ssc je previous year questions hydrology

Hydrology and Water Resources Engineering

Question No. 01

Generally the weir is aligned at right angles to the direction of the main river current because 

(A) It ensures less length of the weir 

(B) It gives better discharging capacity 

(C) It is economical 

(D) All of the above 

Answer: Option D 

Question No. 02

A straight glacis type fall with a baffle platform and a baffle wall is called 

(A) Vertical drop-fall 

(B) Glacis fall 

(C) Montague type fall 

(D) Inglis fall 

Answer: Option D 

Question No. 03

The meander pattern of a river is developed by 

(A) Average discharge 

(B) Dominant discharge 

(C) Maximum discharge 

(D) Critical discharge 

Answer: Option B 

Question No. 04

The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero 

will be equal to 

(A) Load factor 

(B) Plant factor 

(C) Utilisation factor 

(D) Both (A) and (B) 

Answer: Option D 

Question No. 05

The most suitable chemical which can be applied to the water surface for reducing evaporation is 

(A) Methyl alcohol 

(B) Ethyl alcohol 

(C) Cetyl alcohol 

(D) Butyl alcohol 

Answer: Option C 

Question No. 06

The shape of recession limb of a hydrograph depends upon 

(A) Basin characteristics only 

(B) Storm characteristics only 

(C) Both (A) and (B) 

(D) None of the above 

Answer: Option A 

Question No. 07

If the critical shear stress of a channel is XC, then the average value of shear stress required to 

move the grain on the bank is 

(A) 0.5 XC

(B) 0.75 TC 

(C) XC

(D) 1.33 TC

Answer: Option B 

Question No. 08

The flow of water after spilling over the weir crest in chute spillway and side channel spillway 

respectively are 

(A) At right angle and parallel to weir crest 

(B) Parallel and at right angle to weir crest 

(C) Parallel to weir crest in both 

(D) At right angle to weir crest in both 

Answer: Option A 

Question No. 09

Hydrodynamic pressure due to earthquake acts at a height of 

(A) 3H/4 above the base 

(B) 3H/4 below the water surface 

(C) 4H/3 above the base 

(D) 4H below the water surface, where H is the depth of water. 

Answer: Option C 

Question No. 10

Select the correct statement. 

(A) A meander increases the river length but a cut off reduces the river length 

(B) A cut-off increases the river length but a meander reduces the river length 

(C) Both meander and cut-off increase the river length 

(D) Both meander and cut-off decrease the river length 

Answer: Option A 

Question No. 11

Select the incorrect statement. 

(A) Intensive irrigation should be avoided in areas susceptible to water logging 

(B) Extensive irrigation should be adopted in areas susceptible to water logging 

(C) Lift irrigation increases water logging 

(D) All of the above 

Answer: Option C 

Question No. 12

In India, which of the following is adopted as standard recording rain-gauge? 

(A) -gauge 

(B) Tipping bucket type 

(C) Natural syphon type 

(D) Weighing bucket type 

Answer: Option C 

Question No. 13

The flow-mass curve is graphical representation of 

(A) Cumulative discharge and time 

(B) Discharge and percentage probability of flow being equalled or exceeded 

(C) Cumulative discharge, volume and time in chronological order 

(D) Discharge and time in chronological order 

Answer: Option C 

Question No. 14

Main purpose of mean water training for rivers is 

(A) Flood control 

(B) To provide sufficient depth of water in navigable channels, during low water periods 

(C) To preserve the channel in good shape by efficient disposal of suspended and bed load 

(D) All of the above 

Answer: Option C 

Question No. 15

A divide wall is provided 

(A) At right angle to the axis of weir 

(B) Parallel to the axis of weir and upstream of it 

(C) Parallel to the axis of weir and downstream of it 

(D) At an inclination to the axis of weir 

Answer: Option A 

Question No. 16

Isohyets are the imaginary lines joining the points of equal 

(A) Pressure 

(B) Height 

(C) Humidity 

(D) Rainfall 

Answer: Option D 

Question No. 17

As per lacey's theory silt factor is

(A) Directly proportional to average particle size 

(B) Inversely proportional to average particle size 

(C) Directly proportional to square root of average particle size 

(D) Not related to average particle size 

Answer: Option C 

Question No. 18

The time required by rain water to reach the outlet of drainage basin, is generally called 

(A) Time of concentration 

(B) Time of overland flow 

(C) Concentration time of overland flow 

(D) Duration of the rainfall 

Answer: Option A 

Question No. 19

Which of the following is a flexible outlet? 

