Natural Sciences Grade 9 November GP 2015 QP (Eng)

Downloaded from hlayiso.com GAUTENG DEPARTMENT OF EDUCATION PROVINCIAL EXAMINATION NOVEMBER 2015 GRADE 9 NATURAL SCIENCES MEMORANDUM 10 pages 1

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 GAUTENG DEPARTMENT OF EDUCATION PROVINCIAL EXAMINATION NATURAL SCIENCES MEMORANDUM PRINCIPLES RELATED TO MARKING NATURAL SCIENCES 1. If more information than marks allocated is given Stop marking when maximum mark is reached and put a wavy line and ‘max’ in the right- hand margin ( ~ max). 2. If, for example, three reasons are required and five are given Mark the first three irrespective of whether all or some are correct/incorrect. 3. Incorrect numbering If the answer fits into the correct sequence of questions but the incorrect numbering is given, it is acceptable. 4. If language used changes the intended meaning Do not accept. 5. Spelling errors If recognizable, accept, provided it does not mean something else in Natural Sciences or if it is out of context. 6. No changes may be made to the approved marking memorandum. 2

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 SECTION A QUESTION 1 MULTIPLE-CHOICE QUESTIONS 1.1 C√ 1.2 B√ 1.3 D√ 1.4 D√ 1.5 B√ 1.6 C√ 1.7 B√ 1.8 B√ (8) QUESTION 2 TERMINOLOGY 2.1 Atmosphere√ 2.2 Fuse√ 2.3 Mining√ 2.4 Lightning √ 2.5 Nebula√ 2.6 Cell √ (6) QUESTION 3 MATCHING ITEMS 3.1 C√ 3.2 A√ 3.3 B√ 3.4 H√ 3.5 F√ 3.6 E√ (6) TOTAL SECTION A: 20 3

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 SECTION B ENERGY AND CHANGE QUESTION 4 FORCE 4.1 A. Electrostatic force √ B. Electromagnetic force or Magnetic force √ C. Tension √ D. Gravitational force √ (4) 4.2 Force can cause an object to: • Start moving / stop moving √ • Speed up / slow down√ • Change direction √ • Rotate √ • Change shape √ (Mark any two.) (2) (6) QUESTION 5 SERIES AND PARALLEL CIRCUITS 5.1 Circuit diagram Marks allocated for: • Three cells connected in series √ • A bulb √ • A volt meter in parallel √ (3) 5.2 It tells us about the potential difference across the light bulb. √ (1) 5.3 The voltage over a parallel connection remains the same, irrespective of the amount of resistors in parallel. √√ (2) 5.4 Decrease √ (1) 5.5 In a series connection, the bulbs / resistors share the voltage of the battery OR Each bulb / resistor will have its own voltage OR There will be a voltmeter reading over each bulb in series.√√ (Mark any one for 2 marks.) (2) 4

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 5.6 • Type of material √ • Thickness of the conductor √ • Length of the conductor √ • Temperature of the conductor √ (Mark any two) (2) (11) QUESTION 6 SAFETY WITH ELECTRICITY 6.1 They occupied privately owned land where the city could not provide the services in terms of National legislation / they felt neglected by the municipality √√ (2) 6.2 Illegal connections can cause: • Fire√ • Electrical shock (electrocuted)√ • Death (Mark any two) (2) 6.3 Because illegal connections are regarded as energy theft (stealing electricity is an offence). √√ (2) (6) 5

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 QUESTION 7 POWER STATIONS AND THE NATIONAL ELECTRICITY GRID 7.1 FLOW CHART • Uranium is placed in the nuclear reactors. • Nuclear fission takes place. • A large amount of energy is released. • The released energy is used to heat water and convert it into steam.√√ (2) The hot steam causes the blades of a turbine to move. The turbine is connected to a generator √, which converts the mechanical energy √of the turning turbine into electrical energy.√ (3) The electrical energy is connected to the national electricity supply grid 7.2 They can cause: • Burns √ • Cancer √ • Genetic mutations √ • Radiation sickness • Death (Mark any two.) (2) (7) 6

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 QUESTION 8 COST OF ELECTRICAL POWER 8.1 Power rating of different appliances Rubric for marking the graph CRITERIA MARK 1. Heading (include both variables) 2 marks 2. Correct labeling of both axes 2 marks 3. Correct scales 1 mark 4. Plotting bars 1 – 3 bars correct 1 mark 4 – 6 bars correct 2 marks TOTAL 7 MARKS 8.2 Appliances with higher power rating use more energy and it will cost more.√√ (2) 8.3 Cost = Power (kW) x Time (h) x Unit Price = 2 kW x 2 h x 90c√ = R3, 60 √√ (1 mark for correct answer, 1 mark for correct unit) (3) (12) TOTAL SECTION B: 42 7

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 SECTION C EARTH AND BEYOND QUESTION 9 THE EARTH AS A SYSTEM 9.1 Because the parts of the earth-system are not independent √, but interlinked. √ (2) 9.2 9.2.1 Biosphere√ (1) 9.2.2 Hydrosphere√ (1) 9.3 The system will no longer work√ (Accept any other relevant answer.) (1) 9.4 9.4.1 Difference in altitude: 2 400 m – 1 700 m√ = 700 m√ Difference in temperature: 700 m / 100 m/ºC√ = 7ºC√ Temperature at 2 400 m = 26ºC - 7ºC√ = 19ºC√ (6) 9.4.2 Lower √ (1) (12) QUESTION 10 MINING IN SOUTH AFRICA 10.1 An open cast mine is an open pit mine where a pit or hole is formed on the surface.√√ (2) 10.2 Element √ (1) 10.3 The earth’s crust √ (1) 8

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 10.4 • Air and water polluted with hazardous chemicals from mine dumps would cause diseases to people. √√ • A polluted environment would prevent cattle rearing.√√ • A polluted environment would prevent the growing of crops.√√ • The wildlife environment at Kruger National Park would be damaged. • Income generated through tourists would decrease. • Changing of environmental temperature / climate change • Disturbing the ecosystem (6) (Accept any other relevant reason. Mark any three.) 10.5 • It will create job opportunities for people in the area.√√ • It will improve the economic wealth of the country.√√ • It will develop the villages in the area. (4) (Accept any other relevant reason. Mark any two.) 10.6 Similarity Metal ore is heated with carbon √ in the form of charcoal or coke in the presence of oxygen. √ (2) Difference The bloomy used in ancient days is replaced with a blast furnace.√√ (2) (18) 9

Downloaded from hlayiso.com MEMORANDUM NATURAL SCIENCES GRADE 9 QUESTION 11 BIRTH, LIFE AND DEATH OF STARS 11.1 C. Red Giant star√ E. White Dwarf star √ (2) 11.2 Hydrogen in the centre of a star is depleted (used up) √. The star’s core shrinks and heats up √. The outer part expands √ and the star becomes larger and glows red.√ (4) 11.3 Red Giant stage √ (1) 11.4 Supernova √ (1) (8) TOTAL SECTION C: 38 TOTAL: 100 10