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Turbidity is the measure of resistance to the passage of ________________through the water.
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Run-off is the water which flows 
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High turbidity of water can be determined by
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Low turbidity of water can be determined by
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The height of chimney required for effective disposal of 27 kg/h of SO2 emission is
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The maximum permissible quantity of lead in water for domestic supplies is
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When the pH value of water is ___________ the water is said to be acidic.
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The most common cause of acidity in water is
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pH value is a symbol for________________concentration.
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The removal of excess air after placing concrete helps in increasing the strength of concrete by
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