Assistant Professor / Lecturer • Paper-III
For 100 sq.m cement concrete (1:2:4) 4 cm thick floor, the quantity of cement required is
A)
0.90 m3
B)
0.94 m3
C)
0.98 m3
D)
1.0 m3
4cm thick: vol=4m³, dry vol ~1.54*4=6.16; cement=6.16/7=0.88≈0.90m³.
Assistant Professor / Lecturer • Paper-III
On the recommendations of IRC, the ruling gradient in mountainous terrain
A)
1 in 20
B)
1 in 30
C)
1 in 40
D)
1 in 25
IRC ruling gradient: plain 1 in 30 (3.3%), mountainous 1 in 20 (5%), steep 1 in 16.7.
Assistant Professor / Lecturer • Paper-III
Terzaghi equation of ultimate bearing capacity for strip footing may be used for square footing resting on pure clay soil with correction factor
A)
0.4
B)
0.6
C)
1.2
D)
1.3
Strip to square in clay: q_ult square =1.3 * q_strip ≈ factor 1.3 for cohesion term.
Assistant Professor / Lecturer • Paper-III
The thickness of bituminous carpet varies from
A)
50 to 75 mm
B)
75 to 100mm
C)
20 to 25mm
D)
100 to 120mm
Bituminous carpet surfacing is thin 20-25mm; 50-75mm is for bituminous concrete.
Assistant Professor / Lecturer • Paper-III
Quick sand is
A)
a type of sand
B)
a condition in which a cohesive soil loses its strength
C)
a condition in which a cohesion less soil, its strength because of upward flow of water.
D)
None of these
Quick sand is condition where upward seepage reduces effective stress to zero in cohesionless soil.
Assistant Professor / Lecturer • Paper-III
For the construction of highway(railway)
A)
longitudinal sections are required
B)
cross sections are required
C)
both longitudinal and cross sections are required
D)
none of these
Highway/railway design needs L-section for gradient and X-sections for earthwork.
Assistant Professor / Lecturer • Paper-III
Coulomb’s wedge theory assumes that
A)
back fill is dry, cohesionless, homogenous and isotropic
B)
slip surface is the plane which passes through the heel of the wall
C)
sliding wedge itself acts as a rigid body and the value of earth pressure is obtained by considering the limiting equilibrium of the wedge
D)
all the above
Coulomb theory assumes dry cohesionless homogeneous isotropic backfill, planar failure through heel, and rigid wedge equilibrium.
Assistant Professor / Lecturer • Paper-III
The weakest bond in soil is
A)
Hydrogen bond
B)
Covalend bond
C)
Secondary valence bond
D)
Tertiary bond
Secondary valence (van der Waals) bonds are weakest; covalent strongest.
Assistant Professor / Lecturer • Paper-III
Track construction involves preparation of
A)
subgrade
B)
plate laying
C)
ballasting
D)
All of the above
Track construction includes subgrade preparation, plate laying (rails/sleepers), and ballasting.
Assistant Professor / Lecturer • Paper-III
Site order book is used for recording
A)
instructions by the executive engineers
B)
construction measurements
C)
issue of store equipments
D)
names of the casual labour
Site order book records instructions/orders issued by Executive Engineer/supervising officer to contractor.
Assistant Professor / Lecturer • Paper-III
The height of the pilot’s eye above the runway surface is assumed
A)
1m
B)
3m
C)
4m
D)
5m
ICAO assumes pilot eye 3m above runway for visibility calculations.
Assistant Professor / Lecturer • Paper-III
Grade compensation is not necessary for gradients flatter than
A)
1%
B)
5.5%
C)
3%
D)
4%
IRC: grade compensation not needed if gradient flatter than 4%.
Assistant Professor / Lecturer • Paper-III
If is the angle of deflection of a simple curve of radius R, the length of the curve is:
A)
R πΔ / 90
B)
R πΔ / 180
C)
R πΔ / 270
D)
R πΔ / 360
Length = R*Δ(rad)=R*πΔ/180 when Δ in degrees.
