Engineering Material Online Quiz questions and answers

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1. Ductility 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

2. 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

3. In compression, a prism of brittle material will break
by forming a bulge	by shearing along oblique plane
in direction perpend cular to application of load	by crushing into thousands of pieces

4. The ability of a material to resist softening at high temperature is known as _____.
creep	hot tempering
hot hardness	fatigue

5. Mild steel belongs to the following category
low carbon steel	medium carbon steel
high carbon steel	alloy steel

6. The ultimate tensile strength of low carbon steel by working at a high strain rate will
decrease	increase
remain constant	first increase and then decrease

7. Slow plastic defomiation of metals under a constant stress is known as _____.
creep	fatigue
endurance	plastic deformation

8. 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

9. The number of electrons in 1 cm3 of metal would be of the order of _____.
1010	1O16
1022	1040

10. Stress relaxation is- the phenomenon
in which parts are not loaded	in which stress remains constant on increasing load
in which deformation tends to loosen the joint and produces a stress reduced	stress reduces on increasing load

11. The elastic stress strain behaviour of rubber is ______.
linear	non-linear
plastic	no fixed relationship

12. 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

13. Recrystallization temperature is one _____.
at which crystals first start forming from molten metal when it is cooled	at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
at which change of allotropic form takes place	at which crystals grow bigger in size

14. 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

15. Delta iron occurs at temperature of _____.
room temperature	above melting point
between 1400°C and 1539°C	between 910°C and 1400°C

16. 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

17. Super conduction by metals is observed in the temperature range of _____.
below 10°K	above 100°K
around 0°C	around 100°C

18. Which of the following constituents of steels is softest and least strong
austenite	pearlite
ferrite	cementlte

19. Which of the following represents the allotropic forms of iron
alpha iron, beta iron and gamma iron	alpha iron and beta iron
body centred cubic a-iron and face centred cubic a-iron	alpha iron, gamma fron and delta iron

20. 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