Which is the most practical and economical method for removal of suspended solid matter from polluted water ?

A. Blood poisoning
B. Anaemia
C. Nervous system disorder
D. All A., B. and C.

A. With greater number of blades
B. Of increased diameter
C. Both A. & B.
D. Neither A. nor B.

A. Gravity settling chamber
B. Cyclone separator
C. Electrostatic precipitator
D. Bag filter

A. Colloids or aerosols
B. Powder
C. Dust
D. Smoke

A. Natural aeration of water stream
B. Photosynthetic action of algae
C. Both A. & B.
D. Neither A. nor B.

A. Dissolved solid
B. Suspended solid
C. Oil & fatty
D. Gritty & inorganic