Correct : D. The region where Hooke's law does not hold good
4. The process of shaping thin metals by pressing it against form while it is rotating is known as
Correct : D. Metal spinning
5. Stress concentration occurs when
Correct : C. A body is subjected to non-uniform stress distribution
6. Brinell hardness number of mild steel should expected to be in the range be
Correct : B. 110-150
7. DIN standards are used in
Correct : E. Germany
8. The process of reheating hardened steel to temperature below the lower critical temperature followed by any desired rate of cooling, is known as
Correct : D. Tempering
9. Gamma iron exists at temperatures in the range
Correct : E. Between 900?C and 1400?C
10. Hardness of martensite is about
Correct : B. RC 65
11. Nitriding is a process for
Correct : C. Case hardening
12. Polyethylene is produced by
Correct : B. Addition polymerization
13. Which of the following rays are neither deflected by electric field nor by magnetic field?
Correct : C. ?-rays
14. In drop forging the forging is done by
Correct : C. Dropping the die with hammer at high velocity
15. The process of austempering results in the formation of
Correct : D. Bainite structure
16. Which of the following materials can be used for temperatures upto 500?C?
Correct : C. Mica
17. The resistivity of electrical conductors is most affected by
Correct : C. Composition
18. The process of adding impurity to a semi-conductor material is called
Correct : C. Doping
19. Which of the following material can be used at temperatures above 100?C?
Correct : B. Teflon
20. Which of the following method cannot be used for thermoplastic materials?
Correct : B. Blow moulding
21. Identify the correct statement
Correct : C. A metal which is ductile in tension at room temperature can become brittle in the presence of notches
22. The process of heating iron base alloys to approzimately 40?C above the critical temperature range followed by cooling to below that range in still air at ordinary temperature is known as
Correct : A. Normalizing
23. Bainiti is a fine maxture of
Correct : A. ferrite and cementite
24. In inverse rate curve
Correct : A. The ordainate is temperature
25. In Brinell hardness tests if a soft ball is used for indentation
Correct : D. The ball may deform
26. High purity copper is obtained by
Correct : D. electric refining
27. A solution of NaOH conducts electricity bcause NaOH is
Correct : C. A strong electrolyte
28. The process by which a steel ingot is converted into a sheet is known as
Correct : A. Rolling process
29. Eutectic is
Correct : A. a phase transformation in which all the liquid phase transforms on cooling to two solid phases simultaneously
