energy is transferred is known as:
A. Voltage
B. Power
C. Current
D. Energy

Answer: B

39. Which electromagnetic wave is used for cooking food in a microwave oven?
A. Infrared waves
B. Microwaves
C. Radio waves
D. X-rays

Answer: B

40. Which of the following is a property of an ideal conductor?
A. High resistance
B. Low resistance
C. High capacitance
D. Low capacitance

Answer: B

41. What is the SI unit of magnetic flux density?
A. Weber
B. Tesla
C. Coulomb
D. Henry

Answer: B

42. Which electromagnetic wave is used in radar systems to detect the speed of moving objects?
A. X-rays
B. Radio waves
C. Infrared waves
D. Ultraviolet rays

Answer: B

43. The process of charging a neutral object by bringing it near a charged object without direct contact is an example of:
A. Induction
B. Conduction
C. Polarization
D. Electrification

Answer: A

44. Which law relates the magnetic field around a closed loop to the electric current passing through the loop?
A. Gauss’s Law
B. Ampère’s Law
C. Faraday’s Law
D. Lenz’s Law

Answer: B

45. Which electromagnetic wave is used in fiber optics for communication?
A. Radio waves
B. Infrared waves
C. X-rays
D. Ultraviolet rays

Answer: B

46. Which of the following is a characteristic of superconductors at low temperatures?
A. High resistance
B. Low resistance
C. High capacitance
D. Low capacitance

Answer: B

47. The property of a material to oppose the flow of electric current is known as:
A. Conductance
B. Resistance
C. Capacitance
D. Inductance

Answer: B

48. Which of the following electromagnetic waves has the longest wavelength?
A. Gamma rays
B. X-rays
C. Radio waves
D. Ultraviolet rays

Answer: C

49. Which electromagnetic wave is used in astronomy to observe stars and galaxies?
A. Infrared waves
B. Microwaves
C. X-rays
D. Gamma rays

Answer: A

50. What is the unit of inductance in an electrical circuit?
A. Ohm
B. Farad
C. Weber
D. Henry

Answer: D

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