Metals

56. Which of the following metals is used as a coating for iron and steel to prevent rusting?
a) Zinc
b) Copper
c) Aluminium
d) Silver

57. Which of the following metals is used in dental fillings?
a) Copper
b) Aluminium
c) Mercury
d) Silver

58. Which of the following metals is used as a superconductor at very low temperatures?
a) Iron
b) Copper
c) Aluminium
d) Mercury

59. What is the main use of magnesium?
a) Manufacturing of steel
b) Making batteries
c) Construction
d) Producing fireworks

60. Which of the following metals is used in the production of semiconductors?
a) Gold
b) Silver
c) Copper
d) Silicon