1. For an aluminium the modulus of rigidity is 2.1×1010 N/m2 and density is 2.7×103 kg/m3. Find the speed of transverse waves in the medium.
Correct : B. 2.79×103 m/s
2. Sound travels through a gas under which of the following condition?
Correct : C. adiabatic condition
3. What kind of wave is formed in organ pipes?
Correct : D. longitudinal stationary waves
4. A wave transmits momentum. Can’t it transfer angular momentum?
Correct : B. no
5. What is the most fundamental property of wave?
Correct : C. frequency
6. Which of the following is also known as pressure waves?
Correct : B. longitudinal waves
7. In which medium sound travels faster?
Correct : A. solid
8. TEM and SEM are the same microscopy techniques.
Correct : A. true
9. The resolving power of TEM is derived from
Correct : A. electrons
10. The cathode of transmission electron microscope consists of a
Correct : A. tungsten wire
11. The resolution attainable with standard TEM is less than the theoretical value.
Correct : A. true
12. During TEM, a vacuum is created inside the
Correct : C. column
13. Which of the following component of TEM focuses the beam of electrons on the sample?
Correct : B. condenser lens
14. Image formation in electron microscope is based on
Correct : C. differential scattering
15. The biological materials have little intrinsic capability to
Correct : A. scatter electrons
16. Glutaraldehyde is a
Correct : B. fixative
17. Osmium is a
Correct : B. heavy metal
18. Shadow casting is a technique of visualizing
Correct : A. isolated particles
19. Which of the following can be a wave function?
Correct : B. sin x
20. Which of the following is not a characteristic of wave function?
Correct : D. physically significant
21. dΨ/dx must be zero.
Correct : B. false
22. Any wave function can be written as a linear combination of
Correct : C. eigen functions
23. The Schrödinger is a differential equation.
Correct : B. false
24. The walls of a particle in a box are supposed to be
Correct : D. infinitely hard and infinitely large
25. The wave function of the particle lies in which region?
Correct : C. 0 < x < l
26. The particle loses energy when it collides with the wall.
Correct : B. false
27. The Energy of the particle is proportional to
Correct : C. n2
28. For a particle inside a box, the potential is maximum at x =
Correct : A. l
29. The Eigen value of a particle in a box is
Correct : D. √2/l
30. Particle in a box can never be at rest.
Correct : A. true
31. The wave function for which quantum state is shown in the figure?
Correct : B. 2
32. The line at which the tunnel wall breaks from sloping outward can be given as
Correct : A. spring line
33. Which of the following should be considered while aligning a tunnel?
Correct : B. hydrological conditions
34. Among the following, which doesn’t belong to tunnel classification?
Correct : C. rocky ground
35. Which method can be adopted if full face excavation is not possible?
Correct : D. benching
36. Among the following, which can be adopted for providing support for soft strata?
Correct : C. bents of steel
37. A steel cylinder which is pushed in the soft soil is determined as
Correct : B. shield
38. Which method can be adopted in case of rock tunneling?
Correct : A. full face method
39. Which of the following can act as an alternative for blasting?
Correct : D. fire-setting
40. Which of the following involves in the sequence of rocky strata?
Correct : A. marking profile
41. Which of the following are true for electron microscopy?
Correct : D. specimen should be thin and dry, image is obtained on a phosphorescent screen and electron beam must pass through evacuated chamber
42. Negative Staining is used for examining
Correct : D. virus particles, protein molecules and bacterial flagella
43. Which among the following helps us in getting a three-dimensional picture of the specimen?
Correct : B. scanning electron microscope
44. The secondary electrons radiated back in scanning microscope is collected by?
Correct : B. anode
45. On what factors do the intensity of secondary electrons depend upon?
Correct : D. size and chemical composition of the irradiated object, number of electrons ejected and on the number of electrons reabsorbed by surrounding
46. Where do we obtain the magnified image of the specimen in SEM?
Correct : A. cathode ray tube
47. Which of the following techniques are used in Transmission Electron Microscopy (TEM) for examining cellular structure?
