Technology Grade 9 November EC 2011 Memo (English)

Downloaded from hlayiso.com Province of the EASTERN CAPE EDUCATION SENIOR PHASE GRADE 9 NOVEMBER 2011 TECHNOLOGY MAKING GUIDELINE MARKS: 100 This memorandum consists of 8 pages.

Downloaded from hlayiso.com 2 TECHNOLOGY (MEMO) (NOVEMBER 2011) INSTRUCTIONS AND INFORMATION 1. Learners 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 [10] SECTION B STRUCTURES QUESTION 2 [15] SECTION C PROCESSING QUESTION 3 [15] SECTION D SYSTEMS AND CONTROL (Mechanical Systems) QUESTION 4 [30] SECTION E SYSTEMS AND CONTROL (Electrical Systems) QUESTION 5 (5) QUESTION 6 (25) [30]

Downloaded from hlayiso.com (NOVEMBER 2011) TECHNOLOGY (MEMO) 3 SECTION A: MULTIPLE-CHOICE QUESTIONS QUESTION 1 1.1 B√ 1.2 A√ 1.3 C√ 1.4 A√ 1.5 D√ 1.6 B√ 1.7 B√ 1.8 B√ 1.9 B√ 1.10 C√ (10 x 1) [10] TOTAL SECTION A: 10 SECTION B: STRUCTURES QUESTION 2 2.1 2.1.1 Reasons for building a bridge:  Spanning a gap. √  Shortening the distance to be travelled. √  Providing access to remote areas. √  Being able to cross rivers, seas, etc. √  Providing access for vehicles. √  Saving time and money √ (Any 2) (2) 2.1.2 Positive effect is that distance between places is shortened and distance is straight. √ Negative effect is that the natural environment is damaged through the construction of a bridge. √ (2) 2.1.3  Wood √  Rope √  Stone √  Iron √  Concrete √  Cables etc. √ (Any 2) (2) 2.2 Picture Property A Tensile strength √ B Toughness √ C Conductivity √ D Malleability √ E Compressive strength √ (5)

Downloaded from hlayiso.com 4 TECHNOLOGY (MEMO) (NOVEMBER 2011) 2.3 A – Dynamic √ B – Static √ C – Dynamic √ D – Dynamic √ (4) TOTAL SECTION B: 15 SECTION C: PROCESSING QUESTION 3 3.1 COLUMN A COLUMN B 3.1.1 Irradiation D √ 3.1.2 Refrigeration C √ 3.1.3 UHT − Ultra Heat Treatment E √ 3.1.4 Drying B √ 3.1.5 Pickling A √ (5) 3.2 3.2.1  Oil √  Paint √  Varnish √  Lacquer √  Wax √  Polish √ (Any 4) (4) 3.3 The symbol means that the object that it is on can be recycled. √ It can be found on milk, water bottles, juice, cosmetics, shampoo etc. √ (Answers referring to plastic bottles or plastic bags are correct.) (2) 3.4 3.4.1 It is because of chemicals added to food such as colourants, artificial flavourings and artificial preservatives. √ (1) 3.4.2 By removing colourants, artificial flavourings and artificial preservatives in food. P √ (1) 3.4.3  Restlessness √  Rash on the skin  Difficulty to concentrate  Air passages swell which causes difficulty in breathing. (Any 1) (1) 3.4.4 By comparing food labels of different brands of the same foods. √ (1) TOTAL SECTION C: 15

