71. Which metal is commonly used for making electrical contacts and connectors in electronic devices due to its low contact resistance and corrosion resistance?
a) Copper
b) Aluminum
c) Silver
d) Gold
72. What is the process of converting iron ore into iron metal by removing oxygen through a chemical reaction with carbon called?
a) Refining
b) Smelting
c) Milling
d) Reduction
73. Which metal is primarily used for making aircraft engines, missile components, and other high-temperature applications due to its high strength and heat resistance?
a) Copper
b) Aluminum
c) Iron
d) Nickel
74. What is the process of converting iron into steel by removing carbon and other impurities through a controlled oxidation process called?
a) Refining
b) Smelting
c) Milling
d) Bessemerization
75. Which metal is commonly used for making electrical contacts and connectors in electronic devices due to its low electrical resistance and resistance to corrosion?
a) Copper
b) Aluminum
c) Silver
d) Platinum
