Q.1

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

  • 0.15 F
  • 0.20 F
  • 0.28 F
  • 0.34 F
Q.2

According to the recommendations of International Navigational Congress inthe ratio of length to width at the entrance for passenger vessels is :

  • 7.25 to 1
  • 7.80 to 1
  • 8.11 to 1
  • 8.44 to 1
Q.3

Pick up the incorrect statement from the following:

  • 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
  • The on-shore wind helps to produce wave action as well as rise of M.S.L.
  • A falling hydraulic gradient occurs in the direction of the wave
  • The wave while receding carries finer particles out to deep water.
Q.4

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
  • none of these.
Q.5

A lead line or sounding line

  • is stretched thoroughly when wet before it is graduated
  • should be soaked in water for about one hour prior to taking soundings
  • is adjusted at regular interval
  • is generally used for depths exceeding 6 m
  • all the above.
Q.6

Pick up the correct statement from the following:

  • The operation of removing material from the sea or river bed is known as
  • Dredging
  • Digging
  • None of these.
Q.7

In a wet dock system,

  • the cost of construction is quite heavy
  • 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
  • all the above.
Q.8

On a hydrographic map, the following feature is shown :

  • datum
  • high and low water lines
  • depth contours
  • land and water areas
  • all the above.
Q.9

The smoothened surface of the front face of the guay walls, is known as fending which is made of

  • granite stone
  • timber
  • steel
  • all the above.
Q.10

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.11

Littoral drift

  • is the raised line of sand, parallel to the sea coast
  • is the slow movement of surface water at sea caused by the wind
  • is a current parallel to the shore, caused due to tangential component of the wind
  • is a current perpendicular to the shore line caused due to wind.
Q.12

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.13

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
  • all of the above.
Q.14

Pick up the correct statement from the following:

  • The artificial barrier constructed to enclose "n area for safe anchorage, is called break water
  • The smoothened surface at the top end of the vertical face of a guay wall, is called fending
  • The effective berthing lengths of inclined guays can be adjusted
  • All the above.
Q.15

The heaviest line is used to democrate

  • the low water line
  • the high water line
  • the limit of swamps
  • the direction of current.
Q.16

Which one of the following statements is correct?

  • The soundings are made with respect to the mean low water
  • The soundings which are below the datum are written in black on the map
  • The spot heights of the features above datum are written in red on the map
  • The decimal point of the sounding value is at the exact position of the sounding
  • All the above.
Q.17

The width of the entrances of the harbours is restricted to

  • 100 m
  • 125 m
  • 150 m
  • 180 m
Q.18

Pick up the correct statement from the following:

  • The breakwater which can be used as a platform for loading and unloading of cargo is called a mole
  • The brick masonry retaining wall which is used for loading and unloading of cargo is called guay wall
  • Three types of break waters are generally provided in harbours
  • All of the above.
Q.19

Which one of the following statements is not relevant to hydrographic survey :

  • establishment of a chain of bench marks near the shore line
  • establishment of horizontal control points on the shore
  • determination of the sea bed profile
  • depicting the irregularities in the shore line, islands and projecting rocks
  • none of these.
Q.20

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.
0 h : 0 m : 1 s