Mechanical Engineering Materials (MEM)

ME3I

22343

Steel industry

Multiple Choice Questions (MCQs)

Pages –1/2

1   The product from blast furnace is called
    (A)   Cast iron
    (B)   Pig iron
    (C)   Steel
    (D)   Wrought iron
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
2   Malleability is the property by which a metal or an alloy can be plastically deformed by applying
    (A)   Tensile stress
    (B)   Bending stress
    (C)   Shear stress
    (D)   Compressive stress
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
3   For wire drawing operation, the work material should be
    (A)   Ductile
    (B)   Tough
    (C)   Malleable
    (D)   Resilient
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
4   Ductile iron is another name given to
    (A)   Nodular cast iron
    (B)   Malleable cast iron
    (C)   Grey cast iron
    (D)   White cast iron
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
5   Which is the closest to the purest form of iron?
    (A)   Cast iron
    (B)   Wrought iron
    (C)   Grey iron
    (D)   Mild steel
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
6   In grey cast iron, free graphite is in the form of
    (A)   Flakes
    (B)   Nodules
    (C)   Fine powder
    (D)   Spheroids
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
7   An increase in the percentage of carbon in steel results into decrease in its
    (A)   Hardness
    (B)   Ductility
    (C)   Ultimate strength
    (D)   Corrosion resistance
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
8   Mild steel belongs to the category of
    (A)   No carbon steel
    (B)   Low carbon steel
    (C)   High carbon steel
    (D)   Medium carbon steel
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
9   Eutectic reaction for iron-carbon system occurs at
    (A)   600 deg C
    (B)   723 deg C
    (C)   1147 deg C
    (D)   1493 deg C
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
10   In Iron carbon diagram, the x-axis represents
    (A)   Time
    (B)   Temperature
    (C)   Percentage of carbon
    (D)   Grain size
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
11   An allotropic material has
    (A)   Fixed structure at all temperatures
    (B)   Atoms distributed in random form
    (C)   Different crystal structures at different temperatures
    (D)   Fixed structure but random atom distribution
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
12   Carbon content is highest in
    (A)   Mild steel
    (B)   Eutectic steels
    (C)   Hypo-eutectic steels
    (D)   Hyper-eutectic steels
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
13   Identify the softest material out of the following
    (A)   Austenite
    (B)   Bainite
    (C)   Cementite
    (D)   Ferrite
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
14   Austenite is a solid solution of carbon in
    (A)   Alpha iron
    (B)   Beta iron
    (C)   Gamma iron
    (D)   Delta iron
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
15   Isothermal annealing is mainly used in alloy steels to improve
    (A)   Machinability
    (B)   Toughness
    (C)   Ductility
    (D)   Weldability
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
16   What is the purpose of hardening?
    (A)   Refine the structure
    (B)   Increase toughness
    (C)   Increase cutting ability
    (D)   Relieve stresses and strains
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
17   Which of the following structure has maximum hardness?
    (A)   Martensite
    (B)   Pearlite
    (C)   Sorbite
    (D)   Troostite
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
18   The fastest cooling rate is achieved when steel is quenched in
    (A)   air
    (B)   oil
    (C)   water
    (D)   brine
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
19   In normalizing, components are cooled _____
    (A)   using water
    (B)   using oil
    (C)   in still air
    (D)   in furnace
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
20   Martempering uses _______ quenching.
    (A)   water
    (B)   oil
    (C)   brine
    (D)   interrupted
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
21   In the austempering process of heat treatment, austenite changes into.
    (A)   martensite
    (B)   troostite
    (C)   sorbite
    (D)   bainite
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
22   Maximum surface hardness is attained by
    (A)   Cyaniding
    (B)   Carburizing
    (C)   Flame hardening
    (D)   Nitriding
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
23   In flame hardening the flame used is
    (A)   Oil burner
    (B)   Gas burner
    (C)   Oxy-acetylene
    (D)   Oxygen air
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
24   Induction hardening is the process of
    (A)   Hardening surface of work-piece to obtain hard and wear resistant surface
    (B)   Heating and cooling rapidly
    (C)   Increasing hardness throughout
    (D)   Inducing hardness by continuous process
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
25   What is the carburizing temperature?
    (A)   150-250 deg C
    (B)   400-450 deg C
    (C)   650-700 deg C
    (D)   900-950deg C
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
26   Nitriding of steel is a process for
    (A)   Case hardening
    (B)   Spheroidising
    (C)   Normalizing
    (D)   Annealing
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
27   Steel when it contains more than 10 to 12% chromium becomes
    (A)   Alnico steel
    (B)   High speed steel
    (C)   Stainless steel
    (D)   Heat resistant steel
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
28   Metals possess —— nature
