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MHT CET Medical202624 April 2026Morning ShiftPhysicsSemiconductorsActual

Which of the following statements is NOT TRUE ?

Options

  1. AThe majority carriers in n-type semiconductors are electrons.
  2. BThe resistance of an intrinsic semiconductor decreases with increase in temperature.
  3. CDoping pure silicon crystal with trivalent impurities gives p-type semiconductor.
  4. DThe majority carriers in n-type semiconductors are holes.

Correct answer

D. The majority carriers in n-type semiconductors are holes.

Step-by-step solution

In an n-type semiconductor, pentavalent impurities are added to the pure semiconductor. Each pentavalent atom donates one electron to the conduction band. Therefore, electrons are the majority charge carriers and holes are the minority charge carriers. The statement 'The majority carriers in n-type semiconductors are holes' is incorrect. The resistance of an intrinsic semiconductor decreases with an increase in temperature because more electron-hole pairs are generated, increasing conductivity. Doping pure silicon

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