When a wave strikes a vertical breakwater in deep water, it is reflected back and on meeting another advancing wave of similar amplitude merges and rises vertically in a wall of water. This phenomenon is called_________________?

Related Mcqs:

1. 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 datum
   B. 1.2 H to 1.25 H above the low water level
   C. 1.2 H to 1.25 H above the high water level
   D. 1.2 H to 1.25 H above the mean sea level

2. As compared to wall type breakwater, mound type breakwater_________________?

   A. requires skilled labour
   B. requires low maintenance cost
   C. requires less material
   D. results in less damage due to gradual failure

3. 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 1.67 Hs
   B. 0.6 Hs and 1.87 Hs
   C. 1.27 Hs and 1.87 Hs
   D. 1.27 Hs and 1.67 Hs

4. Assertion A : Intervention of undulations in the sea bed reduces the depth of wave at the section. Reason R : No wave can have a height greater than the depth of water through which it passes?

   Select your answer based on the coding system given below?

   A. Both A and R are true and R is correct explanation of A.
   B. Both A and R are true but R is not the correct explanation of A.
   C. A is true but R is false.
   D. A is false but R is true

5. 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. 2.5 m
   B. 4 m
   C. 5 m
   D. 7 m

6. Assertion A : Large size stones are required in stone revetment in shore protection. Reason R : Resistance of stone to wave force is proportional to its volume and wave force is proportional to the exposed area of the stone?

   Select your answer based on the coding system given below

   A. Both A and R are true and R is the correct explanation of A
   B. Both A and R are true but R is not a correct explanation of A
   C. A is true but R is false
   D. A is false but R is true

7. A ship strikes the berth generally at an angle_________________?

   A. 90° with the face of the dock
   B. 45° with the face of the dock
   C. 30° with the face of the dock
   D. 10° with the face of the dock

8. 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. freeboard
   D. draft

9. The significant wave height is defined is the average height of the_________________?

   A. one – third highest waves
   B. one – fourth highest waves
   C. one – fifth highest waves
   D. one – tenth highest waves

10. As per Berlin’s formula, the length of wave in metres is given by_______________?

    A. 1.3412
    B. 1.5612
    C. 1.7412
    D. 1.9412

    where ‘t’ is the period in seconds for two successive waves to pass the same section