    (A)   Amorphous
    (B)   Crystalline
    (C)   Liquid
    (D)   Highly viscous
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
29   Atomic packing efficiency of BCC lattice is
    (A)   52%
    (B)   74%
    (C)   68%
    (D)   50%
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
30   —— is a building block of the crystal.
    (A)   Crystal
    (B)   Unit cell
    (C)   Multi cell
    (D)   None of the above
[showhide type=”button7c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
31   Which of the following is not a pure metal?
    (A)   Aluminium
    (B)   Copper
    (C)   Brass
    (D)   Silver
[showhide type=”button8c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
32   Which of the following is property of a ceramic material?
    (A)   Brittle
    (B)   Low density
    (C)   Both A and B
    (D)   Ductile
[showhide type=”button8c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
33   Following is the mixture of two or more different materials and they are mechanically or metallurgically bonded together
    (A)   Metals
    (B)   Ceramics
    (C)   Polymers
    (D)   Composites
[showhide type=”button8c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
34   How many numbers of atoms are present in the FCC unit lattice?
    (A)   3
    (B)   4
    (C)   5
    (D)   6
[showhide type=”button8c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
35   Amount of energy absorbed by the material before fracture is called
    (A)   Hardness
    (B)   Toughness
    (C)   Endurance limit
    (D)   Resilience
[showhide type=”button8c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
36   Stress / Strain =
    (A)   Youngs modulus
    (B)   Bulk modulus
    (C)   Modulus of rigidity
    (D)   Shear modulus
[showhide type=”button8c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
37   The property by which the material can be hammered into sheets is
    (A)   Elasticity
    (B)   Plasticity
    (C)   Viscosity
    (D)   Malleability
[showhide type=”button8c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
38   Failure of a machine component under repeated loading is called ——
    (A)   Creep
    (B)   Resilience
    (C)   Fatigue 
    (D)   Toughness
[showhide type=”button8c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
39   Which of the following is brittle material?
    (A)   Steel
    (B)   Copper
    (C)   Aluminium
    (D)   Cast iron
[showhide type=”button8c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
40   Creep is ——
    (A)   Time dependent
    (B)   Time independent
    (C)   Pressure dependent
    (D)   Temperature dependent
[showhide type=”button8c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
41   Which indenter is used for Brinell’s hardness test?
    (A)   Hardened steel ball
    (B)   Diamond ball
    (C)   Diamond prism
    (D)   Steel prism
[showhide type=”button8c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
42   In alloy a metal which is present in the largest proportion is called as
    (A)   Main metal
    (B)   Base metal
    (C)   Pure metal
    (D)   All of the above
[showhide type=”button8c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
43    A material is defined as
    (A)   Anything that occupies space and has mass
    (B)   Anything that has volume
    (C)   Both a and b
    (D)   None of this
[showhide type=”button8c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
44   Which of the following is not a ferrous alloy?
    (A)   Mild steel
    (B)   Alloy steel
    (C)   Cast iron
    (D)   Bronze
[showhide type=”button8c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
45   The property to undergo deformation under tension without fracture is known as —–
    (A)   Malleability
    (B)   Ductility
    (C)   Luster
    (D)   Toughness
[showhide type=”button8c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
46   The ability of metal to reflect light is known as —–
    (A)   Luster
    (B)   Ductility
    (C)   Malleability
    (D)   Toughness
[showhide type=”button8c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
47   Atomic packing efficiency of HCP is
    (A)   0.74
    (B)   0.68
    (C)   0.52
    (D)   0.48
[showhide type=”button8c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
48   Ability of material to withstand scratching is known as —–
    (A)   Creep
    (B)   Hardness
    (C)   Brittleness
    (D)   Toughness
[showhide type=”button8c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
49   Brass is 
    (A)   Solid solution
    (B)   Liquid solution
    (C)   Gas solution
    (D)   All of these
[showhide type=”button8c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
50   Carbon content is highest in 
    (A)   Mild steel 
    (B)   Eutectic steels
    (C)   Hypo-eutectic steels
    (D)   Hyper-eutectic steels
[showhide type=”button8c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
51   Identify the softest material out of the following
    (A)   Bainite
    (B)   Cementite
    (C)   Ferrite
    (D)   Pearlite
[showhide type=”button8c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
52   The unit cells
    (A)   Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
    (B)   Have the same orientation and their similar faces are parallel
    (C)   May be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice
    (D)   All of the above
[showhide type=”button8c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
53   Which of the following is not an amorphous material?
    (A)   Glass
    (B)   Plastics
    (C)   Lead
    (D)   polymers
[showhide type=”button8c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
54   Amorphous solids have _______ structure
