Water sample is called cleanest on the basis of which one of the BOD values given below

Question:

Water sample is called cleanest on the basis of which one of the BOD values given below

  1. $11 \mathrm{ppm}$

  2. $15 \mathrm{ppm}$

  3. 3 ppm

  4. $21 \mathrm{ppm}$

Correct Option: , 3

Solution:

Clean water could have BOD value of less than $5 \mathrm{ppm}$ whereas highly polluted water could have a BOD value of $17 \mathrm{ppm}$ or more.

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