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MCQs

Total Questions : 45 | Page 4 of 5 pages
Question 31. A stripper column used in gas chromatography, can be used to retain which of the following when an air sample is passed through it?
  1.    CO
  2.    Methane
  3.    Light hydrocarbons
  4.    Heavy hydrocarbons
 Discuss Question
Answer: Option D. -> Heavy hydrocarbons
Answer: (d).Heavy hydrocarbons
Question 32. Which of the following is not a component of the mixture present in the reference cell of Non-dispersive infrared analyzer?
  1.    CO
  2.    Nitrogen
  3.    Water vapour
  4.    Hydrogen
 Discuss Question
Answer: Option D. -> Hydrogen
Answer: (d).Hydrogen
Question 33. Which of the following methods cannot be used for the estimation of hydrocarbons?
  1.    Mass spectroscopy
  2.    Chemiluminescence method
  3.    Ultraviolet absorption
  4.    Gas chromatography
 Discuss Question
Answer: Option B. -> Chemiluminescence method
Answer: (b).Chemiluminescence method
Question 34. Hydrogen flame ionization detector can be used to detect only the peak of CO and not methane.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 35. CO analyzers based on infrared absorption would give greater sensitivity under which of the following conditions?
  1.    With larger cell path lengths
  2.    With smaller cell path lengths
  3.    By changing the gases in the reference cell
  4.    By increasing the sample flow rate
 Discuss Question
Answer: Option A. -> With larger cell path lengths
Answer: (a).With larger cell path lengths
Question 36. In Saltzman method, which of the following are formed when air containing NO₂ is passed in an absorbing solution consisting of the sulphanilic acid and diamine dissolved in the acetic acid medium?
  1.    Blue colour dye complex
  2.    Green colour dye complex
  3.    Pink colour dye complex
  4.    Orange colour dye complex
 Discuss Question
Answer: Option C. -> Pink colour dye complex
Answer: (c).Pink colour dye complex
Question 37. In the conductivitimetric method, to measure the conductivity of the cell, 5V ___________ is applied across the electrodes.
  1.    DC
  2.    AC
  3.    Pulsating DC
  4.    DC or AC
 Discuss Question
Answer: Option B. -> AC
Answer: (b).AC
Question 38. The response of coulometric method is instantaneous.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 39. In conductivitimetric method, the concentration of sulphur dioxide is proportional to which of the following parameters of the saw-tooth waveform?
  1.    Average voltage
  2.    Peak voltage
  3.    Slope
  4.    RMS voltage
 Discuss Question
Answer: Option C. -> Slope
Answer: (c).Slope
Question 40. Which of the following is the wavelength of the radiation generated when an air stream containing sulphur dioxide is burned in a hydrogen-rich flame?
  1.    243 nm
  2.    394 nm
  3.    467 nm
  4.    516 nm
 Discuss Question
Answer: Option B. -> 394 nm
Answer: (b).394 nm

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