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MCQs

Total Questions : 147 | Page 14 of 15 pages
Question 131. The frequency of precession, the transition frequency and the Larmor frequency are
  1.    same terms for the different frequency
  2.    same terms for the same frequency
  3.    different terms for the same frequency
  4.    different terms for the different frequency
 Discuss Question
Answer: Option C. -> different terms for the same frequency
Question 132. In scanning electron microscopy
  1.    a specimen is not fixed and then coated with thin layer of a heavy metal
  2.    a specimen is fixed and then coated with transition metal
  3.    None of these
  4.    a specimen is fixed and then coated with thin layer of a heavy metal
 Discuss Question
Answer: Option D. -> a specimen is fixed and then coated with thin layer of a heavy metal
Question 133. What does the Michelson interferometer do?
  1.    Split a polychromatic beam of radiation into its component wavelengths
  2.    Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
  3.    Selectively filter certain wavelengths from a beam of I.R. radiation
  4.    None of these
 Discuss Question
Answer: Option B. -> Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
Question 134. Cytochrome C has an isoelectric pH of
  1.    10.05
  2.    11.05
  3.    7.5
  4.    8.5
 Discuss Question
Answer: Option A. -> 10.05
Question 135. How many possible orientations do spin 1/2 nuclei have when they are located in an applied magnetic field?
  1.    2
  2.    4
  3.    6
  4.    3
 Discuss Question
Answer: Option A. -> 2
Question 136. In immunofluroscence microscopy, fluroscent compounds are attached to
  1.    bound antibody specific for the subcellular structure
  2.    an antibody specific for the subcellular structure
  3.    an antigen specific for the subcellular structure
  4.    none of these
 Discuss Question
Answer: Option B. -> an antibody specific for the subcellular structure
Question 137. When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens?
  1.    None of these
  2.    The processional frequency of the nucleus increases
  3.    The nucleus spins faster
  4.    The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
 Discuss Question
Answer: Option D. -> The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
Question 138. An FT-IR instrument record a signal in the
  1.    none of these
  2.    both (a) and (b)
  3.    frequency domain
  4.    time domain
 Discuss Question
Answer: Option D. -> time domain
Question 139. How do you turn a signal recorded in the time domain into a frequency domain signal?
  1.    Fourier transformation
  2.    Measurement of peak areas
  3.    By use of a Michelson interferometer
  4.    None of the above
 Discuss Question
Answer: Option A. -> Fourier transformation
Question 140. Negative staining is a technique used in
  1.    immunocytochemistry
  2.    gel electrophoresis
  3.    light microscopy
  4.    electron microscopy
 Discuss Question
Answer: Option D. -> electron microscopy

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