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Bringing a Super 20 MCQ on Harbor Docks which is frequently asked in Exam 1. The difference in height between highest high water and lowest low water is called : A. Mean range B. Maximum range C. Maximum rise D. Mean rise 2. If the maximum spring rise is 2m and height of the waves expected is 4m, then the breakwater height above the datum will be : A. 2.5m B. 4m C. 5m D. 7m 3. 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 ti 1.25 H above the mean sea level 4. In multiple point mooring system, vessel is secured to minimum of : A. Two points B. Four points C. Six points D. Eight points 5. Consider a pair of lock gates having a rise n, width of lock B and length of each gate L. If w is the unit pressure of water per unit length of gate, then the compressive force on the gate is given by : A. wLS/n B. wLS