Physics
Velocity of sound in air does not change with the change of

Pressure of air
Temperature of air
Moisture content in air
Wind in the direction of propagation of sound

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of adhesion are less
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them

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

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

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