E-PolyLearning

36. Which among the following helps us in getting a three-dimensional picture of the specimen?
a. Transmission Electron Microscope
b. Scanning Electron Microscope
c. Compound Microscope
d. Simple Microscope
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Answer: (b).Scanning Electron Microscope

37. The secondary electrons radiated back in scanning microscope is collected by?
a. specimen
b. anode
c. vacuum chamber
d. cathode
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Answer: (b).anode

38. On what factors do the intensity of secondary electrons depends upon?
a. shape of the irradiated object
b. chemical composition of the irradiated object
c. number of electrons ejected
d. size and chemical composition of the irradiated object, number of electrons ejected and on the number of electrons reabsorbed by surrounding
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Answer: (d).size and chemical composition of the irradiated object, number of electrons ejected and on the number of electrons reabsorbed by surrounding

39. Where do we obtain the magnified image of the specimen in SEM?
a. cathode ray tube
b. phosphorescent screen
c. anode
d. scanning generator
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Answer: (a).cathode ray tube

40. Which of the following techniques are used in Transmission Electron Microscopy (TEM) for examining cellular structure?
a. Negative-Staining
b. Shadow Casting
c. Ultrathin Sectioning
d. Negative-Staining, Shadow Casting, Ultrathin Sectioning, Freeze-Etching
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Answer: (d).Negative-Staining, Shadow Casting, Ultrathin Sectioning, Freeze-Etching