Assistant Soil Conservation Engineer • Paper-II
In a water treatment plant, dissolved iron and manganese can be removed from the water by:
A)
aeration
B)
aeration and coagulation
C)
aeration and flocculation
D)
aeration and sedimentation
Aeration oxidizes dissolved iron and manganese so they can be removed.
Assistant Soil Conservation Engineer • Paper-II
Which of the following factors are non-dimensional?
A)
C in Chezy’s equation
B)
V/sqrt(gL) used in estimating wave making drag
C)
N2D2/Q2 employed in comparing performance of pumps
D)
D5 employed in computations in pipe networks
V/√(gL) is the Froude number and is dimensionless.
Assistant Soil Conservation Engineer • Paper-II
An isohyet is a line joining points having:
A)
equal evaporation value
B)
equal barometric pressure
C)
equal height above MSL
D)
equal rainfall depth in a given duration
An isohyet joins points of equal rainfall depth for a specified period.
Assistant Soil Conservation Engineer • Paper-II
Consumptive use of water by a crop is equal to:
A)
the depth of water consumed by evaporation
B)
the depth of water consumed by transpiration
C)
the depth of water consumed by evaporation and transpiration during crop growth, including water consumed by accompanying weed growth
D)
none of the above
Consumptive use is essentially evapotranspiration, including associated weed use in the stated definition.
Assistant Soil Conservation Engineer • Paper-II
The volume of water that can be extracted by force of gravity from a unit volume of aquifer material is called:
A)
specific retention
B)
specific yield
C)
specific storage
D)
specific capacity
Specific yield is the gravity-drainable water per unit aquifer volume.
Assistant Soil Conservation Engineer • Paper-II
Which of the following pump is successfully used for lifting water from deep wells?
A)
centrifugal pump
B)
reciprocating pump
C)
jet pump
D)
air lift pump
Jet pumps are suitable for lifting water from deep wells.
Assistant Soil Conservation Engineer • Paper-II
Which one of the following factors has the maximum effect on figure of per capita demand of water supply of a given town?
A)
method of charging of the consumption
B)
quality of water
C)
system of supply-intermittent or continuous
D)
industrial demand
Among the listed factors, the method of charging consumption has the maximum effect on per-capita demand in the referenced water-supply exam material.
Assistant Soil Conservation Engineer • Paper-II
A commonly used handpump is:
A)
centrifugal pump
B)
reciprocating pump
C)
rotary pump
D)
axial flow pump
A common handpump is a reciprocating pump.
Assistant Soil Conservation Engineer • Paper-II
The shape of recession limb of a hydrograph depends upon:
A)
basin characteristics only
B)
storm characteristics only
C)
both (a) & (b)
D)
none of the above
The recession limb is chiefly governed by catchment/storage characteristics.
Assistant Soil Conservation Engineer • Paper-II
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 of the above
Infiltration depends on voids, particle size/shape and arrangement, so all are relevant.
Assistant Soil Conservation Engineer • Paper-II
What is the regime scour depth for a channel in soil with silt factor of unity and carrying 8 m2 /s of discharge intensity in accordance with Lacey’s regime theory?
A)
3.6 m
B)
4 m
C)
5.4 m
D)
25.6 m
The referenced Lacey-regime solution gives 5.4 m for q=8 m²/s and f=1.
Assistant Soil Conservation Engineer • Paper-II
Consider the following objectives for river training: 1. high flood discharge may pass safely through the reach; 2. sediment load (including bed and suspended load) may be transported efficiently; 3. by making the river course unstable whereby to increase bank erosion. Select the correct answer using the codes given below:
A)
1, 2 and 3
B)
1 and 2
C)
2 and 3
D)
1 and 3
Option B is correct: 1 and 2.
Assistant Soil Conservation Engineer • Paper-II
Uniformity coefficient of filter sand is given by:
A)
D60/D10
B)
D50/D10
C)
D60/D50
D)
D5/D10
Uniformity coefficient of filter sand is D60/D10.
Assistant Soil Conservation Engineer • Paper-II
The pH of water suitable for irrigation purpose is:
A)
between 3 and 6
B)
between 6 and 8.5
C)
between 8.5 and 11
D)
more than 11
Irrigation water is generally acceptable around pH 6–8.5.
Assistant Soil Conservation Engineer • Paper-II
Crop ratio is the ratio of area irrigated:
A)
in Rabi season to Kharif season
B)
in Kharif season to Rabi season
C)
under perennial crop to total crop
D)
under perennial crop to non-perennial crop
Crop ratio is perennial irrigated area divided by non-perennial irrigated area.
Assistant Soil Conservation Engineer • Paper-II
Zero hardness of water is achieved by:
A)
lime soda process
B)
excess lime treatment
C)
ion exchange treatment
D)
excess alum and lime treatment
Ion exchange can reduce hardness essentially to zero.
Assistant Soil Conservation Engineer • Paper-II
The concentration of OH- ion in a water sample is measured as 17 mg/L at 25ºC. What is the pH of the water sample?
A)
10
B)
11
C)
12
D)
13
[OH−]=10^−3 M gives pOH=3 and pH=11.
Assistant Soil Conservation Engineer • Paper-II
Which one of the following would contain water with the maximum amount of turbidity?
A)
rivers
B)
lakes
C)
oceans
D)
wells
Rivers generally have the highest turbidity among the listed sources.
Assistant Soil Conservation Engineer • Paper-II
The water shed canal is also called:
A)
side slope canal
B)
contour canal
C)
ridge canal
D)
all of these
A watershed canal follows the ridge/watershed line, hence it is a ridge canal.
Assistant Soil Conservation Engineer • Paper-II
The amount of water required to fill up the pore spaces in soil particles by replacing all air held in pore spaces, is known as:
A)
field capacity
B)
saturation capacity
C)
available moisture
D)
all of these
Saturation capacity is the water content when all pore air has been displaced.
Assistant Soil Conservation Engineer • Paper-II
A pump running at 1414 rpm delivers 256 lps of water against a head of 16 m. The pump is of the:
A)
normal speed radial type
B)
double section type
C)
mixed flow type
D)
axial flow type
The specific speed places this pump in the mixed-flow range.
Assistant Soil Conservation Engineer • Paper-II
The narrow strip of land left at the ground level between the inner toe of the bank and top edge of the cutting, is known as:
A)
free board
B)
dowel
C)
inspection roadway
D)
berm
The strip of land between the toe and cutting edge is a berm.
Assistant Soil Conservation Engineer • Paper-II
From ecological considerations, the minimum level of Dissolved Oxygen (DO) necessary in the rivers and streams is:
A)
1 mg/L
B)
2 mg/L
C)
4 mg/L
D)
8 mg/L
A minimum DO around 4 mg/L is the usual ecological benchmark used here.
Assistant Soil Conservation Engineer • Paper-II
The finely divided dispersion of solid particles which are not visible to the naked eye and cannot be removed by ordinary filters are known as:
A)
suspended impurities
B)
dissolved impurities
C)
colloidal impurities
D)
none of these
Very fine particles not removed by ordinary filtration are colloidal impurities.
Assistant Soil Conservation Engineer • Paper-II
The specific speed of a turbine under a head of 150 m to develop 2000 HP while running at 300 rpm is:
A)
10-35
B)
35-60
C)
60-300
D)
300-1000
The turbine specific speed falls in the 10–35 band.
