Electricity and magnetism basics - Question Bank

1. What is the basic principle behind magnetic resonance imaging (MRI)?
A) Heating effect of current
B) Electromagnetic induction
C) Nuclear Magnetic Resonance
D) Electrostatic attraction
2. Which scientist is credited with demonstrating the relationship between electricity and magnetism, leading to the theory of electromagnetism?
A) Isaac Newton
B) Michael Faraday
C) James Clerk Maxwell
D) Hans Christian Ørsted
3. What is the phenomenon where a changing electric field produces a magnetic field?
A) Electromagnetic Induction
B) Ampere's Circuital Law
C) Maxwell's Equations
D) Displacement Current
4. What is the SI unit for magnetic field strength (or magnetic flux density)?
A) Gauss
B) Weber
C) Tesla
D) Oersted
5. In an AC circuit, what is the frequency of alternating current in India?
A) 50 Hz
B) 60 Hz
C) 100 Hz
D) 120 Hz
6. What is the primary function of a transformer?
A) To convert AC to DC
B) To increase or decrease AC voltage
C) To produce electric current
D) To store electrical energy
7. What is a device that uses the heating effect of electric current to produce light?
A) Motor
B) Generator
C) Electric heater
D) Incandescent bulb
8. What is the relationship between SI and CGS units for charge? 1 Coulomb is approximately equal to:
A) 3 x 10^9 statcoulombs
B) 3 x 10^-9 statcoulombs
C) 1 statcoulomb
D) 10 statcoulombs
9. What is the unit of electric charge in the CGS system?
A) Coulomb
B) Statcoulomb
C) Ampere
D) Volt
10. What is the unit of electric current in the CGS system?
A) Ampere
B) Statampere
C) Milliampere
D) Ohm
11. The formula for magnetic force on a moving charge is F = qvBsin(theta). What does 'B' represent?
A) Charge
B) Velocity
C) Magnetic Field Strength
D) Angle
12. The formula for magnetic force on a moving charge is F = qvBsin(theta). What does 'q' represent?
A) Velocity
B) Magnetic Field Strength
C) Charge
D) Distance
13. What is the force experienced by a charge moving in a magnetic field?
A) Electric Force
B) Magnetic Force
C) Gravitational Force
D) Centripetal Force
14. What does Lenz's Law state about the direction of induced current?
A) It flows in the same direction as the original current.
B) It flows in the opposite direction to the change in magnetic flux that produced it.
C) It flows perpendicular to the magnetic field.
D) It flows in the direction of the strongest magnetic field.
15. Lenz's Law is a consequence of the conservation of:
A) Charge
B) Momentum
C) Energy
D) Mass
16. Which law states that the induced electromotive force (EMF) in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit?
A) Ampere's Law
B) Biot-Savart Law
C) Faraday's Law of Induction
D) Lenz's Law
17. What is the SI unit of magnetic flux?
A) Tesla
B) Weber
C) Gauss
D) Ampere
18. What is the SI unit of magnetic flux density?
A) Weber
B) Tesla
C) Henry
D) Farad
19. What is the effect of increasing the current in a solenoid on its magnetic field strength (assuming number of turns is constant)?
A) Decreases
B) Increases
C) Remains unchanged
D) Becomes negative
20. What is the effect of increasing the number of turns in a solenoid on its magnetic field strength (assuming current is constant)?
A) Decreases
B) Increases
C) Remains unchanged
D) Becomes zero
21. A temporary magnet made by passing an electric current through a coil of wire wrapped around an iron core is called an:
A) Permanent magnet
B) Electromagnet
C) Inductor
D) Solenoid
22. What is the phenomenon where an electric current in a wire creates a magnetic field around it?
A) Electromagnetic Induction
B) Electrostatic Induction
C) Magnetism
D) Electromagnetism
23. Which device uses the principle of electromagnetic induction to convert electrical energy into mechanical energy?
A) Generator
B) Transformer
C) Motor
D) Capacitor
24. Which device converts mechanical energy into electrical energy using electromagnetic induction?
A) Motor
B) Generator
C) Transformer
D) Resistor
25. The principle of electromagnetic induction is described by which law?
A) Ohm's Law
B) Joule's Law
C) Faraday's Law
D) Coulomb's Law
26. What happens when a conductor moves through a magnetic field, or a magnetic field changes around a conductor?
A) Electric current is induced
B) Resistance increases
C) Charge decreases
D) Voltage drops
27. Magnetic field lines always form:
A) Closed loops
B) Straight lines from North to South
C) Straight lines from South to North
D) Parallel lines
28. What are the two poles of a magnet called?
A) Positive and Negative
B) North and South
C) East and West
D) Alpha and Beta
29. What is the region around a magnet where its influence can be detected called?
A) Electric field
B) Gravitational field
C) Magnetic field
D) Nuclear field
30. Like charges repel each other, and unlike charges attract each other. This is a statement of:
A) Ohm's Law
B) Coulomb's Law
C) Joule's Law
D) Faraday's Law
31. What phenomenon is responsible for the attraction or repulsion between charged objects?
A) Gravity
B) Magnetism
C) Electrostatic force
D) Nuclear force
32. What is the unit of inductance?
A) Farad
B) Ohm
C) Henry
D) Watt
33. What is the unit of capacitance?
A) Henry
B) Farad
C) Ohm
D) Coulomb
34. Which of the following is a good insulator?
A) Copper
B) Silver
C) Glass
D) Gold
35. Which of the following is a good conductor of electricity?
A) Plastic
B) Wood
C) Aluminum
D) Rubber
36. What is a substance that does not allow electric current to flow through it easily called?
A) Conductor
B) Semiconductor
C) Insulator
D) Electrolyte
37. What is a substance that allows electric current to flow through it easily called?
A) Insulator
B) Conductor
C) Resistor
D) Semiconductor
38. What happens to the resistance of a metallic conductor when its temperature increases?
A) Decreases
B) Increases
C) Remains the same
D) Becomes zero
39. What is the property of a material that opposes the flow of electric current?
A) Conductivity
B) Insulation
C) Resistance
D) Capacitance
40. Which law describes the heat produced in a resistor due to current flow?
A) Ohm's Law
B) Joule's Law
C) Coulomb's Law
D) Ampere's Law
41. What is the SI unit of energy or work done?
A) Watt
B) Volt
C) Joule
D) Ohm
42. What is the SI unit of electric power?
A) Joule
B) Watt
C) Volt
D) Ampere
43. Which material typically has very low electrical resistance?
A) Rubber
B) Glass
C) Copper
D) Wood
44. What is the SI unit of electrical resistance?
A) Volt
B) Ampere
C) Ohm
D) Farad
45. What does resistance oppose in an electrical circuit?
A) Flow of charge
B) Potential difference
C) Power
D) Energy
46. What is the SI unit of electric potential difference (voltage)?
A) Ampere
B) Ohm
C) Watt
D) Volt
47. According to Ohm's Law, which of the following is true?
A) V = I/R
B) I = V/R
C) R = V/I
D) V = R/I
48. What is the SI unit of electric current?
A) Coulomb
B) Watt
C) Ampere
D) Joule
49. Which quantity is defined as the rate of flow of electric charge?
A) Electric Potential
B) Electric Current
C) Electric Resistance
D) Electric Power
50. What is the SI unit of electric charge?
A) Ampere
B) Volt
C) Coulomb
D) Ohm
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