1. Mechanical stressing of crystal structure --
------ conductivity of metal.
Correct : A. decreases
2. -------- crystallises in the diamond cubic lattice.
Correct : C. diamond
3. --------- deformation is the deformation which disappears when the load is removed.
Correct : A. plastic
4. Atom movements in twinning are much less than ----- --.
Correct : A. atomic spacin g
5. The displacement distance for atoms around the dislocation is the---- --.
Correct : A. burger vector
6. Grain growth is an increase in ----- --.
Correct : B. grain size
7. Slow and progressive deformation of material with timer under constant stress is called----.
Correct : A. creep
8. ------ are elastic members which distort under load and regain their original shape when load is removed.
Correct : B. springs
9. An unit cell is -------
Correct : A. the smallest group of the atoms which when regularly repeated forms the crystal.
10. A material having different properties in different directions is known as:
Correct : B. anisotropic
11. Miller indices are the same for:
Correct : D. parall el plane s
12. On application of thermal energy, a dislocation vanishes:
Correct : D. both a and b
13. Volume imperfections can be:
Correct : D. noncrystalli n e regions
14. The cross-slip occures in:
Correct : B. screw dislocatio n
15. The overall electrical neutralit is maintained in:
Correct : A. frenkel\ s defect
16. Critical resolved shear stress is a phenomenon related to
Correct : C. slip
17. Strain hardening will take place if
Correct : A. obstacle are present
18. The overall electrical nutrality is maintained in
Correct : A. frenkel\ s defect
19. Volume imperfections can be
Correct : D. non crystalline region
20. The omperfections can be minimised by
Correct : D. all of the above
21. Presence of carbon atom in FCC iron at 1100 degrees is an exampl of
Correct : A. interstitial defect
22. Miller indices are same for
Correct : D. parall el plane s
23. A metal which posseses BCC is
Correct : B. sn
24. A material having different properties at different directions is known as
Correct : B. anisotropic
25. The crystal structure of most of the common metals are
Correct : A. cubic
26. In the simple cubic structure,are direction [100] and plane (100) parellel ?
Correct : A. no
27. Structure of thorium is
Correct : B. fcc
28. The capacity of a metal to exhibit cosiderable elastic recovery upon release is known as
Correct : D. resilience
29. The property of the material which enables the formation of permanent deformation without fracture is known as
Correct : B. plasticity
30. ......... working as always accompanied by strain hardening
Correct : B. cold
31. Mechanical streesing of crystal strucure .........conductivity of metals.
Correct : A. decreases
32. The grain boundry area decreases when the polycrystalline material heated ..
Correct : D. above
0.5
tm
33. The critically resolved shear stress Tcr=(P cos α cos β)/A . the equation known as
.....law.
Correct : B. schmid\s
34. The shear stress required to produce slip on crystal plane is called........ shear plane.
Correct : A. critical resolve d
35. .......occures over wide planes
Correct : A. slip
36. In ........every atomic plane is envolved
Correct : C. twinning
37. In metals the plastic deformation is generally takes place by
Correct : B. slip
38. According to bravais ,there are ......... possible types of space lattice in the seven
Correct : B. 14
39. The burger vector is at ..... to the edge dislocation line
Correct : B. perpendicul
a r
40. In .............disloction only shear stress field exists.
Correct : C. screw
41. .................. imperfections involves vacancies of pair of ions of opposite charges
Correct : B. schottky
42. Every point of a space lattice has ....... surrounding.
Correct : D. identical
43. It is possible to continuously work on the metal during ....... working
Correct : A. hot
44. The process of formation of new grains is called......
Correct : B. nucleation
45. The stress required to produce same deformation is higher in case of......... polycrystalline material as compared to
..... ...polycrystalline materials.
