Hydrology and Water Resources Engineering Practice Test - Set 06 - ObjectiveBooks

Hydrology and Water Resources Engineering Practice Test - Set 06

Practice Test: Question Set - 06

1. For wave action in dams, the maximum height of freeboard is generally taken to be equal to
    (A) 0.5 hw
    (B) 0.75 hw
    (C) 1.25 hw
    (D) 1.50 hw
Where ‘hw’ is height of wave

2. Infiltration capacity of soil depends upon
    (A) Number of voids present in the soil
    (B) Shape and size of soil particles
    (C) Arrangement of soil particles
    (D) All the above

3. Which of the following spillways is least suitable for an earthen dam?
    (A) Ogee spillway
    (B) Chute spillway
    (C) Side channel spillway
    (D) Shaft spillway

4. Pick up the correct statement from the following:
    (A) Absolute humidity at a given temperature is equal to weight of moisture present in a unit volume
    (B) Relative humidity is the ratio of actual vapour pressure and saturation vapour pressure at the same temperature
    (C) Relative humidity is the ratio of the weight of the vapours present per unit volume to the weight of vapours which could be contained at the same temperature when fully saturated
    (D) All the above

5. According to Khosla’s theory, the exit gradient in the absence of a downstream cut-off is
    (A) 0
    (B) Unity
    (C) Infinity
    (D) Very large

6. In India the recording type rain gauge generally used, is
    (A) Weighing type
    (B) Tipping type
    (C) Float recording type
    (D) None of these

7. Which of the following can be used as a meter fall?
    (A) Vertical drop fall
    (B) Flumed glacis fall
    (C) Unflumed glacis fall
    (D) All of the above

8. The critical depth in a channel can be produced
    (A) By raising the bottom of the channel
    (B) By lowering the bottom of the channel
    (C) By decreasing the width of the channel
    (D) Both (a) and (c) of above

9. The main cause of meandering is
    (A) Presence of an excessive bed slope in the river
    (B) Degradation
    (C) The extra turbulence generated by the excess of river sediment during floods
    (D) None of the above

10. The run off a drainage basin is
    (A) Initial recharge + ground water accretion + precipitation
    (B) Precipitation + ground water accretion + initial recharge
    (C) Precipitation - ground water accretion + initial recharge
    (D) Precipitation - ground water accretion - initial recharge

11. The net speed under which the turbine reaches its peak efficiency is called
    (A) Design speed
    (B) Rated speed
    (C) Gross speed
    (D) Operating speed

12. The quantity of water retained by the sub-soil against gravity, is known
    (A) Yield
    (B) Porosity
    (C) Specific yield
    (D) Specific retention

13. To determine the discharge at a section in a stream from its rating curve, the required data are
    (i) Slope of water surface at the section
    (ii) Stage at the section
    (ii) Current meter readings at the section
The correct answer is
    (A) (i) and (ii)
    (B) (ii) and (iii)
    (C) Only (ii)
    (D) Only (iii)

14. In the derivation of Thiem's formula, Q = 2πT (S1 - S2)/[2.3 log10(r₂/r₁)] the following assumption is not applicable
    (A) The aquifer is homogeneous and isotropic
    (B) Flow lines are radial and horizontal
    (C) The slope of the water surface is too small
    (D) The well has been sunk up to the surface of the unconfined aquifer

15. The peak of a 4 hour flood hydrograph is 240 m3/sec. If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, peak of 4hours unit hydrograph will be
    (A) 20 m3/sec
    (B) 25 m3/sec
    (C) 30 m3/sec
    (D) 35 m3/sec

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