Physics
What is a neuron ?

Basic unit of nervous system
The anti-particle of neutron
Particle released during radioactivity
Basic unit of energy

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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
Scattering of the sunlight by water molecules
Refraction of the sun light

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Physics
Railway tracks are banked on curves so that

Necessary centripetal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards

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