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MCQs

Total Questions : 918 | Page 4 of 92 pages
Question 31. 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
Question 32. Corrosion in boilers can be prevented by
  1.    Deaeration of feed water
  2.    Enhancing pH of feed water by adding alkali
  3.    Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 33. Iron & manganese present as pollutant in water can not be removed by
  1.    Ion exchange process
  2.    Oxidation followed by settling & filtration
  3.    Lime soda process or manganese zeolite process
  4.    Chlorination
 Discuss Question
Answer: Option D. -> Chlorination
Question 34. Which of the following is the most widely used disinfectant in water treatment?
  1.    Chlorine
  2.    Irradiation of water by ultraviolet light
  3.    Cation exchanger
  4.    Coagulation
 Discuss Question
Answer: Option A. -> Chlorine
Question 35. The widest explosive limit is of __________ , thereby making it the most explosive gas.
  1.    Acetylene
  2.    Petrol vapor
  3.    Hydrogen
  4.    Carbon monoxide
 Discuss Question
Answer: Option A. -> Acetylene
Question 36. Siderosis is a disease caused by the inhalation of __________ dust.
  1.    Coal
  2.    Silica
  3.    Iron
  4.    None of these
 Discuss Question
Answer: Option C. -> Iron
Question 37. 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
  1.    Coal
  2.    Uranium ore
  3.    Iron ore
  4.    Lime
 Discuss Question
Answer: Option A. -> Coal
Question 38. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
  1.    CO₂
  2.    SO₂
  3.    Hydrocarbons
  4.    CFC (chloro fluoro carbon)
 Discuss Question
Answer: Option D. -> CFC (chloro fluoro carbon)
Question 39. Scale formation in boiler is controlled by
  1.    Preheating of feed water
  2.    Reduction in hardness, silica & alumina in feed water
  3.    Keeping the pH value of feed water just below 7
  4.    Eliminating H₂S in feed water
 Discuss Question
Answer: Option B. -> Reduction in hardness, silica & alumina in feed water
Question 40. Pick out the wrong statement.
  1.    Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions
  2.    Inhalation of pollutant carbon monoxide results in death by asphyxiation
  3.    Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles
  4.    Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere
 Discuss Question
Answer: Option C. -> Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles

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