Electronics MCQs

1. What does LED stand for?
A. Light Emitting Diode
B. Long Electric Device
C. Light Emitting Device
D. Linear Electric Diode
Answer: A

2. Which component is used to store electrical charge?
A. Resistor
B. Capacitor
C. Diode
D. Transistor
Answer: B

3. What is the SI unit of electric current?
A. Ohm
B. Ampere
C. Volt
D. Watt
Answer: B

4. Which material is commonly used in the construction of semiconductors?
A. Copper
B. Silver
C. Silicon
D. Aluminum
Answer: C

5. A diode allows current to flow in which direction?
A. Only forward direction
B. Only reverse direction
C. Both forward and reverse directions
D. None of the above
Answer: A

6. Which type of circuit consists of two separate loops with one loop containing the load and the other containing the source?
A. Series circuit
B. Parallel circuit
C. Combination circuit
D. Open circuit
Answer: B

7. What is the purpose of a fuse in an electrical circuit?
A. To increase resistance
B. To regulate current flow
C. To interrupt excessive current
D. To store electrical energy
Answer: C

8. What is the basic unit of capacitance?
A. Ohm
B. Farad
C. Henry
D. Volt
Answer: B

9. Which component is used to amplify or switch electronic signals and electrical power?
A. Resistor
B. Capacitor
C. Transistor
D. Inductor
Answer: C

10. Which device converts alternating current (AC) into direct current (DC)?
A. Capacitor
B. Transistor
C. Diode
D. Inductor
Answer: C

11. What does PCB stand for in electronics?
A. Printed Circuit Board
B. Plastic Coated Board
C. Power Control Block
D. Primary Circuit Board
Answer: A

12. Which type of motor is often used in cassette tape recorders and VCRs for fast forward and rewind functions?
A. DC motor
B. Stepper motor
C. Universal motor
D. Synchronous motor
Answer: A

13. What is the process by which an electrical signal is converted into sound in a speaker?
A. Amplification
B. Modulation
C. Transduction
D. Oscillation
Answer: C

14. Which semiconductor device is used to amplify or switch electronic signals and electrical power?
A. Resistor
B. Capacitor
C. Diode
D. Transistor
Answer: D

15. What is the function of a resistor in an electrical circuit?
A. To store electrical energy
B. To regulate current flow
C. To amplify signals
D. To convert AC to DC
Answer: B

16. Which component is used to store electrical energy in an electrical circuit?
A. Resistor
B. Capacitor
C. Inductor
D. Diode
Answer: B

17. Which component is used to control the flow of current in a circuit?
A. Capacitor
B. Resistor
C. Transistor
D. Inductor
Answer: C

18. In a series circuit, how does the current through each component compare?
A. It is the same through each component
B. It varies depending on the component
C. It increases with each component
D. It decreases with each component
Answer: A

19. What is the unit of electrical resistance?
A. Ohm
B. Ampere
C. Volt
D. Farad
Answer: A

20. Which type of material allows current to flow easily?
A. Insulator
B. Conductor
C. Semiconductor
D. Superconductor
Answer: B

21. What is the primary function of a transformer in an electrical circuit?
A. To convert AC to DC
B. To store electrical energy
C. To step up or step down voltage
D. To regulate current flow
Answer: C

22. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
A. Ohm’s law
B. Kirchhoff’s law
C. Faraday’s law
D. Gauss’s law
Answer: A

23. Which component is used to protect sensitive electronic components from voltage spikes?
A. Capacitor
B. Inductor
C. Resistor
D. Varistor
Answer: D

24. What is the function of an oscillator in electronics?
A. To convert digital signals to analog
B. To amplify audio signals
C. To generate repetitive waveforms
D. To store electrical energy
Answer: C

25. Which component is used to smooth out fluctuations in DC voltage?
A. Resistor
B. Capacitor
C. Inductor
D. Diode
Answer: B

26. Which type of display technology uses organic compounds to emit light when an electric current passes through them?
A. LCD
B. LED
C. OLED
D. Plasma
Answer: C

27. What is the purpose of a heat sink in electronic devices?
A. To reduce noise
B. To dissipate heat
C. To amplify signals
D. To regulate current flow
Answer: B

28. Which device is used to protect electronic circuits from overcurrents?
A. Fuse
B. Inductor
C. Capacitor
D. Transistor
Answer: A

29. What is the primary function of a voltage regulator in electronics?
A. To store electrical energy
B. To convert AC to DC
C. To maintain a constant voltage level
D. To amplify signals
Answer: C

30. Which electronic component is used to store data in digital circuits?
A. Transistor
B. Capacitor
C. Resistor
D. Memory chip
Answer: D

31. Which type of logic gate performs the Boolean AND operation?
A. AND gate
B. OR gate
C. NOT gate
D. NAND gate
Answer: A

32. Which type of material has a conductivity between that of a conductor and an insulator?
A. Insulator
B. Conductor
C. Semiconductor
D. Superconductor
Answer: C

33. What is the purpose of a rectifier in electronics?
A. To regulate current flow
B. To convert AC to DC
C. To store electrical energy
D. To amplify signals
Answer: B

34. Which law states that the total current entering a junction is equal to the total current leaving the junction?
A. Ohm’s law
B. Kirchhoff’s law
C. Faraday’s law
D. Gauss’s law
Answer: B

35. Which electronic component is used to generate a clock signal in digital circuits?
A. Capacitor
B. Inductor
C. Oscillator
D. Diode
Answer: C

36. What is the function of a relay in an electrical circuit?
A. To amplify signals
B. To store electrical energy
C. To switch high currents using low currents
D. To convert AC to DC
Answer: C

37. Which type of motor is commonly used in electric fans and blowers?
A. DC motor
B. Stepper motor
C. Universal motor
D. Synchronous motor
Answer: C

38. What is the purpose of an antenna in a radio receiver?
A. To convert radio waves into sound waves
B. To amplify radio signals
C. To store electrical energy
D. To capture radio waves and convert them into electrical signals
Answer: D

39. Which type of semiconductor material has excess electrons and is negatively charged?
A. P-type
B. N-type
C. Insulator
D. Conductor
Answer: B

40. Which electronic component is used to protect circuits from reverse voltage and transient spikes?
A. Capacitor
B. Diode
C. Resistor
D. Varistor
Answer: B

41. What is the purpose of a potentiometer in electronics?
A. To amplify signals
B. To store electrical energy
C. To control voltage levels
D. To convert AC to DC
Answer: C

42. Which type of display technology is known for its high contrast ratio and deep blacks?
A. LCD
B. LED
C. OLED
D. Plasma
Answer: C

43. What is the function of a stepper motor in robotics?
A. To provide high torque at low speeds
B. To rotate continuously
C. To operate at a constant speed
D. To convert AC to DC
Answer: A

44. Which law states that the induced electromotive force (EMF) in a closed circuit is equal to the rate of change of magnetic flux through the circuit?
A. Ohm’s law
B. Kirchhoff’s law
C. Faraday’s law
D. Gauss’s law
Answer: C

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