30 Multiple Choice Questions (MCQs) on Electrical and Electronics

Q1. Which of the following is an example of a semiconductor?

Copper

Aluminum

Silver

Silicon

Q2. Which of the following is used to amplify a weak signal?

Resistor

Transistor

Diode

Capacitor

Q3. What is the function of a relay in an electrical circuit?

To protect against overcurrent

To store electric charge

To amplify current

To switch between two circuits

Q4. What is the unit of electrical resistance?

Watt

Ohm

Volt

Ampere

Q5. What is the symbol for a resistor in an electrical circuit?

D

C

A

R

Q6. What is the unit of electrical power?

Volt

Watt

Joule

Ampere

Q7. What is the symbol for an LED in an electronic circuit?

L

R

D

C

Q8. What is the function of a thermistor in an electronic circuit?

To store electric charge

To regulate voltage

To measure temperature

To amplify current

Q9. What is the function of a transistor in an electronic circuit?

To switch between two circuits

To amplify current

To regulate voltage

To store electric charge

Q10. Which of the following is an insulator?

Glass

Aluminum

Silver

Copper

Q11. What is the function of a diode in an electronic circuit?

To allow current to flow in one direction only

To store electric charge

To amplify current

To regulate voltage

Q12. What is the function of an inductor in an electronic circuit?

To store magnetic energy

To regulate voltage

To amplify current

To store electric charge

Q13. What is the symbol for a battery in an electrical circuit?

A

D

C

B

Q14. What is the unit of electric potential difference?

Volt

Ampere

Ohm

Joule

Q15. Which of the following is used to regulate voltage in an electronic circuit?

Transistor

Resistor

Capacitor

Diode

Q16. Which of the following is used to measure electrical resistance?

Ohmmeter

Ammeter

Wattmeter

Voltmeter

Q17. What is the unit of electric current?

Ohm

Volt

Watt

Ampere

Q18. Which of the following is used to convert digital signals to analog signals?

Demodulator

Amplifier

Modulator

Oscillator

Q19. What is the function of a capacitor in an electronic circuit?

To switch between two circuits

To amplify current

To regulate voltage

To store electric charge

Q20. What is the function of a zener diode in an electronic circuit?

To store electric charge

To regulate voltage

To amplify current

To allow current to flow in one direction only

Q21. What is the symbol for a capacitor in an electronic circuit?

A

C

R

D

Q22. Which of the following is used to convert AC to DC?

Transistor

Resistor

Capacitor

Diode

Q23. Which of the following is an example of a passive electronic component?

Diode

Transistor

Resistor

Capacitor

Q24. Which of the following is used to protect against electrical overloads?

Transistor

Capacitor

Fuse

Diode

Q25. What is the function of a transformer in an electrical circuit?

To decrease current

To decrease voltage

To increase voltage

To increase current

Q26. What is the unit of frequency?

Ampere

Volt

Hertz

Watt

Q27. What is the function of a fuse in an electrical circuit?

To increase current

To protect against overcurrent

To decrease current

To regulate voltage

Q28. Which device is used to measure electric current?

Ammeter

Ohmmeter

Voltmeter

Multimeter

Q29. What is the SI unit of electric charge?

Joule

Coulomb

Watt

Newton

Q30. Which of the following materials is used as a conductor in electrical wires?

Glass

Aluminum

Rubber

Wood

Your Score

- of - questions are answered correctly

For Support

Office Hours

We are on

Company

Customer Service

Help

Electrical and Electronics

Your Score

- of - questions are answered correctly

Login to view answer sheet

FORGOT PASSWORD

SIGN UP

Email Verification

For Support

Office Hours

We are on

Company

Customer Service

Help