Physics
A needle or a pin floats on the surface of water because of

Viscosity
Surface tension
Surface energy
Adhesive force

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the largest surface area for a given volume
A sphere has the least surface area for a given volume
Inter molecular forces are weak in liquids
Intermolecular forces are strong in liquids

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Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
None of the given statements is correct.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.

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