51. Which metal is commonly used for making beverage cans and foil packaging due to its lightweight and barrier properties?
a) Copper
b) Aluminum
c) Iron
d) Tin
52. What is the process of shaping metal by cutting, drilling, grinding, and other techniques called?
a) Casting
b) Forging
c) Extrusion
d) Machining
53. Which metal is primarily used for making car bodies and construction materials due to its corrosion resistance and lightweight?
a) Copper
b) Aluminum
c) Iron
d) Steel
54. What is the process of removing metal from a workpiece using a rotating cutting tool called?
a) Casting
b) Forging
c) Extrusion
d) Machining
55. Which metal is commonly used for making heat sinks, electrical contacts, and other applications requiring high thermal conductivity?
a) Copper
b) Aluminum
c) Iron
d) Silver