Assistant Professor / Lecturer • Paper-III
Using Mohr’s diagram, the relation between major principle stress, σ1 and minor principal stress, σ3 and shear parameter (C) and φ is given by σ1 = σ3Nφ + 2C Nφ where Nφ is equal to
A)
(1 + sin φ) / sin φ
B)
(1 - sin φ) / sin φ
C)
(1 - sin φ) / (1 + sin φ)
D)
(1 + sin φ) / (1 - sin φ)
Nφ = tan²(45+φ/2) = (1+sinφ)/(1-sinφ).
Assistant Professor / Lecturer • Paper-III
Cross staff is used for
A)
setting out right angles
B)
measuring contour gradient
C)
taking levels
D)
measuring distances
Cross staff / open cross staff is used to set perpendicular offsets / right angles.
Assistant Professor / Lecturer • Paper-III
Shaft provides
A)
Ventilation
B)
Work front
C)
transfer centre line to inside the tunnel
D)
All of the above
Shaft in tunnel gives ventilation, additional work fronts, and transfers alignment inside.
Assistant Professor / Lecturer • Paper-III
If V is the design speed of vehicles in km/hr, the change of radial acceleration in metre/sec3
A)
(V+65)/70
B)
(V+70)/60
C)
(V+80)/75
D)
(V+80)/60
IRC max rate of change C = 80/(75+V) m/s³; option C has numbers 80 and 75, so (V+80)/75 likely typo for 80/(75+V).
Assistant Professor / Lecturer • Paper-III
Co-efficient of permeability of soil varies approximately as
A)
D2/10
B)
D10
C)
D2/3/10
D)
D3/10
Hazen formula k = C*D10²; permeability ∝ effective size D10 squared (≈ D²/10)
Assistant Professor / Lecturer • Paper-III
The curve composed of two arcs of different radii having their centres on the opposite side of the curve, is known
A)
a reverse curve
B)
a compound curve
C)
a simple curve
D)
a vertical curve
Reverse curve uses two arcs opposite sides of common tangent; compound same side.
Assistant Professor / Lecturer • Paper-III
The method of draining in the tunnels is generally known as:
A)
pre- drainage
B)
dewatering
C)
permanent drainage
D)
all of the above
Tunnel drainage includes pre-drainage, dewatering during construction, and permanent drainage systems.
Assistant Professor / Lecturer • Paper-III
If the whole Circle Bearing of a line is 2700, its reduced bearing is
A)
N900W
B)
N900
C)
W900
D)
N900S
WCB 270° = due West; RB = S90°W or W90°; listed as W900 (West 90°).
Assistant Professor / Lecturer • Paper-III
Offsets are
A)
lateral measurements made with respect to main survey lines
B)
perpendiculars erected from chain lines
C)
taken to avoid unnecessary walking between stations
D)
all of these
Offsets are lateral measurements from chain line to detail, often perpendicular, to avoid extra traversing.
Assistant Professor / Lecturer • Paper-III
A 30m metric chain is found to be 0.1m short throughout the measurement. If the distance measured is recorded as 300m, then the actual distance measured will be
A)
200 m
B)
299 m
C)
300
D)
301 m
Actual length = nominal recorded * (actual chain / nominal) = (300/30)*29.9 = 299m.
Assistant Professor / Lecturer • Paper-III
Scour occurs when
A)
Velocity of the stream exceeds than limiting velocity
B)
Velocity of the stream is lower than limiting velocity
C)
Velocity of the stream is equal to limiting velocity
D)
All the above
Scour initiates when actual velocity exceeds critical/limiting velocity that can move bed particles.
Assistant Professor / Lecturer • Paper-III
Plasticity Index is
A)
LL- PL
B)
LL+ PL
C)
LL- SL
D)
PL- LL
PI = Liquid Limit - Plastic Limit.
