Engineering Materials Quiz | Engineering Materials Multiple Choice Questions(MCQs) & Answers

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Questions
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
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3 Which of the following constituents of steels is softest and least strong
A austenite
B pearlite
C ferrite
D cementlte

Answer: ferrite
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

Answer: below 10°K
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

Answer: non-linear
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

Answer: 1022
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

Answer: increase
13 Slow plastic defomiation of metals under a constant stress is known as
A creep
B endurance
C fatigue
D plastic deformation

Answer: creep
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

Answer: increase
15 Mild steel belongs to the following category
A low carbon steel
B medium carbon steel
C high carbon steel
D alloy steel

Answer: low carbon 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

Answer: hot hardness
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

Answer: ferrite
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

Answer: 770°C

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