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MCQs

Total Questions : 147 | Page 6 of 15 pages
Question 51. 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
Answer: (b).Decreased resolution
Question 52. Sample retention in the column is measured by
  1.    retention time
  2.    retention factor
  3.    retention index
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 53. The GC trace obtained after an experiment is called a
  1.    chromatograph
  2.    chromatogram
  3.    chromatophore
  4.    graph
 Discuss Question
Answer: Option B. -> chromatogram
Answer: (b).chromatogram
Question 54. 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
Answer: (b).Optimum mobile phase flow rate
Question 55. 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
Answer: (d).All of these
Question 56. Column bleeding occurs when
  1.    elution of the analyte is extended over time
  2.    the column is cracked and stationary phase leaks out
  3.    traces of the stationary phase are eluted
  4.    the column breaks during installation and causes personal injury
 Discuss Question
Answer: Option C. -> traces of the stationary phase are eluted
Answer: (c).traces of the stationary phase are eluted
Question 57. Which of the following are not used as stationary phases in a GC column?
  1.    Polysiloxanes
  2.    Silica
  3.    Cyclodextrins
  4.    None are used as stationary phases
 Discuss Question
Answer: Option B. -> Silica
Answer: (b).Silica
Question 58. Doubling the column's length increases resolution by a factor of
  1.    (2)^0.5
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option A. -> (2)^0.5
Answer: (a).(2)^0.5
Question 59. Sample injection is considered successful if
  1.    all of the sample in the injector has been added to the column
  2.    the sample is concentrated at the start of the column
  3.    the sample is spread evenly along the column
  4.    the sample is homogenously spread along the column
 Discuss Question
Answer: Option B. -> the sample is concentrated at the start of the column
Answer: (b).the sample is concentrated at the start of the column
Question 60. Theoretical plates are used to
  1.    estimate the efficiency of a column
  2.    determine the thickness of the stationary phase
  3.    measure the distribution of the analyte between mobile and stationary phases
  4.    None of the above
 Discuss Question
Answer: Option A. -> estimate the efficiency of a column
Answer: (a).estimate the efficiency of a column

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