Physics
Why does the sea appear blue in colour?

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

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Physics
Absolute Zero is defined as

At which the volume becomes zero
At which water boils at 298K
The temperature at which all molecular motion ceases
At which liquid Helium boils

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