Semiconductor, Diode, and Transistor Test

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1. Which of the following is an intrinsic semiconductor?

A) Copper
B) Silicon
C) Germanium
D) Both B and C

2. The process of adding impurities to a pure semiconductor is called:

A) Mixing
B) Alloying
C) Doping
D) Smelting

3. N-type semiconductors are formed by doping with elements from group:

A) I
B) II
C) III
D) V

4. The majority charge carriers in a P-type semiconductor are:

A) Electrons
B) Holes
C) Protons
D) Neutrons

5. The application of a forward bias to a PN junction:

A) Increases the barrier potential
B) Reduces the barrier potential
C) Does not affect the barrier
D) Makes it an insulator

6. Reverse bias in a diode means:

A) P to positive, N to negative
B) P to negative, N to positive
C) Both to positive
D) Both to negative

7. The region around the PN junction where mobile charges are absent is:

A) Conducting region
B) Depletion region
C) Valence band
D) Forbidden gap

8. Which device can convert AC to DC?

A) Resistor
B) Diode
C) Inductor
D) Capacitor

9. The “knee” voltage of a silicon diode is approximately:

A) 5 V
B) 0.7 V
C) 1.5 V
D) 0.2 V

10. Which is not a type of diode?

A) Zener diode
B) Light Emitting Diode (LED)
C) Schottky diode
D) Tunnel triode

11. A Zener diode is mainly used for:

A) Rectification
B) Amplification
C) Voltage regulation
D) Oscillation

12. In an NPN transistor, current flows from:

A) Collector to emitter
B) Emitter to base
C) Base to collector
D) Collector to base

13. The middle layer in a transistor is called:

A) Emitter
B) Base
C) Collector
D) Substrate

14. In a transistor, the emitter is generally:

A) Heavily doped
B) Lightly doped
C) Medium doped
D) Not doped

15. Common emitter configuration provides:

A) Low voltage gain
B) High voltage gain
C) No gain
D) Infinite gain

16. A transistor can be used as:

A) Only an amplifier
B) Only a switch
C) An amplifier or a switch
D) Neither amplifier nor switch

17. The output of a NOT gate is:

A) Always high
B) Always low
C) Complement of input
D) Same as input

18. Which logic gate gives a true output only when both inputs are true?

A) OR
B) AND
C) NOT
D) NAND

19. Which is a unipolar device?

A) BJT
B) FET
C) Diode
D) Thyristor

20. The most commonly used semiconductor for electronic devices is:

A) Carbon
B) Silicon
C) Silver
D) Copper