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MCQs

Total Questions : 579 | Page 56 of 58 pages
Question 551. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?
  1.    Radioactive
  2.    Organic
  3.    Inorganic
  4.    None of these
 Discuss Question
Answer: Option C. -> Inorganic
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 552. Most of the atmospheric air pollutants are present in large quantity in__________________?
  1.    Stratosphere
  2.    Thermosphere
  3.    Troposphere
  4.    Mesosphere
 Discuss Question
Answer: Option C. -> Troposphere
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 553. Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
  1.    20
  2.    100
  3.    400
  4.    200
 Discuss Question
Answer: Option C. -> 400
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 554. ____________ is removed from water by lime-soda process?
  1.    Foul smell and taste
  2.    Iron and manganese
  3.    Temporary hardness
  4.    Permanent hardness
 Discuss Question
Answer: Option C. -> Temporary hardness
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 555. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?
  1.    90
  2.    120
  3.    150
  4.    180
 Discuss Question
Answer: Option B. -> 120
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 556. Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?
  1.    Hydrocarbons
  2.    Hydrogen fluoride
  3.    Hydrogen sulphides
  4.    Nitrogen dioxide
 Discuss Question
Answer: Option B. -> Hydrogen fluoride
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 557. Which of the following is the most major constituents of air pollutants ?
  1.    Oxides of sulphur
  2.    Oxides of nitrogen
  3.    Carbon monoxide
  4.    Hydrogen sulphide
 Discuss Question
Answer: Option A. -> Oxides of sulphur
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 558. Tri-sodium phosphate is used in boiler water treatment to reduce____________________?
  1.    Turbidity
  2.    Caustic embrittlement
  3.    Suspended silica
  4.    Dissolved oxygen
 Discuss Question
Answer: Option B. -> Caustic embrittlement
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 559. ______________ cannot control the noise pollution ?
  1.    Use of silencers
  2.    Green house gases
  3.    Vibration damping
  4.    Tree plantation
 Discuss Question
Answer: Option B. -> Green house gases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 560. Noise level during normal conversation among men is about ______________ decibels?
  1.    10
  2.    45
  3.    90
  4.    115
 Discuss Question
Answer: Option B. -> 45
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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