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Woodwork Paper 3, Nov/Dec. 2007  
Questions: 1 2 3 4 Main
General Comments
Weakness/Remedies
Strength

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Question 4

(a)Sketch a cross-section of a log and indicate the following pats:
(i)bast;
(ii)sapwood;
(iii)heartwood;
(iv)Medullar rays.

(b)State the specific use of each of the following grades of abrasive:
(i)Coarse
(ii)Medium;
(iii)Fine

(c)8tate two uses of each of the following West African timbers:
(i)iroko
(ii)obeche

_____________________________________________________________________________________________________
Observation

Few candidates were able to state the specific use of each of the given:

-grades of abrasive;
-West African timbers.
However, many candidates were unable to sketch the cross-section of a log and label the given parts correctly.

(a) Cross-section of a log
NOTE Either full or half- section is acceptable .

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(b) Uses of Abrasives

(i)Coarse: First abrasive grade used for removing plane marks on timber surface.
(ii)Medium: Intermediate abrasive grade used to smoothen the rough surface left behind when coarse abrasives are used on timber surface.

(iii)Fine: This abrasive grade is used preparatory to application of final finishes on timber surface Or
This is the final abrasive used before application of final finishes on timber.

(c)Uses of West African Timbers
(i)Iroko:
-Workbench tops
-Laboratory fittings
-Boat building
-Shop fittings
-Agricultural implements
-Tool handles
-Railway sleepers.

(ii)Obeche:
-Core of plywood
-Cheap household furniture
-Formwork in building construction
-Temporary work/structures.
-Packaging cases/boxes.

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