Assistant Professor / Lecturer • Paper-III
The permeability of a given soil is
A)
directly proportional to the average grain size
B)
directly proportional to the square of the average grain size
C)
inversely proportional to the square of the average grain size
D)
inverely proportional to the average grain size
k ∝ D² per Kozeny-Carman; permeability proportional to square of grain size.
Assistant Professor / Lecturer • Paper-III
Removal of parallax may be achieved by focusing
A)
the objective
B)
the eye piece
C)
the objective and the eye piece
D)
all the above
Parallax removed by focusing eyepiece for crosshairs and objective for image to coincide.
Assistant Professor / Lecturer • Paper-III
The factor of safety of the slope against sliding due to shear is given by
A)
τf / τ
B)
τ / (σ cos i)
C)
σz / (τ sin i)
D)
All of these
Factor of safety against shear = shear strength / shear stress = τf/τ.
Assistant Professor / Lecturer • Paper-III
During the mid day, the rigid pavement slab is
A)
warping down
B)
warping up
C)
crack
D)
none of these
At noon top is hotter than bottom, top expands → slab warps down (curls down at edges).
Assistant Professor / Lecturer • Paper-III
For night landing, the threshold are lighted
A)
green
B)
red
C)
white
D)
yellow
Threshold lights are green indicating runway start for night landing.
Assistant Professor / Lecturer • Paper-III
Allowable bearing pressure for a foundation depends upon
A)
Allowable settlement only
B)
ultimate bearing capacity of soil only
C)
both allowable settlement and ultimate bearing capacity
D)
None of these
Allowable pressure limited by both ultimate bearing capacity /FS and allowable settlement.
Assistant Professor / Lecturer • Paper-III
Extended breathing of the silica dust while tunneling causes a dangerous lungs disease known as
A)
Influenza
B)
Asthma
C)
Septicimia
D)
Silicosis
Prolonged inhalation of silica dust causes silicosis, a fibrotic lung disease common in tunneling.
Assistant Professor / Lecturer • Paper-III
For a comfortable travel on highways, the centrifugal ratio should not exceed
A)
0.15
B)
0.25
C)
0.20
D)
0.30
For comfort on highways max centrifugal ratio = 1/4 =0.25; railways 1/8=0.125.
Assistant Professor / Lecturer • Paper-III
On Indian railways standard length of rails for B.G track is
A)
12.8m
B)
10.97m
C)
11.89m
D)
10.06m
BG standard rail length 12.8m (42 ft), MG 11.89m; newer 13m/12m also exist.
Assistant Professor / Lecturer • Paper-III
The strip of land acquired and reserved for construction and future development of road is
A)
shoulder
B)
formation width
C)
right of way
D)
setback
Right of way is total land width acquired for road construction, including carriageway, shoulders and future widening.
Assistant Professor / Lecturer • Paper-III
For setting out right angles, the instrument used is
A)
Optical square
B)
Abney level
C)
Alidade
D)
Ceylon ghat tracer
Optical square uses prism to set 90°; cross staff also but optical is precise instrument listed.
Assistant Professor / Lecturer • Paper-III
The maximum and minimum particle size of sand as per IS, classification are
A)
4.75mm and 0.0075mm
B)
2.00mm and 0.06mm
C)
2.0mm and 0.075mm
D)
4.75mm and 0.6 mm
As per IS 1498 sand 4.75mm to 0.075mm; given option A shows 4.75mm and 0.0075mm presumably typo for 0.075mm, closest to IS. Strict IS lower is 0.075mm (option C uses 2.0mm upper for MIT).
Assistant Professor / Lecturer • Paper-III
Darcy’s law is valid only if
A)
the flow is laminar
B)
the flow is turbulent
C)
the flow is due to water
D)
the flow is intermittent
Darcy v=Ki valid for laminar flow (Re small) in saturated soils.
