| 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
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| 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
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| 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
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| 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
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| 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
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