Physics
If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with

Constant acceleration
Constant velocity
Constant speed
Varying acceleration

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

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Physics
Radiocarbon is produced in the atmosphere as a result of

Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Lightning discharge in atmosphere.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.

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