Civil Engineering Docks and Harbours Quiz (or) MCQ

1 .

Every port is a harbour.

A)

True

B)

False

C)

Can not say

D)

--

Correct Answer : Option (A) : True

Explanation : Harbour is an enclosed area where there is storage, refuelling, loading and unloading of cargo facilities. A port is a harbour which provides all facilities for the transfer of cargo as well as passengers. So, all the ports are harbours.

2 .

A lead line or sounding line_________.

A)

is adjusted at regular interval

B)

is stretched thoroughly when wet before it is graduated

C)

should be soaked in water for about one hour prior to taking soundings

D)

All of the above

Correct Answer : Option (D) : All of the above

3 .

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

Correct Answer : Option (C) : 7.4 and 7.8 to 1

4 .

In basins subjected to strong winds and tide, the length of the berthing area should not be less than________.

A)

The length of design vessel

B)

The length of design vessel + 20% clearance between adjacent vessels

C)

The length of design vessel + 10% clearance between adjacent vessels

D)

Twice the length of design vessel

Correct Answer : Option (B) : The length of design vessel + 20% clearance between adjacent vessels

5 .

When a ship floats at its designed water line, the vertical distance from water line to the bottom of the ship is known as________.

A)

Beam

B)

Depth

C)

Draft

D)

Free-board

Correct Answer : Option (C) : Draft

6 .

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

Correct Answer : Option (D) : All of the above

7 .

Which of the following structures are constructed parallel to shore line to develop a demarcating line between land area and water area?

A)

Sea walls, bulk heads and revetments

B)

Sea walls, revetments and groynes

C)

Sea walls, bulk heads and groynes

D)

Bulk heads, revetments and groynes

Correct Answer : Option (B) : Sea walls, bulk heads and revetments

8 .

The significant wave height is defined is the average height of the________.

A)

one â€“ third highest waves

B)

one â€“ fourth highest waves

C)

one â€“ fifth highest waves

D)

one â€“ tenth highest waves

Correct Answer : Option (A) : one â€“ third highest waves

9 .

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)

groins

B)

break wall

C)

shore wall

D)

break water

Correct Answer : Option (A) : groins

10 .

For designing the dock, the proportion of ship load assumed to be borne by keel blocks is______.

A)

3 / 8

B)

3 / 16

C)

5 / 8

D)

5 / 16

Correct Answer : Option (C) : 5 / 8

11 .

As compared to wall type breakwater, mound type breakwater______.

A)

Requires skilled labor

B)

Requires less material

C)

Requires low maintenance cost

D)

Results in less damage due to gradual failure

Correct Answer : Option (D) : Results in less damage due to gradual failure

12 .

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)

8.44 to 1

C)

7.80 to 1

D)

8.11 to 1

Correct Answer : Option (B) : 8.44 to 1

13 .

Littoral drift________.

A)

is a current parallel to the shore, caused due to tangential component of the wind

B)

is the raised line of sand, parallel to the sea coast

C)

is the slow movement of surface water at sea caused by the wind

D)

is a current perpendicular to the shore line caused due to wind

Correct Answer : Option (A) : is a current parallel to the shore, caused due to tangential component of the wind

14 .

The heaviest line is used to democrate_______.

A)

the low water line

B)

the limit of swamps

C)

the high water line

D)

the direction of current

Correct Answer : Option (C) : the high water line

15 .

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 (âˆšh + âˆšhâ‚)

B)

3.86 (âˆšh - âˆšhâ‚)

C)

3.86 (âˆšh x âˆšhâ‚)

D)

3.86 Ï€ (âˆšh x âˆšhâ‚)

Correct Answer : Option (A) : 3.86 (âˆšh + âˆšh1)

16 .

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 intermediate soundings are fixed by the time intervals

C)

The first and the last soundings and every tenth soundings are fixed by angular observations

D)

All of the above

Correct Answer : Option (D) : All of the above

17 .

Pick up the correct statement from the following :

A)

a harbour used for fishery, is called fishery harbour

B)

a harbour without any port complex, is called a refuge harbour

C)

the terminal building of a commercial harbour consists of an administrative block, customs clearance and ware-houses.

D)

All of the above

Correct Answer : Option (D) : All of the above

18 .

A ship is berthed in a chamber and lifted by principles of buoyancy Such a chamber is called_______.

A)

Wet dock

B)

Floating dock

C)

Dry dock

D)

Refuge dock

Correct Answer : Option (B) : Floating dock

19 .

