76. What is the process of converting iron into steel by blowing oxygen through the molten iron to remove impurities called?
a) Refining
b) Smelting
c) Milling
d) Oxygenation
77. Which metal is primarily used for making electrical contacts and connectors in electronic devices due to its low contact resistance and reliability?
a) Copper
b) Aluminum
c) Silver
d) Palladium
78. What is the process of converting iron into steel by heating the iron with a reducing agent to remove impurities called?
a) Refining
b) Smelting
c) Milling
d) Steelmaking
79. Which metal is commonly used for making aerospace components, turbine blades, and other high-temperature applications due to its excellent strength and heat resistance?
a) Copper
b) Aluminum
c) Iron
d) Inconel
80. What is the process of converting iron ore into pig iron by heating the ore with a reducing agent in a blast furnace called?
a) Refining
b) Smelting
c) Milling
d) Blast-furnacing
