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MCQs

Total Questions : 136 | Page 9 of 14 pages
Question 81. In which of the following methods are liquid samples injected into the column in gas chromatography?
  1.    Gas tight syringe
  2.    Micro-syringe
  3.    Rotary sample valve
  4.    Solid injection syringes
 Discuss Question
Answer: Option B. -> Micro-syringe
Answer: (b).Micro-syringe
Question 82. Which of the following is the advantage of a straight packed column?
  1.    It can be packed uniformly
  2.    It can be repacked easily
  3.    It is compact
  4.    It is easier to heat it evenly
 Discuss Question
Answer: Option C. -> It is compact
Answer: (c).It is compact
Question 83. Capillary columns are open tubular columns constructed from which of the following materials?
  1.    Glass
  2.    Metal
  3.    Stainless steel
  4.    Fused silica
 Discuss Question
Answer: Option D. -> Fused silica
Answer: (d).Fused silica
Question 84. What must be done to the solid samples for it to be introduced into the column without using solid injection syringes in gas chromatography?
  1.    Introduced in hot-zone of the column
  2.    Dissolved in volatile liquids
  3.    Introduced using rotary sample valve
  4.    Introduced using sampling loops
 Discuss Question
Answer: Option B. -> Dissolved in volatile liquids
Answer: (b).Dissolved in volatile liquids
Question 85. Which of the following is the commonly used support material for the packed column in gas chromatography?
  1.    Glass
  2.    Metal
  3.    Diatomaceous earth
  4.    Stainless steel
 Discuss Question
Answer: Option C. -> Diatomaceous earth
Answer: (c).Diatomaceous earth
Question 86. Which of the following is the disadvantage of coiled or helical shaped packed chromatographic column?
  1.    It cannot be packed uniformly
  2.    It cannot be repacked easily
  3.    It is not compact
  4.    It is not easy to heat it evenly
 Discuss Question
Answer: Option B. -> It cannot be repacked easily
Answer: (b).It cannot be repacked easily
Question 87. Which of the following is not the advantage of thermal conductivity detector used in gas chromatography?
  1.    Simple in construction
  2.    High sensitivity
  3.    Large linear dynamic range
  4.    Non-destructive character
 Discuss Question
Answer: Option B. -> High sensitivity
Answer: (b).High sensitivity
Question 88. In which of the following detector is the eluent mixed with hydrogen and burned and then mixed with ozone and its intensity is measured?
  1.    Sulphur chemiluminescense detector
  2.    Thermal conductivity detector
  3.    Flame ionization detector
  4.    Electron capture detector
 Discuss Question
Answer: Option A. -> Sulphur chemiluminescense detector
Answer: (a).Sulphur chemiluminescense detector
Question 89. Filter photometer detector is primarily responsive to which of the following compounds/elements?
  1.    Volatile sulphur or phosphorous compounds
  2.    Nitrogen
  3.    Halogen
  4.    Potassium
 Discuss Question
Answer: Option A. -> Volatile sulphur or phosphorous compounds
Answer: (a).Volatile sulphur or phosphorous compounds
Question 90. Which of the following detectors is widely used to detect environmental samples like chlorinated pesticides and polychlorinated biphenyls?
  1.    Flame ionization detector
  2.    Thermal conductivity detector
  3.    Argon ionisation detector
  4.    Electron capture detector
 Discuss Question
Answer: Option D. -> Electron capture detector
Answer: (d).Electron capture detector

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