30. One of the objects of annealing is
Correct : D. All above
31. Silicon steel used for electrical purposes has silicon percentage of
Correct : A. 3.40%
32. Which of the following method can be used for thermoplastic materials?
Correct : C. Calendering
33. Which of the following polymer is crystalline?
Correct : D. Polyethylene
34. Which of the following alloy does not contain tin?
Correct : D. White metal
35. The behavious of visco-elastic material is
Correct : D. Elastic
36. When the temperature of a semi-conductor is reduced to absolute zero
Correct : C. all valence electrons remain in the valence bond
37. Which of the following pipe will corrode easily?
Correct : C. ERW pipe
38. Identify the correct relation
Correct : A. Mass number - Atomic number = Number of neutrons
39. In which of the following case creep is an important consideration?
Correct : C. Blades of a steam turbine
40. Malleal lity of a material is defined as
Correct : C. Ability to undergo large permanent deformation in compression
41. The percentage of carbon in low carbon steel is
Correct : A. 0.15
42. Which process is used for joining parts or materials?
Correct : E. Sintering
43. In case of eutectoid steels which one of the following structures has the maximum hardness?
Correct : E. Martensite
44. Ductility of material may be defined as
Correct : C. Ability to undergo large permanent deformations in tension
45. The Miller indices of the diagonal plane of a cube are
Correct : D. 110
46. The primary purpose of annealing is to
Correct : B. Soften the steel for machining after cold working
47. Isotropic materials have
Correct : A. Same elastic properties in all directions
48. Most of the energy expended in deforming a metal by cold working is
Correct : C. Converted into heat
49. The properties of cast iron are regulated by
Correct : E. Control of amount, type, size and distribution of various carbon formations
50. Polysterene is
Correct : B. A hydrocarbon
51. Steel cannot be hardened unless it is heated
Correct : C. Above the lowest critical point
52. Case hardening
Correct : A. Is done to get a soft ductile interior with a very hard surface
53. High ratio of surface to mass tend to
Correct : E. Produce greater depth of hardening
54. The machine used for determining tensile strength of steel is
Correct : D. Universal testing machine
55. Toughness of a material means
Correct : D. Strength
56. Blast furnace gas is
Correct : B. A by-product of blast furnace
57. Materials in order of reducing electrical conductivity are
Correct : D. Silver, Copper, Gold, Aluminium
58. The critical points for steels
Correct : B. Cause change in physical properties
59. Grey iron
Correct : A. Has low ductility
60. Crystal structure of a material is generally examined by
Correct : D. X-rays and electron diffraction
61. Which is the heaviest?
Correct : E. Atom
62. If a solid cube is subjected to equal tensile stresses on all its faces the volumetric strain is n times the linear strain, where
Correct : E. n = 9
63. The process of pulling a rod through series of decreasing diameters is known as
Correct : A. Wire drawing
64. Line imperfection in a crystal is called
Correct : C. Edge dislocation
65. The process of polymerisation is associated with
Correct : A. Thermo-plastic
66. Selenium is
Correct : A. Intrinsic semi-conductor
67. Which of the following is not a semi-conductor?
Correct : B. Tetraethyl lead
68. The main constituent of dynamite is
Correct : C. Nitroglycerine
69. To chck the performance of a substance in deep drawing, the test usually conducted is
Correct : C. Cupping test
70. Which of the following is the characteristic of ceramic materials?
Correct : B. Hardness and brittleness
71. Sheradising process is used for
Correct : E. Surface coating
72. Nichrome are alloys of
Correct : C. Nickel, chromium and silver
73. Identify the incorrect statement
Correct : D. None of the above
74. The modulus of elasticity E, the bulk modulus of elasticity K and the Poisson's ratio are related by the relation
Correct : C. E = 3K (1 - 2
75. Phenol and formaldehyde are polymerised to a resultant product known as
Correct : B. Bakelite
76. In pack-carburising carbon is supplied
Correct : A. In the form of charcoal
77. Identify the incorrect statement, if any
Correct : A. Dislocations in real crystals are generally straight lines which are generally in same plane
78. Brinell hardness number for soft brass is usually in the range
Correct : B. 50-70
79. Compressve strength of wood is usually
Correct : C. More along the grains
80. Fatigue cracks in metals normally start at
Correct : B. Surface of the specimen
81. Steel with 0.8% carbon and 100% pearlite is called
Correct : A. Eutectoid
82. Spot the process which is different from others?
Correct : C. Cold heading
83. Dislocations in materials are
Correct : E. Line defects
84. When a ferromagnetic substance is magnetised, small changes in dimensions occur. Such a phenomenon is known as
Correct : C. magneto striction
85. Age hardening is related with
Correct : A. Stainless steel
86. Cast iron contains
Correct : D. 2 to 4% carbon
87. Neoprene is
Correct : C. Rubber like plastic
88. The intensity of magnetisation M of a ferromagnetic solid
Correct : C. decreases with increasing temperature
89. Which of the following aluminium alloy is commonly used for utensils?
Correct : B. Hindalium
90. Which of the following is incorrect for diamond?
Correct : B. Densest form of carbon
91. The elastic limit of cast iron is
Correct : A. Close to ultimate breaking strength
92. Bush bearings is
Correct : D. White metal alloy
93. Silicon doped with gallium is
Correct : C. p-type semi-conductor
94. The permeability of soft iron can be increased by
Correct : C. alloying with cobalt
95. The fatigue strength of materials increases
Correct : E. By under stressing the specimen
96. Thermosetting polymers are
Correct : C. Cast moulded
97. Dies for drawing are generally made of
Correct : E. None of the above
98. Which of the following is the hardest material?
Correct : D. Diamond
99. Which of the following is the ferroelectric material?
Correct : C. Potassium dehydrogen phosphate
100. The crystal structure of a material can be studied by