Important Alloys and Their Components CDS Questions

CDS Chemistry

Important Alloys and Their Components MCQ Questions


13.
What is the primary reason that stainless steel cutlery and kitchen utensils do not rust the way ordinary iron items do?
A.
They are coated with a layer of paint
B.
The chromium content forms a protective oxide layer that isolates the iron from oxygen and moisture
C.
They are kept permanently dry during use
D.
They contain no iron at all
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ANSWER :
B. The chromium content forms a protective oxide layer that isolates the iron from oxygen and moisture
14.
The term '18/8 stainless steel', commonly used for cutlery and cookware, refers to an alloy containing approximately:
A.
18% carbon and 8% iron
B.
18% chromium and 8% nickel
C.
18% copper and 8% zinc
D.
18% tin and 8% lead
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ANSWER :
B. 18% chromium and 8% nickel
15.
Which statement correctly distinguishes the typical compositions of brass and bronze?
A.
Both brass and bronze have identical compositions
B.
Brass is iron and chromium; bronze is iron and nickel
C.
Brass is copper and tin; bronze is copper and zinc
D.
Brass is copper and zinc; bronze is copper and tin
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ANSWER :
D. Brass is copper and zinc; bronze is copper and tin
16.
Bell metal, a specific bronze variant with a higher proportion of tin, is primarily valued for its:
A.
Sonorous (ringing) quality when struck
B.
Extremely low density
C.
High electrical resistance
D.
Magnetic properties
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ANSWER :
A. Sonorous (ringing) quality when struck
17.
Stainless steel is generally classified as a 'ferrous' alloy mainly because its primary base metal is:
A.
Iron
B.
Nickel
C.
Aluminium
D.
Copper
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ANSWER :
A. Iron
18.
Which of the following is generally NOT a typical use of brass, given its mechanical limitations?
A.
Construction of heavy load-bearing bridge girders
B.
Manufacture of cartridge cases
C.
Manufacture of decorative fittings
D.
Manufacture of musical instruments
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ANSWER :
A. Construction of heavy load-bearing bridge girders