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Introduction to Waste

For the survi...

Question

For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

A

3 ppm

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B

4 ppm

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C

5 ppm

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D

8 ppm

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Q. Match the columns and find correct option.

	I(Organisms)		II(DDT in ppm)
(a)	Zooplankton	(p)	$0.003$ ppm
(b)	Small fishes	(q)	$2.0$ ppm
(c)	Water	(r)	$25.0$ ppm
(d)	Fish eating birds	(s)	$0.04$ ppm
(e)	Big fishes	(t)	$0.5$ ppm

Q. The T.L.V values of four pollutants A,B,C and D are 9 ppm, 10 ppm, 100 ppm and 500 ppm respectively. The most toxic is:

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