Water Purification Quiz

What is the goal of water purification?

• To add undesirable chemicals to water

• To make water colorful

• To produce water fit for specific purposes

• To increase the concentration of contaminants

Which method is NOT used in water purification?

• Chlorination

• Distillation

• Filtration

• Boiling

What is the main purpose of pre-treatment in water purification?

• To make water unsafe to drink

• To reduce the quality of water

• To remove unwanted constituents in the water

• To add contaminants to water

What is the purpose of flocculation in water purification?

• To remove turbidity or color from water

• To make water colorful

• To increase the concentration of suspended particles

• To add more contaminants to water

What is the function of sedimentation in water purification?

• To remove floc by allowing it to settle to the bottom

• To increase the concentration of floc

• To add more suspended particles to water

• To make water acidic

What is the purpose of filtration in water purification?

• To add more contaminants to water

• To decrease the pH of water

• To remove remaining suspended particles and unsettled floc

• To increase the turbidity of water

What is the pH of distilled water?

• 5

• 9

• 7

• 11

Which substance is NOT used as a flocculating agent in water purification?

• Iron (III) hydroxide

• Aluminium hydroxide

• Aluminium hydroxychloride

• Sodium chloride

What is the minimum clarifier retention time in sedimentation?

• 6 hours

• 4 hours

• 2 hours

• 1 hour

Where are upland reservoirs usually located?

• Underground

• Next to industrial areas

• In the middle of a city

• Above any human habitation