30. The current used in the arc discharge method is about
Correct : A. 100ma
31. The carbon contained in the negative electrode sublimates.
Correct : A. true
32. The substrate is heated to
Correct : D. 700c
33. A solid that offers no passage of electricity is called super conductors.
Correct : C. resistance
34. The phenomena of super conductors was first discovered by
Correct : A. kammerlingh onnes
35. The earliest superconductors to be studied elaborately is
Correct : A. niobium alloy
36. The shifting of electrons in super conductors is prevented by
Correct : A. quantum effect
37. The normal metal passes into super conducting state at
Correct : C. critical temperature
38. Based on magnetic response super conductors are of types.
Correct : B. 2
39. The ideal super conductors exhibit
Correct : A. meissner effect
40. This functions as a super conductor at a critical temperature of
Correct : C. 90ok
41. The constituents of this material that is yttrium, barium and copper are in
Correct : C. 1:2:3
42. Annealing the homogeneous mixture to room temperature to retain its
Correct : D. composition, structure and its properties
43. Graphite has layered structure.
Correct : C. planar
44. Bonding between the layers is
Correct : B. weak
45. The graphite is anisotropic.
Correct : A. highly
46. In oxygen containing atmospheres, the graphite readily converted into
Correct : B. carbondioxide
47. Graphite is used in the arc lamp electrode.
Correct : A. true
48. The graphite undergoes corrosion in stainless steel.
Correct : C. pitting corrosion
49. The graphite is
Correct : B. diamagnetic
50. Graphite is also called as
Correct : B. black lead
51. Natural graphite is mostly used in
Correct : A. refrigerators
52. For high sensitivity or selectivity environmental sensors to sense the gaseous chemical like
Correct : D. no
53. The nano materials are used in the light emitted electro luminescence devices.
Correct : A. true
54. The synthesized magnetic nano particles from have been found to self- arrange automatically.
Correct : C. iron
55. The nano particles from iron and palladium are used to produce
Correct : D. magnetic storage devices
56. is the field in which the nano particles are used with silica coated iron oxide iron oxide.
Correct : C. medical diagnosis
57. DNA detection through the by using the oligonucleotide functionalised gold nano crystals is developed.
Correct : A. colorimetric
58. Coating the nano crystals with the ceramics is carried that leads to
Correct : B. corrosion resistant
59. The to the ceramics are superior coatings.
Correct : C. nano crystals coating
60. of ceramic components are easier through nano structuring.
Correct : C. fabrication
61. By nano scale distribution of the in matrix improves the life and performance.
Correct : B. tungsten
62. The extensively used nano particles as catalyst is
Correct : C. gold
63. Due to tensile strength some of the nano materials are used in air crafts.
Correct : A. high
64. Fabrics are extensively made out of nano materials like
Correct : B. fullerenes
65. Which of the following variables govern the different X-ray techniques?
Correct : A. radiation, sample, detector
66. Which of the following rays are used in the powder method of crystals?
Correct : D. monochromatic x-rays
67. In the powder method, in powder sample various samples are also present in every possible orientation.
Correct : B. lattice
68. Which of the following method for detecting the diffracted beams in the powder method of crystals?
Correct : C. guinier method
69. Which of the following shapes are formed by the diffracted radiation in the powder method?
Correct : C. conical
70. In the powder method of the crystals if the Bragg’s angle is Θ then what is the angle of the cone formed by the diffracted beams?
Correct : D. 4Θ
71. During the detection of the cones by the thin strip of film which one of the following statements is appropriate for the cones and the films?
Correct : C. cones intersects the strip of the films
72. What is the disadvantage of the Debye- Scherrer film to obtain the d-spacings?
Correct : B. exposure time is long
73. A convergent beam is obtained by placing which of the following material between the X- ray source and the sample?
Correct : D. bent single crystal of quartz
74. Which of the following is used in electron microscope?
Correct : D. electron beams and magnetic fields
75. 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
76. Degree of scattering in transmission electron microscope is a function of
Correct : C. number and mass of atoms that lie in the electron path
77. Negative Staining is used for examining
Correct : D. virus particles, protein molecules and bacterial flagella
78. Which among the following helps us in getting a three-dimensional picture of the specimen?
Correct : B. scanning electron microscope
79. The secondary electrons radiated back in scanning microscope is collected by?
Correct : B. anode
80. 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
81. The resolution attainable with standard TEM is less than the theoretical value.
Correct : A. true
82. Which of the following component of TEM focuses the beam of electrons on the sample?
Correct : B. condenser lens
83. Image formation in electron microscope is based on
Correct : C. differential scattering
84. The biological materials have little intrinsic capability to
Correct : A. scatter electrons
85. Glutaraldehyde is a
Correct : B. fixative
86. Osmium is a
Correct : B. heavy metal
87. In TEM, the tissue is stained by floating on drops of
Correct : C. heavy metal soutions
88. Shadow casting is a technique of visualizing
Correct : A. isolated particles
89. Surface is usually more than atomic layer deep and is a region of atomic potentials.
Correct : B. one, non-uniform
90. Surface analysis can provide information that classic methods like microscopic cannot.
Correct : A. true
91. In surface spectrometer, which of the following beam is analysed?
Correct : A. reflected beam
92. Which of the following is a type of electron spectroscopy?
Correct : B. auger spectroscopy
93. Surface analysis cannot provide any chemical information directly.
Correct : B. false
94. Which of the following is also known as X- ray photoelectron spectroscopy?
Correct : C. electron spectroscopy for chemical analysis
95. Which of the following methods utilizes the emission of low energy electrons in a process?
Correct : A. auger electron spectroscopy
96. Which of the following is the abbreviation of ESCA?
Correct : C. electron spectroscopy for chemical analysis
97. Which of the following methods use soft X- rays to eject electrons from inner shell orbitals?
Correct : C. electron spectroscopy for chemical analysis
98. Which of the following is the abbreviation of SIMS?
Correct : A. secondary ion mass spectroscopy
99. Which of the following drugs cannot be given as transdermal administration?
Correct : D. drugs against peptic ulcer
100. Which of the following characteristics is suitable for transdermal drug?
Correct : C. drugs with narrow therapeutic indices