TERM 4 Exemplar exam
Question 1 1.1 Explain how concrete can be made stronger.
1.2 A material that shatters when hit by hammer is called a material.
1.3 Give two disadvantages of cantilever bridges.
1.4 Sketch and label a cantilevered structure supported by triangulation. Write on the triangulation member whether it is a strut or a tie.
Question 2 2.1 Mechanical advantage is the ratio of load to effort. If a 30 kg learner standing on a lever lifts a teacher who weighs 90 kg, what is the mechanical advantage provided by the lever? Show all your working.
2.2 Write three characteristics of materials you would choose to make fast-moving spur gears.
2.3 Draw and label a mechanism that would turn a larger rotary motion into a smaller but stronger reciprocating motion.
(2)
(1) (2)
(5) [10]
(4) (3) (5)
2.4 The shape of a lever can determine its mechanical advantage and direction of motion. Describe the size of the load and how far it can be moved by a bell crank lever like the one illustrated alongside.
(2)
2.5 Draw the symbols for: 2.5.1 a fixed pivot 2.5.2 a moving pivot
2.6 Give one purpose of lubrication.
(4) (1)
[19]
Question 3 3.1 Some natural fibres are used to make bags. List five plants or animals that produce such fibres.
(5)
3.2 When natural materials are buried in soil, water, insects and microbes break them down into a harmless product that we can use as a fertiliser. What is the name of this product and what do we call the process that produces it?
3.3 Draw up a table that compares the advantages and disadvantages of using natural fibres to make shopping bags.
3.4 Describe two ways to reduce the negative impact of plastic bags on the environment.
3.5 Explain how trusses make the roof of a house stronger? Name the forces involved.
Question 4 Write sentences to explain the following words or phrases: 4.1 a convention – as used in drawing mechanical parts 4.2 a compound gear train 4.3 mechanisation in industry 4.4 a geologist
154 Term 4 Exemplar exam
(2) (6) (6) (4) [23]
(4 × 2) [8]
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