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Previous Year SSC CHSL 2017 Tier I Questions

What does BOD5 refer to?

[A]  Biochemical Oxygen Demand in 5 days
[B]  Biochemical Oxygen Demand in 5 hours
[C] Biochemical Oxygen Demand in 5 minutes
[D]Biochemical Oxygen Demand in 5 Months

Answer & Explanation

Answer: Option [A]

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