Paper 1 · People, Development and Environment
Which of the following are true about the flotation method for waste management? A. It is a water-treatment process that clarifies wastewaters by removing suspended matter such as oil or solids. B. The removal is achieved by dissolving air under pressure and then releasing it at atmospheric pressure in a flotation tank. C. Flotation is a separation technique that uses gas bubbles as a transport medium.
AA, B and C ✓ Correct
BB and C
CA and C
DA and B
Correct answer: (A) A, B and C — All three statements A, B and C are true, so that is the answer.
Explanation
★All three statements A, B and C are true, so that is the answer.
★Flotation clarifies wastewater by removing suspended oil or solids.
★It works by dissolving air under pressure and releasing it in a flotation tank.
★It separates matter using gas bubbles as a transport medium.
★So each of the three statements is true.
★So the answer is A, B and C.
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