Assistant Soil Conservation Engineer • Paper-II
The water obtained from the tube wells is known as:
A)
surface water
B)
sub-surface water
C)
run-off
D)
potable water
Water from tube wells is subsurface water.
Assistant Soil Conservation Engineer • Paper-II
The best method suitable for disposal of plastic and rubber waste is:
A)
composting
B)
incineration
C)
pyrolysis
D)
sanitary landfill
Incineration is the conventional disposal method among these choices for plastic/rubber waste.
Assistant Soil Conservation Engineer • Paper-II
Which one of the following can be used to check inconsistency of rainfall data?
A)
Normal ratio method
B)
Mass curve method
C)
Double mass curve method
D)
Depth duration frequency curve
The double-mass curve is used to check rainfall-record consistency.
Assistant Soil Conservation Engineer • Paper-II
A submerged pipe outlet is an example of:
A)
semi-modular outlet
B)
non-modular outlet
C)
rigid module
D)
adjustable proportional module
A submerged pipe outlet is non-modular because its discharge depends on downstream conditions.
Assistant Soil Conservation Engineer • Paper-II
Which of the following method id useful for obtaining values of flood discharges for a high recurrence interval?
A)
California method
B)
Hazen’s method
C)
Gumbel’s method
D)
all of these
Gumbel’s method is used for high-recurrence flood-frequency estimation.
Assistant Soil Conservation Engineer • Paper-II
The relation between duty (D) in hectares/cumec, delta (Δ) in metres and base period (B) in days is:
A)
Δ = 8.64B / D
B)
Δ = 86.4B / D
C)
Δ = 864B / D
D)
Δ = 8640B / D
The duty relation is Δ=8.64B/D.
Assistant Soil Conservation Engineer • Paper-II
The hydraulic efficiency of an impulse turbine is:
A)
ratio of actual power produced by the turbine to the energy supplied by the turbine
B)
ratio of actual work available at the turbine to the energy imparted to the wheel
C)
ratio of work done on the wheel to the energy of the jet
D)
none of the above
Hydraulic efficiency compares work done on the wheel with energy supplied by the jet.
Assistant Soil Conservation Engineer • Paper-II
Discharge of a centrifugal pump is:
A)
directly proportional to diameter of impeller
B)
inversely proportional to diameter of impeller
C)
directly proportional to square of diameter of impeller
D)
inversely proportional to square of diameter of impeller
For similar pumps at constant speed, Q scales approximately with D².
Assistant Soil Conservation Engineer • Paper-II
Suspended impurities consists of:
A)
iron
B)
chlorine
C)
bacteria
D)
all of these
Bacteria can occur as suspended impurities; chlorine is dissolved, not suspended.
Assistant Soil Conservation Engineer • Paper-II
The flow-mass curve is an integral curve of:
A)
the hydrograph
B)
the hyetograph
C)
the flow duration curve
D)
the S-curve
A flow-mass curve is the integral of the hydrograph.
Assistant Soil Conservation Engineer • Paper-II
A geological formation which is essentially impermeable for flow of water even though it may contain water in its pores is called:
A)
aquifer
B)
aquifuge
C)
aquitard
D)
aquiclude
An aquiclude can contain water in pores but is essentially impermeable to flow.
Assistant Soil Conservation Engineer • Paper-II
In the model of a highway bridge constructed to a scale of 1:25, the force of water on the pier was measures to be 1 kg. The force on the prototype pier will be:
A)
15003 kg
B)
15245 kg
C)
15625 kg
D)
15833 kg
With geometric scale 1:25 and Froude similarity, force scale is λ³=25³=15,625.
Assistant Soil Conservation Engineer • Paper-II
The double mass curve technique is used:
A)
to find average rainfall over a number of years
B)
to estimate the missing rainfall data
C)
to check the consistency of rain gauge records
D)
to find the minimum number of rain gauges required in a basin
Double-mass curves test consistency of rain-gauge records.
Assistant Soil Conservation Engineer • Paper-II
Annual runoff volume of 116.8 Mm3 from a catchment of area 180 km2 represents an annual runoff depth of:
A)
649 cm
B)
6.49 cm
C)
64.9 cm
D)
6.49 m
116.8 million m³ over 180 km² gives 0.6489 m = 64.9 cm runoff depth.
Assistant Soil Conservation Engineer • Paper-II
In a Lacey regime channel, consider the following statements: 1. The bed load is zero. 2. The suspended load is zero. 3. The bed slope is a function of the full supply discharge and the silt size. Which of the above statements is/are correct?
A)
1 and 2
B)
3 only
C)
2 and 3
D)
2 only
In Lacey regime theory, the bed slope relation depends on discharge and silt size; the bed/suspended load is not zero, so statement 3 only is correct.
Assistant Soil Conservation Engineer • Paper-II
A plot between rainfall intensity vs time is called as:
A)
hydrograph
B)
mass curve
C)
hyetograph
D)
isohyet
Rainfall intensity versus time is a hyetograph.
Assistant Soil Conservation Engineer • Paper-II
The area between the two isohyetes 40 cm and 50 cm is 100 km2 , and that between 50 cm and 60 cm is 150 km2 . What is the average depth of annual precipitation over the basin of 250 km2?
A)
50 cm
B)
51 cm
C)
52 cm
D)
60 cm
Weighted basin rainfall is (45×100+55×150)/250=51 cm.
Assistant Soil Conservation Engineer • Paper-II
The probability of a 10 year flood to occur at least once in the next 4 years is:
A)
45%
B)
35%
C)
30%
D)
20%
1−0.9^4≈0.344, about 35%.
Assistant Soil Conservation Engineer • Paper-II
The jet ratio is defined as the ratio of:
A)
diameter of jet to the diameter of Pelton wheel
B)
velocity of jet to the velocity of Pelton wheel
C)
diameter of Pelton wheel to the diameter of jet
D)
velocity of Pelton wheel to the velocity of jet
Jet ratio = wheel diameter / jet diameter.
Assistant Soil Conservation Engineer • Paper-II
The volume of water below the minimum pool level in a reservoir is known as:
A)
useful storage
B)
surcharge storage
C)
dead storage
D)
bank storage
Water below minimum pool level is dead storage.
Assistant Soil Conservation Engineer • Paper-II
The dimension of the storage coefficient S is:
A)
L3
B)
LT-1
C)
L3/T
D)
dimensionless
Storage coefficient is dimensionless.
Assistant Soil Conservation Engineer • Paper-II
The surface joining the static water levels in several wells penetrating a confined aquifer represents:
A)
water table surface
B)
capillary fringe
C)
piezometric surface of the aquifer
D)
cone of depression
The surface joining static levels in confined wells is the piezometric surface.
Assistant Soil Conservation Engineer • Paper-II
In a reciprocating pump, air vessels are used to:
A)
smoothen the flow
B)
reduce suction head
C)
increase delivery head
D)
reduce acceleration head
Air vessels in reciprocating pumps smooth the flow and reduce acceleration head; D is the intended single answer here.
Assistant Soil Conservation Engineer • Paper-II
The specific speed of a centrifugal pump is given by:
A)
N sqrt(Q) / H^(2/3)
B)
N sqrt(Q) / H^(3/4)
C)
N Q / H
D)
N Q / H^(5/4)
Ns=N√Q/H^(3/4).
Assistant Soil Conservation Engineer • Paper-II
Critical depth at a section of a rectangular channel is 1.5 m. The specific energy at that section is:
A)
0.75 m
B)
1.0 m
C)
1.5 m
D)
2.25 m
At critical depth in a rectangular channel, specific energy is 3yc/2 = 2.25 m.
