Most candidates were able to:

1. state the function of a trap in a sanitary installation;
2. list the sanitary appliances.

However, they were unable to:

1. describe the method of testing a drain line for water tightness;
2. state the purposes of providing ceiling in a building.

           
The expected response to question 5 is as given below:

5(a)      Function of a trap in sanitary installation:

            To provide a water seal against the outflow of foul air

5(b)      Five sanitary appliances:
           
            (i)         Water closet
            (ii)        Wash hand basin
            (iii)       Sink
            (iv)       Shower trays
            (v)        Bidets
            (vi)       Urinals

5(c)

 5(c)     -     Block the lower end of the drain line by inserting a drain stopper or plug.

1. Fill the section to be tested with water up to the upper end of the drain line.
2. Plug the upper end with a drain stopper.
3. Connect one end of rubber tubing to the stopper and the other to a water vessel with a pressure gauge.
4. Allow an interval of about 45 to 60 minutes for observation.  A leakage is indicated by a drop in the level of water in the vessel.

5(d)      Three purposes for providing ceiling in a building

• It provides thermal insulation in the building.
• It serves as a barrier to sound transmission.
• It accommodates services.
• It enhances the beauty of the room.
• It conceals the roof members.
• It checks the movement of birds and insects into the building.