The most popular method of construction of wall breakwaters is
Barge method
Staging method
Low level method
none of the above
Q.2.
Which of the following structures protects the shore by trapping of littoral drift?
groynes
sea walls
revetments
moles
Q.3.
The significant wave height is defined is the average height of the
one – third highest waves
one – fourth highest waves
one – fifth highest waves
one – tenth highest waves
Q.4.
Which of the following structures are constructed parallel to shore line to develop a demarcating line between land area and water area?
Sea walls, bulk heads and groynes
Sea walls, bulk heads and revetments
Sea walls, revetments and groynes
Bulk heads, revetments and groynes
Q.5.
The width of the entrances of the harbours is restricted to
100 m
125 m
150 m
180 m
Q.6.
In a wet dock system,
minimum required depth of water for the vessels is maintained
entrance locks are provided with massive gates
the locks of dock gate are operated by means of heavy bascule bridges and connected machinery
the cost of construction is quite heavy
E. all the above.
Q.7.
A roadstead :
is a protected area of water where boats can move safely
is the end of the road at the harbour
may be protected by break water walls
none of these.
Q.8.
For location of soundings a range and one angle from the shore involves the following operations. Which one is correct ?
A range line is established
The first and the last soundings and every tenth soundings are fixed by angular observations
The intermediate soundings are fixed by the time intervals
All the above.
Q.9.
If h and h1 are the heights of a light house and the observer in a ship in metres above M S L then the horizontal distance from the ship to the light house in kilometres is
3.86 (h + h1)
3.86 (h - h1)
3.86 (h x h1)
3.86 π (h + h1)
Q.10.
Soundings are required for
making nautical charts for navigation
ascertaining the areas subject to scour or silting
obtaining detailed information for construction
all the above.
Q.11.
Which one of the following lines is used for tying a ship with a dock
bow line
stern line
spring line
break line
E. all of these.
Q.12.
Surf zone is :
the fathom line of 10 m depth
the fathom line of 5 m depth
the swell of the sea breaking on the shore or reefs
the coast line attacked by the waves.
Q.13.
The dock wall is designed as a gravity retaining wall and is tested for
back fill pressure when the dock is empty
maximum water pressure from the dock without any back fill
the load charge transmitted to the dock by the movement of loaded vehicles or trains on the way
all of the above.
Q.14.
The shape of docks and basins is generally kept
rectangular ways
diamond shape quays
inclined quays
all of these.
Q.15.
The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively θ1 and θThe distances AB = L1 and BC = LFor calculating the angle α2 at C between the boat and station B is obtained by using the following formula: where (β is horizontal angle between A and C at B).
αt tan α2 = 360° - (θ1 + θ2 + β) = φ
all the above.
Q.16.
Due to the impact of water wave on a sea shore structure
hydrostatic pressure coupled with a strong momentary impact is caused
vibrations are subjected
internal pressure is developed
weakens the foundation
E. all of the above.
Q.17.
On a hydrographic map, the following feature is shown :
datum
high and low water lines
depth contours
land and water areas
E. all the above.
Q.18.
Pick up the incorrect statement from the following: In a dry dock block made of hard wood,
spacing of the blocks is 1.35 m
the lowest block is 1.8 m long 40 cm x 40 cm in cross-section
the middle block is 1.6 m long 40 cm x 40 cm in crosss-section
the top block is 1.2 m long 40 cm x 40 cm in cross-section
E. none of these.
Q.19.
A harbour is a place where
ships get shelter and protection against destructive forces due to sea waves
facilities are provided for receiving cargo and passengers
port buildings are constructed for commercial purposes
all the above.
Q.20.
The low water datum for a lake is defined as the surface of the lake when it is at elevation
180.5 m above M.S.L.
190.5 m above M.S.L.
170.5 m above M.S.L.
200.0 m above M.S.L.
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