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MCQs

Total Questions : 57 | Page 6 of 6 pages
Question 51. . 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
Question 52. . 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
Question 53. . 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
Question 54. . 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
Question 55. . 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
Question 56. . 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
Question 57. . 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

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