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MCQs

Total Questions : 86 | Page 2 of 9 pages
Question 11. Bacteria eat a lot of ammonia produced in the fish gills.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 12. Nitric acid is formed during oxidation of ammonia.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 13. The optimum growth temperature of nitrifying bacteria is __________
  1.    77-86° F
  2.    64° F
  3.    32° F
  4.    46-50° F
 Discuss Question
Answer: Option A. -> 77-86° F
Answer: (a).77-86° F
Question 14. Nitrifying bacteria cannot survive at 0° C.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 15. Nitrogen is returned back into the atmosphere by the activity of _________
  1.    Decomposers
  2.    Dead organisms
  3.    Nitrifying bacteria
  4.    Pathogenic bacteria
 Discuss Question
Answer: Option A. -> Decomposers
Answer: (a).Decomposers
Question 16. Which of the following doesn’t lead to toxicity of waste water?
  1.    Magnesium
  2.    Arsenic
  3.    Lead
  4.    Chromium
 Discuss Question
Answer: Option A. -> Magnesium
Answer: (a).Magnesium
Question 17. What are the symptoms of heavy metals in the body?
  1.    Shortness of breath
  2.    Tingling in your hands and feet.
  3.    Chills
  4.    Night blindness
 Discuss Question
Answer: Option D. -> Night blindness
Answer: (d).Night blindness
Question 18. The detection of heavy metals in drinking water supplies is extremely easy.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 19. The accumulation of definite metals in the body due to certain exposures is called as Heavy metal poisoning.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 20. Heavy metals in water bodies leads to an increase in wastewater treatment cost.
  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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