Most candidates attempted the question and candidates’ performance was good.
In part (b), some candidates did not follow the stages or steps of water purification in a large waterworks, while many candidates could not differentiate between treatment of water for domestic use and waterworks for public consumption.
The expected answers were as follows:
(b) Stages of water purification in a Waterworks
- sedimentation
- alum treatment/coagulation
- filtration
- chlorination
- storage
- distribution.
6 x 1 (6 marks)
