The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed (A) 3 (B) 5(C) 7 (D) 9

The dilution ratio at which the odour is hardly detectable is generally called threshold odour 

number and for public supplies it should not exceed 

(A) 3 

(B) 5

(C) 7 

(D) 9 

by

1 Answer

Answer :

(A) 3 

by

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