MCQ
641. The run off a drainage basin is
Initial recharge + ground water accretion + precipitation
Precipitation ground water accretion + initial recharge
Precipitation ground water accretion + initial recharge
Precipitation ground water accretion – initial recharge
642. Infiltration capacity of soil depends upon
Number of voids present in the soil
Shape and size of soil particles
Arrangement of soil particles
All the above
643. If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as
0.10 m
0.20 m
0.5 m
1.0 m
644. The main cause of meandering is
Presence of an excessive bed slope in the river
Degradation
The extra turbulence generated by the excess of river sediment during floods
None of the above
645. The critical depth in a channel can be produced
By raising the bottom of the channel
By lowering the bottom of the channel
By decreasing the width of the channel
Both (a) and (c) of above
646. From the data of the rain storm shown in the below figure, the value of Windex is
1.5 cm/hour
2 cm/hour
2.5 cm/hour
3 cm/hour
647. Which of the following spillways is least suitable for an earthen dam?
Ogee spillway
Chute spillway
Side channel spillway
Shaft spillway
648. Which of the following can be used as a meter fall?
Vertical drop fall
Flumed glacis fall
Unflumed glacis fall
All of the above
649. Pick up the correct statement from the following:
Absolute humidity at a given temperature is equal to weight of moisture present in a unit volume.
Relative humidity is the ratio of actual vapour pressure and saturation vapour pressure at the same temperature.
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.
All the above
650. Horizontal acceleration due to earthquake results in
Hydrodynamic pressure
Inertia force into the body of the dan
Both (A) and (B)
None of the above
651. To determine the discharge at a section in a stream from its rating curve, the required data are (1) Slope of water surface at the section (ii) Stage at the section (ii) Current meter readings at the section The correct answer is
(i) and (ii)
(ii) and (ii)
Only (ii)
Only (iii)
652. Interception losses are due to (i) Evaporation (ii) Transpiration (iii) Stream flow The correct answer is
Only (i)
(i) and (ii)
(ii) and (iii)
(i), (ii) and (iii)
653. the exit gradient in the absence of a downstream cut-off is
Unity
Infinity
Very large
654. Water contains
One hydrogen atom and one oxygen atom
Two hydrogen atoms and one oxygen atom
One hydrogen atom and two oxygen atoms
Three hydrogen atoms
655. The net speed under which the turbine reaches its peak efficiency is called
Design speed
Rated speed
Gross speed
Operating speed
656. Instantaneous unit hydrograph is a hydrograph of (i) Unit duration (ii) Unit rainfall excess (iii) Infinitely small duration (iv) Infinitely small rainfall excess The correct answer is
(i) and (ii)
(i) and (iv)
(ii) and (iii)
(iii) and (iv)
657. For wave action in dams, the maximum height of freeboard is generally taken to be equal to
0.5 hw
0.75 hw
1.25 hw
1.50 hw
658. The quantity of water retained by the sub-soil against gravity, is known
Yield
Porosity
Specific yield
Specific retention
659. Pick up the correct statement from the following:
The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity
Water retained by the interstices due to molecular attraction, is called pellicular water
Sum of the percentage of specific yield and specific retention is 100
All the above
660. In India the recording type rain gauge generally used, is-
Weighing type
Tipping type
Float recording type
None of these