Understanding Metals and Alloys

What is the main reason most metals have high melting points?

• They have small atoms.

• They have giant structures of atoms with strong bonds.

• They are good conductors of electricity.

• They are mixed with other elements.

Why is copper particularly useful for electrical wiring?

• It is very heavy.

• It is resistant to corrosion.

• It has properties that make it a good conductor of electricity.

• It is an alloy.

What property of aluminium makes it useful for applications where weight is a concern?

• High density

• Low density

• High melting point

• High electrical conductivity

What is an alloy?

• A pure metal

• A mixture of metals with non-metals

• A mixture of a metal with small amounts of other elements

• A metal that is resistant to corrosion

Why are pure iron, gold, and aluminium often not used in their pure form for everyday applications?

• They are too expensive.

• They are too soft.

• They are too heavy.

• They are too rare.

What is the main component of steel?

• Aluminium

• Copper

• Iron

• Gold

What is added to iron to make steel?

• Only carbon

• Only aluminium

• Carbon and other metals

• Only copper

Which of the following is NOT a property of metals?

• High melting points

• Good conductors of electricity

• Low density

• Good conductors of thermal energy

What makes aluminium resistant to corrosion?

• Its high density

• Its ability to form alloys

• Its natural oxide layer

• Its high melting point

Which of the following metals is commonly used in plumbing due to its properties?

• Iron

• Copper

• Aluminium

• Gold