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BECE Science 2010 Paper

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Question : 23

Total: 40

The diagram below represents a circuit symbol in an electronic device. Study it carefully and use it to answer the question below.

The part of the diagram labelled I has

more electrons than holes.
no holes.
more holes than electrons.
the same number of holes as electrons.

Solution:

Concept:

The symbol is that of a

p

-

n

junction diode, where the

p

-type region has holes as the majority carriers.

Explanation:

• Part I is the

p

-type (anode) side of the diode.

• In

p

-type material, holes are more than electrons.

• Hence, part I has more holes than electrons.

Answer:

C. more holes than electrons.

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