Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test Environmental Studies

Water with B.O.D. level of _______ is considered very good.

1

1 - 2 ppm

2

2 - 3 ppm

3

3 - 5 ppm

4

More than one of the above

5

None of the above

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