Minimum width of ship clearance shall be (where "B" is beam of the design vessel)_______.

A)

1.5 B

B)

50 m

C)

B or 30 m

D)

1.5 B or 50 m

Correct Answer : Option (C) : B or 30 m

20 .

In tropical regions,_____.

A)

the surface gets heated more effectively than the arctic areas

B)

the rising tropical air flows towards the polar region in the upper strata

C)

after heating, the air becomes lighter and is displaced by cool air from the polar regions

D)

All of the above

Correct Answer : Option (D) : All of the above

21 .

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 of the above

Correct Answer : Option (D) : All of the above

22 .

Consider the following statements.

(i) Fender is the cushion provided on the face of the jetty for ships to come in contact,
(ii) Slip is the space of water area between two adjacent piers where ships are berthed,
(iii) Pier head is a structure constructed near the tip of a break water near the harbour entrance.

Of the statements

A)

(i) and (ii) are correct

B)

(i) and (iii) are correct

C)

(ii) and (iii) are correct

D)

(i), (ii) and (iii) are correct

Correct Answer : Option (D) : (i), (ii) and (iii) are correct

23 .

Which of the following is a fixed type mooring accessory?

A)

bollard

B)

buoys

C)

cables

D)

anchors

Correct Answer : Option (A) : bollard

24 .

A ship strikes the berth generally at an angle________.

A)

10Â° with the face of the dock

B)

30Â° with the face of the dock

C)

45Â° with the face of the dock

D)

90Â° with the face of the dock

Correct Answer : Option (A) : 10Â° with the face of the dock

25 .

Which of the following are repair docks?

A)

dry docks, wet docks, floating docks, lift docks

B)

wet docks, floating docks, lift docks, marine railways

C)

wet docks, lift docks, marine railways, dry docks

D)

marine railways, dry docks, floating docks, wet docks

Correct Answer : Option (B) : wet docks, floating docks, lift docks, marine railways

26 .

Location of soundings by range and one angle is done by the surveyor______

A)

on the boat

B)

on the shore

C)

on the shore or on the boat

D)

None of the above

Correct Answer : Option (C) : on the shore or on the boat

27 .

The variation of atmospheric potential is caused due to :

A)

change in the density of air

B)

difference in temperature over the surface of the earth

C)

Both (A) and (B)

D)

Neither (A) nor (B)

Correct Answer : Option (C) : Both (A) and (B)

28 .

In multiple point mooring system, vessel is secured to minimum of______.

A)

Two points

B)

Four points

C)

Six points

D)

Eight points

Correct Answer : Option (B) : Four points

29 .

Which of the following type of sea walls results in greatest protection of shore structures?

A)

stepped sea wall

B)

vertical sea wall

C)

sea wall with batter

D)

sea wall with concave face

Correct Answer : Option (D) : sea wall with concave face

30 .

Depth of borings for soil investigation, is generally kept below low water level_________.

A)

30 m

B)

35 m

C)

40 m

D)

45 m

Correct Answer : Option (D) : 45 m

31 .

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 of the above

Correct Answer : Option (D) : All of the above

32 .

If the maximum spring rise is 2 m and height of the waves expected is 4 m , then the breakwater height above the datum will be_____.

A)

7 m

B)

5 m

C)

4 m

D)

2.5 m

Correct Answer : Option (A) : 7 m

33 .

As per Stevenson's empirical formula, the approximate value of the height of the wave in metres is given by (where F is the fetch in km.)_____.

A)

0.5 VF

B)

1.5 VF

C)

0.34 VF

D)

3.4 VF

Correct Answer : Option (C) : 0.34 VF

34 .

At a given port, the fetch is 400 nautical miles, the maximum height of storm wave will be______.

A)

8.169 m

B)

9.144 m

C)

6.8 m

D)

2.073 m

Correct Answer : Option (B) : 9.144 m

35 .

Due to the impact of water wave on a sea shore structure_______.

A)

vibrations are subjected

B)

internal pressure is developed

C)

hydrostatic pressure coupled with a strong momentary impact is caused

D)

All of the above

Correct Answer : Option (D) : All of the above

36 .

Cretans are the :

A)

plants, grown in the neighbourhood of harbours

B)

natives of crete, an island south of Greek mainland

C)

harbours established on the island south east of Greek mainland

D)

All of the above

Correct Answer : Option (B) : natives of crete, an island south of Greek mainland

37 .

The fixed mooring does not require_______.

A)

anchors

B)

bollard

C)

capstan

D)

mooring post

Correct Answer : Option (A) : anchors

38 .

