Assistant Soil Conservation Engineer • Paper-II
Multi stage centrifugal pumps are used to:
A)
give high discharge
B)
produce high heads
C)
pump viscous fluids
D)
all of these
Multistage centrifugal pumps are used primarily to develop high heads.
Assistant Soil Conservation Engineer • Paper-II
The dimension of transmissibility T is:
A)
L2/T
B)
L3T2
C)
L/T2
D)
dimensionless
Transmissivity has dimensions L²/T.
Assistant Soil Conservation Engineer • Paper-II
In one-dimensional flow in an unconfined aquifer between two water bodies, when there is a recharge, the water profile is:
A)
a parabola
B)
part of an ellipse
C)
a straight line
D)
an arc of a circle
With uniform recharge in a one-dimensional unconfined aquifer, the water table profile is parabolic.
Assistant Soil Conservation Engineer • Paper-II
An aquifer confined at the bottom but not at the top is called:
A)
semiconfined aquifer
B)
unconfined aquifer
C)
confined aquifer
D)
perched aquifer
An aquifer confined below but open above is unconfined.
Assistant Soil Conservation Engineer • Paper-II
If pressure at a point is same in all directions for a fluid in motion, then the fluid is:
A)
a real fluid
B)
a Newtonian fluid
C)
an ideal fluid
D)
a Non-Newtonian fluid
An ideal fluid is inviscid and can have isotropic normal pressure.
Assistant Soil Conservation Engineer • Paper-II
What is the height of wave which is likely to be generated by a wind of 80 km/hr in a reservoir having a fetch of 50 km?
A)
0.5 m
B)
1.0 m
C)
2.0 m
D)
3.0 m
The estimated wave height for the stated wind/fetch is about 3 m.
Assistant Soil Conservation Engineer • Paper-II
The Penmann’s evapo-transpiration equation is based on:
A)
water budget method
B)
energy balance method
C)
mass transfer method
D)
energy balance and mass transfer
Penman’s equation combines energy-balance and aerodynamic mass-transfer terms.
Assistant Soil Conservation Engineer • Paper-II
Which of the salt present in water is harmful for cultivation purposes?
A)
sodium carbonate
B)
potassium sulphate
C)
calcium sulphate
D)
none of these
Sodium carbonate is harmful to cultivation because it promotes alkalinity/sodicity.
Assistant Soil Conservation Engineer • Paper-II
For closed growing crops (such as wheat), the method of irrigation used is:
A)
free flooding
B)
border flooding
C)
check flooding
D)
basin flooding
Border flooding suits closely spaced/closed-growing crops such as wheat.
Assistant Soil Conservation Engineer • Paper-II
The most common cause of acidity in water is:
A)
carbon monoxide
B)
nitrogen
C)
hydrogen
D)
carbon dioxide
Carbon dioxide dissolves to form carbonic acid and is the common source of acidity.
Assistant Soil Conservation Engineer • Paper-II
Total Kjeldahl nitrogen is a measure of:
A)
total organic nitrogen
B)
total organic and ammonia nitrogen
C)
total ammonia nitrogen
D)
total inorganic and ammonia nitrogen
TKN = organic nitrogen + ammonia nitrogen.
Assistant Soil Conservation Engineer • Paper-II
The ultimate BOD value of a waste:
A)
increases with temperature
B)
decreases with temperature
C)
remains the same at all temperatures
D)
doubles with every 10ºC rise in temperature
Ultimate BOD is not doubled with temperature; temperature mainly affects the rate of oxidation.
Assistant Soil Conservation Engineer • Paper-II
The Muskingham method of flood routing is a:
A)
form of hydraulic routing of a flood
B)
form of reservoir routing
C)
complete numerical solution of St. Venant equations
D)
hydrological channel routing method
Muskingum is a hydrological channel-routing method.
