Water Treatment and Effluent Management MCQs 2026

Coagulation in water treatment uses

1. Aonly reverse osmosis membrane only step✓
2. Bchemical to destabilize colloidal particles✓
3. Conly chlorination only without solids removal✓
4. Donly activated carbon only for dissolved organics without coag✓

Flocculation promotes

1. Adissolving all salts instantly✓
2. Bparticle aggregation into settleable flocs✓
3. Cboiling river entirely✓
4. Donly RO membrane synthesis✓

Reverse osmosis removes ions by

1. Apressure-driven membrane rejection✓
2. Bonly gravity sand filter alone for ions✓
3. Conly aeration alone for TDS✓
4. Donly UV alone for salinity✓

Ion exchange softener replaces Ca²⁺ with

1. ACl₂ gas in water always✓
2. Bonly oxygen molecules✓
3. CNa⁺ on resin✓
4. Donly silica sand✓

Breakpoint chlorination aims to

1. Aincrease BOD✓
2. Badd hardness✓
3. Cprecipitate calcium only without disinfection✓
4. Doxidize ammonia and organic chloramines✓