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MCQs

Total Questions : 100 | Page 8 of 10 pages
Question 71. In polarographic cell when potential is applied, oxygen is reduced at __________ when KCl is present.
  1.    Anode
  2.    Cathode
  3.    Electrolyte
  4.    Both the electrode
 Discuss Question
Answer: Option B. -> Cathode
Answer: (b).Cathode
Question 72. Nitrogen dioxide can be detected with a paramagnetic analyser.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 73. Nitrogen oxide cannot be directly analysed using UV and Visible analyzers due to which of the following reasons?
  1.    Less accuracy
  2.    Very low range
  3.    It leads to contamination of the sample
  4.    It is transparent in UV visible regions
 Discuss Question
Answer: Option D. -> It is transparent in UV visible regions
Answer: (d).It is transparent in UV visible regions
Question 74. Polarographic cells used for measuring the partial pressure of oxygen are temperature-sensitive.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 75. Polarographic cells are used to measure the partial pressure of gases only in static gas monitoring systems and not in continuous streams.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 76. In solid state sensor, when heated to 150° to 300° which of the following occurs?
  1.    Resistance decreases with increase in H₂S concentration
  2.    Resistance increases with H₂S concentration
  3.    No change in resistance occurs
  4.    Sensor does not respond in this temperature range
 Discuss Question
Answer: Option A. -> Resistance decreases with increase in H₂S concentration
Answer: (a).Resistance decreases with increase in H₂S concentration
Question 77. Which of the following is not a detector used in mid Infrared Spectrophotometer?
  1.    Thermopile
  2.    Thermistor
  3.    Pyroelectric cell
  4.    Golay cell
 Discuss Question
Answer: Option D. -> Golay cell
Answer: (d).Golay cell
Question 78. Which of the following is not a component of solid state sensor used for detection of hydrogen sulphide?
  1.    Heater
  2.    Thermistor
  3.    Semiconductor film
  4.    Photo detector
 Discuss Question
Answer: Option D. -> Photo detector
Answer: (d).Photo detector
Question 79. Which of the following occurs in Electrochemical cells used for the detection of hydrogen sulphide?
  1.    Change in resistance
  2.    Redox reaction
  3.    Oxidation-reduction reaction
  4.    Change in colour
 Discuss Question
Answer: Option C. -> Oxidation-reduction reaction
Answer: (c).Oxidation-reduction reaction
Question 80. In the gold film sensor, the change in resistance is proportional to the concentration of H₂S.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True

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