    (A)   Regular
    (B)   Linear
    (C)   Irregular
    (D)   Dendritic
[showhide type=”button8c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
55   The material in which the atoms are arranged chaotically, is called
    (A)   amorphous material
    (B)   mesomorphous material
    (C)   crystalline material
    (D)   none of these
[showhide type=”button8c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
56   There are fourteen atoms in a unit cell of
    (A)   BCC
    (B)   FCC
    (C)   HCP
    (D)   none of these
[showhide type=”button8c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
57   The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
    (A)   coordination number
    (B)   atomic packing factor
    (C)   space lattice
    (D)   none of these
[showhide type=”button8c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
58   According to Hume Rothery’s rules, size of atoms must not differ by more than ________
    (A)   5%
    (B)   15%
    (C)   35%
    (D)   55%
[showhide type=”button8c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
59   Body centred cubic space lattice is found in
    (A)   zinc, magnesium, cobalt, cadmium, antimony and bismuth
    (B)   gamma-iron, aluminium, copper, lead, silver and nickel
    (C)   alpha-iron, tungsten, chromium and molybdenum
    (D)   none of the above
[showhide type=”button8c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
60   The atomic packing factor in a simple cubic unit cell is _______
    (A)   0.74
    (B)   0.52
    (C)   0.68
    (D)   0.66
[showhide type=”button8c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
61   What is the coordination number of a simple cubic (SC) unit cell?
    (A)   4
    (B)   6
    (C)   8
    (D)   2
[showhide type=”button9c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
62   Closed packed hexagonal space lattice is found in
    (A)   zinc, magnesium, cobalt, cadmium, antimony and bismuth
    (B)   gamma-iron, aluminium, copper, lead, silver and nickel
    (C)   alpha-iron, tungsten, chromium and molybdenum
    (D)   none of the above
[showhide type=”button9c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
63   The molecules in a solid move
    (A)   In a random manner
    (B)   In a haphazard way
    (C)   In circular motion
    (D)   Back and forth like tiny pendulums
[showhide type=”button9c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
64   Which one of the following is most symmetrical?
    (A)   Simple cubic cell
    (B)   Hexagonal
    (C)   Triclinic
    (D)   Tetragonal
[showhide type=”button9c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
65   The type of space lattice found in gamma-iron is
    (A)   face centred cubic space lattice
    (B)   body centred cubic space lattice
    (C)   close packed hexagonal space lattice
    (D)   none of these
[showhide type=”button9c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
66   Which of the following iron exist between 910° C and 1403° C?
    (A)   α-iron
    (B)   β-iron
    (C)   γ-iron
    (D)   δ-iron
[showhide type=”button9c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
67   The type of space lattice found in alpha-iron is
    (A)   face centred cubic space lattice
    (B)   body centred cubic space lattice
    (C)   close packed hexagonal space lattice
    (D)   none of these
[showhide type=”button9c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
68   At ________ iron changes its BCC structure to FCC.
    (A)   308°C
    (B)   568°C
    (C)   771°C
    (D)   906°C
[showhide type=”button9c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D  [/showhide]
69   The coordination number of a face centred cubic space lattice is
    (A)   six
    (B)   twelve
    (C)   eighteen
    (D)   twenty
[showhide type=”button9c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
70   Specify the sequence correctly
    (A)   Grain growth, recrystallisation, stress relief
    (B)   Stress relief, grain growth, recrystallisation
    (C)   Stress relief, recrystallisation, grain growth
    (D)   Grain growth, stress relief, recrystallisation
[showhide type=”button9c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
71   Which of the following has a HCP crystal structure?
    (A)   W
    (B)   Mo
    (C)   Cr
    (D)   Zr
[showhide type=”button9c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
72   Lead is a metallic crystal having a _______ structure.
    (A)   FCC
    (B)   BCC
    (C)   HCP
    (D)   TCP
[showhide type=”button9c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
73   The metallic structure of mild steel is
    (A)   Body centered cubic
    (B)   Face centered cubic
    (C)   Hexagonal close packed
    (D)   Cubic structure
[showhide type=”button9c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
74   What is the coordination number of a simple cubic structure?
    (A)   6
    (B)   8
    (C)   10
    (D)   12
[showhide type=”button9c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
75   Coordination number for an ideal BCC metallic crystal is
    (A)   8
    (B)   6
    (C)   12
    (D)   Varies for different metal
[showhide type=”button9c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
76   What is the coordination number of a FCC structure?
    (A)   6
    (B)   8
    (C)   10
    (D)   12
[showhide type=”button9c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
77   The axial relationship of a monoclinic crystal system is given as ___________
    (A)   a = b = c
    (B)   a = b ≠ c
    (C)   a ≠ b = c
    (D)   a ≠ b ≠ c
[showhide type=”button9c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