Downloaded from hlayiso.com (NOVEMBER 2011) TECHNOLOGY (MEMO) 5 SECTION D: SYSTEMS AND CONTROL (Mechanical Systems) 4.1 Name of object Benefit to people Mechanical or electrical (a) Bicycle gear system Makes cycling easier √ Mechanical √ (b) A torch Allows us to see in the Electrical √ dark √ (c) A hand-driven gear Makes lifting loads Mechanical √ winch easier. √ (d) A radio Allows people to hear Electrical √ music, news, commentary etc. √ (e) A jackhammer Allows construction Mechanical √ workers to demolish hard surfaces √ (f) A hand-driven Lifts a car when a Mechanical √ hydraulic car jack person needs to change a tyre. √ (12) 4.2 4.2.1 Input Process Output The feet and legs The chain and The back wheel of the cyclist exert gears transfer of the bicycle a force on the the energy from turns and enables pedals of the the pedals to the bicycle to bicycle. √ the back wheel move forward. √ (2) 4.3 4.3.1 A gear is a wheel with teeth on its edge. √ (1) 4.3.2 By using a third gear called an idler gear. √ (1) 4.3.3 Driver gear label = √ Driven gear label = √ Idler gear label = √ Direction arrow = √ (4)

Downloaded from hlayiso.com 6 TECHNOLOGY (MEMO) (NOVEMBER 2011) 4.4 4.4.1 (B is larger than A and outputs less revolutions per minute and is slower. C is smaller, therefore revolutions per minute will increase and rotation will be faster.) Learners now find the revolutions per minute at C. 60 √ B √ = 6 √ 10 C 20 revolutions x 6 √ = 120 revolutions at C √ (5) 4.5 Pawl Ratchet 4.5.1 A = Ratchet √ B = Pawl √ (2) 4.5.2 The purpose of the one way valve is to allow the flow of liquid or gas in one direction only. √ (1) 4.5.3 (a) Cleats –  Are used to hold ropes of sails on yachts. √  On the mast of a boat, blinds etc. (1) (b) One way valve –  Tube in a bicycle tyre √  Hydraulic car jacks (1) TOTAL SECTION D: 30

Downloaded from hlayiso.com (NOVEMBER 2011) TECHNOLOGY (MEMO) 7 SECTION E: SYSTEMS AND CONTROL (Electrical Systems) QUESTION 5 5.1 5.1.1 A light-dependant resistor (LDR) is used. √ (1) 5.1.2 The resistance increases when it gets dark. √ (1) 5.1.3 The safety lamp turns on because when it gets dark, the signal to the transistor becomes high. √ The transistor turns on the flow of current which turns on the safety lamp. √ (2) 5.1.4 The transistor is used as the automatic switch to turn the safety lamp on. √ (1) [5] QUESTION 6 6.1 6.1.1 Resistor 1 green in the 1st band = 5 √ nd orange in the 2 band = 3 √ red in the 3rd band = 00 √ = 5 300 Ὠ (one mark for 5, one mark for 3 and one mark for 00) (3) 6.1.2 Resistor 2 Yellow in the 1st band = 4 √ Green in the 2nd band = 5 √ rd Orange in the 3 band = 000 √ = 45 000 Ὠ (one mark for 4, one mark for 5 and one mark for 000) (3) 6.1.3 Gold = +- 5% √ (1) 6.1.4 (a) 1st band 4 = Yellow √ 2nd band 7 = Violet √ 3rd band 0 = Brown √ (b) 1st band 1 = Brown √ 2nd band 5 = Green √ 3rd band 00 = Red √ (c) 1st band 8 = Grey √ nd 2 band 9 = White √ 3rd band 000 = Orange √ (9)

Downloaded from hlayiso.com 8 TECHNOLOGY (MEMO) (NOVEMBER 2011) 6.2 6.2.1 Motor B. √ Lower resistance means higher current, √ which means the motor is stronger (has higher torque). √ (3) 6.3 6.3.1 To store electrical charge in a controlled manner and release it when needed. √ 6.3.2  The size of the plates. √  The distance between the plates. √  The type of dielectric used. √ (3) 6.4  Intercoms √  Warning signals in control rooms. √  Warning devices in cars, doorbells and computer games. √ (Any 2 of the above and other acceptable answers.) (2) TOTAL SECTION E: 30 GRAND TOTAL: 100