Physics
Blotting paper absorbs ink due to

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

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Physics
A drop of liquid assumes spherical shape because:

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

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