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The standard BOD test is conducted for

  • A.twenty days at 5 degrees Celsius
  • B.five days at 20 degrees Celsius
  • C.one hour at 37 degrees Celsius
  • D.five hours at 20 degrees Celsius

Answer: B

Dissolved oxygen is measured before and after five days of incubation in the dark at 20 degrees, and the difference is reported as BOD5. Five days captures most but not all of the demand, which is why the figure is a convention rather than a complete measurement.

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