41. Which metal is primarily used for making car batteries due to its ability to store and release electrical energy?
a) Copper
b) Aluminum
c) Iron
d) Lead
42. What is the process of heating a metal to a specific temperature and then slowly cooling it to reduce its hardness called?
a) Annealing
b) Tempering
c) Quenching
d) Forging
43. Which metal is commonly used for making electrical contacts and connectors in electronic devices due to its low electrical resistance?
a) Copper
b) Aluminum
c) Silver
d) Gold
44. What is the process of converting iron ore into a porous mass called?
a) Refining
b) Smelting
c) Milling
d) Sintering
45. Which metal is primarily used for making heat exchangers, condenser tubes, and other applications requiring high corrosion resistance?
a) Copper
b) Aluminum
c) Iron
d) Stainless steel
