45) 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 Of these statements

46) The minimum diameter of turning besin, where ships turn by going ahead and without tug assistance should be [where L is the length of the largest ship to use the port]

47) Dead weight tonnage of a shipi) varies with latitude and seasonii) is more than displacement tonnageiii) is the difference between displacement load and displacement light Of these statements

48) In basins subjected to strong winds and tide, the length of the berthing area should not be less than

49) 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.]