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MCQs

Total Questions : 57 | Page 4 of 6 pages
Question 31.  The GC trace obtained after an experiment is called a
  1.    chromatograph
  2.    chromatogram
  3.    chromatophore
  4.    graph
 Discuss Question
Answer: Option B. -> chromatogram
Question 32.  Which of these effects result from slow injection of a large sample volume?
  1.    Increased resolution
  2.    Decreased resolution
  3.    Non-linear detector response
  4.    Constant resolution
 Discuss Question
Answer: Option B. -> Decreased resolution
Question 33.  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
Question 34.  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
Question 35. . Which of the following detectors give mass flow-dependent signals?
  1.    Electron capture detector
  2.    Field ionisation detector
  3.    Thermal conductivity detector
  4.    All of the above
 Discuss Question
Answer: Option B. -> Field ionisation detector
Question 36.  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
Question 37. . 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
Question 38. . A retention gap is placed between the injector and the front of the column to
  1.    retain contaminants and prevent them from reaching the column
  2.    retain the sample and release it gradually to the column
  3.    prevent backflush of the injected solution
  4.    all of the above
 Discuss Question
Answer: Option A. -> retain contaminants and prevent them from reaching the column
Question 39. . Headspace analysis is carried out in order to
  1.    analyse volatile compounds from solid or liquid samples
  2.    determine the psychological state of the tutor
  3.    analyse the column contents ahead of the sample
  4.    determine non-volatiles
 Discuss Question
Answer: Option A. -> analyse volatile compounds from solid or liquid samples
Question 40. . Split injection is carried out by
  1.    splitting the sample into smaller portions to inject sequentially
  2.    splitting the sample into smaller portions to inject at the same time through parallel ports
  3.    splitting off some of the sample so that it does not enter the column
  4.    none of the above
 Discuss Question
Answer: Option C. -> splitting off some of the sample so that it does not enter the column

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