Q: An n-type and a p-type silicon can be obtained by doping pure silicon with
(a) Sodium & magnesium respectively
(b) Phosphorus & boron respectively
(c) boron & Phosphorus respectively
(d) Indium & Sodium respectively
Ans: (b)
Sol: n-type semiconductor can be obtained by doping with controlled amount of Pentavalent atoms (e.g. Phosphorus ) and p-type semiconductor can be obtained by doping with trivalent atoms (e.g. Boron)