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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
Consider an npn transitor with its base-emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?
  • A
    Electrons crossover from emitter to collector.
  • B
    Holes move from base to collector.
  • C
    Electrons move from emitter to base.
  • ✓
    A and C both.
✓

Answer

Correct option: D.
A and C both.
Solution:
Key concept: Transistor:
A junction transistor is formed by sandwiching a thin layer of P-type semiconductor between two N-type semiconductors or by sandwiching a thin layer of N-type semiconductor between two p-type semiconductors.

E - Emitter (emits majority charge carriers)
C - Collects majority charge carries
B - base (provide proper interaction between E and C)

In normal operation base-emitter is forward biased, i.e., the positive pole of emitter base battery is connected to base and its negative pole is connected to the emitter. And collector base junction is reverse biased, i.e., the positive pole of the collector base battery is connected to collector and negative pole to base. Thus, electron moves from emitter to base and crossover from emitter to collector.

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