Observation

Majority of candidates were able to define preservation of timber.

However, few of them were unable to list two grades of sandpaper.

The expected response to question 4 is given below:
(a)    Preservation of timber:
Preservation of timber is the process of prolonging the serviceable life of timber.

(b)    Grades of sandpaper:
-      smooth;
-      very medium;
-      medium;
-      coarse;
-      very coarse.