Scanning probe microscopy Objective Question

1. Scanning Tunneling Microscope can achieve magnification of:

  • a) 350 million
  • b) 250 million
  • c) 100 million
  • d) 10 million

2. STM contains a very sharp needle like probe is an amalgamation of:

  • a) Copper and iridium
  • b) Platinum and iridium
  • c) Copper and Platinum
  • d) None of the above

3. The STM probe is so sharp that often there is only one _ at its tip:

  • a) Molecule
  • b) Atom
  • c) Electron
  • d) DNA

4. In STM, if the probe is moved away by a distance that equals the diameter of an atom:

  • a) The current decreases by 10-fold
  • b) The current decreases by 100-fold
  • c) The current decreases by 1000-fold
  • d) The current decreases by 10000-fold

5. STM is used to view:

  • a) DNA
  • b) Biological molecules
  • c) Virus infected cells
  • d) All of the above

6. Atomic Force Microscope (AFM) is used to measure the atomic size to about:

  • a) 0.01 µm
  • b) 0.1 µm
  • c) 1 µm
  • d) 10 µm

7. Objects immersed in water can be viewed in _ microscopy:

  • a) SEM
  • b) STM
  • c) TEM
  • d) AFM

8. In AFM, the tip used to probe the surface is connected with a:

  • a) Covalent bond
  • b) Ionic bond
  • c) Cantilever
  • d) Both a and b

9. In AFM, when the probe passes over the raised and the depressed surface of the specimen:

  • a) The cantilever is deflected vertically
  • b) The cantilever is deflected horizontally
  • c) The cantilever is attracted vertically
  • d) The cantilever is attracted horizontally

10. In AFM, the light reflected from the cantilever is detected by:

  • a) L.C.D.
  • b) L.E.D.
  • c) Photo diode
  • d) None of the above

11. In AFM, the vertical movement of cantilever is measured by:

  • a) Cosmic beam
  • b) Laser beam
  • c) Infra-red
  • d) Gamma rays

12. Who invented the Scanning Probe Microscope?

  • a) Antony Van Leeuwenhoek
  • b) Gerd Binning and Heinrich Rohrer
  • c) Jenson and Jenson
  • d) Knoll and Ruska

13. The major advantage of a Scanning Probe Microscope is:

  • a) 3-D view of intracellular structure
  • b) 3-D image of the surface atoms
  • c) Growth study
  • d) None of the above

14. Gerd Binnig, Heinrich Rohrer were awarded a Nobel prize for inventing:

  • a) Scanning Tunneling Microscope
  • b) Dark Field Microscope
  • c) Transmission Electron Microscope
  • d) Bright Field Microscope

15. Scanning tunneling microscope (STM) can produce magnification up to:

  • a) 1 million
  • b) 10 million
  • c) 100 million
  • d) 1000 million

16. In Atomic Force Microscope, a sharp probe is moved over the specimen surface while keeping the distance between the:

  • a) Probe tip and the surface, variable
  • b) Probe tip and the surface, constant
  • c) Lever and the probe, constant
  • d) Lever and the probe, variable

17. AFM can be used to study:

  • a) Surfaces with less humidity
  • b) Surfaces with very high humidity
  • c) Surfaces which are not good conductor of electricity
  • d) Surfaces which are good conductor of electricity

18. Scanning probe microscopy uses:

  • a) CSLM
  • b) AFM
  • c) DIC
  • d) SEM

19. The microscope used to study DNA and differentiation of nitrogen base like adenine and guanine and various proteins is:

  • a) DICM
  • b) TPM
  • c) AFM
  • d) STM

20. With STM one can exclusively observe:

  • a) Proteins
  • b) Amino acids
  • c) Hydrogen atom
  • d) All of the above

21. Identify microscopy from image shown below:

Screenshot 143
  • a) AFM
  • b) CSLM
  • c) STM
  • d) TEM

22. Identify microscopy from image shown below:

Screenshot 141
  • a) AFM
  • b) CSLM
  • c) STM
  • d) TEM

23. Identify microscopy from image shown below:

Screenshot 142
  • a) AFM
  • b) CSLM
  • c) STM
  • d) SEM