1) Iron rusts in the presence of a) Water and oxygen b) Oxygen only c) Water only d) Water and carbon dioxide 2) Rusting is a) The corrosion of metals b) The corrosion of iron only c) The corrosion of steel only d) The corrosion of iron and steel 3) Barriers to protect against rusting are a) Paint b) Grease c) Paint, plastic, grease, oils d) Oils e) Plastic, greasing and lubrication 4) Sacrificial protection involves using a) A metal less reactive than iron b) A metal more reactive than iron c) A metal of the same reactivity as iron 5) In sacrificial protection, the protective metal a) Oxidises less easily than iron b) Oxidises more easily than iron c) Oxidises in the same way as iron 6) In sacrificial protection, electrons leave zinc and a) Join with oxygen b) Stay in the metal c) Flow to iron 7) Galvanising involves using a) Iron b) Steel c) Magnesium d) Zinc e) Silver 8) Galvanising is a) A barrier method b) A sacrificial protection method c) A combination of the two

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