The low water datum for a lake is defined as the surface of the lake when it is at elevation______.

A)

200.0 m above M.S.L.

B)

190.5 m above M.S.L.

C)

180.5 m above M.S.L.

D)

170.5 m above M.S.L.

Correct Answer : Option (C) : 180.5 m above M.S.L.

39 .

If 'Hs' is the significant wave height, then the average wave height and highest wave height respectively are given by___.

A)

0.6 Hs and 1.87 Hs

B)

0.6 Hs and 1.67 Hs

C)

1.27 Hs and 1.87 Hs

D)

1.27 Hs and 1.67 Hs

Correct Answer : Option (A) : 0.6 Hs and 1.87 Hs

40 .

The difference in height between highest high water and lowest low water is called________.

A)

Mean rise

B)

Mean range

C)

Maximum range

D)

Maximum rise

Correct Answer : Option (C) : Maximum range

41 .

The width of the entrances of the harbours is restricted to_____.

A)

100 m

B)

125 m

C)

150 m

D)

180 m

Correct Answer : Option (D) : 180 m

42 .

In a wet dock system,______.

A)

the cost of construction is quite heavy

B)

entrance locks are provided with massive gates

C)

minimum required depth of water for the vessels is maintained

D)

All of the above

Correct Answer : Option (D) : All of the above

Explanation : * the cost of construction is quite heavy
* entrance locks are provided with massive gates
* minimum required depth of water for the vessels is maintained
* the locks of dock gate are operated by means of heavy bascule bridges and connected machinery

43 .

How many components does a harbour comprise of?

A)

5

B)

10

C)

15

D)

20

Correct Answer : Option (B) : 10

Explanation : The various components of a harbour are entrance channel, break water, turning basin, shelter basin, pier, wharf, quay, dry dock, wet dock and jetty.

44 .

The solid parallel platform in a harbour with berthing facility on one side only is :

A)

Pier

B)

Quay

C)

Wharf

D)

Jetty

Correct Answer : Option (C) : Wharf

Explanation : A pier is the platform parallel to the shore with berthing possible on both sides, a quay provides berthing on one side and retains earth on other side. A jetty is a platform that is perpendicular to shoreline.

45 .

_______ is a type of utility based harbour.

A)

Commercial harbour

B)

Canal harbour

C)

River harbour

D)

Artificial harbour

Correct Answer : Option (A) : Commercial harbour

Explanation : The commercial harbour provides facilities for loading/unloading of cargo. An artificial harbour is based on the protection needed. (Manmade to protect from storms/waves). River and canal harbours are based on the location of these.

46 .

The alignment of breakwater should be :

A)

Diagonal

B)

Straight

C)

Horizontal

D)

Perpendicular

Correct Answer : Option (B) : Straight

Explanation : Breakwater is a protection barrier constructed to protect the harbour from the effect of sea waves. Its alignment should be straight with an intersection angle within 60o & sometimes curved in the open sea to reduce the effect of waves.

47 .

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

A)

steel

B)

timber

C)

granite stone

D)

All of the above

Correct Answer : Option (D) : All of the above

48 .

The shore line survey includes :

A)

depicting the shore line

B)

depicting the low water line

C)

depicting the high water line

D)

All of the above

Correct Answer : Option (D) : All of the above

Explanation : * depicting the shore line
* depicting the high water line
* depicting the low water line
* depicting the prominent details on shore line

49 .

Buoys which support the cables to which vessels are attached are of_______.

A)

pear shaped

B)

spherical shape

C)

cylindrical shape

D)

All of the above

Correct Answer : Option (D) : All of the above

50 .

Consider the following statements in regard to Beaufort scale for wind speeds,

(i) The Beaufort number ranges from 1 to 12.
(ii) Higher Beaufort number indicates higher speed of wind,
(iii) Beaufort number for calm is smallest and for hurricane is highest

Of these statements

A)

(i) and (ii) are correct

B)

(ii) and (iii) are correct

C)

(i) and (iii) are correct

D)

(i), (ii) and (iii) are correct

Correct Answer : Option (B) : (ii) and (iii) are correct

51 .

The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be ________.

A)

1 L

B)

2.0 L

C)

4.0 L

D)

1.5 L

Correct Answer : Option (C) : 4.0 L

52 .

Surf zone is :

A)

the fathom line of 5 m depth

B)

the fathom line of 10 m depth

C)

the coast line attacked by the waves

D)

the swell of the sea breaking on the shore or reefs

Correct Answer : Option (D) : the swell of the sea breaking on the shore or reefs

53 .

