building construction Paper 2 WASSCE (SC), 2018

Question 4

 

(a)        State the difference between a communication pipe and a service in cold water
supply system.
(b)        Sketch a cross-section through a soak-away pit with gravel filling.  
(c)        sketch each of the following electrical symbols:

(i)bell;

(ii)two-way switch;

(iii)socket outlet.

(d)       List two finishes that are applied to the internal surfaces of a sandcrete blockwall.

Observation

 

Most candidates were able to:
-   sketch each of the following electrical symbols:

  1. bell;
  2. two-way switch;
  3. socket outlet.
    -     List two finishes that are applied to the internal surfaces of a sandcrete blockwall.
    However, few of them failed to:
  4. (i)State the difference between a communication pipe and a service in cold water

supply system.

    Sketch a cross-section through a soak-away pit with gravel filling.

     

                The expected response to question 4 is as given below:
    (a)        Difference between communication pipe and service pipe:
    Communication pipe is that part of service pipe vested in the water company while service pipe is a pipe which is directly subject to pressure from a main, sometimes called the rising main, inside the building.

     (d)  finishes that are applied to the internal surfaces of a sandcrete blockwall:

    1. paint;
    2. wall tiles;
    3. wood panels;
    4. plastering;
    5. mosaic tiles;
    6. facing bricks;
    7. p.v.c. wall panels;
    8. tyrolean.