Device to separate substances by spinning them at high speed.

• A. Centrifuge
• B. Chlorination
• C. Blank
• D. Biomass

Answer: (A)

Centrifugal separation relies on density differences and rapid rotation. A centrifuge spins a mixture, creating centrifugal force that pushes heavier particles outward so solids separate from liquids. This allows solids to be removed or concentrated much faster than by gravity alone, which is why centrifuges are widely used to dewater sludge and separate suspended solids in wastewater treatment. Chlorination is a disinfection process, biomass refers to biological material, and a blank isn’t a device, so they don’t perform the separation by spinning.