Water Supply Engineering

91. Gravity conduits for carrying water from the source are

1. Canals
2. Flumes
3. Aqueducts
4. All the above

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92. Ground water from artesian wells

1. Contains no suspended materials
2. Contains dissolved salts
3. May be saltish and hard
4. All the above

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93. Growth of population can be conveniently represented by

1. An arithmetical curve
2. A semi-logarithmic curve
3. A logistic curve
4. A straight line curve

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94. Hard water contains

1. Calcium
2. Magnesium bicarbonates
3. Magnesium sulphate
4. All the above

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95. Hard water for public water supply is discarded because

1. It consumes more soap
2. It contains lot of turbidity
3. It contains pathogenic bacterias
4. It possesses bad taste and odour

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96. Hardness of water can be removed by boiling if it is due to

1. Calcium bicarbonates
2. Calcium sulphates
3. Calcium chloride
4. Calcium nitrates

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97. Hardness of water is caused by

1. Presence of soap lather
2. Presence of chlorides and sulphates of sodium and potassium
3. Presence of bicarbonates, sulphates or chlorides of calcium and magnesium
4. Turbidity

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98. Hardness of water is caused due to

1. Calcium sulphate
2. Magnesium sulphate
3. Calcium nitrates
4. All the above

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99. High pH value of water does not produce

1. Incrustation
2. Sediment deposits
3. Tuberculation
4. None of these

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100. Higher yield may be expected from

1. Gravity springs
2. Surface springs
3. Artesian springs
4. All the above

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