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?

Related Mcqs:

1. Assertion A : Depth and width required at the entrance to a harbour are more than those required in the channel. Reason R : The entrance to a harbour is usually more exposed to waves as compared to the harbour itself__________________?

   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 the correct explanation of A.
   C. A is true but R is false.
   D. A is false but R is true.

2. 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

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

   A. vertical sea wall
   B. sea wall with batter
   C. stepped sea wall
   D. sea wall with concave face

5. Assertion A : Basin walls have to be of much grater height than dock walls. Reason R : Tidal basins are subject to fluctuations of levels due to tidal variations?

   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 correct explanation of A.
   C. A is true but R is false.
   D. A is false but R is true.

6. 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_________________?

   A. Surf
   B. Clapotis
   C. Fetch
   D. Swell

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 groynes
   B. sea walls, bulk heads and revetments
   C. sea walls, revetments and groynes
   D. bulk heads, revetments and groynes

8. Which of the following structures protects the shore by trapping of littoral drift?

   A. groynes
   B. sea walls
   C. revetments
   D. moles

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