MCQ on pn junction diode 2023
1. **What is the majority charge carrier in the P-type region of a PN junction diode?**
- A. Electrons
- B. Holes
- C. Protons
- D. Neutrons
- **Answer: B. Holes**
2. **In forward bias, the PN junction diode:**
- A. Conducts current easily
- B. Acts as an insulator
- C. Generates light
- D. None of the above
- **Answer: A. Conducts current easily**
3. **The depletion region in a PN junction diode:**
- A. Contains only electrons
- B. Contains only holes
- C. Is devoid of charge carriers
- D. Acts as a conductor
- **Answer: C. Is devoid of charge carriers**
4. **What happens to the width of the depletion region in a reverse-biased PN junction diode?**
- A. Increases
- B. Decreases
- C. Remains constant
- D. Fluctuates
- **Answer: A. Increases**
5. **The voltage drop across a conducting forward-biased PN junction diode is approximately:**
- A. 0.7 V
- B. 1.5 V
- C. 2.3 V
- D. 5 V
- **Answer: A. 0.7 V**
6. **Zener diodes are commonly used for:**
- A. Rectification
- B. Voltage regulation
- C. Signal amplification
- D. Capacitance measurement
- **Answer: B. Voltage regulation**
7. **In reverse bias, a PN junction diode:**
- A. Allows current flow easily
- B. Exhibits breakdown
- C. Acts as an insulator
- D. Emits light
- **Answer: C. Acts as an insulator**
8. **What is the symbol for a PN junction diode in a circuit diagram?**
- A. \[+\] and \[-\]
- B. \(\Omega\)
- C. \(\bullet\) and \(\circ\)
- D. \(\rightarrow\) and \(\leftarrow\)
- **Answer: C. \(\bullet\) and \(\circ\)**
9. **The current in a forward-biased diode is mainly due to the flow of:**
- A. Electrons
- B. Holes
- C. Protons
- D. Neutrons
- **Answer: B. Holes**
10. **The process of combining P-type and N-type semiconductors to form a PN junction is called:**
- A. Doping
- B. Diffusion
- C. Junctioning
- D. Fusion
- **Answer: C. Junctioning**
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