Scanning Electron microscope Objective Question

1. SEM is used to observe:

  • a) Surface structures and 3-D images
  • b) Surface structures and 4-D images
  • c) Internal structures and 3-D images
  • d) Internal structures and 4-D images

2. SEM combines the principle of:

  • a) Electron Microscopy and Television
  • b) Electron Microscopy and Camera
  • c) Both of the above
  • d) None of the above

3. The image of the object is produced due to the secondary electrons reflected from the specimen by:

  • a) TEM
  • b) CSLM
  • c) DICM
  • d) SEM

4. SEM consists of:

  • a) Cathode ray tube for viewing
  • b) Cathode ray tube for photography
  • c) Both of the above
  • d) None of the above

5. Scanning Electron Microscope (SEM) was devised by:

  • a) Max Knoll, Von Borries, Zworykin, Oatley, Hayes and Pease
  • b) Max Knoll, Von Andrenne, Zworykin, Oatley, Hayes and Pease
  • c) Ernst Ruska, Von Andrenne, Zworykin, Oatley, Hayes and Pease
  • d) Von Andrenne, Zworykin, Oatley, Hayes, Busch and Gabor

6. The scientist who always remained connected with all the phases of development of Electron Microscope, as well as Television scanning is:

  • a) Von Borries
  • b) Von Andrenne
  • c) V. K. Zworykin
  • d) Ernst Ruska

7. In SEM, the electron gun produces a finely focused beam of electrons called:

  • a) Primary electron beam
  • b) Secondary electron beam
  • c) Tertiary electron beam
  • d) Both a and b

8. In SEM, the secondary electrons entering the detector strike a scintillator to:

  • a) Produce electric current
  • b) Release energy
  • c) Release light flashes
  • d) Release heat

9. In SEM, the number of secondary electrons that reach to the detector will depend on the nature of the specimen surface:

  • a) Large number of electrons enters into the detector when electron beam strikes the raised area.
  • b) Small number of electrons escape the depression and enter into the detector
  • c) Both a and b
  • d) None of the above

10. In SEM, the flash light is converted into electric current by:

  • a) Amplifier
  • b) Photo multiplier
  • c) Electron gun
  • d) Both a and b