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Woodwork Paper 3, Nov/Dec. 2008  
Questions: 1 2 3 4 Main
General Comments
Weakness/Remedies
Strength

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Question 2

  1. State three reasons for preserving timber
  2. (i)   State three reasons for using widening joints

(ii) Make a pictorial sketch of a loose tongue and groove joint.

  1. Name one timber suitable for each of the following purposes:
  2. plywood face veneer;
  3. kitchen chopping board;
  4. formwork;
  5. chemistry laboratory tabletop.

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Observation

Most candidates were able to state the reasons for preserving timber.  However, they failed to:

  • state the reasons for using widening joints;
  • sketch loose tongue and groove joints
  • name the timber suitable for making the given items for specific purposes.

The expected response to question 2 is as given below:

2(a)      Reasons for preserving timber

            -           to prevent insect attack
            -           to prevent fungi attack
            -           to protect the timber from other wood destroying agents
            -           for durability
            -           to prevent distortion in timber (e.g. cupping, warping)
            -           to prevent the timber from deterioration.

  (b)      (i)         Reasons for using widening joints
                        -           to obtain wider boards
                        -           to obtain stable boards
                        -           to enhance surface decoration

            (ii)        Sketch of loose tongue and groove joint

(c)        Suitable timber

  • Mahogany, teak, walnut(cedar), mansonia, afromosia
  • Iroko, teak, abura, kusia, danta  
  • Obeche, silk wood/cotton tree                                                               
  • Iroko,abura, teak.


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