Irrigation Engineering

111. The scour depth D of a river during flood, may be calculated from the Lacey's equation

1. D = 0.47 (Q/f)
2. D = 0.47 (Q/f)^1/2
3. D = 0.47 (Q/f)^1/3
4. D = 0.47 (Q/f)^2/3

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112. The sensitivity of a rigid module, is

1. 2
2. 1.5
3. 1
4. Zero

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113. The sinuosity of a meander is the ratio of

1. Meander length and the width of meander
2. Meander length and half width of the river
3. Curved length and the straight distance
4. None of these

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114. The state of the soil when plants fail to extract sufficient water for their requirements, is

1. Maximum saturated point
2. Permanent wilting point
3. Ultimate utilisation point
4. None of these

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115. The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

1. Syphon
2. Super passage
3. Super-aqueduct
4. Syphon aqueduct

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116. The top of the capillary zone

1. Lies below the water table at every point
2. Lies above the water table at every point
3. Coincides the water table at every point
4. None of these

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117. The top soil of a water logged field becomes more alkaline and infertile if its pH value is

1. 5
2. 7
3. 9
4. 11

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118. The uplift pressure on the roof of an inverted syphon, is maximum when

1. Drain in running dry
2. Canal is running dry
3. Canal is running with F.S.L.
4. Drain is running with H.F.L.

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119. The useful moisture of soil, is equal to its

1. Field capacity
2. Saturation capacity
3. Moisture content at permanent wilting point
4. Difference between filed capacity and permanent wilting point within the root zone of plants

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120. The velocity of drainage water in the barrels of a syphon-aqueduct, is normally limited to

1. 1 to 2 m per second
2. 2 to 3 m per second
3. 3 to 4 m per second
4. 4 to 5 m per second

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