CIE iGCSE Co-Ordinated Science C9.3 Alloys and their properties Exam Style Questions Paper 2
Question
When iron is galvanized, it is coated with a layer of zinc.
Which statements about galvanizing are correct?
1 Zinc has a greater tendency to form positive ions than iron.
2 Zinc prevents iron from rusting by sacrificial protection.
3 Iron is more reactive than zinc.
4 Zinc acts as a barrier method of rust prevention if scratched.
(A) 1 and 2
(B 1 and 4
(C) 2 and 3
(D) 3 and 4
▶️Answer/Explanation
Ans : A
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
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
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
Explanation: Manganese is added to steel to increase its hardness and strength, making it suitable for use in tools like drills.