Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

The density of salt solution exceeds the density of eggs
Albumin dissolves in salt solution and egg becomes lighter
Egg absorbs salt from the solution and expands
Water has high surface tension

ANSWER DOWNLOAD EXAMIANS APP

Physics
Why does the sea appear blue in colour?

Scattering of the sunlight by water molecules
Reflection of the sun light from water surface
Refraction of the sun light
Interference of the sun light from water surface

ANSWER DOWNLOAD EXAMIANS APP