# Harbour and Dock Engineering Online Practice – Set 06

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## Q1. 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) None of these

## Q2. The heaviest line is used to democrat

(A) The low water line
(B) The high water line
(C) The limit of swamps
(D) The direction of current

## Q3. 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) 180.5 m above M.S.L.

## Q4. Pick up the correct statement from the following:

(C) Three types of break waters are generally provided in harbours
(D) All of the above

Answer: (D) All of the above

## Q5. On a hydrographic map, the following feature is shown:

(A) High and low water lines
(B) Depth contours
(C) Land and water areas
(D) All the above

## Q6. 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

## Q7. Pick up the correct statement from the following:

(A) The Mediterranean Sea is considered to be a huge harbour
(B) The Caspian Sea is considered to be a big harbour
(C) The Red sea is considered to be harbour
(D) None of the above

Answer: (A) The Mediterranean Sea is considered to be a huge harbour

## Q8. 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) A falling hydraulic gradient occurs in the direction of the wave

## Q9. 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

## Q10. 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) All the types as above

Answer: (D) All the types as above

## Q11. 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) All of the above

Answer: (D) All of the above

## Q12. 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) On the shore or on the boat

## Q13. Flow of air from one place to the other is caused due to

(A) The sum of elevation
(D) All of the above

Answer: (D) All of the above

(A) 7.25 to 1
(B) 7.80 to 1
(C) 8.11 to 1
(D) 8.44 to 1