111. Which metal is the primary constituent of stainless steel?
a) Aluminum
b) Copper
c) Iron
d) Chromium
View Answer
Correct answer: c) Iron
Explanation: Stainless steel is an alloy of iron with a minimum of 10.5% chromium, which provides excellent corrosion resistance and other desirable properties.
112. Which metal is commonly used as a protective coating on aluminum to enhance its corrosion resistance?
a) Copper
b) Zinc
c) Chromium
d) Nickel
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Correct answer: b) Zinc
Explanation: Zinc is often used as a protective coating (galvanizing) on aluminum to improve its corrosion resistance and extend its service life.
113. Which metal is known for its light weight and is commonly used in aerospace and transportation industries?
a) Aluminum
b) Copper
c) Steel
d) Titanium
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Correct answer: a) Aluminum
Explanation: Aluminum is prized for its low density and high strength-to-weight ratio, making it a popular choice in industries such as aerospace and transportation.
114. Which metal is commonly used for weatherproofing and cladding systems due to its durability and aesthetic appeal?
a) Aluminum
b) Copper
c) Zinc
d) Stainless steel
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Correct answer: b) Copper
Explanation: Copper is often used for weatherproofing and cladding systems due to its corrosion resistance, longevity, and attractive patina.
115. Which metal is widely used for the production of coins, electrical contacts, and jewelry?
a) Aluminum
b) Copper
c) Nickel
d) Silver
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Correct answer: d) Silver
Explanation: Silver is commonly used for the production of coins, electrical contacts, and jewelry due to its high conductivity and aesthetic appeal.
116. Which metal is known for its exceptional strength, low density, and resistance to corrosion?
a) Aluminum
b) Copper
c) Iron
d) Titanium
View Answer
Correct answer: d) Titanium
Explanation: Titanium exhibits high strength, low density, and excellent corrosion resistance, making it suitable for various applications, including aerospace, medical, and marine industries.
117. Which metal is commonly used as a coating on steel to provide a decorative finish and enhanced corrosion resistance?
a) Aluminum
b) Copper
c) Zinc
d) Chromium
View Answer
Correct answer: d) Chromium
Explanation: Chromium is often used as a coating on steel to provide a decorative finish, increase corrosion resistance, and improve wear resistance.
118. Which metal is highly resistant to oxidation and is used in high-temperature applications, such as gas turbines?
a) Aluminum
b) Copper
c) Iron
d) Nickel
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Correct answer: d) Nickel
Explanation: Nickel exhibits high resistance to oxidation and is commonly used in high-temperature applications, including gas turbines and jet engines.
119. Which metal is commonly used for the production of car bodies and structural components in the automotive industry?
a) Aluminum
b) Copper
c) Steel
d) Titanium
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Correct answer: c) Steel
Explanation: Steel is widely used in the automotive industry for car bodies and structural components due to its strength, crash resistance, and cost-effectiveness.
120. Which metal is known for its excellent malleability and is commonly used for sheet metal applications?
a) Aluminum
b) Copper
c) Iron
d) Zinc
View Answer
Correct answer: a) Aluminum
Explanation: Aluminum is highly malleable, making it suitable for sheet metal applications such as roofing, automotive body panels, and packaging.
