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Woodwork Paper 3, Nov/Dec 2013  
Questions: 1 2 3 4 Main
General Comments
Weakness/Remedies
Strenght

QUESTION 2

Question 2

  1. Copy and complete the table below:

 

  

Timber

Colour

Grain

                     (i)

Obeche

 

 

                     (ii)

Mahogany

 

 

 

            (b)       (i)         Name two types of clear finishes.
                        (ii)        Name two ways in which wood finishes dry.

(c)        (i)         Sketch the cross-section of a 5-ply plywood.
(ii)        Label two parts of the plywood sketched in 2(c) (i) above.

            (d)       Name four manufactured boards.

OBSERVATION

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.

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