25 Wastewater Treatment MCQs for RSPCB JSO/JEE | Turbidity, BOD, COD, pH, Alkalinity & More -

Test your depth of understanding with these high-level multiple-choice questions covering the complete wastewater and water quality syllabus. Each question is designed to challenge your conceptual clarity and application skills for exams like RSPCB JSO and JEE (Environmental). Answers and reasoning are provided immediately.

Quiz: Physical Chemical and Biological Characteristics of Water

25 Qs Time: 15 Minut

1 / 25

1. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Lesser of total hardness and alkalinity

3. Total hardness

4. Alkalinity

2 / 25

2. Suspended solids are best defined as solids which:

1. Settle only after coagulation

2. Are retained by filtration

3. Pass through 1 µm filter

4. Are soluble in water

3 / 25

3. Minimum DO required in a river after sewage discharge to protect aquatic life is:
A. 1 mg/L
B. 2 mg/L
C. 4 mg/L
D. 6 mg/L

1. A

2. B

3. D

4. C

4 / 25

4. Chlorides in wastewater are determined using:

1. Conductivity method

2. EDTA titration

3. Argentometric titration

4. Winkler method

5 / 25

5. Nephelometer measures turbidity based on light scattered at:
नेफेलोमीटर किस कोण पर बिखरे प्रकाश को मापता है?

1. 0°

2. 90°

3. 180°

4. 45°

6 / 25

6. pH 8.3 in alkalinity titration corresponds to neutralization of:
क्षारीयता टाइट्रेशन में pH 8.3 किसके न्यूट्रलाइज़ेशन को दर्शाता है?

1. OH⁻ and half CO₃²⁻

2. Only carbonate

3. Only bicarbonate

4. Total alkalinity

7 / 25

7. High chloride concentration in sewage indicates:

1. Fresh sewage

2. