GATE ME 15. Engineering Materials Science Chapter Engineering Materials Science Test 1 Mock Test Series 2022-23

Question 1
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Which of the following is time-independent?

A
Elastic deformation

B
Anelastic deformation

C
Viscoelastic deformation

D
Creep deformation

Question 2
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The atomic packing factor for a crystal is 0.70. If the side length of unit cell is 1.2° A and the radius of atom is 0.4851° A, then no. of atoms in the unit cell is ______

A
2.50-2.60

B
2.504-2.601

C
2.507-2.606

D
2.509-2.602

Question 3
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Increasing carbon content in steel, _________ ultimate strength and ____ ductility of steel.

A
increases, decreases

B
decreases, decreases

C
increases, increases

D
decreases, increases

Question 4
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In the case of rubber, vulcanization refers to the process of producing a

A
Linear polymer

B
Branched polymer

C
Cross-linked polymer

D
Net-work polymer

Question 5
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If the atomic radius of aluminum is r, what is its unit cell volume?

A
\({\left( {\frac{{2r}}{{\sqrt 2 }}} \right)^2}\)

B
\({\left( {\frac{{4r}}{{\sqrt 2 }}} \right)^3}\)

C
\({\left( {\frac{{2r}}{{\sqrt 3 }}} \right)^3}\)

D
\({\left( {\frac{{4r}}{{\sqrt 3 }}} \right)^3}\)

Question 6
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An eutectoid steel consists of

A

Wholly pearlite

B

Wholly austenite

C

Pearlite and ferrite

D
Pearlite and cementite

Question 7
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Which one of the following materials is not a composite?

A
Wood

B
Concrete

C
Plywood

D
Sialon

Question 8
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At equilibrium, the maximum number of phases that can coexist in a ternary system at constant pressure is ____________.

A
4-4

B
44-41

C
47-46

D
49-42

Question 9
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Alloy steel which is work hardenable and which is used to make the blades ofbulldozers, bucket wheel excavators and other earth moving equipment containiron, carbon and

A
Chromium

B
Silicon

C
Manganese

D
Magnesium

Question 10
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Induction hardening is the process of:

A
Hardening of core

B
Uniform hardening

C
Selective hardening

D
Hardening surface for wear resistance

Question 11
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Number of slip systems in BCC crystal structure is ____?

A
48-48

B
484-481

C
487-486

D
489-482

Question 12
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The eutectic mixture of austenite and cementite in Iron-Carbon system is called

A
Spheroidite

B
Ledeburite

C
Pearlite

D
Bainite

Question 13

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Match the items in column 1 and column 2 and choose the correct combination.

Column 1	Column 2
A - Resilience	1 – Ability of the material to return to the original shape when load is removed
B – Fatigue	2 – Capacity of a material to absorb energy elastically
C – Stiffness	3 – Ability of material to absorb a certain amount of energy without failure
D - Elasticity	4 – Resistance of the material to elastic deformation
	5 – Failure of material at loads less than that at normal conditions

A - 2, B - 5, C - 3, D - 1

A - 3, B - 2, C - 1, D - 4

A - 3, B - 5, C - 4, D - 2

A - 2, B - 5, C - 4, D - 1

Question 14
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Which of the following composites are 'dispersion-strengthened composites’?

A
Particulate composites

B
Laminar composites

C
Fiber reinforced composites

D
Short-fiber discontinuous composites

Question 15
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Match the invariant reactions in Column I with the names in Column II (L is liquid phase, and α, β, γ are solid phases). All reactions proceed to the right on cooling.
Column I
Column II
(P) L ⇄ α + β
(1) Monotectic
(Q) L + α ⇄ β
(2) Peritectoid
(R) γ ⇄ α + β
(3) Peritectic
(S) α + β ⇄ γ
(4) Eutectoid

(5) Eutectic

A
P – 5, Q-1, R-4, S-3

B
P-5, Q-3, R-4, S-2

C
P-5, Q-1, R-2, S-4

D
P-2, Q-1, R-4, S-5

Question 16
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For a metal having atomic weight 49 g/mol, the lattice parameter was found to be 0.30 nm. If the density is 11.90 g/cc, then the crystal structure of metal is

A
BCC

B
SCC

C
FCC

D
Insufficient Data

Question 17
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Directions For Questions

Two plain carbon steel specimens having 0·8% carbon content are welded. If weobserve the weldment under Metallurgical Microscope from centre towards eitherside, the following structures are observed at different zones:

1. Fine Pearlite\

2. Coarse Pearlite

3. Martensite

...view full instructions

Select the correct sequence using the codes given below:

Codes:

A
1, 2, 3

B
1, 3, 2

C
2, 1, 3

D
3, 1, 2

Question 18
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What will be the percentage free space inside the unit cell of a material having atomic radius 0.208 nanometer and BCC structure?

A
30-32

B
304-321

C
307-326

D
309-322

Question 19
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A metal has FCC structure suppose its atomic weight and atomic radius is A and r respectively. Let N denotes Avogadro’s number. What is the density of material?

A
\(\frac{A}{{2\sqrt 2 \;{r^3}N}}\)

B
\(\frac{A}{{4\sqrt 2 \;{r^3}N}}\)

C
\(\frac{A}{{8\sqrt 2 \;{r^3}N}}\)

D
\(\frac{A}{{16\sqrt 2 \;{r^3}N}}\)

Question 20
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Aluminium, which has an atomic radius of 0.143 nm, crystallizes in FCC structure. The lattice parameter of Aluminium is

A
Same as the atomic radius

B
0.404 nm

C
0.333 nm

D
0.576 nm

Question 21
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If the surface of a component is heavily stressed while the stresses in the core areof comparative small magnitude, which one of the following heat treatment methods is employed?

A
Annealing

B
Tempering

C
Quenching

D
Case hardening

Question 22
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Copper has FCC structure and atomic radius is 0.128 nm. The spacing for (111) planes is ______

A
1 A°

B
2 A°

C
3 A°

D
4 A°

Question 23
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Structure of a polymer is:

A
Long chain

B
Rhombic

C
Cubic

D
Closed pack hexagonal

Question 24
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A metallic material has body centered tetragonal unit cell where c = 1.2 a. Then
Hint: If c/a lies between √0.67 and √2, then body diagonal is close packed direction.

A
One unit cell contains two atoms

B
The atomic packing factor of the unit cell is 0.693

C
The relation between a and R (atomic radius) is r = 0.463 a

D
The relation between a and R (atomic radius) is r = 0.433 a

Question 25
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Polyesters can be defined as the condensation products of

A
Dicarboxylic acids with dihydroxy alcohols

B
Bisphenol-A and epichloro-hydrin

C
Phenol and formaldehyde

D
Benzene and toluene

Submit Test

Column I	Column II
(P) L ⇄ α + β	(1) Monotectic
(Q) L + α ⇄ β	(2) Peritectoid
(R) γ ⇄ α + β	(3) Peritectic
(S) α + β ⇄ γ	(4) Eutectoid
	(5) Eutectic

Engineering Mat...

Question 1

Elastic deformation

Anelastic deformation

Viscoelastic deformation

Creep deformation

Question 2

2.50-2.60

2.504-2.601

2.507-2.606

2.509-2.602

Question 3

increases, decreases

decreases, decreases

increases, increases

decreases, increases

Question 4

Linear polymer

Branched polymer

Cross-linked polymer

Net-work polymer

Question 5

\({\left( {\frac{{2r}}{{\sqrt 2 }}} \right)^2}\)

\({\left( {\frac{{4r}}{{\sqrt 2 }}} \right)^3}\)

\({\left( {\frac{{2r}}{{\sqrt 3 }}} \right)^3}\)

\({\left( {\frac{{4r}}{{\sqrt 3 }}} \right)^3}\)

Question 6

Wholly pearlite

Wholly austenite

Pearlite and ferrite

Pearlite and cementite

Question 7

Wood

Concrete

Plywood

Sialon

Question 8

4-4

44-41

47-46

49-42

Question 9

Chromium

Silicon

Manganese

Magnesium

Question 10

Hardening of core

Uniform hardening

Selective hardening

Hardening surface for wear resistance

Question 11

48-48

484-481

487-486

489-482

Question 12

Spheroidite

Ledeburite

Pearlite

Bainite

Question 13

A - 2, B - 5, C - 3, D - 1

A - 3, B - 2, C - 1, D - 4

A - 3, B - 5, C - 4, D - 2

A - 2, B - 5, C - 4, D - 1

Question 14

Particulate composites

Laminar composites

Fiber reinforced composites

Short-fiber discontinuous composites

Question 15

P – 5, Q-1, R-4, S-3

P-5, Q-3, R-4, S-2

P-5, Q-1, R-2, S-4

P-2, Q-1, R-4, S-5

Question 16

BCC

SCC

FCC