78   The axial relationship of a rhombohedral crystal system is given as ___________
    (A)   a = b = c
    (B)   a = b ≠ c
    (C)   a ≠ b = c
    (D)   a ≠ b ≠ c
[showhide type=”button9c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
79   The interracial angles of a hexagonal crystal system are given by __________
    (A)   α = β = ϒ = 90  ̊
    (B)   α = β = 90  ̊  ϒ = 120  ̊
    (C)   α = β = ϒ ≠ 90  ̊
    (D)   α ≠ β ≠ ϒ ≠ 90  ̊
[showhide type=”button9c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
80   The interracial angles of a triclinic crystal system are given by __________
    (A)   α = β = ϒ = 90  ̊
    (B)   α = β = 90  ̊  ϒ = 120  ̊
    (C)   α = β = ϒ ≠ 90  ̊
    (D)   α ≠ β ≠ ϒ ≠ 90  ̊
[showhide type=”button9c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
81   Which of the following axis system is being satisfied by cubic crystal system?
    (A)   a = b = c, α = β = γ = 90  ̊ 
    (B)   a ≠ b = c, α = β = γ = 90  ̊ 
    (C)   a = b ≠ c, α = β = γ =90  ̊ 
    (D)   a = b = c, α ≠ β = ϒ =90  ̊ 
[showhide type=”button9c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
82   What is the atomic packing factor of simple cubic structure?
    (A)   0.52
    (B)   0.68
    (C)   0.74
    (D)   0.96
[showhide type=”button9c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
83   What is the atomic packing factor of FCC structure?
    (A)   0.52
    (B)   0.68
    (C)   0.74
    (D)   0.96
[showhide type=”button9c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
84   What is the atomic packing factor of BCC structure?
    (A)   0.54
    (B)   0.68
    (C)   0.74
    (D)   0.96
[showhide type=”button9c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
85   Substitution of a foreign atom in the site of parent atom in the crystal is a?
    (A)   Vacancy defect
    (B)   Substitution impurity
    (C)   Volume imperfection
    (D)   Line imperfections
[showhide type=”button9c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
86   Edge dislocation imperfection is a sub type of _____________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
[showhide type=”button9c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
87   Vacancy defects in solids is a sub type of __________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
[showhide type=”button9c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
88   Twin or Twinning is a category of ________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
[showhide type=”button9c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
89   As the grain size of a metal increases, its strength ________
    (A)   Decreases
    (B)   Increases
    (C)   Remains constant
    (D)   No effect of grain size on strength
[showhide type=”button9c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
90   Phenomenon of cross slip occurs in ________
    (A)   Point imperfections
    (B)   Line imperfections
    (C)   Volume imperfections
    (D)   Surface imperfections
[showhide type=”button9c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
91   The imperfection in the crystal structure of metal is called
    (A)   Dislocation
    (B)   Slip
    (C)   Fracture
    (D)   Impurity
[showhide type=”button10c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
92   The bond formed by transferring electrons from one atom to another is called
    (A)   ionic bond
    (B)   covalent bond
    (C)   metallic bond
    (D)   none of these
[showhide type=”button10c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
93   The defect which takes place due to imperfect packing of atoms during crystallisation is known as
    (A)   line defect
    (B)   surface defect
    (C)   point defect
    (D)   none of these
[showhide type=”button10c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
94   Up till which point will a body regain its original shape?
    (A)   Yield point
    (B)   Elastic limit
    (C)   Fracture limit
    (D)   Ultimate tensile strength point
[showhide type=”button10c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
95   Plasticity increases with temperature.
    (A)   TRUE
    (B)   FALSE
[showhide type=”button10c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
96   Which of the following is not an evidence of plastic action on the material?
    (A)   Yield
    (B)   Plastic flow
    (C)   Fatigue
    (D)   Creep
[showhide type=”button10c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
97   Which of the following is the property because of which a material can be drawn into wires?
    (A)   Ductility
    (B)   Elasticity
    (C)   Malleability
    (D)   Strength
[showhide type=”button10c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
98   What is the unit of impact strength?
    (A)   N/m
    (B)   MN/m
    (C)   MN/m2
    (D)   N/m2
[showhide type=”button10c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
99   Arrange the following in increasing order of hardness: talc, gypsum, topaz diamond.
    (A)   Talc, gypsum, topaz, diamond
    (B)   Gypsum, topaz, talc, diamond
    (C)   Diamond, topaz, talc, gypsum
    (D)   Topaz, gypsum, talc, diamond
[showhide type=”button10c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
100   How is brittleness related to impact strength?
    (A)   Brittleness is directly proportional to impact strength
    (B)   Brittleness is inversely proportional to impact strength
    (C)   Brittleness is directly proportional to a square of impact strength
    (D)   Brittleness is inversely proportional to a square of impact strength
[showhide type=”button10c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]

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