Physics
The blue colour of water in the sea is due to

Absorption of other colours except blue by water molecules
Reflection of blue light by impurities in sea water
Scattering of blue light by water molecules
Reflection of blue sky by sea water

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Weighing will depend on their masses
The silver piece will weigh more
The gold piece will weigh more
Both silver and gold pieces weigh equal

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

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

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