CPE649: WATER QUALITY

1. Which of the following have size more than 1 micron?

• Dissolved material
• Suspended material
• Colloids

2. The following are the sources of suspended solids: -natural contaminants -domestic use of water -industrial use of water

• True
• False

3. NTU is a unit for color measurement.

• True
• False

4. Choose a correct statement.

• Manganese oxide gives reddish color
• Turbidity may interfere photosynthesis due to less light penetration
• Odor produced by organic substances are not carcinogenic

5. Which of the following is not the impact of temperature?

• Solubility of gases decreases at elevated temperatures
• Biological activities lower in higher temperature
• Physical properties e.g viscosity and density – affect planktonic microorganism
• Algae growth higher in warm water, causes algae mats – secrete oil and dead algae will causes taste & odor problem

6. The followings are the chemical parameters: I. Hardness II. Nutrients III. Alkalinity IV. Metals V. Total Dissolved Solids (TDS)

• III and IV
• III, IV and V
• II, III and V
• I and IV
• All of the above

7. Choose the INCORRECT statement.

• Echerichia Coli (E. coli) is a common bacteria that indicate the presence of pathogens
• Fungi is important in decomposing organic matter to simple forms
• Algae is useful in oxidation pond
• Virus is not a biological parameters for water quality

8. Parameters limit of effluent can be classified into Standard A and Standard B.

• True
• False

9. Standard B is applicable to discharge into any water within any catchment areas.

• True
• False

10. Water Quality Index (WQI) is a tool in water quality classification and to measure the degree of water pollution.

• True
• False