Sail E0 Webinar

MCQs

Total Questions : 147 | Page 5 of 15 pages
Question 41. Why is it advantageous to record many FID signals from the same sample and then add them together?
  1.    To ensure that all target nuclei in the sample have been excited
  2.    To remove inaccuracies caused by fluctuations in the applied magnetic field
  3.    To increase sensitivity
  4.    None of the above
 Discuss Question
Answer: Option C. -> To increase sensitivity
Answer: (c).To increase sensitivity
Question 42. Negative staining is a technique used in
  1.    electron microscopy
  2.    gel electrophoresis
  3.    immunocytochemistry
  4.    light microscopy
 Discuss Question
Answer: Option A. -> electron microscopy
Answer: (a).electron microscopy
Question 43. Resolution is proportional to the
  1.    number of theoretical plates in a column
  2.    square root of the number of theoretical plates in a column
  3.    square of the number of theoretical plates in a column
  4.    cube root of the number of theoretical plates in a column
 Discuss Question
Answer: Option B. -> square root of the number of theoretical plates in a column
Answer: (b).square root of the number of theoretical plates in a column
Question 44. In FT-NMR, how are nuclei excited?
  1.    By radio-frequency radiation whose frequency is swept across a predetermined range
  2.    By an intense pulse of radiation which contains a wide range of frequencies
  3.    By an intense pressure
  4.    None of the above
 Discuss Question
Answer: Option A. -> By radio-frequency radiation whose frequency is swept across a predetermined range
Answer: (a).By radio-frequency radiation whose frequency is swept across a predetermined range
Question 45. What is the typical internal diameter of fused silica capillary columns?
  1.    0.2-0.3 mm
  2.    0.3-0.5mm
  3.    0.5-1.0 mm
  4.    1.0-2.0 mm
 Discuss Question
Answer: Option A. -> 0.2-0.3 mm
Answer: (a).0.2-0.3 mm
Question 46. Derivatisation of a sample is carried out to
  1.    reduce polarity of the analytes
  2.    increase the detector response
  3.    increase volatility of the analytes
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 47. Which of the statements is correct?
  1.    Gas chromatography is used to analyse gases
  2.    Gas chromatography is used to analyse solids
  3.    Gas chromatography is used to analyse gases, solutions and solids
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 48. Which of the following gases is unsuitable for use as a GC carrier gas?
  1.    Nitrogen
  2.    Helium
  3.    Oxygen
  4.    All of the above
 Discuss Question
Answer: Option C. -> Oxygen
Answer: (c).Oxygen
Question 49. In column switching chromatography
  1.    compounds trapped on one column are eluted to another column
  2.    one column is removed and replaced by another
  3.    the flow to the column is switched on and off repeatedly
  4.    any of the above
 Discuss Question
Answer: Option A. -> compounds trapped on one column are eluted to another column
Answer: (a).compounds trapped on one column are eluted to another column
Question 50. Which of the following is not used for detection in GC?
  1.    Infrared spectroscopy
  2.    NMR
  3.    Flame ionisation
  4.    Electrical conductivity
 Discuss Question
Answer: Option B. -> NMR
Answer: (b).NMR

Latest Videos

Latest Test Papers