Q.1
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.
0 h : 0 m : 1 s