MCQ’s On DOCKS AND HARBOURS
1. According to the recommendations of International Navigational Congress in 1912, the ratio of length to width at the entrance for cargo vessels is
A. 5.5 and 6.0 to 1
B. 6.2 and 6.8 to 1
C. 7.4 and 7.8 to 1
D. 8.2 and 8.5 to 1
Answer: C
2. Pick up the correct statement from the following:
A. An artificial barrier which makes the enclosed area safe for anchorage of ships, is known as break water
B. The break water whose inside is used as a platform for loading and unloading is called a mole
C. The length of the quay wall is governed by the length of the largest vessel likely to be berthed
D. All the above.
Answer: D
3. Buoys which support the cables to which vessels are attached are of
A. cylindrical shape
B. drum
C. pear shaped
D. spherical shape
E. all of these.
Answer: E
4. The beach is built:
A. with largest material locally available to the waves
B. with large material locally available to the waves
C. with fine material locally available to the waves
D. with finest material locally available to the waves.
Answer: A
5. Flow of air from one place to the other is caused due to
A. the sum of elevation
B. pressure head
C. velocity head
D. all of the above.
Answer: D
6. Pick up the correct statement from the following:
A. For nautical purposes, low water level is generally referred to by the navigators
B. The depth of the bed of the sea from the surface of water is called sounding
C. The contour lines on the bed of a water body are called fathoms
D. All the above.
Answer: D
7. Pick up the correct statement from the following:
A. The direction of the littoral drift depends upon the direction of the wave with respect to the coastline
B. The direction of a river opening to the sea determines the direction of no littoral drift
C. Harbour in the path of littoral drift is not constructed to avoid a build up of sand on one side and erosion on the other
D. all of the above.
Answer: D
8. 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
A. break water
B. break wall
C. groins
D. shore wall.
Answer: C
9. 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
A. south east
B. south
C. south west
D. west
E. north west
Answer: A
10. According to the recommendations of International Navigational Congress in 1912, the ratio of length to width at the entrance for passenger vessels is :
