26. What is the process of extracting metals from ores using bacteria or other microorganisms called?
a) Bioleaching
b) Smelting
c) Milling
d) Concentration
27. Which metal is commonly used for making cooking utensils and food containers due to its resistance to corrosion and toxicity?
a) Copper
b) Aluminum
c) Iron
d) Stainless steel
28. What is the process of coating a metal surface with a thin layer of another metal called?
a) Galvanization
b) Electroplating
c) Anodizing
d) Tinning
29. Which metal is primarily used for making aircraft structures, missile components, and other aerospace applications?
a) Copper
b) Aluminum
c) Iron
d) Titanium
30. What is the process of separating metal particles from crushed ore using water and chemicals called?
a) Refining
b) Smelting
c) Milling
d) Flotation
