50 Objective questions in electronics with answers.

Find the Answers at the end of the questions.

1. What does LED stand for?
a. Light Emitting Diode
b. Low Energy Device
c. Long Electric Display
d. Lithium Emission Detector

2. Which component regulates the flow of current in a circuit?
a. Resistor
b. Capacitor
c. Diode
d. Transistor

3. What is the unit of electric current?
a. Ampere
b. Volt
c. Ohm
d. Watt

4. What does PCB stand for?
a. Printed Computer Board
b. Printed Circuit Board
c. Processed Circuit Breaker
d. Power Control Block

5. What is the SI unit of resistance?
a. Ohm
b. Watt
c. Volt
d. Ampere

6. Which electronic component stores electrical charge?
a. Inductor
b. Capacitor
c. Transformer
d. Transistor

7. Which device converts AC to DC?
a. Capacitor
b. Diode
c. Resistor
d. Transformer

8. What is the function of a transistor in a circuit?
a. Amplification
b. Rectification
c. Energy storage
d. Signal conversion

9. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
a. Faraday's Law
b. Ohm's Law
c. Kirchhoff's Law
d. Boyle's Law

10 Which component is used to store data in computers?
a. Transistor
b. Diode
c. Capacitor
d. Resistor

11. What type of semiconductor material is used in solar panels?
a. Silicon
b. Germanium
c. Gallium arsenide
d. Selenium

12. Which component is used to amplify or switch electronic signals?
a. Diode
b. Capacitor
c. Transistor
d. Resistor

13. What is the primary function of a resistor in an electrical circuit?
a. Store electrical energy
b. Control current flow
c. Amplify signals
d. Store data

14. Which law describes the conservation of charge in an electrical circuit?
a. Kirchhoff's Law
b. Ohm's Law
c. Newton's Law
d. Boyle's Law

15. What is the basic unit of capacitance?
a. Ampere
b. Henry
c. Farad
d. Volt

16. Which device is used to measure electrical resistance?
a. Ammeter
b. Voltmeter
c. Ohmmeter
d. Wattmeter

17. What is the purpose of a diode in an electrical circuit?
a. To amplify signals
b. To store energy
c. To control current flow in one direction
d. To measure voltage

18. Which type of logic gate performs the Boolean OR operation?
a. AND gate
b. OR gate
c. NOT gate
d. XOR gate

19. What type of semiconductor material is used in light sensors and solar cells?
a. Silicon
b. Germanium
c. Gallium arsenide
d. Selenium

20. What does IC stand for in electronics?
a. Integrated Converter
b. Insulated Capacitor
c. Inductive Coil
d. Integrated Circuit

21. Which electronic component is used to store one bit of data in a computer's memory?
a. Transistor
b. Capacitor
c. Diode
d. Resistor

22. What is the primary function of an inductor in an electrical circuit?
a. Store electrical energy
b. Control current flow
c. Amplify signals
d. Store data

23. Which device is used to step up or step down voltages in electrical circuits?
a. Transistor
b. Capacitor
c. Transformer
d. Resistor

24. What is the purpose of an operational amplifier (op-amp) in electronics?
a. To amplify signals
b. To store energy
c. To control current flow in one direction
d. To measure voltage

25. What is the function of a rectifier in an electrical circuit?
a. To amplify signals
b. To store energy
c. To convert AC to DC
d. To measure voltage

26. Which logic gate performs the Boolean AND operation?
a. OR gate
b. AND gate
c. NOT gate
d. XOR gate

27. What is the unit of frequency?
a. Hertz
b. Watt
c. Ohm
d. Ampere

28. Which law states that the total current entering a junction is equal to the total current leaving the junction?
a. Kirchhoff's Law
b. Ohm's Law
c. Newton's Law
d. Boyle's Law

29. What is the SI unit of inductance?
a. Ohm
b. Watt
c. Henry
d. Ampere

30. What is the function of a capacitor in an electrical circuit?
a. To store energy
b. To amplify signals
c. To control current flow in one direction
d. To measure voltage