Assistant Soil Conservation Engineer • Paper-II
For large cities, the suitable method for forecasting population is:
A)
arithmetical increase method
B)
graphical method
C)
geometrical increase method
D)
comparative method
Geometrical increase is commonly used for large, rapidly growing cities in this exam convention.
Assistant Soil Conservation Engineer • Paper-II
In a siphon aqueduct, the worst condition of uplift on the floor occurs when:
A)
the canal is full and the drainage is empty, with water table at drainage bed level
B)
the canal is empty and the drainage is full, with water table at drainage bed level
C)
both the canal and the drainage are full
D)
the canal is empty and the drainage is full, with water table below the floor
The worst uplift occurs when the canal is empty and the drainage is full.
Assistant Soil Conservation Engineer • Paper-II
A useful soil moisture for plant growth is:
A)
capillary water
B)
gravitational water
C)
hygroscopic water
D)
all of these
Capillary water is generally available to plant roots; gravitational water drains away and hygroscopic water is tightly held.
Assistant Soil Conservation Engineer • Paper-II
The amount of precipitation is measured by:
A)
rain gauge
B)
osmoscope
C)
turbiditimeter
D)
all of these
Precipitation is commonly measured with a rain gauge.
Assistant Soil Conservation Engineer • Paper-II
A Pelton wheel is:
A)
tangential flow impulse turbine
B)
inward flow impulse turbine
C)
outward flow impulse turbine
D)
inward flow reaction turbine
A Pelton wheel is a tangential-flow impulse turbine.
Assistant Soil Conservation Engineer • Paper-II
The flow ratio of a Francis turbine is defined as the ratio of the:
A)
velocity of flow at inlet to the theoretical jet velocity
B)
theoretical velocity of jet to the velocity of flow at inlet
C)
velocity of runner at inlet to the velocity of flow at inlet
D)
none of the above
Flow ratio is velocity of flow at inlet divided by theoretical jet velocity.
Assistant Soil Conservation Engineer • Paper-II
In all reaction turbines, maximum efficiency is obtained if the:
A)
guide vane angle is 90º
B)
blade angle is 90º at the inlet
C)
blade angle is 90º at the outlet
D)
angle of the absolute velocity vector at the outlet is 90º
For maximum reaction-turbine efficiency, outlet whirl is ideally zero, making the absolute outlet velocity perpendicular to the tangent.
Assistant Soil Conservation Engineer • Paper-II
Sandy soils with good drainage become impermeable after prolonged use, if it is irrigated with a water containing __________ sodium.
A)
25%
B)
50%
C)
75%
D)
85%
The referenced irrigation-engineering answer key gives 85% sodium for this item.
Assistant Soil Conservation Engineer • Paper-II
Lining of a canal is necessary:
A)
to minimise the seepage loss in canal
B)
to prevent erosion of bed and sides due to high velocities
C)
to increase the discharge in canal section by increasing the velocity
D)
all of the above
Canal lining reduces seepage, erosion and can permit higher velocities/discharge, so all apply.
Assistant Soil Conservation Engineer • Paper-II
A wastewater sample has an initial BOD of 200 mg/L. The first order BOD decay coefficient is 0.5/ day. The BOD consumed (in mg/L) in 5 days is:
A)
150
B)
184
C)
30
D)
50
BOD consumed = 200(1−e^(−0.5×5))≈184 mg/L.
Assistant Soil Conservation Engineer • Paper-II
A rectangular open channel of width 4.5 m is carrying a discharge of 100 m3 /sec. The critical depth of the channel is:
A)
7.09 m
B)
3.69 m
C)
2.16 m
D)
1.31 m
For a rectangular channel, yc=(q²/g)^(1/3), with q=100/4.5≈22.22 m²/s, giving yc≈3.69 m.
Assistant Soil Conservation Engineer • Paper-II
The vertical wells provided along the banks of a river to draw ground water in dry season are called:
A)
open wells
B)
tube wells
C)
artesian wells
D)
infiltration wells
Infiltration wells are wells placed near river banks to draw infiltrated groundwater.
