Question

Match the following:

Column A	Column B
1. Aeration	a. Suspended matter settles to the bottom
2. Filtration	b. Chlorine tablets are added
3. Chlorination	c. Passes through layer of sand
4. Sedimentation	d. Air is bubbled

• A. 1-a; 2-c; 3-b; 4-d
• B. 1-d; 2-c; 3-b; 4-a
• C. 1-b; 2-d; 3-c; 4-a
• D. 1-d; 2-b; 3-a; 4-c

Answer 1

The correct option is B 1-d; 2-c; 3-b; 4-a

Aeration- air under pressure is then blown into the filtered water

Chlorination-chlorine tablets are added into water to kill all the germs present in it.

Filtration-water after sedimentation steel contain lighter suspended impurities which are removed by filtration through beds of sand and gravel

Sedimentation-most of the suspended matter (heavier particles) settles to the bottom