Technology Grade 9 November EC 2010 Memo

Province of the EASTERN CAPE EDUCATION SENIOR PHASE GRADE 9 NOVEMBER 2010 TECHNOLOGY MARKING GUIDELINE MARKS: 100 This memorandum consists of 10 pages.

2 TECHNOLOGY (NOVEMBER 2010) INSTRUCTIONS AND INFORMATION 1. Learners answer all the questions from SECTIONS A,B,C and D, and one question from SECTION E. 2. Sketches must be clear, neat and done in pencil. ALLOCATION OF MARKS SECTION A: MULTIPLE CHOICE QUESTIONS QUESTION 1 [10] STRUCTURES AND SYSTEMS AND CONTROL (Mechanical SECTION B: Systems) QUESTION 2 (15) QUESTION 3 (15) [30] SECTION C: PROCESSING QUESTION 4 (14) QUESTION 5 (6) [20] SECTION D: SYSTEMS AND CONTROL (Electrical Systems) QUESTION 6 (11) QUESTION 7 (9) [20] PROCESSING (QUESTION 8) (20) SECTION E: OR [20] ELECTRICAL SYSTEMS (QUESTION 9) (20)

(NOVEMBER 2010) TECHNOLOGY 3 SECTION A: MULTIPLE CHOICE QUESTIONS QUESTION 1 1.1 A √ 1.2 C √ 1.3 A √ 1.4 C √ 1.5 D √ 1.6 B √ 1.7 C √ 1.8 C √ 1.9 A √ 1.10 B √ (10 x 1) [10] TOTAL SECTION A: 10 SECTION B: STRUCTURES AND SYSTEMS AND CONTROL (Mechanical Systems) QUESTION 2 2.1 Property Definition This is the strength needed to pull a 1 tensile strength √ material apart by breaking the atoms. √ This is when one material is hard 2 hardness √ enough to cut another material √ Electricity can easily flow through this 3 conductivity √ material √ (6) 2.2 1 beam √ 2 column √ 3 strut √ 4 stay / guy √ 5 buttress √ (5) 2.3 2.3.1 40 000 N + 8 000 N = 48 000 N √ 2.3.2 8 000 N + ½ of 40 000 N = 28 000 N √ 2.3.3 FIGURE 1 or FIGURE 3 Because the tractor (the load) is only on one side of the bridge. √√ (4) [15]

4 TECHNOLOGY (NOVEMBER 2010) QUESTION 3 3.1 3.1.1 A pulley is a grooved solid wheel in which a rope, belt or chain can fit. √ 3.1.2 A drive pulley is the powered pulley and the driven pulley is the one that move as a result of drive pulley. / As the driver pulley rotates, the belt moves causing the driven pulley to rotate. (Any other acceptable answer). √ 3.1.3 By twisting the rope or belt. √ 3.1.4 1 mark for twisting of rope √ 2 marks for two pulleys √√ 1 mark for rotation direction of pulleys √ (7) 3.2 A ratchet √ B pawl √ (2) 3.3 3.3.1 80 teeth √ 3.3.2 70 ÷ 2 = 35 revolutions per minute √ 3.3.3 Anticlockwise √ 3.3.4 number of teeth on driven gear Mechanical Advantage = number of teeth on driver gear 80 teeth √ =2 40 teeth √ Mechanical Advantage = 2:1 √ (6) [15] TOTAL SECTION B: 30

(NOVEMBER 2010) TECHNOLOGY 5 SECTION C: PROCESSING QUESTION 4 4.1 4.1.1 Name ONE reason why food manufacturers add additives to food.  to make food look good;  to make food taste different;  to improve nutritional value;  to improve the quality of food;  to make food last longer; (Any ONE or other acceptable reason) √ (1) 4.1.2 What is the negative behavioural effect of additives?  Temper tantrums or  hyperactivity (Any One of the above) √ (1) 4.1.3 Name any ONE of the foods that contain harmful additives.  sweets;  cakes;  biscuits;  fish fingers;  tin foods; etc (Any ONE of the above) √ (1) 4.1.4 How could hyperactive behaviour be improved?  Remove artificial colouring and  preservatives such as sodium benzoate from diet. √√ (2) 4.2 4.2.1  Make it safer to eat  Make it easier to eat  Make it last longer or to preserve it  Improve the quality for eating  Make it easier to digest √  Make it easier to transport √  Provide it at a cheaper price, especially if it is processed √ when it is in season (Any THREE reasons) (3) 4.2.2  The loss of some nutrients, especially water-soluble vitamins  Higher prices (Any ONE disadvantage) √ (1)

