Natural Sciences Grade 9 P1 Eastern Cape November 2019 QP

GAUTENG DEPARTMENT OF EDUCATION PROVINCIAL EXAMINATION 2015 GRADE 9 NATURAL SCIENCES MARKS: 80 TIME: 2 hours 9 pages P.T.O.

NATURAL SCIENCES 2 GAUTENG DEPARTMENT OF EDUCATION PROVINCIAL EXAMINATION NATURAL SCIENCES Marks: 80 Time: 2 hours INSTRUCTIONS AND INFORMATION 1. This question paper consists of SECTION A and SECTION B based on the prescribed content framework in the CAPS document. 2. This examination paper consists of SEVEN questions. 3. Answer ALL questions. 4. Follow the instructions and numbering of each question. 5. All drawings should be done in pencil and labelled in blue or black ink. 6. Non-programmable calculators, protractors and compasses may be used. 7. Write neatly and legibly. P.T.O.

NATURAL SCIENCES 3 SECTION A QUESTION 1 MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the correct option and write only the letter (A, B, C or D) next to the question number (1.1–1.6) in your answer book. 1.1 The force that pulls us towards the centre of the earth A Gravitational force B Magnetic force C Applied force D Frictional force (2) 1.2 This gas forms 21 % of the atmosphere and is essential for living organisms. A Ozone B Hydrogen C Oxygen D Carbon dioxide (2) 1.3 The main rock types are formed from molten rock in the following order: A Metamorphic, sedimentary, igneous, magma B Sedimentary, metamorphic, magma, igneous C Igneous, magma, metamorphic, sedimentary D Magma, igneous, sedimentary, metamorphic (2) 1.4 The gas found in the atmosphere, that is causing global warming, is … A Ozone. B Hydrogen. C Oxygen. D Carbon dioxide. (2) P.T.O.

NATURAL SCIENCES 4 1.5 If a circuit has a current of 6 amperes and a resistance of 3 ohm, calculate the voltage. A 12 V B 18 V C 3V D 0.5 V (2) 1.6 A series circuit has one light bulb. If another light bulb is added in series … A the voltage decreases and the current increases. B the voltage increases but the current decreases. C the voltage decreases but current increases. D the voltage increases and the current increases. (2) (12) P.T.O.

NATURAL SCIENCES 5 QUESTION 2 TERMINOLOGY Give the correct scientific term for each of the following descriptions. Write only the term next to the question number (2.1–2.6) on the answer sheet. 2.1 Friction, tension and compression are examples of ... forces. (1) 2.2 The mixture of oxygen, nitrogen, carbon dioxide and other gases (1) 2.3 The natural phenomenon that warms the atmosphere sufficiently to sustain life (1) 2.4 Rock from which a metal can be extracted (1) 2.5 A group of electric cells that are connected together (1) 2.6 A component made of material that allows an electric current to flow through it (1) (6) QUESTION 3 MATCHING Choose an item from COLUMN B that matches the statement in COLUMN A. Write only the letter (A–H) next to the question number (3.1–3.6) on the answer sheet, for example 3.7. K COLUMN A COLUMN B 3.1 An instrument used to measure voltage A National grid 3.2 The system of power stations, generators B Planetary Nebula transmission lines and transformers C Igneous rock 3.3 The unit in which the strength of electric current is measured D Voltmeter 3.4 Rock that forms from layers of sand, silt E Ampere clay F Sedimentary rock 3.5 A solid object from space that has landed on the Earth G Meteorite 3.6 Gases ejected by a star to form a cloud H Star around the star (6x1)=(6) (6) TOTAL SECTION A: [24] P.T.O.

