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Which of the following statements about a silicon diode in reverse bias is correct? A) The depletion region expands. B) The built‑in potential decreases. C) The junction behaves like a resistor. D) The minority carrier concentration increases.

medium MCQ 3 marks Class 12 · Physics · Semiconductor Electronics Materials Devices and Simple Circuits
  1. The depletion region expands.
  2. The built‑in potential decreases.
  3. The junction behaves like a resistor.
  4. The minority carrier concentration increases.
Answer
The depletion region expands.

The correct answer is The depletion region expands. — 3. Therefore statement A is correct.

Step-by-step solution

  1. 1. In reverse bias, the external voltage adds to the built‑in potential.
  2. 2. The higher potential pushes majority carriers away from the junction, widening the depletion region.
  3. 3. Therefore statement A is correct.
Common mistake: Thinking the depletion region shrinks or that the potential increases

Concept tested: Reverse bias effect on diode

Published · How this solution was prepared and checked

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