Electronic Devices and Circuits – Multiple Choice Questions (MCQs)

1. 1. Which of the following materials is a semiconductor?

   • A. Copper
   • B. Silicon
   • C. Aluminum
   • D. Gold

2. 2. The forbidden energy gap in a conductor is:

   • A. Large
   • B. Small
   • C. Zero
   • D. Infinite

3. 3. In a P-type semiconductor

   • A. the majority charge carriers are:
   • B. Electrons
   • C. Holes
   • D. Protons

4. 4. Doping a semiconductor material leads to an increase in its:

   • A. Resistance
   • B. Conductivity
   • C. Bandgap
   • D. Melting point

5. 5. A P-N junction diode is formed by joining:

   • A. Two P-type semiconductors
   • B. Two N-type semiconductors
   • C. A P-type and an N-type semiconductor
   • D. A metal and a semiconductor

6. 6. When a P-N junction diode is forward biased

   • A. the depletion region:
   • B. Increases in width
   • C. Decreases in width
   • D. Remains unchanged

7. 7. The typical forward voltage drop for a germanium diode is approximately:

   • A. 0.7 V
   • B. 0.3 V
   • C. 1.2 V
   • D. 0.1 V

8. 8. A Zener diode is designed to operate in the ________ region.

   • A. Forward bias
   • B. Reverse breakdown
   • C. Cut-off
   • D. Saturation

9. 9. Which of the following diodes is primarily used for voltage regulation?

   • A. Rectifier diode
   • B. LED
   • C. Zener diode
   • D. Schottky diode

10. 10. A full-wave bridge rectifier requires how many diodes?

    • A. 1
    • B. 2
    • C. 3
    • D. 4

11. 11. The efficiency of a half-wave rectifier is approximately:

    • A. 40.60%
    • B. 81.20%
    • C. 50%
    • D. 90%

12. 12. Which component is commonly used as a filter in a power supply circuit?

    • A. Resistor
    • B. Inductor
    • C. Capacitor
    • D. Diode