ALLOY

An alloy is harder than its pure metal because the foreign atoms in the alloy

• increase the bond strength between the atoms.

• increase the empty spaces between the atoms.

• react with the pure metal atoms to form a compound.

• reduce the ability of the atoms to slide across each other.

Brass is an alloy consisting of a mixture of

• copper and zinc

• copper and lead

• copper and tin

• tin and lead

The main element present in brass and bronze is

• copper

• lead

• zinc

• tin

Which of the following alloy is used to make the body of an aeroplane?

• Brass

• Duralumin

• Steel

• Pewter

Which of the following is not the aim of alloying?

• To increase the strength and hardness of metal.

• To prevent corrosion of metal.

• To improve the appearance of metal

• To increase the melting point.

What is the composition of brass?

• 30% tin and 70% copper

• 10% tin and 90% copper

• 30% zinc and 70% copper

• 10% zinc and 90% copper

Which of the following statements below is true?

• Copper is more ductile than brass

• Brass is more malleable than copper

• Iron is shinier than stainless steel

• Iron is more resistant to corrosion than steel

Which of the following characteristics belong to pure metals?

I. Ductile

II. Malleable

III. Brittle

IV. Good conductor of electricity

• I and II

• I and IV

• I, II and IV

• I, II, III and IV

Which of the following properties does not belong to an alloy as compared to its pure metal?

• Stronger

• More corrosion resistant

• Harder

• More malleable

Alloy is a ...

• A chemical compound with combination between metal and non-metal

• A salt contain of two or more elements where the main element is non-metal

• Mixture of two or more elements where the main element is metal