1. The ability of material to absorb a large amount of energy is
Correct : C. Toughness
2. Porous materials generally
Correct : C. Absorb most of the sound
3. A body which does not contain voids or empty spaces is known as
Correct : A. Continuous body
4. Standards used in USSR are known as
Correct : C. GOST
5. A non-crystalline polymer which can be stretched to more than twice its original length and which contracts quickly on releasing the load, is known as
Correct : D. elastomer
6. For better fuuidity of the molten metal, the following is added in blast furnace
Correct : D. Manganese
7. Lead is used for joining pipes made of
Correct : A. Cast iron
8. Laser is a device to produce
Correct : C. Coherent light
9. Which of the following has the highest malleability?
Correct : E. Lead
10. Notches in a section produce
Correct : D. Tri-axial tensile stresses
11. In induction hardening
Correct : D. The frequency is high
12. Burger's vector is
Correct : C. a property of dislocations
13. German silver is an alloy of
Correct : C. Nickel, copper and zinc
14. The atomic number of a certain element is 83. An atom of this element must contain
Correct : D. 83 electrons
15. The electrical resistance of a semi-conductor
Correct : B. Decreases with temperature
16. Coolant is used on a lathe
Correct : D. All the above
17. Which one is different from the other in press work?
Correct : D. Seaming
18. Hard steels and non-ferrous metal do not exhibit a definite yield point when pulled in the testing machine and for such cases a better measure of their elastic properties is defined by
Correct : C. Proof stress
19. If the major quantium number of an atom is three, it possesses
Correct : C. Only s, p and d electrons
20. In an one component system containing two phases, at equilibrium the number of degrees of freedom would be
Correct : D. 1
21. The furnace used for castings of cast iron in a foundry shop is known as
Correct : D. Cupola
22. In fibre glass reinforced plastics, the glass fibres are primarily used to improve
Correct : A. Mechanical properties of plastics
23. Application of tin is in
Correct : B. low current fuses
24. The phenomenon of 'weld decay' is associated with
Correct : A. Stainless steels
25. German silver contains
Correct : A. 5% silver
26. Which of the following is a composite material?
Correct : D. Fibre reinforced plastic
27. A material which undergoes no deformation till its yield point is reached and then it flows at a constant stress is known as
Correct : A. Rigid plastic
28. In carbon steel castings
Correct : A. The percentage of carbon is less than 1.7%
29. Nickel is used in
Correct : C. electrodes of thermionic valves
30. In order to improve machinability of steels, the treatment generally done is
Correct : D. Annealing
31. Induction hardening is the process of
Correct : B. Hardening surface for wear resistance
32. "Troosite" is obtained when
Correct : A. Quenching steel during transformation
33. The semi-conductors have electrical conductivities of the following order (ohm-cm-1)
Correct : C. 10?3
34. Cast iron containing 6.6% carbon is
Correct : D. Whitish containing cementite only
35. The main alloy for corrosion resistance in stainless steel is
Correct : E. Chromium
36. A steel having ferrite and pearite is
Correct : A. Soft
37. Which variety of copper has the best mechanical strength?
Correct : B. Hard drawn copper
38. Brinell hardness number for nitrided steel is in the range
Correct : D. 700 to 800
39. Diamagnetic materials are
Correct : B. Strongly magnetised
40. Gamma iron has
Correct : D. Face centred space lattice structure with 14 atoms
41. Silicon steel is widely used in
Correct : C. Electrical industry
42. Moh's scale of hardness has the range
Correct : D. 1--10
43. The tendency for brittle fracture increases with
Correct : E. None of the above
44. Preheating of material to be welded is necessary in case of
Correct : B. Cast iron
45. Steel balls for ball bearings are generally made of
Correct : A. Carbon chrome steel
46. The process of reheating the hardened steel to some temperature below the critical range, followed by any rate of cooling is known as
