Physics
The absorption of ink by blotting paper involves:

Viscosity of ink
Capillary action phenomenon
Diffusion of ink through the blotting
Siphon action

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Physics
Rainbows are produced when sunlight :

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

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