Question 3
- Define a semiconductor.
- 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:
-
Definition of a semiconductor
A material that has electrical conductivity between those of conductors/metals and insulators.
- Examples of semiconductors
- Silicon
- Germanium
- Selenium
- Gallium arsenide