CIVIL TECHNOLOGY(CIVIL SERVICES)
GRADE 12
NATIONAL SENIOR CERTIFICATE
MEMORANDUM
NOVEMBER 2019

QUESTION 1: OHSA, SAFETY, MATERIALS, TOOLS, EQUIPMENT AND JOINING (GENERIC)
1.1
1.1.1 B ✓(1)
1.1.2 I ✓ (1)
1.1.3 A ✓ (1)
1.1.4 G/H ✓ (1)
1.1.5 C ✓ (1)
1.1.6 F ✓ (1)
1.1.7 J ✓ (1)
1.1.8 E ✓ (1)
1.2 Electroplating:

• protects metals against corrosion. ✓
• improves the engineering- and mechanical properties of metal. ✓
• may be used to increase the thickness of undersized parts.
• is decorative.
• will extend the life span.
  ANY TWO OF THE ABOVE (2)

1.3 Curing ✓ (1)
1.4 The moisture:

• delays/prevents the rapid drying of fresh concrete.
• prevents concrete from cracking. ✓
• ensures that fresh concrete hardens properly.
• allows adhesive bonding.
• increases strength of fresh concrete.
  ANY ONE OF THE ABOVE (1)

1.5

• When material is transported in bulk, it must be secured firmly. ✓
• When material is transported to higher levels, make sure that workers maintain a safe distance from the material being moved overhead. ✓
• When heavy material is transported with a lift/hoist/machine, a qualified person must take charge of operations.
• Wear appropriate personal protective equipment(PPE).
• Material must be transported in a safe way.
• Transport should not be overloaded with material.
  ANY TWO OF THE ABOVE (2)

1.6 Scaffold planks should:

• be made of a solid wood at least 228 mm wide and 38 mm thick. ✓
• be able to support the load.
• be free from defects.
• not be painted as it will hide defects/be slippery.
• be supported at distances not exceeding 1,25 m.
• not project less than 70 mm and not more than 230 mm beyond the ends of the last prop.
• be firmly secured to prevent its displacement.
• be placed in such a way to prevent materials and tools from falling through.
  ANY ONE OF THE ABOVE (1)

1.7
1.7.1 Dumpy level ✓ (1)
1.7.2 If the dumpy level is not set up level:

• it will give inaccurate readings. ✓
• wrong levels will be transferred.
• true levels will not be transferred.
  ANY ONE OF THE ABOVE (1)

1.8
1.8.1 A – Plastic plug/Plug/Rawl plug/Fisher plug/Fibre plug ✓ (1)
1.8.2 A screw ✓ (1)
1.8.3 Plastic plugs are used to secure:

• cupboards against a wall. ✓
• mirrors against a wall.
• portraits and similar objects against a wall.
• objects, limited to certain weight, against walls.
  ANY ONE OF THE ABOVE (1)

[20]

