Question

It is easier for a person to swim in sea water than in river water. The reason is that:

• A. the density of sea water is less than the density of river water.
• B. the density of sea water is more than the density of river water.
• C. sea water is heavier than the river water.
• D. sea water is lighter than the river water.

Answer 1

The correct option is B

the density of sea water is more than the density of river water.

It is easier for a person to swim in sea water than in river water. The reason is that the sea water contains salt and so its density is more than the density of river water. The weight of a man gets balanced by the less immersed part of his body in sea water as compared to river water. Thus, it is easier for a person to swim in sea water than in river water.