Hydrology and Ground Water

61. If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as

1. 0.01 h
2. 0.45 h
3. 0.20 h
4. 0.25 h

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62. If P and A are the perimeter and area of a drainage basin, its compactness coefficient, is

1. P²/2πA
2. P/2πA
3. P/2√πA
4. P³/π³A

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63. If S is the potential infiltration, P is rainfall in cm in a drainage of a soil with fair pasture cover, the direct run off Q in cm is given by

1. Q = (P - 0.1 S)²/(P + 0.4 S)
2. Q = (P - 0.2 S)²/(P + 0.6 S)
3. Q = (P - 0.2 S)²/(P + 0.8 S)
4. Q = (P - 0.2 S)²/(P + 0.2 S)

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64. If the area of storm hydrograph is equal to 102 cm, the ordinates of a unit hydrograph may be obtained by dividing the ordinates of the storm hydrograph by

1. 0.5
2. 1
3. 2
4. 4

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65. If the axial length of a drainage basin is 35 km and its form factor is 0.2, the total area of the basin is

1. 205 sq. km.
2. 215 sq. km.
3. 225 sq. km.
4. 245 sq. km.

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66. If the critical shear stress of a channel is X_C, then the average value of shear stress required to move the grain on the bank is

1. 0.5 X_C
2. 0.75 T_C
3. X_C
4. 1.33 T_C

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67. If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that

1. Demand cannot be met by inflow
2. Reservoir was not full at the beginning
3. Both (A) and (B)
4. None of the above

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68. If the dew point is greater than 0°C

1. Dew will be formed
2. Frost will be formed
3. Vapours will be formed
4. None of these

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69. If the grain size of soil increases

1. Surface area decreases
2. Specific retention decreases
3. Water supply in well increases
4. All the above

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70. If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as

1. 0.10 m
2. 0.20 m
3. 0.5 m
4. 1.0 m

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