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MCQs

Total Questions : 100 | Page 7 of 10 pages
Question 61. Which of the following bridges are used in magnetic wind instruments?
  1.    Wheatstone bridge
  2.    Kelvin’s bridge
  3.    Anderson’s bridge
  4.    Schering’s bridge
 Discuss Question
Answer: Option A. -> Wheatstone bridge
Answer: (a).Wheatstone bridge
Question 62. How are the hydrocarbons in the samples removed in magnetic wind instruments?
  1.    By using a cold trap
  2.    By using a filter
  3.    By using a semipermeable membrane
  4.    By using magnetic effect
 Discuss Question
Answer: Option A. -> By using a cold trap
Answer: (a).By using a cold trap
Question 63. The extremely high inertia of the thin membrane in the oxygen sensor allows it to rapidly attain equilibrium.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 64. Which of the following is not true about the galvanic method of oxygen analysis?
  1.    Electrodes are composed of noble and base metals
  2.    It can measure dissolved content of oxygen
  3.    Its principle is based on electrolysis
  4.    It utilizes an electronic cell
 Discuss Question
Answer: Option C. -> Its principle is based on electrolysis
Answer: (c).Its principle is based on electrolysis
Question 65. Which of the following is true about Hersch cell which is one of the arrangements of a galvanic cell?
  1.    Cell is spherical in shape
  2.    Cathode is made of porous material
  3.    Cathode is placed centrally
  4.    Cathode is formed by gauze which surrounds the anode
 Discuss Question
Answer: Option D. -> Cathode is formed by gauze which surrounds the anode
Answer: (d).Cathode is formed by gauze which surrounds the anode
Question 66. Polarographic cells type of electrochemical method uses which of the following concepts?
  1.    Cyclic reactions
  2.    Exothermic reactions
  3.    Reversible reactions
  4.    Redox reactions
 Discuss Question
Answer: Option D. -> Redox reactions
Answer: (d).Redox reactions
Question 67. Conductometric method is not very suitable for measuring traces of which of the following gases in ppb range?
  1.    H₂S
  2.    SO₂
  3.    NH₃
  4.    CO
 Discuss Question
Answer: Option D. -> CO
Answer: (d).CO
Question 68. In the conductometric method, the difference in gas conductivity before and after passing sample gas denotes which of the following?
  1.    Efficiency of the cell
  2.    Quantity of reagent
  3.    Concentration of gas
  4.    Density of the reagent
 Discuss Question
Answer: Option C. -> Concentration of gas
Answer: (c).Concentration of gas
Question 69. Which of the following methods, is the widely used method for trace gas analysis?
  1.    Galvanic methods
  2.    Conductometric method
  3.    Polarographic cells
  4.    Thermal conductivity method
 Discuss Question
Answer: Option B. -> Conductometric method
Answer: (b).Conductometric method
Question 70. Polarographic cells are not sensitive to which of the following gases?
  1.    Carbon monoxide
  2.    Carbon dioxide
  3.    Nitrous oxide
  4.    Oxygen
 Discuss Question
Answer: Option A. -> Carbon monoxide
Answer: (a).Carbon monoxide

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