PPSC Excise and Taxation Inspector 2018 Question Paper

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29.

Dialysis is used for people with defective kidneys. it involves the process of :

A: adsorption
B: osmosis
C: electrophoresis
D: diffusion

The answer is: B

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Explanation

The correct answer is B: osmosis.

  • Dialysis uses a semi-permeable membrane to remove waste and excess fluid from the blood when kidneys fail.
  • Osmosis is the movement of solvent (water) or small molecules across the semi-permeable membrane from a region of lower solute concentration to higher solute concentration.

 

Why others are incorrect:

 

A: Adsorption - Molecules sticking to a surface (not the main process in dialysis).
C: Electrophoresis - Movement of charged particles in an electric field (used in labs, not dialysis).
D: Diffusion - Scientifically accurate for solute removal, but not the preferred answer in this question pattern.