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MCQs

Total Questions : 918 | Page 5 of 92 pages
Question 41. Disinfection of water is done to remove
  1.    Color
  2.    Bad taste
  3.    Foul odour
  4.    Bacteria
 Discuss Question
Answer: Option D. -> Bacteria
Question 42. Which of the following pollutants is absent in the emissions from a fertiliser plant ?
  1.    SO₂ & SO₃
  2.    NO₂
  3.    NH₃
  4.    CO
 Discuss Question
Answer: Option D. -> CO
Question 43. Which is a secondary air pollutant?
  1.    Photochemical smog
  2.    Sulphur dioxide
  3.    Nitrogen dioxide
  4.    Dust particles
 Discuss Question
Answer: Option A. -> Photochemical smog
Question 44. Which of the following is a secondary air pollutant?
  1.    Photochemical smog
  2.    Sulphur dioxide
  3.    Nitrogen dioxide
  4.    Dust particles
 Discuss Question
Answer: Option A. -> Photochemical smog
Question 45. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
  1.    Natural aeration of water stream
  2.    Photosynthetic action of algae
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 46. The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
  1.    1
  2.    5
  3.    10
  4.    20
 Discuss Question
Answer: Option A. -> 1
Question 47. Sulphur dioxide present in the industrial chimney exhaust gases causes
  1.    Respiratory & lung disease
  2.    Reduction in plant's productivity owing to acid rain
  3.    Corrosion of building materials
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 48. Which of the following is not a practical method of low level radioactive waste disposal?
  1.    Dilution with inert material
  2.    Discharging to atmosphere through tall stacks after dilution
  3.    Disposing off in rivers & oceans
  4.    Filling in steel crates and shooting it off out of earth
 Discuss Question
Answer: Option D. -> Filling in steel crates and shooting it off out of earth
Question 49. Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
  1.    Dental cavities
  2.    Scale formation
  3.    Water-borne disease
  4.    Corrosion
 Discuss Question
Answer: Option A. -> Dental cavities
Question 50. Which of the following sources is responsible for maximum air pollution?
  1.    Industrial chimney exhaust
  2.    Forest fire
  3.    Automobiles exhaust
  4.    Photochemical oxidation of organic matter
 Discuss Question
Answer: Option C. -> Automobiles exhaust

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