ক) is a marine structure for berthing of vessels for loading and unloading cargo and passengers
খ) is an artificial basin for vessels where the variation of water in the shore does not affect the level of water
গ) is provided with a dock gate
ঘ) is provided with an arrangement to pump out water when required
ঙ) all the above.
০১। A harbour is a place where
ক) ships get shelter and protection against destructive forces due to sea waves
খ) facilities are provided for receiving cargo and passengers
গ) port buildings are constructed for commercial purposes
ঘ) all the above.
০২। A lead line or sounding line
ক) is stretched thoroughly when wet before it is graduated
খ) should be soaked in water for about one hour prior to taking soundings
গ) is adjusted at regular interval
ঘ) is generally used for depths exceeding 6 m
ঙ) all the above.
০৩। A low wall built out into the sea more or less perpendicular to the coast line, to resist the travel of sand and shingle along a beach, is called
ক) break water
খ) break wall
গ) groins
ঘ) shore wall.
০৪। A roadstead :
ক) is a protected area of water where boats can move safely
খ) is the end of the road at the harbour
গ) may be protected by break water walls
ঘ) none of these.
০৫। According to the recommendations of International Navigational Congress in 1912, the ratio of length to width at the entrance for cargo vessels is
ক) 5.5 and 6.0 to 1
খ) 6.2 and 6.8 to 1
গ) 7.4 and 7.8 to 1
ঘ) 8.2 and 8.5 to 1
০৬। According to the recommendations of International Navigational Congress in 1912, the ratio of length to width at the entrance for passenger vessels is :
ক) 7.25 to 1
খ) 7.80 to 1
গ) 8.11 to 1
ঘ) 8.44 to 1
০৭। At a place the shore line is along North West-South East. The wind is blowing from the north. The littoral drift will be along
ক) south east
খ) south
গ) south west
ঘ) west
ঙ) north west
০৮। Buoys which support the cables to which vessels are attached are of
ক) cylindrical shape
খ) drum
গ) pear shaped
ঘ) spherical shape
ঙ) all of these.
০৯। Cretans :
ক) are the harbours established on the island south east of Greek mainland
খ) are the natives of crete, an island south of Greek mainland
গ) are the plants, grown in the neighbourhood of harbours
ঘ) none of the above.
১০। Depth of borings for soil investigation, is generally kept below low water level
ক) 30 m
খ) 35 m
গ) 45 m
ঘ) 40 m
১১। Due to the impact of water wave on a sea shore structure
ক) hydrostatic pressure coupled with a strong momentary impact is caused
খ) vibrations are subjected
গ) internal pressure is developed
ঘ) weakens the foundation
ঙ) all of the above.
১২। Flow of air from one place to the other is caused due to
ক) the sum of elevation
খ) pressure head
গ) velocity head
ঘ) all of the above.
১৩। For large vessels, the buoys are strengthened by connecting it to a number of anchors having
ক) one legged mooring
খ) two legged mooring
গ) three legged mooring
ঘ) four legged mooring
ঙ) all the types as above.
১৪। For location of soundings a range and one angle from the shore involves the following operations. Which one is correct?
ক) A range line is established
খ) The first and the last soundings and every tenth soundings are fixed by angular observations
গ) The intermediate soundings are fixed by the time intervals
ঘ) All the above.
১৫। If F is the fetch, the straight line distance of open water available in kilometres, the height of the wave in metres is
ক) 0.15 F
খ) 0.20 F
গ) 0.28 F
ঘ) 0.34 F
১৬। 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
ক) 3.86 (h + h1 )
খ) 3.86 (h - h1 )
গ) 3.86 (h x h1 )
ঘ) 3.86 π (h + h1 )
১৭। In a wet dock system,
ক) minimum required depth of water for the vessels is maintained
খ) entrance locks are provided with massive gates
গ) the locks of dock gate are operated by means of heavy bascule bridges and connected machinery
ঘ) the cost of construction is quite heavy
ঙ) all the above.
১৮। In tropical regions,
ক) the surface gets heated more effectively than the arctic areas
খ) after heating, the air becomes lighter and is displaced by cool air from the polar regions
গ) the rising tropical air flows towards the polar region in the upper strata
ঘ) all of the above.
১৯। Littoral drift
ক) is the raised line of sand, parallel to the sea coast
খ) is the slow movement of surface water at sea caused by the wind
গ) is a current parallel to the shore, caused due to tangential component of the wind
ঘ) is a current perpendicular to the shore line caused due to wind.