QUESTION 2: GRAPHICS AS MEANS OF COMMUNICATION (GENERICS)
ANSWER SHEET 2

ANSWER SHEET 2

NO.	QUESTION	ANSWER	MARKS
1	Identify the elevation in FIGURE A.	West Elevation ✓	1
2	Identify the type of roof that is used on the building in FIGURE A.	Hipped roof ✓	1
3	Identify number 1.	Ridge Capping/Ridge plate/Ridge tile/Hip cap ✓	1
4	Identify number 4	Balcony/Floor slab of balcony/Cantilever/Concrete slab ✓	1
5	Identify number 5	External door/Entrance door/Door/Outside door ✓	1
6	Identify number 7	Gutter ✓	1
7	Identify number 8	Rainwater down pipe/RWDP/Down pipe ✓	1
8	Identify number 12	Wash trough/Wash tub ✓	1
9	Identify number 13	Built-in cupboard/BIC ✓	1
10	Identify number 15	Landing ✓	1
11	Identify the company that printed the building plan.	Dlamini printers ✓	1
12	Name a suitable material that can be used for the manufacturing of number 2.	Fibre cement/Galvanised sheeting/ Timber/Plastic/PVC/Polyvinylchloride✓	1
13	Name the drawing symbol in the column for the notes in FIGURE 2 that must be installed in the kitchen.	Electricity meter/Electrical meter/Watt meter/Prepaid meter✓	1
14	Name the drawing symbol in the column for the notes in FIGURE 2 that indicates the type of bricks for the building	Face brick ✓	1
15	Name a material that should NOT be used to manufacture the frame of number 9 for coastal areas.	Steel/Mild steel/Iron/Ferrous metals ✓	1
16	Name a material that can be used to manufacture the sanitary fitting indicated by number 11.	Stainless steel/Plastic/Ceramic/ Granite/Acrylic/Fibre Glass/Concrete✓	1
17	Who checked the building plan?	P Carter ✓	1
18	How many types of windows are used in FIGURE B?	2 ✓	1
19	What does the abbreviation NGL at number 6 stand for?	Natural ground level ✓	1
20	Give the reference code for this plan.	QP 2-2019✓	1
21	Which room will electrical symbol 16 serve?	Lounge ✓
22	Describe the purpose of number 3.	Prevent people from falling off/through. ✓✓	2
23	Explain what the curved lines between the electrical installations in FIGURE B indicate.	Electrical wiring/Wiring/Electrical cable/Wiring from light switch to light/Shows which switch operates which electrical fitting. ✓✓	2
24	Explain why the light switch is mounted on the outside of the bathroom.	To prevent steam/moisture entering the switch/To prevent electrical shock due to moisture/For safety purposes ✓	1
25	Identify in FIGURE 2 which elevation does NOT have windows.	North elevation ✓	1
26	Identify the thickness of the internal wall in FIGURE 2.	North elevation ✓	1
27	Differentiate between symbols 13 and 15 in terms of their purpose.	110mm	2
28	Justify why FIGURE B is a ground floor plan	13 – Built-in cupboard: to store items. ✓ 15 – Landing: to rest/safety feature/change of direction of stairs ✓	1
29	Predict what will happen if number 10 is NOT installed.	Ground floorplan: does not indicate the roofline ✓ does not indicate the balcony indicate an entrance door to the house indicate a step at the entrance door the position of the windows and door correlate with the positions of the window and door on the west elevation	1
30	Redraw the staircase in FIGURE B in the adjacent column and indicate the direction of the flight with arrows.		2
31	Calculate the total length of the wall on the eastern side of the building. Show ALL calculations.	220 ✓ + 2 600 ✓ + 110 ✓ + 3 400 ✓+ 220 ✓ = 6 550 mm or 6,55 m✓ IF INCORRECT METHOD IS USED TO CALCULATE THE ANSWER USE THE FOLLOWING SLIDING SCALE: 4 MARKS WILL BE AWARDED IF ALL FIVE VALUES ARE CORRECT 3 MARKS FOR FOUR VALUES CORRECT 2 MARKS FOR THREE VALUES CORRECT 1 MARK FOR 2 VALUES CORRECT	6
	TOTAL:		40

QUESTION 3: CONSTRUCTION ASSOCIATED WITH CIVIL SERVICES, OHSA, AND QUANTITIES (SPECIFIC)
3.1.1 Step irons/Ladder/Concrete/Cast iron lid (ANY ONE)✓(1)
3.1.2 Step irons/Ladder/Concrete/Cast iron lid (ANY ONE) ✓ (1)
3.2
3.2.1 Wedge ✓ (1)
3.2.2 300 mm ✓ (1)
3.3
3.3.1 4✓ (1)
3.3.2 3 ✓ (1)
3.3.3 L x b x h OR Area of base x height OR Side x side x side OR S³
= 2,7 ✓x 2,7 ✓ x 2,7 ✓
= 19,68 m³ ✓ (4)
= 19,68 m³ x 1 000 ℓ ✓
= 19 680 ℓ OR 19 683 ℓ ✓ (2)
3.4
3.4.1 D- Clip ✓ (1)
3.4.2 Rope grab ✓ (1)
3.4.3 Breathing apparatus ✓ (1)
3.4.4 Transparent pipe level ✓ (1)
3.4.5 Manhole ✓ (1)
3.5

1. – Spirit level ✓
2. – Long straight edge/Straight edge✓
3. – Steel peg/Peg ✓ (3)

3.6 


QUESTION 4: HOT- AND COLD-WATER SUPPLY, TOOLS, EQUIPMENT AND MATERIALS (SPECIFIC)
4.1
4.1.1 Solar geyser system/Solar panel with geyser ✓ (1)
4.1.2 Water will get cold. ✓ (1)
4.1.3 To ensure maximum operation/efficiency. ✓
So that dirt cannot accumulate on the glass panel.
ANY ONE OF THE ABOVE (1)
4.2 An airlock is a pocket of air ✓ that is trapped inside ✓ a pipe and it prevents constant water flow. ✓ (3)
4.3 Causes of water hammer are:

• Sudden drop in secondary supply pipes ✓
• Loose jumpers in taps ✓
• Pipes in walls are not properly caulked
• Pipes are not properly secured in roof spaces above the ceiling
• Draw-off pipe is bigger than the supply pipe
• Bad/Poor installation
  ANY TWO OF THE ABOVE (2)

4.4
4.4.1 Balancing device (hot water control) ✓ (1)
4.4.2 Shower (movable)/Movable shower✓ (1)
4.5

