Physics
Why does the sea appear blue in colour?

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

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail

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