GATE CE 2023 Set 1 — Question 45

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MCQ+2 / -0.67EasyTrickling FilterWastewater Treatment ProcessesEnvironmental EngineeringCoagulation & FlocculationDrinking Water TreatmentUnit Processes

Environmental Engineering → Drinking Water Treatment → Coagulation & Flocculation

Last updated 5 September 2026

Question

In the following table, identify the correct set of associations between the entries in Column-1 and Column-2. Column-1 Column-2 P: Reverse Osmosis I: Ponding Q: Trickling Filter II: Freundlich Isotherm R: Coagulation III: Concentration Polarization S: Adsorption IV: Charge Neutralization

Column-1	Column-2
P: Reverse Osmosis	I: Ponding
Q: Trickling Filter	II: Freundlich Isotherm
R: Coagulation	III: Concentration Polarization
S: Adsorption	IV: Charge Neutralization

Correct answer (D) P-III, Q-I, R-IV Solution The correct associations are: P: Reverse Osmosis matches with III: Concentration Polarization . This is a phenomenon where solute accumulates at the membrane surface, increasing osmotic pressure. Q: Trickling Filter matches with I: Ponding . Ponding occurs when the biological growth (slime layer) becomes too thick, clogging the filter media. R: Coagulation matches with IV: Charge Neutralization . Coagulants are added to neutralize the negative surface charges of colloidal particles so they can aggregate. S: Adsorption matches with II: Freundlich Isotherm . This is a mathematical model used to describe the relationship between the amount of adsorbate on an adsorbent and the concentration of the adsorbate in the liquid phase. Comparing with the options, Option (D) correctly identifies P-III, Q-I, and R-IV. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (D) P-III, Q-I, R-IV Solution The correct associations are: P: Reverse Osmosis matches with III: Concentration Polarization . This is a phenomenon where solute accumulates at the membrane surface, increasing osmotic pressure. Q: Trickling Filter matches with I: Ponding . Ponding occurs when the biological growth (slime layer) becomes too thick, clogging the filter media. R: Coagulation matches with IV: Charge Neutralization . Coagulants are added to neutralize the negative surface charges of colloidal particles so they can aggregate. S: Adsorption matches with II: Freundlich Isotherm . This is a mathematical model used to describe the relationship between the amount of adsorbate on an adsorbent and the concentration of the adsorbate in the liquid phase. Comparing with the options, Option (D) correctly identifies P-III, Q-I, and R-IV.

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GATE CE 2023 Set 1 — Question 45

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