The metallic structure of mild steel is_________________?
(A) body centred cubic
(B) face centred cubic
(C) hexagonal close packed
(D) cubic structure
(D) orthorhombic crystal
The percentage of carbon in pig iron varies from___________________?
(A) 0.1 to 1.2%
(B) 1.5 to 2.5%
(C) 2.5 to 4%
(D) 4 to 4.5%
(D) 4.5 to 6.3%.
Pig iron is the name given to________________?
(A) raw material for blast furnace
(B) product of blast furnace made by reduction of iron ore
(C) iron containing huge quantities of carbon
(D) iron in molten form in the ladles
(D) iron scrap
In nodular iron, graphite is in the form of_____________________?
(A) cementite
(B) free carbon
(C) flakes
(D) spheroids
(D) nodular aggregates of graphite
Wrought iron is________________?
(A) hard
(B) high in strength
(C) highly resistant to corrosion
(D) heat treated to change its properties
(D) least resistant to corrosion
Ductility of a material can be defined as__________________?
(A) ability to undergo large permanent deformations in compression
(B) ability to recover its original form
(C) ability to undergo large permanent deformations in tension
(D) all of the above
(D) none of the above
In compression, a prism of brittle material will break________________?
(A) by forming a bulge (l>) by shearing along oblique plane
(B) in direction perpendicular to application of load
(C) by crushing into thousands of pieces
(D) none of the above
Slow plastic defomiation of metals under a constant stress is known as________________?
(A) creep
(B) fatigue
(C) endurance
(D) plastic deformation
(D) non-plastic deformation
The number of electrons in 1 cm3 of metal would be of the order of_______________?
(A) 1010
(B) TO16
(C) 1022
(D) 1040
(D) 1052
The elastic stress strain behaviour of rubber is_____________________?
(A) linear
(B) non-linear
(C) plastic
(D) no fixed relationship
(D) unpredictable behaviour