Physics
A body moving in a circular path with a constant speed has a

Constant kinetic energy
Constant velocity
Constant acceleration
Constant displacement

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Physics
Rainbow is due to

diffusion of sunlight through water droplets
refraction and reflection of sunlight by water droplets
ionisation of water deposits
absorption of sunlight in minute water droplets

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Physics
Why does the sea appear blue in colour?

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

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