1) A layer of reddish brown on surface of a metal is called a) Rust b) Brown paint c) Dirt d) Red layer 2) Which of the following will NOT happen to an iron nail that is exposed to damp air for few weeks a) Iron nail becomes easily broken b) Iron nail becomes coated with a reddish brown coat c) Iron nail remains shiny and strong d) Iron nail appears dirty, dull and rough 3) What causes metal objects to rust? a) Air and fire b) Water and air c) Gas and oil d) Nitrogen and carbon dioxide 4) Diagram shows an object. Which of the following objects can be grouped in the same group as the object shown? a) Slippers b) Wooden chopstick c) Books d) Needle 5) Objects that can rust is made up of a) Gold b) Metal c) Plastics d) Silver 6) Choose an object that can rust a) Dress b) Ball c) Razor blade d) Plant pot 7) Which of the following objects will rust and do not rust? a) D b) B c) A d) C 8) How can rusted object be differentiate with not rusted object? a) Rusted object appears shiny while not rusted object appears dull b) Rusted object has a smooth surface while not rusted object has a rough surface c) Rusted object is coated with reddish brown coat while not rusted object appears shiny d) Rusted object is stronger than not rusted object

RUSTING TOPIC 7

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