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Alloys As Useful Materials (chemistry Only) (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Alloys As Useful Materials (chemistry Only)' from the broader topic Using Resources. The test is geared towards the AQA exam board style syllabus.
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An alloy is a mixture of a metal with one or more other elements. Which statement best explains why alloys are often harder than the pure metal they include?
Which protective method works by sacrificial protection for steel structures like pipelines?
Why does adding zinc to copper to make brass change the colour compared with pure copper?
Which alloy would you choose if you need a lightweight, strong material for bicycle frames and aircraft structures?
Why might a manufacturer choose a copper-beryllium alloy (a costly engineered alloy) for precision springs rather than a cheaper steel?
Why is a steel tool that is heat-treated (quenched and tempered) often stronger than the original steel?
When designing an alloy for high-temperature turbine blades, which property is most critical?
Why are alloys generally used in place of pure metals for tools such as hammers and chisels?
Which alloy would you recommend for making a pot that must be non-reactive with food, corrosion-resistant and able to be polished to a bright finish?
Which of the following explains why many electrical wires are NOT made from steel alloys even though steel is strong?
Why is recycling aluminium from used alloy products much more energy-efficient than producing aluminium from its ore (bauxite)?