Assistant Professor / Lecturer • Paper-III
Due to change in price level, a revised estimate is prepared if the sanctioned estimate exceeds
A)
2.0%
B)
2.5%
C)
4%
D)
5%
Revised estimate prepared if sanctioned estimate exceeds 5% due to price rise.
Assistant Professor / Lecturer • Paper-III
Two contour lines, having the same elevation
A)
cannot cross each other
B)
can cross each other
C)
cannot unite together
D)
can unite together
Same-elevation contours cannot unite as one; different-elevation unite only at vertical cliff.
Assistant Professor / Lecturer • Paper-III
A soil sample has a unit weight of 1.9g/cc and water content of 12%. If the specific gravity of solids be 2.65, determine the dry density of soil
A)
1.696 g/cc
B)
1.926 g/cc
C)
1.770 g/cc
D)
1.56 g/cc
Dry density = bulk/(1+w)=1.9/(1+0.12)=1.696 g/cc.
Assistant Professor / Lecturer • Paper-III
Building houses along the routes of communications radiating from a human settlement is
A)
ribbon development
B)
economic development
C)
agriculture development
D)
social development
Linear development along transport routes radiating from settlement is ribbon development, leading to urban sprawl.
Assistant Professor / Lecturer • Paper-III
A scale of 1 inch =50ft is mentioned in the map, what is the corresponding equivalent scale?
A)
1 cm = 5 m
B)
1 cm = 10 m
C)
1 cm = 7 m
D)
1 cm = 6 m
1in=50ft=600in; RF=1/600; 1cm=600cm=6m, so 1cm=6m.
Assistant Professor / Lecturer • Paper-III
The runway orientation is made so that landing and take off are
A)
against the wind direction
B)
along the wind direction
C)
perpendicular to wind direction
D)
All of the above
Runway oriented into prevailing wind so takeoff/landing against wind for more lift.
Assistant Professor / Lecturer • Paper-III
Undisturbed soil samples are required for conducting
A)
Consolidation Test
B)
Hydrometer
C)
Shrinkage Limit Test
D)
Specific Gravity Test
Consolidation and shear strength tests need undisturbed samples to preserve in-situ structure.
Assistant Professor / Lecturer • Paper-III
Island is provided at
A)
intersection
B)
shoulder
C)
culvert
D)
retaining wall
Traffic island is provided at intersection to channelize traffic and refuge for pedestrians.
Assistant Professor / Lecturer • Paper-III
Consolidation time of a soil sample
A)
increase with a decrease in permeability
B)
increase with increase in compressibility
C)
increase with a decrease in unit weight of water
D)
None of these
t = Tv H²/Cv, Cv=k/(mv γw); lower k -> lower Cv -> longer time. Also higher mv increases time; option A is principal standard answer.
Assistant Professor / Lecturer • Paper-III
The three times estimates for the activities of the network shown in the figure are shown above their arrows, The earliest expected time for the event 4 is
A)
19
B)
14
C)
24
D)
All of the above
Without figure, estimated TE = (to+4tm+tp)/6 per activity then forward pass. Assumed earliest expected time for event 4 is 19 days. Figure missing, best guess 19.
Assistant Professor / Lecturer • Paper-III
In a shear box test, the failure plane is
A)
weakest plane
B)
horizontal plane
C)
vertical plane
D)
major principal plane
Shear box forces failure on horizontal mid-plane.
Assistant Professor / Lecturer • Paper-III
According to Rankine’s formula, the minimum depth of foundation
A)
h = (P/W) * ((1-sinφ)/(1+sinφ))
B)
h = (P/w) * ((1-sinφ)/(1+sinφ))
C)
h = (p/w) * ((1-sinφ)/(1+tanφ))
D)
h = (P/w) * ((1-tanφ)/(1+tanφ))
Rankine min depth D = (p/γ)*[(1-sinφ)/(1+sinφ)]^2; option B gives (P/w)*(1-sin)/(1+sin) closest (square omitted in print).
