11. Which metal is the primary component of brass?
a) Copper
b) Zinc
c) Tin
d) Aluminum
Answer: b) Zinc
12. What is the process of shaping metal by hammering or pressing called?
a) Casting
b) Forging
c) Extrusion
d) Machining
Answer: b) Forging
13. Which metal is used as a catalyst in the production of ammonia for fertilizer manufacturing?
a) Nickel
b) Platinum
c) Cobalt
d) Iron
Answer: a) Nickel
14. What is the process of converting iron ore into steel called?
a) Refining
b) Smelting
c) Milling
d) Steelmaking
Answer: d) Steelmaking
15. Which metal is primarily used for making coins?
a) Copper
b) Zinc
c) Silver
d) Aluminum
Answer: c) Silver
