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MCQs

Total Questions : 133 | Page 6 of 14 pages
Question 51. If to one pair of electrodes one potential with one sign is applied, which of the following is applied to the other pair of electrodes?
  1.    Same potential with same sign
  2.    Different potential with same sign
  3.    Different potential with different sign
  4.    Same potential with different sign
 Discuss Question
Answer: Option D. -> Same potential with different sign
Answer: (d).Same potential with different sign
Question 52. In cases where differentiation is required between very similar substances, which of the following techniques making use of quadrupole principle is preferred?
  1.    Evaporation mass spectrometry
  2.    Pyrolysis mass spectrometry
  3.    Plasma mass spectrometry
  4.    Trapped ion mass spectrometry
 Discuss Question
Answer: Option B. -> Pyrolysis mass spectrometry
Answer: (b).Pyrolysis mass spectrometry
Question 53. Which of the following is the heart of quadrupole instrument?
  1.    Electrodes
  2.    Choke
  3.    DC potential
  4.    Detector
 Discuss Question
Answer: Option A. -> Electrodes
Answer: (a).Electrodes
Question 54. Which of the following has to be done to increase the resolution of the quadrupole mass spectrometer?
  1.    Increasing distance between detector and reflectron
  2.    Increasing difference between the individual rf accelerating stages
  3.    Increasing the length of the drift tube
  4.    Increasing the rod length of the electrode
 Discuss Question
Answer: Option D. -> Increasing the rod length of the electrode
Answer: (d).Increasing the rod length of the electrode
Question 55. Which of the following does not affect the resolution of the instrument?
  1.    Changing length of electrode
  2.    Changing slope of scan line
  3.    Quality of machining of the rods
  4.    Changing length of drift tube
 Discuss Question
Answer: Option D. -> Changing length of drift tube
Answer: (d).Changing length of drift tube
Question 56. In pyrolysis spectrometry, heating is done until which of the following is reached?
  1.    Curie point
  2.    Boiling point
  3.    Until production of superheated vapour
  4.    Until 100°C
 Discuss Question
Answer: Option A. -> Curie point
Answer: (a).Curie point
Question 57. Which of the following is used to cool the ion source?
  1.    Liquid sodium shield
  2.    Liquid nitrogen shield
  3.    Water
  4.    Freon
 Discuss Question
Answer: Option B. -> Liquid nitrogen shield
Answer: (b).Liquid nitrogen shield
Question 58. In quadrupole mass spectrometer, the ratio u/v is mass dependent, where ‘u’ is the DC voltage and ‘v’ is the peak amplitude.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 59. When a value of q is kept constant, the value of m/e is proportional to which of the following when ‘m’ is the mass number, ‘e’ is the electric charge, ‘u’ is the DC potential, ‘v’ is the peak amplitude and ‘f’ is the frequency?
  1.    u/v ratio
  2.    u
  3.    v
  4.    f
 Discuss Question
Answer: Option C. -> v
Answer: (c).v
Question 60. Which of the following is not an ion transducer or detector?
  1.    Faraday cup collector
  2.    Channeltron
  3.    Micro-channel plate
  4.    Flame ionization detector
 Discuss Question
Answer: Option D. -> Flame ionization detector
Answer: (d).Flame ionization detector

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