When iron is rusted it is
A.reduced
B.decomposed
C.oxidised
D.changed in a fine powder
Category: Materials of Construction Mcqs
A chemical change occurs when iron
A.rusts
B.is magnetised
C.is heated
D.melts
A substance is said to be malleable if it
A.does not react with acids and alkalies
B.can be hammered to thin sheets
C.has a very high melting point
D.has a metallic lustre
Electrochemical corrosion processes
A.are accempanied by a flow of current from anodic to cathodic areas in the electrolyte
B.are accompanied by a flow of current from cathodic to anodic areas in the electrolyte
C.involve exchange of protons
D.none of the above
The total carbon content in pig iron may be
A.0.08 to 0.02 %
B.0.1 to 1.5 %
C.3.0 to 3.5 %
D.16 to 24 %
An alloy is
A.an intermetallic compound
B.a solid substance containing two or more metallic elements
C.a metallic material containing at least one metallic element
D.a metallic material containing at least one non-matallic element
Corrosion resisting chromium – nickel steels contain
A.16-24% Cr 7-12% Ni 1.5-2.0 Mn
B.35-36% Cr 1.5-2.0% Ni 8-14% Mn
C.7-12% Cr 1.5-2.0% Ni 16-24 Mn
D.1.5-2.0% Cr 7-12% Ni 16-24% Mn
White cast iron is produced
A.when molten pig iron is allowed to cool gradually
B.when molten pig iron is chilled suddenly
C.when grey cast iron is subjected to slow prolonged heating
D.none of the above
Austenitic stainless steel is characterized by
A.a body-centred cubic crystal structure
B.a face-centred cubic crystal structure
C.a simple hexagonal crystal structure
D.none of the above