6 TECHNOLOGY (NOVEMBER 2010) 4.3 4.3.1 B √ 4.3.2 E √ 4.3.3 A √ 4.3.4 C √ 4.3.5 D √ (5) [14] QUESTION 5 5.1 Exposure to moisture and oxygen OR Exposure to air and water √√ (2) 5.2 A electroplating √ B painting √ C varnishing √ D galvanising √ (4) [6] TOTAL SECTION C: 20

(NOVEMBER 2010) TECHNOLOGY 7 SECTION D: SYSTEMS AND CONTROL (Electrical Systems) QUESTION 6 6.1 Letter of Input / Component Name of Process / Function (A, B, C, component Output D, E or F) Power source / cells A Battery Input that produce an electrical current Used to turn a circuit on or off / controls the flow B Switch Input of electrical current in a circuit Controls the amount of current flowing in a C Resistor Process circuit / deliberately slows or stops the flow of electricity. Allows current to flow in Light- one direction only / used emitting D Output to form letters and diodes numbers, e.g. on (LED) display of calculators It stores and releases E Capasitor Process electrical energy on a continuous basis It produces a sound F Buzzer Output when current flows through it (½ mark (½ mark (1 mark each x 4) each x 4) each x 4) =4 =2 =2 (8) 6.2  It is a special type of resistor that detects light or dark and whose resistance changes as the light intensity falling on it changes. √  When it is light, the resistance of the LDR increases to a point where current does not flow. √  When it is dark, the resistance decreases the current that flows in the circuit and the light goes on √ (3) [11]

8 TECHNOLOGY (NOVEMBER 2010) QUESTION 7 7.1 7.1.1 Transistor √ (1) 7.1.2  Transistors operate as electronic switches (they allow or don’t allow current to flow) √  Transistors can operate as amplifiers (they enlarge – make bigger – the input signal that they received) √ (2) 7.1.3 collector (√) base (√) emitter (√) 3 marks for correct sketch / symbol (6) [9] TOTAL SECTION D: 20 SECTION E : CHOICE QUESTION Learners answer EITHER QUESTION 8 OR QUESTION 9. QUESTION 8: PROCESSING 8.1 PRESERVING TECHNIQUES Food Products Freezing Drying Canning Pickling Salting Beef x x x x Peaches x x Beans x x Tomatoes x x Fish x x x x x Learners choose any TWO preserving techniques for each food product (10) 8.2 8.2.1  It keeps water and air away from the surface of the metal.  Improves the appearance and lifespan of metal  Resistance to corrosion (Any TWO of the above or any other acceptable answers) √√

(NOVEMBER 2010) TECHNOLOGY 9

10 TECHNOLOGY (NOVEMBER 2010) 8.2.2 The metal underneath it will corrode (rust). √ 8.2.3  steel parts of cars or trucks  electrical connectors  steel bolts  steel or aluminium parts in light fittings  jewellery √ (Any THREE of the above or any other acceptable answers) √√ 8.2.4  chrome plating  silver plating  gold plating  copper plating √  nickel plating √ √  zinc plating √ (Any FOUR of the above or any other acceptable answers) (10) [20] QUESTION 9: ELECTRICAL SYSTEMS 9.1 9.1.1 Resistor 1 blue in the 1st band = 6 orange in the 2nd band = 3 rd red in the 3 band = 00 = 6300 Ω (One mark for 6; one mark for 3 and one mark for 00) √√√ Resistor 2 yellow in the 1st band = 4 red in the 2nd band = 2 rd red in the 3 band = 00 = 4200 Ω (One mark for 4; one mark for 2 and one mark for 00) √√√ (6) 9.1.2 Silver = ±10 % √ (1) 9.1.3 (a) 1st Band 3 = Orange √ 2nd Band 9 = White √ 3rd Band 0000 = Yellow √ (b) 1st Band 2 = Red √ 2nd Band 0 = Black √ 3rd Band (blank) = Black √ (6)

(NOVEMBER 2010) TECHNOLOGY 11 9.2 9.2.1 Thermistor √ (1) 9.2.2 (One mark for the rectangle and one mark line through the rectangle) √√ (2) 9.2.3  hot water geysers,  fire sensors,  electric blankets,  toasters,  kettles,  heaters,  irons, (Any FOUR of the above or other acceptable appliances) √√√√ (4) [20] TOTAL SECTION E: 20 GRAND TOTAL: 100