121. Which metal is commonly used for electrical transmission linesdue to its high conductivity and low electrical resistance?
a) Aluminum
b) Copper
c) Zinc
d) Silver
View Answer
Correct answer: b) Copper
Explanation: Copper is widely used for electrical transmission lines due to its high electrical conductivity, low electrical resistance, and ability to carry large amounts of current.
122. Which metal is commonly used for heat sinks in electronic devices to dissipate heat?
a) Aluminum
b) Copper
c) Iron
d) Nickel
View Answer
Correct answer: a) Aluminum
Explanation: Aluminum is often used as a heat sink in electronic devices due to its excellent thermal conductivity and ability to dissipate heat efficiently.
123. Which metal is commonly used for water piping systems due to its corrosion resistance and low toxicity?
a) Aluminum
b) Copper
c) Iron
d) Stainless steel
View Answer
Correct answer: b) Copper
Explanation: Copper is frequently used for water piping systems due to its corrosion resistance, durability, low toxicity, and ability to maintain water quality.
124. Which metal is commonly used for the production of kitchen utensils and food processing equipment?
a) Aluminum
b) Copper
c) Stainless steel
d) Nickel
View Answer
Correct answer: c) Stainless steel
Explanation: Stainless steel is often used for kitchen utensils and food processing equipment due to its corrosion resistance, hygiene properties, and ease of cleaning.
125. Which metal is commonly used for the production of magnets and electrical motors?
a) Aluminum
b) Copper
c) Iron
d) Titanium
View Answer
Correct answer: c) Iron
Explanation: Iron is widely used for the production of magnets and electrical motors due to its ferromagnetic properties and ability to create strong magnetic fields.
126. Which metal is commonly used for sacrificial anodes to protect structures from corrosion?
a) Aluminum
b) Copper
c) Iron
d) Zinc
View Answer
Correct answer: d) Zinc
Explanation: Zinc is frequently used as sacrificial anodes in corrosion protection systems to protect structures, such as ships or underground pipelines, from corrosion by sacrificing itself.
127. Which metal is commonly used for the production of coins worldwide?
a) Aluminum
b) Copper
c) Iron
d) Nickel
View Answer
Correct answer: b) Copper
Explanation: Copper is widely used for the production of coins due to its durability, malleability, and resistance to corrosion.
128. Which metal is commonly used for medical implants, such as joint replacements?
a) Aluminum
b) Copper
c) Iron
d) Titanium
View Answer
Correct answer: d) Titanium
Explanation: Titanium is frequently used for medical implants, including joint replacements, due to its biocompatibility, strength, and corrosion resistance.
129. Which metal is commonly used for the production of electrical transformers and power distribution systems?
a) Aluminum
b) Copper
c) Iron
d) Zinc
View Answer
Correct answer: b) Copper
Explanation: Copper is commonly used for electrical transformers and power distribution systems due to its high electrical conductivity and low energy losses.
130. Which metal is commonly used for the production of musical instruments, such as brass instruments?
a) Aluminum
b) Copper
c) Iron
d) Nickel
View Answer
Correct answer: b) Copper
Explanation: Copper, as an alloy in brass, is frequently used for the production of musical instruments, including brass instruments, due to its acoustic properties and malleability.
