Environmental (1-20)

1.The consumption of water increases with increase in the distribution

pressure-Higher distribution pressure causes more loss and waste of water.

Select your answer according to the coding system given below

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2.The per capita consumption of a locality is affected by

-climatic conditions,quality of water,distribution pressure

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3.Which of the following causes a decrease in per capita consumption ?

-use of metering system

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4.The hourly variation factor is. usually taken as-1.5

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5.If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be-270000 m 3

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6.The distribution mains are designed for-maximum hourly demand on maximum day

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7.As compared to geometrical increase method of forecasting population, arithmetical increase method gives-lesser value

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8.The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is-10920

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9.The suitable method of forecasting population for a young and rapidly increasing city is-geometrical increase method

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10.The depression of water table in a well due to pumping will be maximum-close to the well

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11.The devices which are installed for drawing water from the sources are called-

intakes

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12.Select the correct relationship between porosity (N), specific yield (y) and

specific retention (R)

-N = y + R

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13.The type of valve, which is provided on the suction pipe in a tube-well, is

-reflux valve

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14.The maximum discharge of a tube-well is about-50 litres/sec

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15.As compared to shallow-wells, deep wells have-more discharge

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16.Ground water is usually free from-suspended impurities

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17.The polluted water is one which-consists of undesirable substances

rendering it unfit for drinking and domestic use

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18.Which of the following is not a water borne disease ?-maleria

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19.The most common cause of acidity in water is-carbon dioxide

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20.The phenolic compounds in public water supply should not be more than-0.001 ppm