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MCQs

Total Questions : 53 | Page 3 of 6 pages
Question 21. Which has the correct descending order of Inhibitory Capacity?
  1.    Propionic > Butyric > Acetic > Lactic
  2.    Propionic > Acetic > Butyric > Lactic
  3.    Lactic > Butyric > Acetic > Propionic
  4.    Lactic > Acetic > Butyric > Propionic
 Discuss Question
Answer: Option A. -> Propionic > Butyric > Acetic > Lactic
Answer: (a).Propionic > Butyric > Acetic > Lactic
Question 22. Which of these are acetotropic methanogens?
  1.    Methanoculleus thermophilicus, Methanosphaera stadtmanii
  2.    Methanosarcina thermophila, Methanosaeta concilii
  3.    Methanosarcina thermophila, Methanosphaera stadtmanii
  4.    Methanoculleus thermophilicus, Methanosarcina thermophila
 Discuss Question
Answer: Option B. -> Methanosarcina thermophila, Methanosaeta concilii
Answer: (b).Methanosarcina thermophila, Methanosaeta concilii
Question 23. Which of these bacteria is a redox mediator in microbial fuel cells?
  1.    Pseudomonas aeruginosa
  2.    Geothrix ferementans
  3.    Desulfuromonas acetoxidans
  4.    Shewanella oneidenensis
 Discuss Question
Answer: Option B. -> Geothrix ferementans
Answer: (b).Geothrix ferementans
Question 24. Acidithiobacillus sp. is used to extract what kind of metal ore?
  1.    Oxide
  2.    Carbonate
  3.    Silicate
  4.    Sulphate
 Discuss Question
Answer: Option D. -> Sulphate
Answer: (d).Sulphate
Question 25. Which type of ore is the major source of nickel?
  1.    Oxide
  2.    Sulfide
  3.    Carbonate
  4.    Ferrous
 Discuss Question
Answer: Option B. -> Sulfide
Answer: (b).Sulfide
Question 26. In the studies of Joffe and Sperll, it was observed that ________ is efficient for solubilizing Ni but the presence of ______ had adverse effect on leaching.
  1.    T. ferrooxidans; cobalt
  2.    T.trioxidanes; molybdenum
  3.    T. ferrooxidans; molybdenum
  4.    T. trioxidanes; cobalt
 Discuss Question
Answer: Option C. -> T. ferrooxidans; molybdenum
Answer: (c).T. ferrooxidans; molybdenum
Question 27. Which leaching agent is used for the slow decomposition of refractory gold ores?
  1.    Nickel
  2.    Sulphur
  3.    Cyanide
  4.    Molybdenum
 Discuss Question
Answer: Option C. -> Cyanide
Answer: (c).Cyanide
Question 28. Bacterial leaching is possible with low concentrations and requires little energy inputs.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 29. Which of the following can absorb dissolved phosphorus from sewage sludge?
  1.    Phosphorus accumulating microbes
  2.    Magnesium accumulating microbes
  3.    Copper accumulating microbes
  4.    Zinc accumulating microbes
 Discuss Question
Answer: Option A. -> Phosphorus accumulating microbes
Answer: (a).Phosphorus accumulating microbes
Question 30. Phosphorus accumulating microbes can store phosphorus in their cells.
  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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