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MCQs 1: Malleability of a material can be defined as ______________________?

ability to undergo large permanent deformations in compression ability to recover its original form ability to undergo large permanent deformations in tension all of the above none of the above
Answer Explanation

MCQs 2: Mild steel belongs to the following category___________________?

low carbon steel medium carbon steel high carbon steel alloy steel special steel
Answer Explanation

MCQs 3: Stress relaxation is- the phenomenon ___________________?

in which parts are not loaded in which stress remains constant on in-creasing load in which deformation tends to loosen the joint and produces a stress reduced stress reduces on increasing load none of the above
Answer Explanation

MCQs 4: Isotropic materials are those which have the same ____________________?

elastic properties in all directions stresses induced in all directions thermal properties in all directions electric and magnetic properties in all directions density throughout
Answer Explanation

MCQs 5: The ability of a material to resist softening at high temperature is known as____________________?

creep hot tempering hot hardness fatigue superhardening
Answer Explanation

MCQs 6: The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________?

increase decrease remain same first increase and then decrease show unpredictable behaviour
Answer Explanation

MCQs 7: Points of arrest for iron correspond to__________________?

stages at which allotropic forms change stages at which further heating does not increase temperature for some time stages at which properties do not change with increase in temperature there is nothing like points of arrest none of the above
Answer Explanation

MCQs 8: A material is known as allotropic or polymorphic if it __________________?

has a fixed structure under all conditions exists in several crystal forms at different temperatures responds to heat treatment has its atoms distributed in a random pattern none of the above
Answer Explanation

MCQs 9: Which of the following constituents of steels is softest and least strong ________________?

austenite pearlite ferrite cementlte bainite
Answer Explanation

MCQs 10: The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?

770°C 910°C 1050°C below recrystallisation temperature above recrystallization temperature
Answer Explanation

MCQs 11: Ferromagnetic alpha iron exists in temperature range of________________?

below 723°C 770 – 910°C 910-1440°C 1400-1539°C above 1539°C
Answer Explanation

MCQs 12: A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?

molecular change physical change allotropic change solidus change atomic change
Answer Explanation

MCQs 13: The crystal of alpha iron is ____________________?

body centred cubic face centred cubic hexagonal close packed cubic structure orthorhombic crystal
Answer Explanation

MCQs 14: For the allotropic forms of iron, the points of arrest are __________________?

the points where no further change oc-curs constant for all metals the points where there is no further flow of metal the points of discontinuity the points where major changes take place
Answer Explanation

MCQs 15: The percentage of carbon in grey iron castings usually varies between __________________?

0.5 to 1% 1 – 2% 2.5 to 4.5% 5 – 7% 7-9%.
Answer Explanation

MCQs 16: The unique property of cast iron is its high ___________________?

malleability ductility surface finish damping characteristics hardness
Answer Explanation

MCQs 17: In grey cast iron, carbon is present in the form of____________________?

cementite free carbon flakes spheroids nodular aggregates of graphite
Answer Explanation

MCQs 18: In malleable iron, carbon is present in the form of___________________?

cementite free carbon flakes spheroids nodular aggregates of graphite
Answer Explanation

MCQs 19: The following types of materials are usually the most ductile__________________?

face-centred cubic lattice body-centred cubic lattice hexagonal close-packed lattice all of the above none of the above
Answer Explanation

MCQs 20: Sulphur in pig iron tends to make it___________________?

hard soft ductile tough malleable
Answer Explanation

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