A. 7.25 to 1
B. 7.80 to 1
C. 8.11 to 1
D. 8.44 to 1
Answer: D
11. Pick up the correct statement from the following:
A. The operation of removing material from the sea or river bed is known as
B. Dredging
C. Digging
D. None of these.
Answer: A
12. Littoral drift
A. is the raised line of sand, parallel to the sea coast
B. is the slow movement of surface water at sea caused by the wind
C. is a current parallel to the shore, caused due to tangential component of the wind
D. is a current perpendicular to the shore line caused due to wind.
Answer: C
13. The heaviest line is used to democrate
A. the low water line
B. the high water line
C. the limit of swamps
D. the direction of current.
Answer: B
14. Which one of the following statements is correct?
A. The soundings are made with respect to the mean low water
B. The soundings which are below the datum are written in black on the map
C. The spot heights of the features above datum are written in red on the map
D. The decimal point of the sounding value is at the exact position of the sounding
E. All the above.
Answer: E
15. Pick up the correct statement from the following:
A. The regular periodic rise and fall of the surface of the sea, is called tide.
B. The average difference in water level between high tide and low tide at a place, is called tidal range
C. The movement of water caused by the action of tide, is called a tidal current
D. all of the above.
Answer: D
16. Depth of borings for soil investigation, is generally kept below low water level
A. 30 m
B. 35 m
C. 45 m
D. 40 m
Answer: C
17. Which one of the following land marks on the coast line must be depicted on hydrographic maps ?
A. shore line
B. light houses
C. church spires
D. all the above.
Answer: D
18. Pick up the correct statement function following:
A. The coarse material which has a smaller angle of repose, causes a steeper beach slope
B. The coarse material which has a greater angle of repose, causes a steeper beach slope
C. The flattening out of the beach is caused due to the movement of small and uniform particles leeward.
D. both (b) and (c).
Answer: D
19. A lead line or sounding line
A. is stretched thoroughly when wet before it is graduated
B. should be soaked in water for about one hour prior to taking soundings
C. is adjusted at regular interval
D. is generally used for depths exceeding 6 m
E. all the above.
Answer: E
20. The smoothened surface of the front face of the guay walls, is known as fending which is made of
A. granite stone
B. timber
C. steel
D. all the above.
Answer: D
21. The shore line survey includes :
A. depicting the shore line
B. depicting the prominent details on shore line
C. depicting the high water line
D. depicting the low water line
E. all the above.
Answer: E
22. Which one of the following statements is not relevant to hydrographic survey :
A. establishment of a chain of bench marks near the shore line
B. establishment of horizontal control points on the shore
C. determination of the sea bed profile
D. depicting the irregularities in the shore line, islands and projecting rocks
E. none of these.
Answer: E
23. The important component of a sea port is
A. terminal buildings
B. the docks
C. the harbour
D. all of these.
Answer: D
24. Cretans :
A. are the harbours established on the island south east of Greek mainland
B. are the natives of crete, an island south of Greek mainland
C. are the plants, grown in the neighbourhood of harbours
D. none of the above.
Answer: B
25. The fixed mooring does not require
A. mooring post
B. bollard
C. anchors
D. capstan.
Answer: C
26. The low water datum for a lake is defined as the surface of the lake when it is at elevation
A. 180.5 m above M.S.L.
B. 190.5 m above M.S.L.
C. 170.5 m above M.S.L.
D. 200.0 m above M.S.L.
Answer: A
27. A harbour is a place where
A. ships get shelter and protection against destructive forces due to sea waves
B. facilities are provided for receiving cargo and passengers
C. port buildings are constructed for commercial purposes
D. all the above.
Answer: D
28. Pick up the incorrect statement from the following: In a dry dock block made of hard wood,
A. spacing of the blocks is 1.35 m
B. the lowest block is 1.8 m long 40 cm x 40 cm in cross-section
C. the middle block is 1.6 m long 40 cm x 40 cm in crosss-section
D. the top block is 1.2 m long 40 cm x 40 cm in cross-section
E. none of these.
Answer: E
29. On a hydrographic map, the following feature is shown :
A. datum
B. high and low water lines
C. depth contours
D. land and water areas
E. all the above.
Answer: E
30. Due to the impact of water wave on a sea shore structure
A. hydrostatic pressure coupled with a strong momentary impact is caused
B. vibrations are subjected
C. internal pressure is developed
D. weakens the foundation
E. all of the above.
Answer: E
31. Pick up the correct statement from the following:
A. The breakwater which can be used as a platform for loading and unloading of cargo is called a mole
B. The brick masonry retaining wall which is used for loading and unloading of cargo is called guay wall
C. Three types of break waters are generally provided in harbours
D. All of the above.
Answer: D
32. The dock wall is designed as a gravity retaining wall and is tested for
A. back fill pressure when the dock is empty
B. maximum water pressure from the dock without any back fill
C. the load charge transmitted to the dock by the movement of loaded vehicles or trains on the way
D. all of the above.
Answer: D
33. The shape of docks and basins is generally kept
A. rectangular ways
B. diamond shape quays
C. inclined quays
D. all of these.
Answer: D
34. Surf zone is :
A. the fathom line of 10 m depth
B. the fathom line of 5 m depth
C. the swell of the sea breaking on the shore or reefs
D. the coast line attacked by the waves.
Answer: C
35. Which one of the following lines is used for tying a ship with a dock
A. bow line
B. stern line
C. spring line
D. break line
E. all of these.
Answer: E
36. Soundings are required for
A. making nautical charts for navigation
B. ascertaining the areas subject to scour or silting
C. obtaining detailed information for construction
D. all the above.
Answer: D
37. Pick up the correct statement from the following:
A. The artificial barrier constructed to enclose “n area for safe anchorage, is called break water
B. The smoothened surface at the top end of the vertical face of a guay wall, is called fending
C. The effective berthing lengths of inclined guays can be adjusted
D. All the above.
Answer: D
38. For location of soundings a range and one angle from the shore involves the following operations. Which one is correct ?
