E-PolyLearning

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

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

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

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

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