Question 5 Write a sentence to explain each of the following words or phrases: 5.1 open cast mining 5.2 mine dumps 5.3 toxic dust


.


(1) (1) (1)


5.4 Fill in the missing words in these sentences: 5.4.1 Archaeologists have found evidence of vertical shaft mining in South Africa which they estimate to date back to


5.4.2 The first River in 1887. 5.4.3 The mine in the Northern Cape is one of the largest open pit mines in the world.


(1) [6]


Question 6 6.1 A bicycle has a rear wheel of 60 cm diameter. How many revolutions will it make to cover a distance of 1 000 metres? State your answer to the nearest whole number.


was discovered on the banks of the Orange (1) (1)


(1)


6.2 A crank gear has 60 teeth and the rear wheel gear has 20 teeth. How many times will the crank gear have to turn to produce the number of revolutions needed for the 60 cm wheel to cover the 1 000 metres? (1)


6.3 Which of the following rear cogs would make it easier to climb a hill; one with 18 teeth or one with 26 teeth?


6.4 Mining in South Africa has been a male dominated profession. Write a paragraph giving three reasons why you think this should change.


Question 7 Write a short description of each of the following three terms: 7.1 Input devices 7.2 Process


7.3 Output devices


Question 8 Give the term for each of the following definitions: 81 likely to happen 8.2 flow of an electrical charge through an electrical conductor 8.3 difference of electrical potential between two points 8.4 a machine that producers electricity 8.5 produces electricity using energy from the sun


Question 9 Explain the difference between electrochemical and photovoltaic cells.


(1)


(3) [6]


(2) (2)


(2) [6]


[5] [8]


Question 10 10.1 Describe what the differences are between generating power with and without heat, and give suitable examples.


10.2 List the advantages and disadvantages of generating electricity with and without heat.


(5)


(4) [9]


Total: 100 marks Term 4 Exemplar exam 155


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