Technology Grade 9 November EC 2013 Memo (English)

Downloaded from hlayiso.com SENIOR PHASE GRADE 9 NOVEMBER 2013 TECHNOLOGY MEMORANDUM MARKS: 100 This memorandum consists of 9 pages.

Downloaded from hlayiso.com 2 TECHNOLOGY (NOVEMBER 2013 INSTRUCTIONS AND INFORMATION 1. A learner must answer ALL the questions from SECTIONS A, B, C, D and E. 2. Sketches must be clear, neat and done in pencil. ALLOCATION OF MARKS SECTION A MULTIPLE-CHOICE QUESTIONS QUESTION 1 [15] SECTION B STRUCTURES QUESTION 2 [20] SECTION C PROCESSING QUESTION 3 [15] SECTION D SYSTEMS AND CONTROL (Mechanical Systems) QUESTION 4 [25] SECTION E SYSTEMS AND CONTROL (Electrical Systems) QUESTION 5 (18) [25] QUESTION 6 (7)

Downloaded from hlayiso.com (NOVEMBER 2013) TECHNOLOGY 3 SECTION A: MULTIPLE-CHOICE QUESTIONS QUESTION 1 1.1 1.1.1 C√ (1) 1.1.2 B√ (1) 1.1.3 A√ (1) 1.1.4 D√ (1) 1.1.5 A√ (1) 1.1.6 C√ (1) 1.1.7 B√ (1) 1.1.8 B√ (1) 1.1.9 B√ (1) 1.1.10 B√ (1) 1.2 1.2.1 Drying √ (1) 1.2.2 dynamic √ (1) 1.2.3 Triangulation √ (1) 1.2.4 natural √ and synthetic (or man-made) √ (2) TOTAL SECTION A: 15 SECTION B: STRUCTURES QUESTION 2 2.1 2.1.1 To span a gap √ To shorten the distance to be travelled Providing access for vehicles Saving time and money (1) 2.1.2 Cables √ and wires √ (2) 2.1.3 Cables – tensile √ Pillars – compressive √ (2) 2.1.4 The natural environment is damaged through the construction of a bridge. √ (1) 2.2 2.2.1 E√ (1) 2.2.2 D√ (1) 2.2.3 F√ (1) 2.2.4 A√ (1) 2.2.5 B√ (1)

Downloaded from hlayiso.com 4 TECHNOLOGY (NOVEMBER 2013 2.3 2.3.1 (4) 2.3.2 STRUCTURAL COMPONENT STIFF OR FLEXIBLE A Strut Stiff √ (1) B Tie Flexible √ (1) C Spring Flexible √ (1) D Truss Stiff √ (1) E Tent brace Flexible √ (1) TOTAL SECTION B: 20

Downloaded from hlayiso.com (NOVEMBER 2013) TECHNOLOGY 5 SECTION C: PROCESSING QUESTION 3 3.1 3.1.1 The armies who fought a long way from home needed to be fed. √ (1) 3.1.2 Heating food in sealed glass bottles. √ Sealing the food in an airtight container. √ (2) 3.1.3 Heating food at high temperatures kills micro-organisms. √/ Sealing the food in glass bottles removed air from around the food which prevents micro-organisms from growing on the food. (1) 3.1.4 He developed a method of sealing food in tins rather than glass bottles. √ (1) 3.1.5 Tins were lighter, unbreakable and easier to seal. √ (1) 3.1.6 The iron was coated with a fine layer of tin to stop it from rusting. √ (1) 3.2 3.2.1 E√ (1) 3.2.2 D√ (1) 3.2.3 A√ (1) 3.2.4 B√ (1) 3.2.5 F√ (1) 3.3 3.3.1 Electrolysis – Chemical decomposition produced by passing an electric current through a conducting liquid. √ (1) 3.3.2 It keeps water and air away from the surface of the metal. √ Improves the appearance and lifespan of metal. Resistance to corrosion. (Any ONE of the above or any other acceptable answers.) (1) 3.3.3 The metal underneath will corrode. √ (1) TOTAL SECTION C: 15

