Assistant Soil Conservation Engineer • Paper-II
A centrifugal pump gives maximum efficiency when its impeller blades are:
A)
bent forward
B)
bent backward
C)
straight
D)
wave shaped
Backward-curved impeller blades generally give the best centrifugal-pump efficiency/stability.
Assistant Soil Conservation Engineer • Paper-II
The presence of calcium and magnesium bi-carbonates in water causes:
A)
hardness
B)
turbidity
C)
changes in colour
D)
none of these
Calcium and magnesium bicarbonates cause hardness.
Assistant Soil Conservation Engineer • Paper-II
The total number of independent equations that form the Lacey’s regime theory is:
A)
2
B)
3
C)
4
D)
6
Lacey’s regime theory is represented by four independent equations.
Assistant Soil Conservation Engineer • Paper-II
The best estimate of runoff represented by 36 mm of runoff depth from a basin area 2400 km2 is:
A)
1000 cumec-days
B)
2400 cumec-days
C)
3600 cumec-days
D)
2000 cumec-days
36 mm over 2400 km² corresponds to 1000 cumec-days.
Assistant Soil Conservation Engineer • Paper-II
The most commonly used absorbent used in water and waste water treatment is:
A)
sand of grain size from 0.1 to 2 mm
B)
activated carbon granules of size 0.1 to 2 mm
C)
ordinary wood shavings of fine size
D)
coal tar
Activated carbon is the common adsorbent used for many water/wastewater contaminants.
Assistant Soil Conservation Engineer • Paper-II
A channel is said to be of most economical cross-section, if:
A)
it gives maximum discharge for a given cross-sectional area and bed slope
B)
it has maximum wetted perimeter
C)
it involves lesser excavation for the designed amount of discharge
D)
all of the above
An economical section gives maximum discharge for the specified area and slope; option A states this directly.
Assistant Soil Conservation Engineer • Paper-II
A single rapid test to determine the pollution status of river water is:
A)
biochemical oxygen demand
B)
chemical oxygen demand
C)
total organic solids
D)
dissolved oxygen
Dissolved oxygen can be measured quickly and is useful as a rapid pollution indicator.
Assistant Soil Conservation Engineer • Paper-II
By which one of the following, a small quantity of water may be lifted to a great height?
A)
hydraulic ram
B)
hydraulic crane
C)
hydraulic lift
D)
hydraulic coupling
A hydraulic ram can lift a small quantity of water to a relatively great height using water-hammer energy.
Assistant Soil Conservation Engineer • Paper-I
The window which projects outside a room of a building for admitting more light and air is known as
A)
Bay window
B)
Dormer window
C)
Lantern window
D)
Casement window
A bay window projects beyond the wall to admit more light and air.
Assistant Soil Conservation Engineer • Paper-I
The velocity of a body reaching the ground from a height of h, is
A)
2 gh
B)
gh
C)
√2gh
D)
2g h
From v²=u²+2gh with u=0, v=√(2gh).
Assistant Soil Conservation Engineer • Paper-I
The deformation of a spring produced by a unit load is called
A)
Stiffness
B)
Flexibility
C)
Influence coefficient
D)
Unit strain
Flexibility is deformation produced by a unit load.
Assistant Soil Conservation Engineer • Paper-I
To minimize the effect of differential settlement, the area of a footing should be design for
A)
Dead load only
B)
Dead load + live load
C)
Dead load + fraction of live load
D)
Live load + fraction of dead load
Designing on dead load plus a fraction of live load helps reduce sensitivity to differential settlement.
Assistant Soil Conservation Engineer • Paper-I
For a given shear force across a symmetrical I section, the intensity of shear stress is maximum at the
A)
Extreme fibres
B)
Centroid of section
C)
At the junction of flange and the web, but on the web
D)
At the junction of flange and the web, but on the flange
In an I-section, shear stress is highest in the web near the neutral axis/centroid.
Assistant Soil Conservation Engineer • Paper-I
If the permissible compressive and tensile stresses in a singly reinforce beam are 50 kg/cm2 and 1400 kg/cm2 respectively and modular ratio is 18, the percentage of area (Ast) of steel required for economic section is
A)
0.596 %
B)
0.696 %
C)
0.796 %
D)
0.596 %
For the economic singly reinforced section, the calculated steel percentage is about 0.696% (option C).
Assistant Soil Conservation Engineer • Paper-I
The shear force diagram of cantilever beam which is subjected to carrying uniformly distributed load over its length, is
A)
Triangle
B)
Rectangle
C)
Parabola
D)
Cubic parabola
For a cantilever under UDL, shear varies linearly, so the SFD is triangular.
Assistant Soil Conservation Engineer • Paper-I
The sound which continues even after its source is cut off is called
A)
Reverberation
B)
Hertz
C)
Interference
D)
Echo
Persistence of sound after the source stops is reverberation.
Assistant Soil Conservation Engineer • Paper-I
The “plane section remain plane” assumption in bending theory implies
A)
Strain profile is line
B)
Stress profile is linear
C)
Both strain and stress are linear
D)
Shear deformation are neglected
The plane-sections assumption gives a linear strain distribution.
Assistant Soil Conservation Engineer • Paper-I
The modulus of elasticity, E = 5000√fck where fck is the characteristic compressive strength of concrete, specified in IS 456:2000 is based on
A)
Tangent modulus
B)
Initial tangent modulus
C)
Secant modulus
D)
Chord modulus
The IS 456 expression for E is based on the secant modulus.
Assistant Soil Conservation Engineer • Paper-I
The specimen in a Charpy impact test is supported as
A)
Cantilever beam
B)
Simply supported beam
C)
Fixed beam
D)
Continuous beam
The Charpy specimen is simply supported during impact.
Assistant Soil Conservation Engineer • Paper-I
The principal of virtual work can be applied to elastic system considering the virtual work of
A)
Internal forces only
B)
External forces only
C)
Internal and external forces
D)
None
Virtual work for equilibrium involves internal and external virtual work.
Assistant Soil Conservation Engineer • Paper-I
In moment distribution method, the sum of distribution factors of all the member meeting at any joint is always
A)
Zero
B)
Less than 1
C)
1
D)
Greater than 1
Distribution factors at a joint sum to 1.
Assistant Soil Conservation Engineer • Paper-I
A fixed beam of uniform section is carrying a point load at its mid-span. If the moment of inertia of the middle half-length is now reduced to half its previous value, then the fixed end moment will
A)
Remain constant
B)
Decrease
C)
Increase
D)
Change their direction
The referenced structural-analysis solution gives increase: reducing the middle-half stiffness requires larger fixed-end moments to maintain zero support rotations.
Assistant Soil Conservation Engineer • Paper-I
The strain energy of a structure due to bending is given by
A)
∫ M2dx / EI
B)
∫ M2dx / 2EI
C)
∫ M2dx / 3EI
D)
∫ M2dx / 4EI
U_b=∫M²/(2EI)dx.
Assistant Soil Conservation Engineer • Paper-I
The number of simultaneous equations to be solved in slope deflection method is equal to
A)
Degree of static indeterminacy
B)
Degree of kinematic indeterminacy
C)
The number of joints in the structure
D)
Number of equilibrium conditions
Slope-deflection equations are set up for the unknown joint displacements/rotations, i.e. kinematic indeterminacy.
Assistant Soil Conservation Engineer • Paper-I
In simple harmonic motion, acceleration of a particle is proportional to
A)
Rate of change of velocity
B)
Displacement
C)
Velocity
D)
Direction
In SHM, acceleration is proportional to displacement and opposite in direction.
