Multiple choice general knowledge science & technology

The absorption of ink by blotting paper involves

  1. viscosity of ink

  2. capillary action phenomenon

  3. diffusion of ink through the blotting

  4. siphon action
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blotting paper has numerous tiny pores. Ink rises through these narrow channels due to capillary action - the phenomenon where liquid flows in narrow spaces without external forces, caused by surface tension and adhesive forces.

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