Civil Engineering - Docks and Harbours MCQs Part 1

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 Option 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 plateform 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 Option 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 Option 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 Option 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 Option 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 Option 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 Option 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 Option 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 Option A

10. If F is the fetch, the straight line distance of open water available in kilometres, the height of the wave in metres is

A. 0.15 F

B. 0.20 F

C. 0.28 F

D. 0.34 F

 Answer Option D

11. 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 Option D

12. 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 Option A

13. 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 Option C

14. 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 Option B

15. 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 Option E

16. 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 Option D

17. The wavelength is computed by Bertin's formula (where T is the period in seconds).

A.

B.

C.

D.

 Answer Option B

18. 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 Option D

19. 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 Option C

20. 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 Option D

21. 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 Option E

22. 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 Option D

23. 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 Option E

24. 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 Option E

25. The important component of a sea port is

A. terminal buildings

B. the docks

C. the harbour

D. all of these.

 Answer Option D

26. 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 Option B

27. The fixed mooring does not require

A. mooring post

B. bollard

C. anchors

D. capstan.

 Answer Option C

28. 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 Option A

29. P and Q are two stations on the shore line at distance d. If the angle between Q and the boat O and P is a and the angle between P and Q at boat O is β, the x and y. Coordinate along PQ and perpendicular to PQ from O are :

A.

B.

C.

D. none of the above.

 Answer Option A

30. 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 Option D

31. 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 Option E

32. 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 Option E

33. 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 Option E

34. The horizontal angles from the boat between A and B and B and C, the stations on the shore are respectively θ1 and θ2. The distances AB = L1 and BC = L2. For 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).

A.

B. αt tan α2 = 360° - (θ1 + θ2 + β) = φ

C.

D. all the above.

 Answer Option D

35. 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 Option D

36. 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 Option D

37. The shape of docks and basins is generally kept

A. rectangular ways

B. diamond shape quays

C. inclined quays

D. all of these.

 Answer Option D

38. 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 Option C

39. 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 Option E

40. 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 Option D

41. 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

A. 3.86 (h + h1)

B. 3.86 (h - h1)

C. 3.86 (h x h1)

D. 3.86 π (h + h1)

 Answer Option A

42. 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 Option D

43. 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 Option D

44. 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 Option A

45. 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 Option D

46. 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 Option C

47. 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 Option E

48. 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 Option A

49. The width of the entrances of the harbours is restricted to

A. 100 m

B. 125 m

C. 150 m

D. 180 m

 Answer Option D

50. 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 Option E