Correct : B. fine grained,co ar se grained
46. mechanical testing gives information about
Correct : C. mechanical properties of metal
47. when material is tested to evaluate properties, it is called as
Correct : A. destructive
testing
48. during the product design and its manufacturing process, material undergoes
test
Correct : D. all of the above
49. engineering materials are tested for the purpose of
Correct : D. all of the above
50. tensile test gives values of material properties under the action of forces
Correct : B. tensile
51. total energy absorbed by material in elastic deformation is known as
Correct : A. resilience
52. material obey's hooks law in region
Correct : B. elastic deformation
53. is constant at the yield point
Correct : B. stress
54. the material shows atrain at cnstant stress that point is known as
Correct : A. yield stress
55. the stress-strain diagram becomes non-linear
Correct : A. after yield
point
56. material shows localised deformation after
Correct : B. after uts
57. area under stress-strain curve in elastic region is called as
Correct : A. resilience
58. total area under stress-strain curve is called
as
Correct : A. toughness
59. toughness is defined as total energy absorbed by material in
Correct : C. both of the
above
60. modulus of toughness is
Correct : B. toughness/vo
lume
61. brittle material shows toughness
Correct : A. low
62. ductile material shows toughness
Correct : B. high
63. is the property of a material by which it can be drawin into wires
Correct : A. ductility
64. resistance of a material for its deformation is
called as
Correct : C. stiffness
65. materials like Al shows better
Correct : D. all of the above
66. modulus of resilience is
Correct : C. energy absorbed / volume
67. modulus of resilience is given as
Correct : C. σ2/2e
68. A tensile test specimen has cross
section
Correct : D. all of the above
69. for tensile testing machine is used
Correct : A. universal testing
70. engineering stress is defined as
Correct : C. applied load
/ (original cross section area)
71. true stress is defiend as
Correct : D. instantaneou s load / (original cross section area)
72. for measuring the elongation of specimen on
UTM during tensile test is used
Correct : D. extensomete
r
73. dummy pointer on load - cell is used to
indicate
Correct : C. ultimate load
74. after ultimate stress, stress goes on
Correct : A. reducing
75. all the calculations in tensile test are carried out on a particular distance which is called as
Correct : A. gauge length
76. any sudden change in cross section leads to the formaiton of area
Correct : B. stres concentratio n
77. the graphical representation of results of tensile test is known as
Correct : A. stress strain
curve
78. in engineering stress we consider
Correct : A. original cross
section
79. during the tensile test, the length of specimen and its cross section area
Correct : C. increases, decreases
80. the test which come under the group of destructive tests is
Correct : D. none of the
above
81. the tests which come under the group of destructive tests are
Correct : D. any one of
above
82. the material which does not show the predefined yield stress, the yield stress can be determined by
Correct : B. proof stress method
83. the relation between true stress and engineering stress is
Correct : B. σt=σe(1+e)
84. the relation between true strain and engineering strain is
Correct : D. et=ln(1+e)
85. in tensile stress, necking occurs at a point
where
Correct : D. (dσt/det) =
σt
86. property is not directly shown on
the stress strain curve
Correct : D. all of the above
87. is maximum value of stress upto which stress is directly proportional to strain
Correct : B. proportional
limit
88. is the stress at which material shows a specified amount of plastic deformation
Correct : C. proof stress
89. to calclulate proof stress, method is
used
Correct : A. offset
90. for calculating a proof stress, a parallel line is
drawn at
Correct : B. 0.2% of total elongation
91. is the maximum value of stress in the
plastic region
Correct : A. uts
92. for ducttile material is the maximum value of stress the material can sustain
Correct : A. uts
93. Breaking Stress is also called as
Correct : C. fracture stress
94. is the minimum value of stress in
plastic region
Correct : D. breaking stress
95. unit of toughness is
Correct : B. joule
96. for brittle material its
Correct : C. yield stress and uts and breaking are very close
97. in tensile test, during strain hardening material after cold working shows
in strength with decreased toughness
Correct : B. increase
98. during tensile test, if gauge length percentage elongation increases due to localised elongation
Correct : A. decreases
99. states that geometrically similar samples having constant L/D ratio shows same % elongation
Correct : B. barba\s law
100. during tensile test, type of loading
should be avoided