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MCQs

Total Questions : 57 | Page 3 of 6 pages
Question 21. Sample retention in the column is measured by
  1.    retention index
  2.    retention factor
  3.    all of these
  4.    retention time
 Discuss Question
Answer: Option C. -> all of these
Question 22. Column bleeding occurs when
  1.    traces of the stationary phase are eluted
  2.    the column is cracked and stationary phase leaks out
  3.    the column breaks during installation and causes personal injury
  4.    elution of the analyte is extended over time
 Discuss Question
Answer: Option A. -> traces of the stationary phase are eluted
Question 23. Sample injection is considered successful if
  1.    the sample is spread evenly along the column
  2.    the sample is homogenously spread along the column
  3.    all of the sample in the injector has been added to the column
  4.    the sample is concentrated at the start of the column
 Discuss Question
Answer: Option D. -> the sample is concentrated at the start of the column
Question 24. Doubling the column's length increases resolution by a factor of
  1.    3
  2.    4
  3.    (2)0.5
  4.    2
 Discuss Question
Answer: Option C. -> (2)0.5
Question 25. Which of the following are not used as stationary phases in a GC column?
  1.    Cyclodextrins
  2.    None are used as stationary phases
  3.    Polysiloxanes
  4.    Silica
 Discuss Question
Answer: Option D. -> Silica
Question 26. Which of the following gases is unsuitable for use as a GC carrier gas?
  1.    Nitrogen
  2.    Helium
  3.    All of these
  4.    Oxygen
 Discuss Question
Answer: Option D. -> Oxygen
Question 27.  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
Question 28.  Which of the following detectors give concentration-dependent signals?
  1.    Electron-capture detector
  2.    Thermal conductivity
  3.    Infra-red detector
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 29.  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
Question 30.  What useful information can be found from a Van Deemter plot?
  1.    The selectivity factor
  2.    Optimum mobile phase flow rate
  3.    Optimum column temperature
  4.    Optimum column length
 Discuss Question
Answer: Option B. -> Optimum mobile phase flow rate

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