Carpentry And Joinery (Paper 2) WASSCE (SC), 2023

Question 7

 

(a)    Explain each of the following timber defects:

cup shake;

twist.

(b)   (i) Sketch a galvanized roofing nail.
       (ii) List two types of screw.
(c)   (i)  State three characteristics of Abura timber.
(ii)   (ii)  State two reasons for lipping a plywood table top.

 

Observation

 

  • The explanation of the different defects is to an extent encouraging.
  • (i)   The drawing of a galvanized roofing nail is very good.

(ii)  They were able to list the two types of screw expected.

  • (i)   In stating the characteristics of Abura timber, the students were given different types of responses narrowing it to characteristics of hard amd soft wood.

The expected response to question 7 (c) (i) is as given below:

  • Seasons very well
  • Take finishes well
  • Easily worked on
  • Takes adhesive very well
  • Has straight grain
  • Fairly resistant to acid
  • Good for making veneer
  • It lacks pronounced grain marking
  • It has a pleasant surface texture

    (ii) The students responded very well to this question lipping a plywood table
top.