| 31. | Which of the following is used in electron microscope? |
| a. | electron beams |
| b. | magnetic fields |
| c. | light waves |
| d. | electron beams and magnetic fields |
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Answer: (d).electron beams and magnetic fields
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| 32. | Electron Microscope can give a magnification up to ___________ |
| a. | 400,000X |
| b. | 100,000X |
| c. | 15000X |
| d. | 100X |
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Answer: (a).400,000X
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| 33. | Which of the following are true for electron microscopy? |
| a. | specimen should be thin and dry |
| b. | image is obtained on a phosphorescent screen |
| c. | electron beam must pass through evacuated chamber |
| d. | specimen should be thin and dry, image is obtained on a phosphorescent screen and electron beam must pass through evacuated chamber |
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Answer: (d).specimen should be thin and dry, image is obtained on a phosphorescent screen and electron beam must pass through evacuated chamber
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| 34. | Degree of scattering in transmission electron microscope is a function of __________ |
| a. | wavelength of electron beam used |
| b. | number of atoms that lie in the electron path |
| c. | number and mass of atoms that lie in the electron path |
| d. | mass of atoms that lie in the electron path |
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Answer: (c).number and mass of atoms that lie in the electron path
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| 35. | Negative Staining is used for examining _____________ |
| a. | virus particles |
| b. | protein molecules |
| c. | bacterial flagella |
| d. | virus particles, protein molecules and bacterial flagella |
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Answer: (d).virus particles, protein molecules and bacterial flagella
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