1) During World War II, scientists used dandelions to make a) cardboard b) paper c) plastic d) rubber 2) The first bicycles had wheels made of a) wood with iron tyres b) iron with rubber tyres c) iron with wooden tyres 3) Which one of these materials did the Ancient Romans not have? a) ceramic b) concrete c) glass d) paper 4) Choose the true sentence(s)  a) All types of wood float in water b) No type of stone floats in water 5) The earliest use of nylon was in a) women's clothing b) toothbrushes c) parachutes d) guitar strings 6) Which of these metals is the hardest? a) aluminium b) copper c) gold d) iron e) steel 7) Which of these metals is the heaviest? a) aluminium b) copper c) gold d) iron e) steel

Solution Pre Unit 9A Materials

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