Q.1
If the water is brown in colour it indicates the presence of which of these?
  • a) Iron
  • b) Manganese
  • c) Arsenic
  • d) Barium
Q.2
How is Iron removed?
  • a) Oxidation
  • b) Clarifier
  • c) HRSCC
  • d) Ultrafiltration
Q.3
What is the safe limit for iron in the water?
  • a) 0.3 ppm
  • b) 0.5 ppm
  • c) 5 ppm
  • d) 1 ppm
Q.4
What is the safe limit for manganese in water?
  • a) 0.05
  • b) 0.15
  • c) 0.2
  • d) 0.25
Q.5
What is the method used to delay the precipitation of oxidized manganese and iron?
  • a) Addition of phosphate
  • b) Addition of nitrate
  • c) Addition of hydrogen
  • d) Addition of chloride
Q.6
What is the concentration of dissolved oxygen required to oxidize 1 ppm of iron?
  • a) 0.14 ppm
  • b) 0.12 ppm
  • c) 0.15 ppm
  • d) 0.20 ppm
Q.7
What is the concentration of dissolved oxygen required to oxidize 1 ppm of manganese?
  • a) 0.2 ppm
  • b) 0.23 ppm
  • c) 0.30 ppm
  • d) 0.27 ppm
Q.8
Which of these methods is not used for the removal of arsenic?
  • a) Activated alumina
  • b) Green sand
  • c) Coagulation by Iron hydroxide
  • d) Activated carbon
Q.9
Considering the total cost which of these is the most expensive method to remove arsenic?
  • a) Green sand
  • b) Activated alumina
  • c) Coagulation by Iron hydroxide
  • d) Tehonoarz method
Q.10
Which of these is the most efficient method to remove arsenic?
  • a) Green sand
  • b) Tehonoarz
  • c) Coagulation by Iron hydroxide
  • d) Activated alumina
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