Cleaning of water is process of removing __________

• Pollutants

• Sewage

• Sludge

• Chemicals, kitchen waste

Dried __________ is used as manure.

• Sewage

• Chemicals, kitchen waste

• Sludge

• None of the above

The treatment of wastewater is commonly known as

• Cleaning of Water

• Sewerage Treatment

• Sewage Treatment

• All of the above

Drains get blocked by __________ and __________.

• Aeration, Sanitation

• Biogas , Sewer

• Anaerobic, Bacteria

• None of the above

Who said " No one need to wait for anyone else to adopt a humane and enlightened course of action"

Name liquid waste product

• Sewage

• Sewer

• Sludge

• None of the above

Micro-organisms which cause cholera

• Anaerobic Bacteria

• Bacteria

• Aerobic Bacteria

• None of the above

A chemical to disinfect water

• Copper Sulphate

• Distilled Water

• Iron Sulphate

• Chlorine

Which of these statements are correct about ozone?

• It is essential for breathing of living organisms.

• It is used to disinfect water.

• It absorbs ultraviolet rays.

• Its proportion in air is about 3%.