Downloaded from hlayiso.com 6 TECHNOLOGY (NOVEMBER 2013 SECTION D: SYSTEMS AND CONTROL (MECHANICAL SYSTEMS) QUESTION 4 4.1 OBJECT TYPE OF MOVEMENT 4.1.1 An aeroplane Linear movement √ (1) 4.1.2 A person jumping on a Reciprocating movement √ trampoline (1) 4.1.3 A wheel Rotating movement √ (1) 4.1.4 A pendulum Oscillating movement √ (1) 4.2 4.2.1 Input Process Output Crank moved → Belt drives, → Needle moves up by person √ linkages and and down √ gears √ (3) 4.3 4.3.1 Hydraulic systems use hydraulic fluids such as oil or water confined in strong cylinders to create strong forces. A hydraulic system usually consists of a closed device with two pistons. Force applied to one piston results in the second piston moving. √ (1) 4.3.2 The scoop of a front-end loader √ and a car lift. √ (2) 4.3.3 Hydraulic systems need to have control mechanisms to allow us to direct the flow of fluid to our advantage. √ (1) 4.3.4 A car lift needs control mechanisms to keep the lift up, otherwise the lift would just keep falling down. √ (1) 4.4 4.4.1 A belt drive is a pulley system that is joined together by means of belts. √ (1) 4.4.2 Sewing machines √ Motor vehicles √ (2)

Downloaded from hlayiso.com (NOVEMBER 2013) TECHNOLOGY 7 4.5 4.5.1 The load will drop to the ground and the crank handle will spin round in the wrong direction. √ (1) 4.5.2 By fitting in the ratchet and pawl mechanism to the crank. To jam the handle by tying it √ (1) 4.6 4.6.1 It is a compound gear system √ (1) 4.6.2 Gear Ratio = x = x √ = 9 √ The gear ratio is 9 : 1 or 1 : √ (3) 4.6.3 Shaft D will turn 9 times slower than Shaft A. √ (1) 4.7 4.7.1 The winch has a ratchet and pawl to prevent the cable unwinding from the drum when the handle is released. √ (1) 4.7.2 Pawl √ (1) 4.6.3 Ratchet and pawl √ (1) TOTAL SECTION D: 25

Downloaded from hlayiso.com 8 TECHNOLOGY (NOVEMBER 2013 SECTION E: SYSTEMS AND CONTROL (ELECTRICAL SYSTEMS) QUESTION 5 5.1 5.1.1 Letter of component Name of component A Battery √ (1) B Switch √ (1) C Resistor √ (1) D Capacitor √ (1) E Transistor √ (1) 5.1.2 Letter of Name of Input, Process, Output component component A Battery Input √ (1) B Switch Input √ (1) C Resistor Process √ (1) D Capacitor Process √ (1) E Transistor Process √ (1) 5.1.3 The Light Emitting Diodes (LED’s) will flash. √ (1) 5.2 5.2.1 Light-Dependent Resistor (LDR) √ (1) 5.2.2 Its resistance increases. It has a high resistance when it is dark and a low resistance when the light shines. √ (1) 5.2.3 (2 marks for the drawing of the symbol) (2) 5.3 5.3.1 A transistor amplifies electronic current. It turns currents on and off. √ (1) 5.3.2 (2) [18]

Downloaded from hlayiso.com (NOVEMBER 2013) TECHNOLOGY 9 QUESTION 6 6.1 6.1.1 Blue in the 1st band = 6 √ Grey in the 2nd band = 8 √ Red in the 3rd = 00 √ = 6 800 Ω (one mark for 6, one mark for 8 and one mark for 000) (3) 6.1.2 Resistors ensure that there is a flow of current in an electronic circuit. They deliberately slow or stop the flow of current. √ (1) 6.2 6.2.1 1st band 5 = Green √ 2nd band 0 = Black √ 3rd band Nil = Black √ (3) [7] TOTAL SECTION E: 25 GRAND TOTAL: 100