64) By increasing the rise of lockgates, (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 Of these statements

65) Which of the following is a fixed type mooring accessory

66) The significant wave height is defined is the average height of the

67) If Hs is the significant wave height, then the average wave height and highest wave height respectively are given by

68) 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