Hydrology and Ground Water

71. If the potential infiltration of a water shed having a soil with fair pasture cover, is 10 cm and rainfall is 12 cm, the direct run off is :

1. 2 cm
2. 3 cm
3. 5 cm
4. 7 cm

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72. If the slope of a line for infiltration capacity curve is 1/1.737, the value of constant k in Horton's equation of infiltration capacity curve, is

1. 2
2. 2.5
3. 4
4. 5

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73. If the velocities of flow of a stream of 10 m depth recorded by a current meter at depths of 2 m and 8 m are 0.7 m and 0.3 m respectively, the discharge per unit width of the stream in cubic metres, is

1. 2
2. 3
3. 4
4. 5

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74. If the viscosity of ground water is 1.00, the Slitcher's constant is 400, the effective size of soil particles in aquifer is 0.5 mm and hydraulic gradient is 1 in 80, the velocity of flow is

1. 0.25 m/day
2. 0.50 m/day
3. 1.00 m/day
4. 1.25 m/day

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75. If there are two canals taking off from each flank of a river, then there will be

1. One divides wall and one under-sluice
2. One divides wall and two under-sluices
3. Two divide walls and one under-sluice
4. Two divide walls and two under-sluices

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76. If total run off of a basin of 50 hectares is 0.8 cm, the ordinate of Bernard's distribution graph, may be calculated by the formula (where Q is the discharge in cumecs at the given time)

1. y = 50 Q
2. y = 100 Q
3. y = 200 Q
4. y = 250 Q

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77. If y is the depth of water at any section, then the mean velocity is

1. 0.1 y
2. 0.2 y
3. 0.3 y
4. 0.6 y

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78. In a chute spillway, the flow is usually

1. Uniform
2. Subcritical
3. Critical
4. Super critical

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79. In a Sarda type fall, rectangular crest is used for discharge upto

1. 6 cumecs
2. 10 cumecs
3. 14 cumecs
4. 20 cumecs

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80. In case of non-availability of space due to topography, the most suitable spillway is

1. Straight drop spillway
2. Shaft spillway
3. Chute spillway
4. Ogee spillway

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