A. A range line is established
B. The first and the last soundings and every tenth soundings are fixed by angular observations
C. The intermediate soundings are fixed by the time intervals
D. All the above.
Answer: D
39. Pick up the correct statement from the following:
A. the Mediterranean sea is considered to be a huge harbour
B. the Caspean sea is considered to be a big harbour
C. the Red sea is considered to be harbour
D. none of the above.
Answer: A
40. Pick up the correct statement from the following:
A. a harbour without any port complex, is called a refuge harbour
B. a harbour used for fishery, is called fishery harbour
C. the terminal building of a commercial harbour consists of an administrative block, customs clearance and ware-houses.
D. all the above.
Answer: D
41. Pick up the incorrect statement from the following:
A. As a wave of sea water approaches the coast line, it is generally accompanied by a drift of water in the direction of wave advance
B. The on-shore wind helps to produce wave action as well as rise of M.S.L.
C. A falling hydraulic gradient occurs in the direction of the wave
D. The wave while receding carries finer particles out to deep water.
Answer: C
42. In a wet dock system,
A. minimum required depth of water for the vessels is maintained
B. entrance locks are provided with massive gates
C. the locks of dock gate are operated by means of heavy bascule bridges and connected machinery
D. the cost of construction is quite heavy
E. all the above.
Answer: E
43. A roadstead :
A. is a protected area of water where boats can move safely
B. is the end of the road at the harbour
C. may be protected by break water walls
D. none of these.
Answer: A
44. The width of the entrances of the harbours is restricted to
A. 100 m
B. 125 m
C. 150 m
D. 180 m
Answer: D
45. Pick up the correct statement from the following:
A. The tides at any place occur a little less than 1 hour later, each succeeding day
B. The difference in time in solar hours and minutes from any lunar transit to the succeeding transit, is called high water level
C. The influence of the earth’s gravity alone produces level-tidal less sea
D. The spinning force is maximum at the equator and zero at the poles
E. All of the above.
Answer: E
46. Location of soundings by range and one angle is done by the surveyor
A. on the shore
B. on the boat
C. on the shore or on the boat
D. none of the above.
Answer: C
47. The variation of atmospheric potential is caused due to :
A. difference in temperature over the surface of the earth
B. change in the density of air
C. both (a) and (b)
D. neither (a) nor (b).
Answer: C
48. Location of soundings by two angles from the shore requires establishing
A. one range line parallel to shore
B. one range line perpendicular to shore
C. two range lines mutually perpendicular
D. no range line.
Answer: D
49. The floating mooring does not require
A. cables
B. anchors
C. bollard
D. buoy.
Answer: C
50. Pick up the correct statement from the following:
A. The maritime structures should be designed to withstand wave motion of air
B. The wind vortex results in conical depression in the air surface
C. A tube of air rotating at hundreds of kilometres per hour forms a tornado
D. all of the above.
Answer: D
51. In tropical regions,
A. the surface gets heated more effectively than the arctic areas
B. after heating, the air becomes lighter and is displaced by cool air from the polar regions
C. the rising tropical air flows towards the polar region in the upper strata
D. all of the above.
Answer: D
52. For large vessels, the buoys are strengthened by connecting it to a number of anchors having
A. one legged mooring
B. two legged mooring
C. three legged mooring
D. four legged mooring
E. all the types as above.
Answer: E
53. On the sea shore structures, the water wave impact causes
A. direct compressive force due to its horizontal component
B. shear force due to deflected vertical force
C. compressive force due to collapse of the wave
D. suction force due to water returning after striking
E. all of the above.
Answer: E
54. Pick up the correct statement from the following:
A. Spring tides are caused at new and full moon
B. Neap tides are caused when the moon is in her quarters
C. Spring tides are roughly twice the height of neap tides
D. Flood tides and Ebbstides are caused after 24 hours and 50 minutes corresponding to a lunar day
E. All of the above.
Answer: E
55. A dock:
A. is a marine structure for berthing of vessels for loading and unloading cargo and passengers
B. is an artificial basin for vessels where the variation of water in the shore does not affect the level of water
C. is provided with a dock gate
D. is provided with an arrangement to pump out water when required
E. all the above.
Answer: E