BECE Science 2020 Paper

Concept:In semiconductors, charge carriers are either electrons or holes, and doping decides which type is the majority carrier.Explanation:A hole is the absence of an electron in an atom.In a $\mathrm{p}$-type semiconductor, holes are the majority carriers and electrons are the minority carriers.In an $\mathrm{n}$-type semiconductor, electrons are the majority carriers and holes are the minority carriers.Therefore, the major charge carriers in $\mathrm{p}$-type semiconductors are holes.Answer:C. holes