31. Which component is used to generate an output waveform that corresponds to the input waveform in an amplifier?
a. Transistor
b. Capacitor
c. Diode
d. Resistor

32. Which device is used to measure electric current?
a. Ammeter
b. Voltmeter
c. Ohmmeter
d. Wattmeter

33. What is the primary function of a transformer in an electrical circuit?
a. Store electrical energy
b. Control current flow
c. Amplify signals
d. Step up or down voltages

34. Which logic gate performs the Boolean NOT operation?
a. OR gate
b. AND gate
c. NOT gate
d. XOR gate

35. What is the unit of power?
a. Ampere
b. Henry
c. Watt
d. Volt

36. What type of semiconductor material is commonly used in transistors?
a. Silicon
b. Germanium
c. Gallium arsenide
d. Selenium

37. What is the primary function of a diode in an electrical circuit?
a. To amplify signals
b. To store energy
c. To control current flow in one direction
d. To measure voltage

38. Which device is used to measure voltage?
a. Ammeter
b. Voltmeter
c. Ohmmeter
d. Wattmeter

39. What is the function of an oscillator in electronics?
a. To amplify signals
b. To generate a periodic waveform
c. To control current flow in one direction
d. To measure voltage

40. Which logic gate performs the Boolean XOR operation?
a. OR gate
b. AND gate
c. NOT gate
d. XOR gate

41. What is the SI unit of capacitance?
a. Ohm
b. Farad
c. Henry
d. Volt

42. What is the function of a relay in electronics?
a. To amplify signals
b. To store energy
c. To control the flow of current in a circuit
d. To measure voltage

43. Which device is used to regulate voltage in an electrical circuit?
a. Transistor
b. Capacitor
c. Regulator
d. Resistor

44. What is the primary function of a potentiometer in electronics?
a. To amplify signals
b. To measure current
c. To vary resistance in a circuit
d. To measure voltage

45. Which logic gate performs the Boolean NAND operation?
a. OR gate
b. AND gate
c. NOT gate
d. NAND gate

46. What is the unit of magnetic flux?
a. Weber
b. Watt
c. Ohm
d. Ampere

47. What is the function of a zener diode?
a. To rectify AC to DC
b. To amplify signals
c. To regulate voltage
d. To store energy

48. Which device is used to measure resistance?
a. Ammeter
b. Voltmeter
c. Ohmmeter
d. Wattmeter

49. What is the primary function of a thyristor in electronics?
a. To amplify signals
b. To rectify AC to DC
c. To control large amounts of current
d. To measure voltage

50. Which logic gate performs the Boolean NOR operation?
a. OR gate
b. AND gate
c. NOT gate
d. NOR gate

These questions cover a variety of concepts within electronics, including components, laws, units, and functions, providing a diverse range of topics for assessment or learning purposes.

Answers

1. a. Light Emitting Diode
2. d. Transistor
3. a. Ampere
4. b. Printed Circuit Board
5. a. Ohm
6. b. Capacitor
7. b. Diode
8. a. Amplification
9. b. Ohm’s Law
10. b. Capacitor
11. a. Silicon
12. c. Transistor
13. b. Control current flow
14. a. Kirchhoff’s Law
15. c. Farad
16. c. Ohmmeter
17. c. To control current flow in one direction
18. b. OR gate
19. a. Silicon
20. d. Integrated Circuit
21. b. Capacitor
22. a. Store electrical energy
23. c. Transformer
24. a. To amplify signals
25. c. To convert AC to DC
26. b. AND gate
27. a. Hertz
28. a. Kirchhoff’s Law
29. c. Henry
30. a. To store energy
31. a. Transistor
32. a. Ammeter
33. d. Step up or down voltages
34. c. NOT gate
35. c. Watt
36. a. Silicon
37. c. To control current flow in one direction
38. b. Voltmeter
39. b. To generate a periodic waveform
40. d. XOR gate
41. b. Farad
42. c. To control the flow of current in a circuit
43. c. Regulator
44. c. To vary resistance in a circuit
45. d. NAND gate
46. a. Weber
47. c. To regulate voltage
48. c. Ohmmeter
49. c. To control large amounts of current
50. a. OR gate