Question

of the floating iceberg in sea the portion remaining above the sea level is

Answer 1

There are a few reasons why icebergs float in water. First, water in liquid state is denser than in solid form. Second, most icebergs contain a lot of air in tiny pockets trapped inside; in fact this why they are white in appearance. Third, icebergs origin in fresh water, which is less dense than sea or saline water. All these factors lead to icebergs floating in the sea water.
Typically, one tenth of an iceberg is above water. This can be explained by Archimedes's principle. The portion above the sea is called the 'tip' of the iceberg.