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MCQs

Total Questions : 68 | Page 6 of 7 pages
Question 51. Main use of scanning electron microscopy in fibre science has been in range of
  1.    medium magnification
  2.    high magnification
  3.    high to medium magnification
  4.    medium to high magnification
 Discuss Question
Answer: Option D. -> medium to high magnification
Answer: (d).medium to high magnification
Question 52. Tapping mode of atomic force microscopy gives
  1.    stiffness to the material
  2.    softness to the material
  3.    strength to the material
  4.    base
 Discuss Question
Answer: Option A. -> stiffness to the material
Answer: (a).stiffness to the material
Question 53. Contrast is emphasized by a technique in which heavy metal atoms are deposited on specimen to give appearance of
  1.    shadows
  2.    light
  3.    dark spots
  4.    halo
 Discuss Question
Answer: Option A. -> shadows
Answer: (a).shadows
Question 54. Increased sensitivity in scanning electron microscopy has resulted in
  1.    reduced exposure time
  2.    limited radiation damage
  3.    both a and b
  4.    increased radiation damage
 Discuss Question
Answer: Option C. -> both a and b
Answer: (c).both a and b
Question 55. Electron microscope is used for specimens that are
  1.    open
  2.    small
  3.    big
  4.    in vacuum
 Discuss Question
Answer: Option D. -> in vacuum
Answer: (d).in vacuum
Question 56. For enhancing contrast, use of staining is done with
  1.    heavy metal compounds
  2.    light metal compounds
  3.    metal compounds
  4.    dual compounds
 Discuss Question
Answer: Option A. -> heavy metal compounds
Answer: (a).heavy metal compounds
Question 57. Magnitude increase in voltage has enabled high voltage electron microscopes to be used with
  1.    thinner specimens
  2.    thicker specimens
  3.    moderate specimens
  4.    crystallized specimens
 Discuss Question
Answer: Option B. -> thicker specimens
Answer: (b).thicker specimens
Question 58. Electrons can only act if they are waves with a wavelength of order of
  1.    0.005 nm
  2.    0.05 nm
  3.    0.5 nm
  4.    0.2 nm
 Discuss Question
Answer: Option A. -> 0.005 nm
Answer: (a).0.005 nm
Question 59. For electron microscopy, specimen must be thin to
  1.    allow passage of electrons
  2.    avoid confusion from the great depths
  3.    both a and b
  4.    allow passage of electrons and protons
 Discuss Question
Answer: Option C. -> both a and b
Answer: (c).both a and b
Question 60. Television screen used in scanning electron microscope for image display is scanned synchronously with the
  1.    array
  2.    spot
  3.    spectrum
  4.    layers
 Discuss Question
Answer: Option B. -> spot
Answer: (b).spot

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