Physics
Light scattering takes place in

Acidic solutions
Electrolyte solutions
Colloidal solutions
Basic solutions

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

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

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Metals have higher thermal capacity than plastics
Plastics have a higher thermal conductivity than metals
Plastics have a lower density than metals
Metals are good conductors of heat

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