11. Which metal is used to make airplane parts?
a) Aluminum
b) Iron
c) Copper
d) Silver
12. Which metal is used to make nuclear reactors?
a) Copper
b) Iron
c) Uranium
d) Silver
13. Which metal is used to make lead-acid batteries?
a) Zinc
b) Iron
c) Copper
d) Lead
14. Which metal is used to make coins in the United States?
a) Gold
b) Silver
c) Copper
d) Nickel
15. Which metal is used to make jewelry?
a) Gold
b) Aluminum
c) Copper
d) Iron