Physics Paper 2 WASSCE (PC), 2019

Question 3

  1. Define a semiconductor.
  2. Give two examples of semiconductors.

Observation

This is a popular question among candidates. Majority of the candidates could not distinguish among a conductor, a semiconductor and an insulator in (a) although candidates gave examples in (b). Performance was average.

The expected answer is:

  1. Definition of a semiconductor

    A material that has electrical conductivity between those of conductors/metals and insulators.

  2. Examples of semiconductors
    • Silicon
    • Germanium
    • Selenium
    • Gallium arsenide