Question
Which statements about the uses of metals are correct?
1 Iron is used to make aircraft because iron has a low density.
2 Copper is used to make electric cables because copper is a good conductor of electricity.
3 Aluminium is used to make brass because aluminium is strong and hard.
4 Iron is mixed with additives to make an alloy used in chemical plant.
A 1 and 2 B 3 and 4 C 1 and 3 D 2 and 4
Answer/Explanation
Ans: D
Question
The diagram shows a section of an overhead power cable.
Which statement explains why a particular substance is used?
A Aluminium has a low density and is a good conductor of electricity.
B Ceramic is a good conductor of electricity.
C Steel can rust in damp air.
D Steel is more dense than aluminium.
Answer/Explanation
Ans: A
Question
Why is aluminium used to make containers for storing food?
A. It conducts electricity.
B. It has a high melting point.
C. It is resistant to corrosion.
D. It is strong.
Answer/Explanation
Ans:
C
Question
What is the symbol of the metal used in the manufacture of aircraft because of its strength and low density?
A Al B Cu C Fe D Zn
▶️Answer/Explanation
Ans:A