Question 3
(a) State two reasons why non-ferrous metals used for beaten metal work.
(b) State two suitable surface finishing processes each for the following:
- aluminum dishes;
- bicycle frames;
- sheet steel litter bins.
(c) (i) State one physical test used to identify cast iron.
(ii) State two uses of mild steel.
.
Observation
Most of the candidates who attempted this question could not provide the required
responses to parts (a) and (c) of the question.
The required responses to these parts are:
Explaining two reasons why ferrous metals are used for beaten metalwork
- Because they are ductile
- Because they are malleable
- Because they are workable
- Because they are soft
(i) Stating one physical test used to identify cast iron
(ii) Stating two uses of mild steel
- Motor vehicle parts
- Bolts and nuts
- Structural work
- Roof trusses
- Ornamental work
- Agricultural implements