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Civil Engineering Objective Questions { Hydrology }

36. The lowest outlet sluice in a dam is provided
A. below the dead storage
B. on the top level of dead storage
C. on the top level of useful storage
D. at the centre of the dam.

37. Pick up the correct statement from the following :
A. A hydrograph is a plot of discharge versus time
B. A mass curve is a plot of accumulated flow versus time
C. The mass curve continuously rises
D. All the above.

38. Pick up the correct statement from the following
A. Large solids carried along the river bed, is known as bed load
B. The bigger suspended particles get deposited in the head reaches of the reservoir
C. The fine sediment deposits are generally near the face of the dam
D. All the above.

39. The ratio of total capacity and dead storage is kept

40. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,
A. the reservoir will theoretically be silted in 240 years
B. the reservoir will start reducing after 60 years
C. both (a) and (b)
D. neither (a) nor (b).

41.  Pick up the correct statement from the following :
A. The ratio of the total sediment deposited in the reservoir to the total sediment flowing in the river, is called trap efficiency
B. The ratio of the reservoir capacity to the total inflow of water in it, is generally called capacity inflow ratio
C. Small capacity reservoirs on large rivers generally, silt less
D. All the above.

42.  Before constructing a dam, the factor to be considered for controlling sedimentation, is
A. selection of dam site
B. construction of check dams
C. providing vegetation screens
D. All the above.

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