Page No. 43
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The term Biological Oxygen Demand (BOD) is used in relation to ______________________?
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The upper layer of atmosphere is called the ____________________?
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The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?
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Disinfection of water is done to remove ______________________?
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In water treatment plant, zeolite process is used to remove the _____________ of water?
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Salt content in sea water is about ______________ percent?
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______________ is the process of killing organism in water ?
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