Correct : C. Tempering
47. Delta iron occurs at temperature in the range of
Correct : D. Between 1400?C and 1530?C
48. Which process is used primarily to obtain surface finish
Correct : E. Parkerizing
49. In normalising steel is heated 40-50 C
Correct : A. Above the upper transformation range
50. Which of the following metals has high tendency to get work hardened?
Correct : C. Brass
51. The property of materials by which they can be drawn into wires is known as
Correct : E. Ductility
52. The strength of timber is
Correct : B. more along the grains less across the grains
53. Permalloy is
Correct : C. A non-ferrous alloy containing nickel copper and chromium
54. Visco-elastic behaviour is common in
Correct : A. Crystalline materials
55. The hardness of steel depends on
Correct : B. The shape and distribution of carbides in iron
56. When a current is passed through the junction of two different metals, heat is absorbed or liberated depending on the direction of the current. The above phenomenon is known as
Correct : C. Peltier's effect
57. Hastalloy consists of
Correct : B. Nickel and molybdenum
58. Which of the following hardness tester can be used to determine the hardness of a glass sheet?
Correct : D. Shore scleroscope
59. A material is known as allotropic or polymoriphic if it
Correct : C. Has a fixed structure under all conditions
60. A piezo electric is
Correct : A. a material which become polarised when stressed
61. A material with unequal anti-parallel atomic magnetic moments is
Correct : A. an anti-ferromagnetic
62. Boring is generally
Correct : D. Preceded by drilling
63. Ferromagnetic alpha iron change to paramagnetic alpha iron at
Correct : C. 77?C
64. If a body has identical properties all over it is known as
Correct : E. Homogeneous
65. The technique of converting metallic powders into articles of definite form is known as
Correct : C. Powder metallurgy
66. In Brinell hardness testing, while determining hardness of aluminium
Correct : C. Load on the indenter is reduced
67. In flame hardening the flame used is
Correct : E. Oxy-acetylene
68. Viscoelastic materials show behaviour which is
Correct : E. Time dependent
69. Age hardening is generally applicable to
Correct : A. Alloys of aluminium, magnesium, nickel etc
70. Inconel is an alloy containing
Correct : A. Nickel, zinc and iron
71. Just as strong is opposite to weak, similarly brittle is opposite to
Correct : A. Tough
72. Gel is
Correct : C. A solid frme work of colloidal particles linked together and containing a fluid in its interstices
73. Aluminium alloys for pressure die casting
Correct : A. Must possess considerable fluidity
74. Carburizing is done
Correct : B. On steels with carbon percentage of 0.5%
75. The amount of cold work that a metal will stand is dependent upon
Correct : C. Ductility
76. Solder is an alloy consisting of
Correct : C. Tin and lead
77. Which of the following material can be used for the filaments in incandescent lamps?
Correct : B. Tungsten
78. As per ISS : designation T 70 W 18 4V 1 is
Correct : C. High speed steel
79. Which of the following is not the characteristic property of aluminium?
Correct : C. Lest affinity for oxygen
80. In 18-4-1 high speed steel the maximum percentage of any constituent is
Correct : A. Iron
81. Wrought iron is
Correct : D. Highly resistant to corrosion
82. Machining properties of brass can be improved by the addition of
Correct : B. Lead
83. Silicon steel is widely used in
Correct : B. Electrical industry
84. The process by which steel is coated by a thin layer of phosphate is known as
Correct : D. Parkerising
85. Creep is expressed in terms of
Correct : D. cm/cm/hr
86. According to Hooke's law
Correct : D. Within elastic limits average stress is proportional to average strain
87. Which one is different from the others in press work operations?
Correct : E. Punching
88. The advantage of electroforming is
Correct : D. (A) and (B) above
89. The size of coarse grams in metals is
Correct : C. > 0.05 mm
90. A ductile fracture is characterized by
Correct : D. Appreciable plastic deformation prior to propagation of crack
91. Which of the following is not a rare and precious metal?
Correct : D. Lithium
92. Which of the following is donor impurity for semi-conductors?
Correct : C. Antimony
93. A concrete wall generally
Correct : D. Reflects sound
94. The effect f rolling on steel is
Correct : A. To elongate the inclusions in the direction of rolling giving the steel excellent properties
95. Fatigue failure occurs when a part is subjected to
Correct : D. Fluctuating stress
96. Heavy water is used in atomic power plants as
Correct : B. Moderator
97. The surface hardness that can be obtained by nitriding is generally in the range
Correct : D. 1000 to 1100 VPN
98. Residual magnetism is
Correct : C. Flux density present in a material after magnetising force is removed
99. Every material obeys the Hooke's law within
Correct : B. Elastic limit
100. In cast irons
Correct : C. With static loading the strength in tension is lower than that in compression