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29/01/2022 12:50 pm
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BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively
(1) A > 50, B < 27
(2) A > 25, B < 17
(3) A < 5, B > 17
(4) A > 15, B > 47
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29/01/2022 12:52 pm
Correct answer: (3) A < 5, B > 17
Explanation:
BOD values of clean water (A) is less than 5 ppm
So A < 5
BOD values of polluted water (B is greater than 17 ppm
So B > 17