Correct : D. negative-staining, shadow casting, ultrathin sectioning, freeze-etching
48. Which of the following properties is generally exhibited by amorphous solids?
Correct : B. glass-transition
49. Metal glass was first prepared at:
Correct : A. california institute of technology
50. Polycrystalline solids are isotropic.
Correct : A. true
51. Metal glasses differ from their crystalline counterparts in many ways. Chief application(s) of metal glasses include(s):
Correct : B. power transformers
52. Soda-lime glass is the most common type of glass. The component present in largest w/w percentage is:
Correct : A. sio2
53. Lead-oxide glass is called “crystal glass” because:
Correct : D. none of the mentioned
54. Crystallinity increases with increasing rate of cooling of a liquid.
Correct : B. false
55. 2 SINGLE CRYSTALS: UNIT CELL, CRYSTAL SYSTEMS, BRAVAIS LATTICES, DIRECTIONS AND PLANES IN A CRYSTAL, MILLER INDICES
Correct : A. unit cell edge lengths
56. In cubic crystals, crystallographic directions are arranged in families. Which of the following directions does not belong to the family <110>?
Correct : D. none of the mentioned view answer
57. Which of the following is a property of Miller indices?
Correct : C. they are not fractions
58. Miller indices for perpendicular planes are always the same.
Correct : B. false view answer
59. For destructive interference to take place, the path difference between the two waves should be:
Correct : A. nλ
60. Bragg’s law is not a sufficient condition for diffraction by crystalline solids.
Correct : A. true
61. The Miller indices h, k, and l of parallel planes in a BCC lattice should satisfy which of the following X-ray diffraction reflection rules?
Correct : A. h + k + l should be even
62. Laue’s model pictures XRD as reflection from parallel crystalline planes. Reflection is different from refraction as:
Correct : D. all of the mentioned view answer
63. K-alpha x-rays have shorter wavelengths than K-beta x-rays?
Correct : B. false view answer
64. Which of the following has a HCP crystal structure?
Correct : D. zr
65. Amorphous solids have structure.
Correct : C. irregular
66. At iron changes its BCC structure to FCC.
Correct : D. 906oc
67. At room temperature, tin is formed into
Correct : B. white tin
68. Which of the following is a property of non-metallic crystals?
Correct : C. low electrical conductivity
69. Which of the following is not an amorphous material?
Correct : C. lead
70. The smallest portion of the lattice is known as
Correct : D. unit cell
71. A unit cell that contains lattice points only at the corners is known as
Correct : A. primitive unit cell
72. The axial relationship of a monoclinic crystal system is given as
Correct : D. a ≠ b ≠ c
73. The axial relationship of a rhombohedral crystal system is given as
Correct : A. a = b = c
74. The interracial angles of a hexagonal crystal system are given by
Correct : B. α = β = 90o ϒ = 120o
75. The interracial angles of a triclinic crystal system are given by
Correct : D. α ≠ β ≠ ϒ ≠ 90o
76. What is the atomic radius of a BCC crystal structure?
Correct : D. a√3/4
77. What is the coordination number of a simple cubic structure?
Correct : A. 6
78. What is the atomic packing factor of BCC structure?
Correct : B. 0.68
79. Which of the following is a point defect in crystals?
Correct : B. interstitialcies
80. The defect that occurs due to a displacement of an ion is known as
Correct : C. frankel defect
81. Which defect does the following figure depict?
Correct : B. schottky defect
82. Which defect does the following diagram represent?
Correct : D. interstitial defect
83. occurs when a foreign substance replaces an atom in a crystal.
Correct : B. substitutional impurity
84. A disturbance in a region between two ideal parts of a crystal is known as
Correct : C. line defect
85. In screw dislocation, the Burger’s vector lies to the dislocation line.
Correct : B. parallel
86. Generation of dislocations can be identified using
Correct : D. frank-read mechanism
87. What are one-dimensional defects?
Correct : C. line defect
88. What are two-dimensional defects?
Correct : A. boundary defect
89. How is the dislocation energy defined?
Correct : A. j m-1
90. Which one of the following, is a line imperfection?
Correct : C. dislocation
91. What is the range of dislocation density in pure and unhardened metals?
Correct : A. 1010 – 1012 m-2
92. What is unit of dislocation density?
Correct : B. m-2
93. 6 BURGER VECTORS, STACKING FAULTS - ROLE OF
Correct : C. increase or decrease in strength depending on dislocation density
94. The number of dislocations increases drastically during
97. What term is used for the defect, produced by an array of dislocations that produces a small difference in orientation between the adjoining lattices?
Correct : D. low angle grain boundary
98. Which statement is false?
Correct : A. plastic deformation decreases dislocation density.
99. Most crystalline materials have dislocations in their as formed state.