In a two lane channel, bottom width of channel is given by________.

A)

Manoeuvring lane + (2 Ã— Bank clearance lane)

B)

(2 Ã— Manoeuvring lane) + (2 Ã— Bank clearance lane + ship clearance lane)

C)

(2 Ã— Manoeuvring lane) + (2 Ã— Bank clearance lane)

D)

Manoeuvring lane + (2 Ã— Bank clearance lane) + ship clearance lane

Correct Answer : Option (B) : (2 Ã— Manoeuvring lane) + (2 Ã— Bank clearance lane + ship clearance lane)

54 .

Which of the following conditions of loading imposes the greatest load on the foundation in case of dry docks?

A)

When the dock is empty

B)

When the dock is full of water

C)

When the dock is dry and is under construction

D)

When the dock is empty with the ship of maximum tonnage

Correct Answer : Option (B) : When the dock is full of water

55 .

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)

north west

Correct Answer : Option (A) : south east

56 .

The open type of wharves are made of :

A)

Timber

B)

R.C.C

C)

Both (A) and (B)

D)

Neither (A) nor (B)

Correct Answer : Option (C) : Both (A) and (B)

57 .

The marine structure located alongside or at the entrance of a pier or a wharf is :

A)

Fenders

B)

Breakwater

C)

Dolphins

D)

Pier heads

Correct Answer : Option (C) : Dolphins

Explanation : These structures provide mooring facilities for ships, absorb impact force and shorten the length of a pier or a wharf.

58 .

The ferry designs are dependent on :

A)

Length of route

B)

Aesthetics

C)

Weather conditions

D)

Country where it is used

Correct Answer : Option (A) : Length of route

Explanation : The ferry designs depend on factors like passenger capacity, speed, water conditions and length of route; ex- a double ended ferry used in States Island, Washington, which has interchangeable sterns & bows to shuttle the route without turning around.

59 .

On the sea shore structures, the water wave impact causes :

A)

shear force due to deflected vertical force

B)

compressive force due to collapse of the wave

C)

suction force due to water returning after striking

D)

All of the above

Correct Answer : Option (D) : All of the above

Explanation : * shear force due to deflected vertical force
* compressive force due to collapse of the wave
* suction force due to water returning after striking
* direct compressive force due to its horizontal component

60 .

As per Berlin's formula, the length of wave in meters is given by (Where 't' is the period in seconds for two successive waves to pass the same section.)

A)

1.3412

B)

1.5612

C)

1.7412

D)

1.9412

Correct Answer : Option (B) : 1.5612

61 .

A)

Staging method

B)

Barge method

C)

Low level method

D)

None of the above

Correct Answer : Option (A) : Staging method

62 .

Soundings are required for___________.

A)

making nautical charts for navigation

B)

obtaining detailed information for construction

C)

ascertaining the areas subject to scour or silting

D)

All of the above

Correct Answer : Option (D) : All of the above

63 .

By increasing the rise of lock-gates,

(i) The length of the lock gate will increase
(ii) Transverse stress due to water pressure on the gate will increase
(iii) Compressive force on the gate will increase

A)

(i) and (ii) are correct

B)

(i) and (iii) are correct

C)

Only (ii) is correct

D)

Only (iii) is correct

Correct Answer : Option (A) : (i) and (ii) are correct

64 .

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 âˆšF

B)

0.20 âˆšF

C)

0.34 âˆšF

D)

0.42 âˆšF

Correct Answer : Option (C) : 0.34 âˆšF

65 .

The maximum harbour depth below lowest low water is generally equal to

(i) loaded draft + 1.2 m when bottom is rock
(ii) loaded draft + 1.8 m when bottom is soft
(iii) loaded draft + 1.2 m when bottom is soft
(iv) loaded draft + 1.8 m when bottom is rock

A)

(i) and (ii) are correct

B)

(ii) and (iv) are correct

C)

(iii) and (iv) are correct

D)

(i) and (iii) are correct

Correct Answer : Option (C) : (iii) and (iv) are correct

66 .

If H is the height of the wave expected, then the height of the breakwater is generally taken as_______.

A)

1.2 H to 1.25 H above the high water level

B)

1.2 H to 1.25 H above the datum

C)

1.2 H to 1.25 H above the mean sea level

D)

1.2 H to 1.25 H above the low water level

Correct Answer : Option (A) : 1.2 H to 1.25 H above the high water level