RRB Group D - Electricity and magnetism basics Online Test (MCQ Quiz)

1. What is the SI unit of electric charge?

A) Ampere B) Volt C) Coulomb D) Ohm

2. Which quantity is defined as the rate of flow of electric charge?

A) Electric Potential B) Electric Current C) Electric Resistance D) Electric Power

3. What is the SI unit of electric current?

A) Coulomb B) Watt C) Ampere D) Joule

4. 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

5. What is the SI unit of electric potential difference (voltage)?

A) Ampere B) Ohm C) Watt D) Volt

6. What does resistance oppose in an electrical circuit?

A) Flow of charge B) Potential difference C) Power D) Energy

7. What is the SI unit of electrical resistance?

A) Volt B) Ampere C) Ohm D) Farad

8. Which material typically has very low electrical resistance?

A) Rubber B) Glass C) Copper D) Wood

9. What is the SI unit of electric power?

A) Joule B) Watt C) Volt D) Ampere

10. What is the SI unit of energy or work done?

A) Watt B) Volt C) Joule D) Ohm

11. 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

12. What is the property of a material that opposes the flow of electric current?

A) Conductivity B) Insulation C) Resistance D) Capacitance

13. What happens to the resistance of a metallic conductor when its temperature increases?

A) Decreases B) Increases C) Remains the same D) Becomes zero

14. What is a substance that allows electric current to flow through it easily called?

A) Insulator B) Conductor C) Resistor D) Semiconductor

15. What is a substance that does not allow electric current to flow through it easily called?

A) Conductor B) Semiconductor C) Insulator D) Electrolyte

16. Which of the following is a good conductor of electricity?

A) Plastic B) Wood C) Aluminum D) Rubber

17. Which of the following is a good insulator?

A) Copper B) Silver C) Glass D) Gold

18. What is the unit of capacitance?

A) Henry B) Farad C) Ohm D) Coulomb

19. What is the unit of inductance?

A) Farad B) Ohm C) Henry D) Watt

20. What phenomenon is responsible for the attraction or repulsion between charged objects?

A) Gravity B) Magnetism C) Electrostatic force D) Nuclear force

21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. Which device converts mechanical energy into electrical energy using electromagnetic induction?

A) Motor B) Generator C) Transformer D) Resistor

28. Which device uses the principle of electromagnetic induction to convert electrical energy into mechanical energy?

A) Generator B) Transformer C) Motor D) Capacitor

29. 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

30. 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

31. 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

32. 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

33. What is the SI unit of magnetic flux density?

A) Weber B) Tesla C) Henry D) Farad

34. What is the SI unit of magnetic flux?

A) Tesla B) Weber C) Gauss D) Ampere

35. 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

36. Lenz's Law is a consequence of the conservation of:

A) Charge B) Momentum C) Energy D) Mass

37. 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.

38. 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

39. 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

40. 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

41. What is the unit of electric current in the CGS system?

A) Ampere B) Statampere C) Milliampere D) Ohm

42. What is the unit of electric charge in the CGS system?

A) Coulomb B) Statcoulomb C) Ampere D) Volt

43. 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

44. 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

45. 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

46. 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

47. What is the SI unit for magnetic field strength (or magnetic flux density)?

A) Gauss B) Weber C) Tesla D) Oersted

48. 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

49. 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

50. 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

Electricity and magnetism basics - Online Test

Test Results