Physics
Why does the sea appear blue in colour?

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

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor but can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Should be in the form of a vertical rod
Can be of any shape

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