The hardest material just prior to diamond in Mhos scale is_________________?
A. Topaz
B. Carborundum
C. Corundum
D. Calcite
Materials and Construction
Carbon is present in the combined form (carbide) in case of______________________?
Carbon is present in the combined form (carbide) in case of______________________?
A. Pig iron
B. Steel
C. Ferroalloys
D. All A., B. & C.
Polymorphism is not exhibited by______________________?
Polymorphism is not exhibited by______________________?
A. Carbon
B. Iron
C. Phosphorous
D. None of these
Gun metal is an alloy of_________________________?
Gun metal is an alloy of_________________________?
A. Nickel, tin and copper
B. Copper, tin and zinc
C. Copper, phosphorus and nickel
D. Manganese, phosphorus and nickel
Metalloid is_______________________?
Metalloid is_______________________?
A. An element, which exhibits the properties of both metal & non metal
B. Highly electronegative in nature
C. An alloy
D. All A., B. & C.
Tin coating on metals is not done by_____________________?
Tin coating on metals is not done by_____________________?
A. Spraying
B. Powder metallurgy
C. Hot dipg
D. Electro-deposition
_____________ iron is produced, when molten pig iron is chilled suddenly?
_____________ iron is produced, when molten pig iron is chilled suddenly?
A. White cast
B. Grey cast
C. Wrought
D. None of these
Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is _____________ percent?
Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is _____________ percent?
A. 0.02
B. 0.2
C. 0.35
D. 0.5
Which of the following is the most prone to atmospheric corrosion ?
Which of the following is the most prone to atmospheric corrosion ?
A. Silver
B. Iron
C. Tin
D. Copper
Cast iron compared to steel is better in__________________?
Cast iron compared to steel is better in__________________?
A. Ductility
B. Fluidity & castability
C. Strength
D. Malleability