4.6
4.6.1 S-Trap✓ (1)
4.6.2 40/50 mm ✓ (1)
4.7
4.7.1

1. – T Junction (Plain) ✓
2. – 90º bend with inspection eye✓ (2)

4.7.2

1. – Where three soil pipes with the same diameter meets/Where the branch pipe connects to the main sewerage pipe.✓
2. – Above ground where soil pipes have to change direction at a 90º angle/Outside the external wall where the water closet is . installed.✓ (2)

4.8
4.8.1 Pipe-thread cutting machine ✓ (1)
4.8.2 Water pressure testing pump ✓ (1)
4.8.3 Drain-cleaning machine/Jetting machine ✓ (1)
4.9 Functions of the centrifugal pump:

• To pump water out of excavations or trenches. ✓
• To move liquids through pipes or pipelines.✓
• To move slurries or liquid containing suspended matter.
• To convert rotational motion/kinetic energy to hydrodynamic energy.
• To increase the pressure of water in pipes.
  ANY TWO OF THE ABOVE (2)

4.10 It is not recommended that copper pipes are joined to galvanised pipes because:

• Negative effects on the pipeline can be caused due to the chemical reactions between the metals and acidic water✓
• Pit marks are caused by the chemical reaction between the two metals.✓
• An electrochemical reaction can take place between two dissimilar metals causing corrosion/dezincification.
  ANY TWO OF THE ABOVE (2)

4.11
4.11.1 Pillar tap✓ (1)
4.11.2 A pillar tap can be used at:

• Sinks/Kitchen ✓
• Baths/Bathroom/En-suite✓
• Basins/Bathroom/En-suite
  ANY TWO OF THE ABOVE (2)

4.12
4.12.1 Water meter ✓ (1)
4.12.2 Full way valve/Stop cock ✓
To shut off the water supply✓ (2)
4.12.3 Bibcock/Bib tap/Garden tap ✓ (1)
4.12.4 No reaction will take place/No ✓(1)
4.12.5 Dezincification ✓(1)
4.13 Water saving devices:

• Sensor taps ✓
• Demand pillar taps ✓
• Metered taps
  ANY TWO OF THE ABOVE (2)

4.14 Pressure control valve reduces/control the incoming water pressure to a building. ✓(1)
Temperature and pressure safety valve will reduce/relieve pressure in a hot water system in case of excessive pressure building up in the geyser. ✓(1)
[40]

QUESTION 5: GRAPHICS AS MEANS OF COMMUNICATION, ROOF WORK AND STORM WATER (SPECIFIC)
5.1
5.1.1 

5.1.2 Fascia board/Rafter ✓ (1)
5.2
5.2.1 Surface channel ✓ (1)
5.2.2 Rainwater shoe/Concrete shoe✓ (1)
5.2.3 Road kerb/Kerb ✓ (1)
5.2.4 Flashing ✓ (1)
5.3 Municipality/Local Government/Local Authorities. ✓(1)

[30]

QUESTION 6: SEWERAGE, SANITARY FITTINGS AND JOINING (SPECIFIC)
6.1
6.1.1 D ✓ (1)
6.1.2 A✓ (1)
6.1.3 D ✓ (1)
6.1.4 B ✓ (1)
6.1.5 C ✓ (1)
6.2 

6.3

(4)
6.4
6.4.1 135°✓ (1)
6.4.2 The purpose of the inspection eye is to gain access to the sewer pipe to:

• inspect it.✓
• clear blockages/allow for cleaning.
  ANY ONE OF THE ABOVE (1)

6.5 Fittings in a drainage system should:

• be made of material that is suitable for the piping. ✓
• remain watertight under normal working conditions. ✓
• be able to withstand internal water pressure of 50 kPa and external pressure of 30 kPa without leaking.
  ANY TWO OF THE ABOVE (2)

6.6

• Ventilation pipes/Vent pipe ✓
• Vent valves ✓ (2)

6.7 Septic tanks:

• Must be cleaned when the sludge level rises above the outlet and starts flowing out. ✓
• Soil water is discharged into a French drain. ✓(2)

Vacuum tanks:

• Must be emptied when it reaches its maximum capacity. ✓
• Must be cleaned more regularly than a septic tank.
• Sewage is stored until it is pumped out by the local municipality. ✓
  ANY TWO OF THE ABOVE (2)

6.8

6.9

ABREVIATIONS ALSO ACCEPTED IN THE PLACE OF THE SYMBOL
A MAXIMUM OF 2 MARKS WILL BE AWARDED IF THE WRONG LINE TYPES ARE USED FOR THE BRANCH PIPES.

[40]
TOTAL: 200