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MCQs

Total Questions : 579 | Page 2 of 58 pages
Question 11. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
  1.    coagulation and flocculation of colloids.
  2.    oxidation of carbonaceous matter to CO₂.
  3.    nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate.
  4.    all (a), (b) and (c).
 Discuss Question
Answer: Option D. -> all (a), (b) and (c).
Answer: (d).all (a), (b) and (c).
Question 12. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
  1.    20
  2.    60
  3.    90
  4.    120
 Discuss Question
Answer: Option C. -> 90
Answer: (c).90
Question 13. Main pollutant present in automobile exhaust is
  1.    CO
  2.    CO₂
  3.    NO
  4.    hydrocarbons
 Discuss Question
Answer: Option A. -> CO
Answer: (a).CO
Question 14. Industrial workers working in leather tanning & manufacturing units are prone to suffer from
  1.    respirtory ailments (e.g. bronchitis).
  2.    skin diseases (e.g. dermatities).
  3.    silicosis.
  4.    blurred vision.
 Discuss Question
Answer: Option B. -> skin diseases (e.g. dermatities).
Answer: (b).skin diseases (e.g. dermatities).
Question 15. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.
  1.    coal ash
  2.    potassium cyanide
  3.    ortho-xylene
  4.    none of these
 Discuss Question
Answer: Option B. -> potassium cyanide
Answer: (b).potassium cyanide
Question 16. COD of raw municipal sewage may be in the range of about __________ mg/litre.
  1.    1-2
  2.    5-10
  3.    90-120
  4.    1500-2500
 Discuss Question
Answer: Option C. -> 90-120
Answer: (c).90-120
Question 17. Dose of chlorine for disinfection of water is about __________ mg/litre of water.
  1.    0.01
  2.    0.1
  3.    0.3
  4.    1
 Discuss Question
Answer: Option D. -> 1
Answer: (d).1
Question 18. Presence of __________ hardness is responsible for the temporary hardness in water.
  1.    carbonate
  2.    calcium
  3.    choride
  4.    sulphate
 Discuss Question
Answer: Option B. -> calcium
Answer: (b).calcium
Question 19. Foul odour and bad taste of water is removed by treating with
  1.    alum
  2.    bleaching powder
  3.    activated carbon
  4.    copper sulphate.
 Discuss Question
Answer: Option C. -> activated carbon
Answer: (c).activated carbon
Question 20. Maximum permissible turbidity in potable water is __________ ppm.
  1.    1
  2.    10
  3.    250
  4.    1000
 Discuss Question
Answer: Option B. -> 10
Answer: (b).10

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