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Free download in PDF Engineering Materials Multiple Choice Questions(MCQs) & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The following types of materials are usually the most ductile
[A]
face-centred cubic lattice
[B]
body-centred cubic lattice
[C]
hexagonal close-packed lattice
[D]
all of the above
Answer: face-centred cubic lattice
(2)
Which of the following represents the allotropic forms of iron
[A]
alpha iron, beta iron and gamma iron
[B]
alpha iron and beta iron
[C]
body centred cubic a-iron and face centred cubic a-iron
[D]
alpha iron, gamma from and delta iron
Answer: alpha iron, gamma from and delta iron
(3)
Which of the following constituents of steels is softest and least strong
[A]
austenite
[B]
pearlite
[C]
ferrite
[D]
cementlte
(4)
Super conduction by metals is observed in the temperature range of
[A]
below 10°K
[B]
above 100°K
[C]
around 0°C
[D]
around 100°C
(5)
A material is known as allotropic or polymorphic if it
[A]
has a fixed structure under all conditions
[B]
exists in several crystal forms at different temperatures
[C]
responds to heat treatment
[D]
has its atoms distributed in a random pattern
Answer: exists in several crystal forms at different temperatures
(6)
Delta iron occurs at temperature of
[A]
room temperature
[B]
above melting point
[C]
between 1400°C and 1539°C
[D]
none of the above
Answer: between 1400°C and 1539°C
(7)
Points of arrest for iron correspond to
[A]
stages at which allotropic forms change
[B]
stages at which further heating does not increase temperature for some time
[C]
stages at which properties do not change with increase in temperature
[D]
there is nothing like points of arrest
Answer: stages at which allotropic forms change
(8)
Isotropic materials are those which have the same
[A]
elastic properties in all directions
[B]
stresses induced in all directions
[C]
thermal properties in all directions
[D]
electric and magnetic properties in all directions
Answer: elastic properties in all directions
(9)
The elastic stress strain behaviour of rubber is
[A]
linear
[B]
non-linear
[C]
plastic
[D]
no fixed relationship
(10)
Stress relaxation is- the phenomenon
[A]
in which parts are not loaded
[B]
in which stress remains constant on in-creasing load
[C]
in which deformation tends to loosen the joint and produces a stress reduced
[D]
stress reduces on increasing load
Answer: in which deformation tends to loosen the joint and produces a stress reduced
(11)
The number of electrons in 1 cm3 of metal would be of the order of
[A]
1010
[B]
TO16
[C]
1022
[D]
1040
(12)
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will
[A]
increase
[B]
decrease
[C]
remain same
[D]
first increase and then decrease
(13)
Slow plastic defomiation of metals under a constant stress is known as
[A]
creep
[B]
endurance
[C]
fatigue
[D]
plastic deformation
(14)
The ultimate tensile strength of low carbon steel by working at a high strain rate will
[A]
decrease
[B]
increase
[C]
remain constant
[D]
first increase and then decrease
(15)
Mild steel belongs to the following category
[A]
low carbon steel
[B]
medium carbon steel
[C]
high carbon steel
[D]
alloy steel
(16)
The ability of a material to resist softening at high temperature is known as
[A]
creep
[B]
hot tempering
[C]
hot hardness
[D]
fatigue
(17)
Malleability 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
Answer: ability to undergo large permanent deformations in compression
(18)
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
Answer: ability to undergo large permanent deformations in tension
(19)
Pure iron is the structure of
[A]
ferrite
[B]
anstenite
[C]
pearlite
[D]
ferrite and cementite
(20)
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is
[A]
770°C
[B]
1050°C
[C]
910°C
[D]
below recrystallisation temperature
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