Physics
The absorption of ink by blotting paper involves:

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

ANSWER DOWNLOAD EXAMIANS APP

Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.
The level of the liquid in the two vessels are at the same height.

ANSWER DOWNLOAD EXAMIANS APP