(A) Submerged pipe outlet 

(B) kennedy's gauge outlet 

(C) gibs outlet

(D) None of the above 

Answer: Option B 

Question No. 20

Pick up the correct statement from the following: 

(A) The specified duration of unit hydrograph, is called unit duration 

(B) The rain during specified duration, is called unit storm 

(C) The number of unit hydrographs for a given basin, is theoretically infinite 

(D) All the above 

Answer: Option D 

Question No. 21

The drainage water intercepting the canal can be disposed of by passing the canal below the 

drainage in 

(A) Aqueduct and syphon aqueduct 

(B) Aqueduct and super passage 

(C) Super passage and canal syphon 

(D) Level crossing 

Answer: Option C 

Question No. 22

River training for depth is achieved by 

(A) Groynes 

(B) Construction of dykes or leaves 

(C) Both (A) and (B) 

(D) Groynes and bandalling 

Answer: Option D 

Question No. 23

Pick up the correct statement from the following: 

(A) A confined bed of impervious material laid over an aquifer, is known as an aquiclude 

(B) The top most water bearing strata having no aquifer, is known as non-artesian aquifer 

(C) The ordinary gravity wells which supply water from the top most water bearing strata, are 

called water table wells 

(D) All the above 

Answer: Option D 

Question No. 24

The rate of rainfall for successive 10 minute periods of a 60 minute duration storm, are shown in 

the below figure. If the value of index is 3 cm/hour, the runoff will be 

(A) 2 cm 

(B) 3 cm 

(C) 4 cm 

(D) 5 cm 

Answer: Option B 

Question No. 25

A land is known as waterlogged 

(A) When the permanent wilting point is reached 

(B) When gravity drainage has ceased 

(C) Capillary fringe reaches the root zone of plants 

(D) None of the above 

Answer: Option C 

Question No. 26

Boston society of Civil Engineer's formula Q = 0.0056 × (D/t) in cumecs/square km is based upon 

(A) Rainfall and drainage area 

(B) Total run off and drainage area 

(C) Drainage area and its shape 

(D) Drainage area 

Answer: Option B 

Question No. 27

A hyetograph is a graphical representation of 

(A) Rainfall intensity and time 

(B) Rainfall depth and time 

(C) Discharge and time 

(D) Cumulative rainfall and time 

Answer: Option A 

Question No. 28

Pick up the correct statement from the following: 

(A) Hydrograph is a plot of discharge and time 

(B) In hydrographs, time is plotted on X-axis 

(C) The maximum flow in the river due to rainfall, is called peak flow 

(D) All the above 

Answer: Option D 

Question No. 29

Which of the following methods is used to estimate flood discharge based on high water marks 

left over in the past? 

(A) Slope-area method 

(B) Area-velocity method 

(C) Moving boat method 

(D) Ultrasonic method 

Answer: Option A 

Question No. 30

If the dew point is greater than 0°C 

(A) Dew will be formed 

(B) Frost will be formed 

(C) Vapours will be formed 

(D) None of these 

Answer: Option A 

Question No. 31

For a catchment area of 120 km², the equilibrium discharge in m3/hour of a Scurve obtained by 

the summation of 6 hour unit hydro graph is 

(A) 0.2 × 106 

(B) 0.6 × 106

(C) 2.4 × 106

(D) 7.2 × 10

Answer: Option A 

Question No. 32

The specifications of most commonly used standard gauges in India, are 

(A) 200 sq. cm collector and 4 litres bottle 

(B) 100 sq. cm collector and 2 litres bottle 

(C) 200 sq. cm collector and 10 litres bottle 

(D) 100 sq. cm collector and 4 litres bottle 

Answer: Option A 

Question No. 33

For an annual flood series arranged in descending order of magnitude, the return for a magnitude Listed at position period m  in a total is 

(A) N/(m + l) 

(B) m/(N + l) 

