Choose the correct statement(s) from the following:
(A) With increasing reverse bias voltage, the barrier potential across the junction of p-n diode decreases.
(B) A p-type semiconductor can be obtained by doping Si or Ge with trivalent atoms.
(C) A rectifier rectifies dc voltages.
(D) Pure semiconductors are called extrinsic semiconductors.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (B) only
Analysis:
(A) Incorrect — In reverse bias, the barrier potential increases, not decreases.
(B) Correct — P-type semiconductors are formed by doping Si or Ge with trivalent atoms (e.g., B, Al).
(C) Incorrect — A rectifier converts AC to DC, it does not rectify DC.
(D) Incorrect — Pure semiconductors are intrinsic; extrinsic semiconductors are doped.
Correct statement: (B)