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MHT CET Medical202621 April 2026Morning ShiftPhysicsSemiconductorsActual

Which of the following statements is NOT true?

Options

  1. AThe resistance of the intrinsic semiconductors decrease with increase in temperature
  2. BDoping pure silicon with trivalent impurities give p - type semiconductor
  3. CThe majority carries in n -type semiconductors is holes
  4. Dp - n junction diode has a negligible resistance in forward bias

Correct answer

C. The majority carries in n -type semiconductors is holes

Step-by-step solution

The resistance of an intrinsic semiconductor decreases with an increase in temperature because more electron-hole pairs are generated, which increases conductivity. Doping pure silicon with trivalent impurities (such as Boron, Aluminum, Gallium) creates a deficiency of electrons, leading to the formation of holes. This results in a p -type semiconductor. In an n -type semiconductor, pentavalent impurities are added, which provide extra electrons. Therefore, the majority charge carriers in an n -type semiconductor a

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