(C) m/N

(D) (N + l)/m

Answer: Option D 

Question No. 34

A control meter is preferred to a weir because 

(A) It measures the discharge even in silt Leiden streams 

(B) The velocity of approach of the channel increases above the control, and thus removes the 

silt completely 

(C) It is not damaged by floating debris 

(D) All the above 

Answer: Option D 

Question No. 35

The uplift pressure on the face of a drainage gallery in a dam is taken as 

(A) Hydrostatic pressure at toe 

(B) Average of hydrostatic pressure at toe and heel 

(C) Two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel 

(D) None of the above 

Answer: Option C 

Question No. 36

The elevation Z of the watershed is: (where letters carry their usual meanings) 

(A) Reduced level of the top most point of the basin 

(B) Reduced level of the lower most point of the basin 

(C) Average elevation of the highest and lowest point of the drainage basin 

(D) Obtained by the formula Z =a1z1 +a2z2 + + anzn)/A

Answer: Option D 

Question No. 37

As compared to gravity dams, earthen dams 

(A) Are costlier 

(B) Are less susceptible to failure 

(C) Require sound rock foundations 

(D) Require less skilled labour 

Answer: Option D 

Question No. 38

The radius of influence is 

(A) Radius of the main well 

(B) Distance from the wall of main well to the point of zero draw down 

(C) Distance from the centre of main well to the point of zero draw down 

(D) None of these 

Answer: Option C 

Question No. 39

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

(A) Straight drop spillway 

(B) Shaft spillway 

(C) Chute spillway 

(D) Ogee spillway 

Answer: Option B 

Question No. 40

Dickens formula for high flood estimate, is useful only for the catchments in 

(A) Southern India 

(B) Northern India 

(C) Eastern India 

(D) Western India 

Answer: Option B 

Question No. 41

Silt excluders are constructed on the 

(A) River bed upstream of head regulator 

(B) River bed downstream of head regulator 

(C) Canal bed upstream of head regulator 

(D) Canal bed downstream of head regulator 

Answer: Option A 

Question No. 42

Pick up the correct statement from the following: 

(A) Rivers, lakes, oceans and springs get water from the rains 

(B) Rain water is obtained by evaporation from rivers, lakes and oceans 

(C) Water remains in atmosphere as vapours 

(D) All the above 

Answer: Option D 

Question No. 43

For a proportional outlet, the flexibility is 

(A) Zero 

(B) Between zero and 1 

(C) 1 

(D) Greater than 1 

Answer: Option C 

Question No. 44

Pick up the correct statement from the following: 

(A) The portion of pellicular water which remains unutilised, is called hygroscopic water 

(B) The moisture content at which permanent wilting of plants takes place, is called the wilting 

point 

(C) The moisture deficiency will be different at different points 

(D) All the above 

Answer: Option D 

Question No. 45

The aqueduct or super-passage type of works are generally used when 

(A) High flood drainage discharge is small 

(B) High flood drainage discharge is large and short lived 

(C) High flood drainage discharge is large and continues for a long time 

(D) None of the above 

Answer: Option A 

Question No. 46

If a gauge is installed perpendicular to the slope, its measurement is reduced by multiplying 

(A) Sine of the angle of inclination with vertical 

(B) Cosine of the angle of inclination with vertical 

(C) Tangent of the angle of inclination with vertical 

(D) Calibration coefficient of the gauge 

Answer: Option B 

Question No. 47

A river training work is generally required when the river is 

(A) Aggrading type 

(B) Degrading type 

(C) Meandering type 

(D) Both (A) and (B) 

Answer: Option C 

Question No. 48

From the Survey of India map, the distance of the critical point is 20 km and difference in elevation 

is 193 m. The over land flow time, is 

(A) 2 hours 

(B) 3 hours 

(C) 2 hours and 30 minutes 

(D) 4 hours 

Answer: Option D 

Question No. 49

The maximum average depth due to one day storm over an area of 100 km² is 100 mm. Depth￾Area-Duration (DAD) curves indicate the same area of 100 km² the maximum average depth for a 

3 hour storm will be 

(A) 100 mm 

(B) More than 100 mm 

(C) Less than 100 mm 

(D) None of the above 

Answer: Option B 

Question No. 50

Pick up the correct statement from the following: 

(A) Perched aquifer is found in unconfined aquifer 

(B) The top surface of the water held in the perched aquifer, is known as perched water table 

(C) Perched aquifer is formed in unfined acquirer if an impervious layer exists 

(D) All the above 

Answer: Option D