NATURAL SCIENCES 6 SECTION B QUESTION 4 Read the following case study and answer the questions that follow. How is iron extracted from iron ore Iron is one of the most common, cheapest and most important metals. It is used in many structures such as buildings, bridges and goods such as metal poles, motor cars, nails and fences. The extraction of iron from iron ore is not a new idea. Thousands of years ago, many men in South Africa were metal workers who extracted iron from iron ore. Today, a large amount of iron is extracted from iron ore in huge blast furnaces. The extraction of iron from iron ore needs several chemical processes. Use the steps below to answer the questions. 1. Iron ore, coke and limestone are added at the top of a blast furnace. Limestone (calcium carbonate) decomposes at high temperatures inside the blast furnace to form calcium oxide and carbon dioxide escapes through the top of the blast furnace. The calcium oxide that is formed reacts with the main impurity in the ore, which is sand (silicon oxide) to make a waste compound called slag (calcium silicate). The molten slag falls to the bottom of the furnace where it floats on the molten iron. The slag is tapped off and used to make cement. 2. Blasts of hot air are blown in through small holes near the bottom of the furnace. This is what gives the furnace its name: blast furnace. The hot air burns the carbon in the coke to form the gas, carbon monoxide. This reaction gives off lots of heat and the temperature in the furnace reaches 2 000oC. 3. The carbon monoxide reacts with the iron oxide to form iron and carbon dioxide. The carbon dioxide escapes through the top of the blast furnace. 4. The iron is so hot that it forms a liquid which collects at the bottom of the blast furnace. 5. The molten iron is used immediately to make steel or it is poured into moulds so that it can cool down and solidify. 4.1 What substances are mixed with iron ore in the blast furnace? (2) 4.2 What gas is given off during the extraction process? (1) 4.3 Why is this furnace called a blast furnace? (2) 4.4 Suggest TWO ways in which the extraction of iron may have an impact on the environment. (4) P.T.O.

NATURAL SCIENCES 7 4.5 From which part of the earth can valuable minerals be extracted? (1) 4.6 Give TWO examples of minerals that are used in their natural form. (2) (12) QUESTION 5 Study the table below and answer the question that follows. Altitude (km) Temperature (oC) Altitude (km) Temperature (oC) 0 15 50 -2 5 -19 55 -7 10 -49 60 -17 15 -56 65 -33 20 -56 70 -54 25 -51 75 -65 30 -44 80 -79 35 -37 84 -86 40 -22 92 -86 45 -8 95 -81 48 -2 100 -72 Use the table to draw a graph showing how temperature changes with altitude. Use a horizontal scale of 1 cm for every 10 oC and a vertical scale of 1 cm for every 5 km. Join the points with a smooth curve. (Use the rubric as a guideline when drawing the graph.) (15) Rubric Assessment Criteria Mark Allocation Correct type of graph 1 Title/heading for graph 2 Correct label for x-axis: 1 Temperature (oC) Correct label for y-axis: 1 Altitude (km) Appropriate scale for x- 1: units appropriate; 1: equal intervals between units axis Appropriate scale for y- 1: correct values; 1: equal intervals between values axis Plotting the points 3: All values 2: Some 1: Only a few 0: No values plotted values plotted values plotted plotted correctly correctly correctly correctly Insert all labels on graph 3: All labels 2: Some 1: Only some 0: No labels such as thermosphere, are indicated labels are labels are are indicated mesosphere, stratosphere, indicated indicated troposphere, tropopause, ozone, stratopause and mesopause (15) P.T.O.

NATURAL SCIENCES 8 QUESTION 6 Study the circuit diagram below and answer the questions that follow. V1 9V A1 6 A V2 A S1 A2 2 A S2 B A3 V3 6.1 6.1.1 What are the values of V2 and V3? (1) 6.1.2 What would the reading on A2 show if switch S2 is opened? Give a reason for your answer. (2) 6.1.3 Which bulb, A or B, has the higher resistance? Explain your answer. (3) 6.1.4 Calculate the resistance of Bulb A and Bulb B. (6) 6.2 To make a cup of coffee, water is boiled for 2 minutes in a kettle that uses 2 000 W. 6.2.1 Calculate the total energy consumption during the two minutes. (2) 6.2.2 Calculate the cost for the total consumption, if the unit price is 120 c. (5) (19) P.T.O.

NATURAL SCIENCES 9 QUESTION 7 Study the diagram below of the apparatus illustrating a wet cell and answer the questions that follow. Using a lemon as a cell 7.1 What is the specific scientific name for a battery? (2) 7.2 What is the function of the light bulb in this experiment? (2) 7.3 Which kind of a reaction occurs at the copper plate electrode? (1) 7.4 How do batteries generally work? (3) 7.5 What is an electrolyte? (2) (10) TOTAL SECTION B: [56] TOTAL: 80 END