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MCQs

Total Questions : 918 | Page 6 of 92 pages
Question 51. Infective bacteria in water is killed by the __________ process.
  1.    Sterilisation
  2.    Aeration
  3.    Disinfection
  4.    None of these
 Discuss Question
Answer: Option A. -> Sterilisation
Question 52. Ozone level is generally found to be depleted in India in the month of
  1.    February
  2.    July
  3.    April
  4.    December
 Discuss Question
Answer: Option D. -> December
Question 53. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
  1.    t = 15 - 0.0065h
  2.    t = 15 + 0.0065h
  3.    t = 0.0035h -15
  4.    t = 15 - 0.0035h
 Discuss Question
Answer: Option A. -> t = 15 - 0.0065h
Question 54. The commonest form of iron & manganese found in ground water as pollutant is in the form of their
  1.    Carbonates
  2.    Bi-carbonates
  3.    Chlorides
  4.    Sulphides
 Discuss Question
Answer: Option B. -> Bi-carbonates
Question 55. Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr.
  1.    0.1 to 1
  2.    3 to 6
  3.    10 to 15
  4.    15 to 20
 Discuss Question
Answer: Option B. -> 3 to 6
Question 56. Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
  1.    Biological oxidation
  2.    Skimming off
  3.    Settling out using chemical reagents
  4.    Chlorination
 Discuss Question
Answer: Option C. -> Settling out using chemical reagents
Question 57. Which of the following is a manmade source of air pollution?
  1.    Automobile exhaust
  2.    Forest fire
  3.    Bacterial action in soil and swamp areas
  4.    All of the above
 Discuss Question
Answer: Option A. -> Automobile exhaust
Question 58. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
 Discuss Question
Answer: Option A. -> Automobile exhaust
Question 59. 80% less than 200 mesh size particles are called
  1.    Smoke
  2.    Powder
  3.    Grit
  4.    Aggregates
 Discuss Question
Answer: Option B. -> Powder
Question 60. Removal of __________ is accomplished by aeration of water.
  1.    Dissolved gases
  2.    Suspended solids
  3.    Dissolved solids
  4.    None of these
 Discuss Question
Answer: Option A. -> Dissolved gases

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