Most candidates were able to:
- copy and complete the given table containing the characteristics of some given wood;
- name types of clear finishes;
- sketch the cross-section of a 5 ply plywood.
However, they were unable to:
- label the parts of the plywood;
- name the types of manufactured board.
The expected response to question 2 is as given below:
(a)
Timber |
Colour |
Grain |
(i) Obeche |
White to pale yellow |
Usually interlocked |
(ii) African Mahogany |
Yellowish to reddish brown |
interlocked |
(b) (i) Clear finishes:
- oil finishes
- wax polish
- varnishes (spirit and oil)
- lacquers (cellulose plastic).
(ii) Wood finishes dry by:
- evaporation of the solvents
- oxidation
- chemical reaction
- crystallization.
(c) Sketch of a 5 ply plywood
(d) Manufactured boards
- plywood
- laminboard
- chipboard/particle board
- fibre board (hardboard/softboard)
- block-board
- batten board. ___________________________________________________________________________________________________ |
