| 1. | The maximum permissible chlorine content for public supplies should be between ? | |
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0.1 to 0.2 ppm
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0.3 to 0.4 ppm
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1.2 to 4 ppm
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6.5 to 8 ppm
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Report Question| 2. | Run-off is the water which flows ? | |
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in infiltration galleries
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in sewer pipes
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due to leakage of pipes
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in rivers
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| 3. | The maximum permissible quantity of iron and manganese in water for domestic purposes should be ? | |
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0.1 ppm
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0.3 ppm
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0.6 ppm
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0.8 ppm
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| 4. | The layers such as lime stone and sand stone which do not allow the water to pass through them are known as ? | |
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aquifers
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aquiclude
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aquifuge
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none of these
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| 5. | Suspended impurities consist of ? | |
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iron
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chlorine
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bacteria
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all of these
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| 6. | The maximum permissible total solid content in water for domestic purposes should not exceed ? | |
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300 ppm
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400 ppm
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500 ppm
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1000 ppm
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| 7. | Which of the following statement is correct ? | |
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The rate of silting in a reservoir is more in the beginning and less in the end
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At the economical height of a dam, its cost per million cubic metre of storage is minimum
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The percentage of water required for public use amounts to about 10% of the total water requirements
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all of the above
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| 8. | The alkalinity in water is caused by ? | |
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sodium carbonate
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potassium carbonate
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calcium hydroxide
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all of these
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| 9. | An artesian spring is formed ? | |
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when an aquifer gets exposed in a valley against a vertical cut
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due to continuous fault in a rock through which water under pressure comes out
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when a porous strata gets enclosed between two impervious strata
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none of the above
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| 10. | Which of the following statement is wrong ? | |
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The quality of tube well water is better than that of surface sources
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The discharge of tube well is more than that of an open well
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The tube well should not derive water from the first previous strata
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none of the above
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