1) Objects made of _______________ can become rusty. a) iron b) gold c) alluminium 2) The characteristic of a rusty objects is_______ a) smooth surface b) reddish-brown colour c) strong 3) The presence of _________and ___________cause of objects made of iron. a) water /oxygen b) air / nitrogen c) water / carbon dioxide 4) _____________can rust if exposed to water and air. a) plastic spoon b) iron rod c) copper cup 5) Rust increase the _________of an object. a) mass b) volume c) size 6) Anhydrous calcium chloride is used to absorb___________________ a) moisture b) dry c) oil 7) Boiled water does not contain any ____________ a) water b) air c) nitrogen 8) ___________is used to prevent air from entering the water. a) milk b) honey c) oil 9) ____________ is applied on the surface of objects made of iron. a) Painting b) Spraying c) Immersing 10) The importance of preventing rusting of object made of iron is___________ a) safe to be used b) look unpleasant c) easily damaged

RUSTING YEAR 5

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