BT HBEL 7

Metals are commonly found in nature. In which of these forms do they naturally occur?

• As pure elements only

• As ores in rocks

• As synthetic compounds

• As artificial alloys

Which of the following metals is best known for its use in electrical wiring due to its high conductivity?

• Iron

• Aluminium

• Copper

• Lead

Aluminium is widely used in making airplanes because...

• It is highly reactive

• It is heavy

• It is lightweight and corrosion-resistant

• It is brittle

Which property allows metals to be drawn into thin wires?

• Conductivity

• Malleability

• Brittleness

• Ductility

Which of the following metals is an example of a ferrous metal?

• Copper

• Iron

• Aluminium

• Zinc

Bronze is an example of an alloy made from _______.

• Silver and gold

• Aluminium and nickel

• Copper and tin

• Iron and zinc

Which of the following factors influences an artist’s choice of metal for a sculpture?

• Cost and availability

• Resistance to corrosion

• Malleability

• All of the above

Which metal is most commonly used in construction due to its strength and durability?

• Copper

• Iron

• Gold

• Lead

Which process is used to prevent metal corrosion?

a) Heating the metal (b) Coating with paint or galvanizing (c) Mixing with other metals

(d) Exposing it to moisture

• Coating with paint or galvanizing

• Mixing with other metals

• Heating the metal

• Exposing it to moisture

What is the primary cause of rusting in iron?

• Exposure to acids

• Contact with other metals

• Reaction with oxygen and water 

• High temperatures