16. Which metal is used to make car bodies?
a) Aluminum
b) Iron
c) Copper
d) Silver
Answer: a) Aluminum
17. Which metal is used to make ballpoint pens?
a) Gold
b) Aluminum
c) Copper
d) Tungsten
Answer: d) Tungsten
18. Which metal is used to make water pipes?
a) Copper
b) Aluminum
c) Zinc
d) Iron
Answer: a) Copper
19. Which metal is used to make jet engines?
a) Aluminum
b) Iron
c) Copper
d) Titanium
Answer: d) Titanium
20. Which metal is used to make spark plugs?
a) Copper
b) Iron
c) Zinc
d) Platinum
Answer: d) Platinum
