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engineering materials MCQs

Practise focused engineering materials questions with marked answers for exam preparation and subject revision.

engineering materials Mcqs
1. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00C will _________________?
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A. decrease

B. remain same

C. show unpredictable behaviour

D. increase

E. first increase and then decrease

2. The unique property of cast iron is its high ___________________?
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A. ductility

B. hardness

C. damping characteristics

D. malleability

E. surface finish

3. A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
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A. molecular change

B. allotropic change

C. atomic change

D. solidus change

E. physical change

4. Malleability of a material can be defined as ______________________?
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A. all of the above

B. ability to undergo large permanent deformations in compression

C. none of the above

D. ability to undergo large permanent deformations in tension

E. ability to recover its original form

5. The ability of a material to resist softening at high temperature is known as____________________?
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A. creep

B. hot hardness

C. superhardening

D. hot tempering

E. fatigue

6. Points of arrest for iron correspond to__________________?
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A. stages at which properties do not change with increase in temperature

B. there is nothing like points of arrest

C. none of the above

D. stages at which further heating does not increase temperature for some time

E. stages at which allotropic forms change
7. The crystal of alpha iron is ____________________?
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A. cubic structure

B. hexagonal close packed

C. orthorhombic crystal

D. body centred cubic

E. face centred cubic

8. Isotropic materials are those which have the same ____________________?
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A. stresses induced in all directions

B. density throughout

C. elastic properties in all directions

D. thermal properties in all directions

E. electric and magnetic properties in all directions

9. Stress relaxation is- the phenomenon ___________________?
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A. none of the above

B. in which stress remains constant on in-creasing load

C. stress reduces on increasing load

D. in which parts are not loaded

E. in which deformation tends to loosen the joint and produces a stress reduced
10. Ferromagnetic alpha iron exists in temperature range of________________?
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A. below 723C

B. 1400-1539C

C. 910-1440C

D. above 1539C

E. 770 910C

11. A material is known as allotropic or polymorphic if it __________________?
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A. has its atoms distributed in a random pattern

B. none of the above

C. responds to heat treatment

D. has a fixed structure under all conditions

E. exists in several crystal forms at different temperatures
12. The percentage of carbon in grey iron castings usually varies between __________________?
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A. 5 7%

B. 1 2%

C. 7-9%.

D. 2.5 to 4.5%

E. 0.5 to 1%

13. Mild steel belongs to the following category___________________?
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A. low carbon steel

B. special steel

C. high carbon steel

D. medium carbon steel

E. alloy steel

14. For the allotropic forms of iron, the points of arrest are __________________?
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A. the points where major changes take place

B. constant for all metals

C. the points of discontinuity

D. the points where no further change oc-curs

E. the points where there is no further flow of metal

15. Which of the following constituents of steels is softest and least strong ________________?
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A. cementlte

B. ferrite

C. bainite

D. austenite

E. pearlite

16. In grey cast iron, carbon is present in the form of____________________?
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A. flakes

B. free carbon

C. nodular aggregates of graphite

D. cementite

E. spheroids

17. The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?
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A. 1050C

B. below recrystallisation temperature

C. above recrystallization temperature

D. 910C

E. 770C
18. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as________________?
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A. visco elasticity

B. hysteresis

C. creep

D. inelasticity

E. Boeschinger effect
19. Blast furnace produces following by reduction of iron ore_______________?
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A. white iron

B. pig iron

C. malleable iron

D. wrought iron

E. cast iron

20. Machining properties of steel are improved by adding___________________?
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A. chromium, nickel

B. lubricants

C. sulphur, lead, phosphorous

D. silicon, aluminium, titanium

E. vanadium, aluminium