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MCQs

Total Questions : 579 | Page 6 of 58 pages
Question 51. Inhalation of silica dust by human being causes
  1.    asphyxiation
  2.    shortness of breath
  3.    tuberculosis
  4.    both (b) & (c)
 Discuss Question
Answer: Option D. -> both (b) & (c)
Answer: (d).both (b) & (c)
Question 52. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
  1.    cesspool
  2.    lagoon
  3.    skimming mill
  4.    septic tank
 Discuss Question
Answer: Option D. -> septic tank
Answer: (d).septic tank
Question 53. Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage ?
  1.    Smog & ozone
  2.    Hydrogen fluoride & nitrogen oxides
  3.    Sulphur dioxide & spray of weed killers
  4.    Carbon monoxide
 Discuss Question
Answer: Option D. -> Carbon monoxide
Answer: (d).Carbon monoxide
Question 54. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
  1.    hydrogen
  2.    carbon dioxide
  3.    ozone
  4.    none of these
 Discuss Question
Answer: Option C. -> ozone
Answer: (c).ozone
Question 55. Insufficient washing of sand grains in a rapid sand filter causes
  1.    air binding
  2.    shrinkage of filtering media
  3.    mud balls
  4.    expansion of filtering media
 Discuss Question
Answer: Option C. -> mud balls
Answer: (c).mud balls
Question 56. Which of the following plants does not emit appreciable amount of SO₂ in atmosphere ?
  1.    Thermal power plant
  2.    Petroleum refinery
  3.    Nitric acid plant
  4.    Sulphuric acid plant
 Discuss Question
Answer: Option C. -> Nitric acid plant
Answer: (c).Nitric acid plant
Question 57. Smog is
  1.    nothing but black smoke.
  2.    a combination of smoke and fog.
  3.    a liquid particle resulting from vapor condensation.
  4.    a solid particle e.g. flyash.
 Discuss Question
Answer: Option B. -> a combination of smoke and fog.
Answer: (b).a combination of smoke and fog.
Question 58. The maximum CO₂ is emitted into the atmosphere by
  1.    combustion
  2.    urea
  3.    biomass burning
  4.    trees
 Discuss Question
Answer: Option A. -> combustion
Answer: (a).combustion
Question 59. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
  1.    3
  2.    30
  3.    70
  4.    100
 Discuss Question
Answer: Option A. -> 3
Answer: (a).3
Question 60. 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's gravity.
 Discuss Question
Answer: Option D. -> Filling in steel crates and shooting it off out of earth's gravity.
Answer: (d).Filling in steel crates and shooting it off out of earth's gravity.

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