CIE iGCSE Co-Ordinated Science C9.3 Alloys and their properties Exam Style Questions Paper 1
Question
Duralumin and magnalium are alloys used in the manufacture of aircraft.
They both contain aluminium and another metallic element.
The alloys are made up of ……1…… of each element.
They are used because they are ……2…… than the pure metals.
Which words complete gaps 1 and 2?
▶️Answer/Explanation
Ans :A
Question
Metal X is extracted from its ore by heating the ore with carbon.
Which statement explains why carbon is used?
(A) Carbon is a non-metal.
(B) Carbon is more reactive than X.
(C) Carbon reacts with oxygen in the air.
(D) Carbon is less reactive than X.
▶️Answer/Explanation
Ans: B
Question
Alloys are formed by dissolving one metal in another.
Alloys are ……1…… .
……2…… alloys conduct electricity.
Which words complete gaps 1 and 2?
▶️Answer/Explanation
Ans : C
Question
Which process is used to increase the hardness of a metal?
(A) Mix the metal with a gas.
(B) Mix the metal with another element.
(C) Mix the metal with a polymer.
(D) Mix the metal with its ore.
▶️Answer/Explanation
Ans: B
Question
Zinc is mixed with molten element X.
A new material, Y, is made.
Y conducts electricity.
Which type of substance is Y?
A. alloy
B. covalent compound
C. macromolecule
D. ionic compound
▶️Answer/Explanation
Answer: A. alloy
Explanation: Alloys are mixtures of metals that conduct electricity. Since Y is formed by mixing zinc with another element and it conducts electricity, it is likely an alloy.
Question
Why does the steel used to make a drill contain manganese?
A to increase the density of the steel
B to increase the hardness of the steel
C to increase the malleability of the steel
D to increase the melting point of the steel
▶️Answer/Explanation
Answer: B to increase the hardness of the steel
Explanation: Manganese is added to steel to increase its hardness and strength. This makes the steel more suitable for use in tools like drills, which need to be durable and resistant to wear.