Physics
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

The green ray
The red ray
The blue ray
The violet ray

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Physics
The blue colour of water in the sea is due to

Reflection of blue sky by sea water
Scattering of blue light by water molecules
Absorption of other colours except blue by water molecules
Reflection of blue light by impurities in sea water

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to expansion in summer can be avoided
Air-gaps are necessary for bearing the weight of running train
Steel can be saved
Accidents due to contraction in winter can be avoided

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