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MCQs

Total Questions : 579 | Page 3 of 58 pages
Question 21. Presence of __________ in water stream are deleterious to aquatic life.
  1.    soluble and toxic organics.
  2.    suspended solids.
  3.    heavy metals and cynides.
  4.    all (a), (b) & (c).
 Discuss Question
Answer: Option D. -> all (a), (b) & (c).
Answer: (d).all (a), (b) & (c).
Question 22. Workers working in __________ industry are most prone to white lung cancer.
  1.    coal mining
  2.    limestone mining
  3.    textile
  4.    asbestos
 Discuss Question
Answer: Option C. -> textile
Answer: (c).textile
Question 23. Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.
  1.    moderately
  2.    highly
  3.    extremely
  4.    very extremely
 Discuss Question
Answer: Option D. -> very extremely
Answer: (d).very extremely
Question 24. Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).
  1.    1
  2.    3
  3.    7
  4.    20
 Discuss Question
Answer: Option D. -> 20
Answer: (d).20
Question 25. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
  1.    75
  2.    95
  3.    120
  4.    140
 Discuss Question
Answer: Option B. -> 95
Answer: (b).95
Question 26. Pick out the wrong statement
  1.    Low ozone layer thickness in polar regions is due to cold climatic conditions
  2.    Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine.
  3.    Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine.
  4.    Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing minamate disease.
 Discuss Question
Answer: Option C. -> Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine.
Answer: (c).Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine.
Question 27. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
  1.    quenching of hot coke.
  2.    discharging in the river stream.
  3.    filtration and recycling for cooling coke oven gas.
  4.    none of these.
 Discuss Question
Answer: Option A. -> quenching of hot coke.
Answer: (a).quenching of hot coke.
Question 28. 5-200 μm size particles are called
  1.    colloids or aerosols
  2.    powder
  3.    dust
  4.    smoke
 Discuss Question
Answer: Option A. -> colloids or aerosols
Answer: (a).colloids or aerosols
Question 29. The progressive warming up of the earth's surface is mainly due to the
  1.    automobile exhaust.
  2.    blanketing effect of CO₂ in the atmosphere.
  3.    de-forestation.
  4.    thickening of ozone layer.
 Discuss Question
Answer: Option B. -> blanketing effect of CO₂ in the atmosphere.
Answer: (b).blanketing effect of CO₂ in the atmosphere.
Question 30. Higher concentration of nitrogen dioxide in atmospheric air causes
  1.    cancer
  2.    bronchitis
  3.    asphyxiation
  4.    corrosion
 Discuss Question
Answer: Option B. -> bronchitis
Answer: (b).bronchitis

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