Water supply is:

• A. To supply water for agricultural use

• B. To supply water for industrial use

• C. To supply water for commercial use

• D. To supply water for community use as for specific purposes

Water can be extracted from sources such:

• A. Rivers and lakes

• B. State Authorities

• C. Rain water gutter

• D. Public Donation

The following statements are true about hard water, EXCEPT:

• A. Occurs due to the presence of calcium or magnesium salts

• B. Low or have no bicarbonate salts

• C. The hardness can be remove by boiling process

• D. The hardness can be remove by Base Exchange Process

- Easier to obtain lather in soap

-Contains of high oxygen (O2)

-Free from dissolved salts of magnesium and calcium

The above statements are refer to:

• A. Hard Water

• B. Soft water

Choose the correct answer for a characteristic of hard water:

• A. Contains sodium ions only

• B. Foam is produced due to the good effect of soap

• C. Formed when water flows through limestone and chalk

• D. Produced by passing hard water over an ion exchange resin

Water treatment aims to:

• A. To improve the colour of water

• B. To increase the mineral content in water

• C. To reduce the formed of foam

• To improve the quality of water which meets the standard to be safely used for specific purposes

There are several stages of water treatment such screening, _______, flocculation, _______, coagulation, flouridation, _______, filtration,

_______ and conditioning. The blank answers are:

• A. Aeration, Evaporation,

  Oxidation and Condensation

• B. Chlorination, 2nd filtration, oxidation and precipitation

• C. Precipitation, Evaporation, Condensation and Infiltration

• D. Aeration, Chlorination, sedimentation and 2nd Chlorination

In this water treatment process, the slaked lime will be added. This is refer to:

• A. Aeration

• B. Screening

• C. Flouridation

• D. Conditioning

Sedimentation process are to:

• A. Ease the flocculation process

• B. Prevent pumps being damaged by the debris

• C. Sink the heavy particles to the bottom of the tanks which leaving clear water on top

• D. To obtain clear water

A specific dose of chlorine is added to clear water. This is refer to:

• A. Chlorination

• B. Filtration

• C. 2nd Chlorination

• D. Conditioning