20 MCQs on Diodes: How Many Can a You Get Right?

Q 1. What is the main function of a diode?

A) Amplify signals
B) Conduct current in one direction
C) Store charge
D) Filter signals

Answer: B) Conduct current in one direction

Q 2. What is the most common type of diode?

A) LED
B) Zener diode
C) Schottky diode
D) PN junction diode

Answer: D) PN junction diode

Q 3. What is the typical forward voltage drop of a silicon diode?

A) 0.1V
B) 0.3V
C) 0.7V
D) 1.2V

Answer: C) 0.7V

Q 4. What is the typical forward voltage drop of a germanium diode?

A) 0.1V
B) 0.3V
C) 0.7V
D) 1.2V

Answer: B) 0.3V

Q 5. Which type of diode is used for voltage regulation?

A) LED
B) Zener diode
C) Schottky diode
D) Tunnel diode

Answer: B) Zener diode

Q 6. What happens when a diode is reverse-biased?

A) It conducts current
B) It blocks current
C) It amplifies signals
D) It stores charge

Answer: B) It blocks current

Q 7. Which diode is commonly used in high-frequency applications?

A) LED
B) Zener diode
C) Schottky diode
D) Varactor diode

Answer: C) Schottky diode

Q 8. Which diode emits light when forward-biased?

A) Zener diode
B) Schottky diode
C) LED
D) Varactor diode

Answer: C) LED

Q 9. What is the primary use of a varactor diode?

A) Voltage regulation
B) Frequency tuning
C) Light emission
D) Power rectification

Answer: B) Frequency tuning

Q 10. What type of diode is used for fast switching?

A) LED
B) Zener diode
C) Schottky diode
D) Tunnel diode

Answer: C) Schottky diode

Q 11. Which diode is characterized by a very sharp breakdown voltage?

A) LED
B) Zener diode
C) Schottky diode
D) Tunnel diode

Answer: B) Zener diode

Q 12. What is the main application of a photodiode?

A) Light detection
B) Voltage regulation
C) High-frequency switching
D) Power rectification

Answer: A) Light detection

Q 13. Which diode can be used as a voltage-controlled capacitor?

A) LED
B) Zener diode
C) Varactor diode
D) Schottky diode

Answer: C) Varactor diode

Q 14. What is the primary function of a rectifier diode?

A) Emit light
B) Regulate voltage
C) Convert AC to DC
D) Store charge

Answer: C) Convert AC to DC

Q 15. Which of the following diodes has the lowest forward voltage drop?

A) Silicon diode
B) Germanium diode
C) Schottky diode
D) Zener diode

Answer: C) Schottky diode

Q 16. What characteristic of a diode defines its maximum reverse voltage?

A) Forward voltage drop
B) Breakdown voltage
C) Current rating
D) Capacitance

Answer: B) Breakdown voltage

Q 17. Which diode type is typically used in microwave frequency applications?

A) LED
B) Zener diode
C) Gunn diode
D) Schottky diode

Answer: C) Gunn diode

Q 18. What type of diode is used to protect circuits from high voltage transients?

A) LED
B) Zener diode
C) TVS diode
D) Tunnel diode

Answer: C) TVS diode

Q 19. What is the main use of an avalanche diode?

A) Light emission
B) Voltage regulation
C) Frequency tuning
D) High-voltage operation

Answer: D) High-voltage operation

Q 20. Which diode is known for its negative resistance region?

A) LED
B) Zener diode
C) Schottky diode
D) Tunnel diode

Answer: D) Tunnel diode

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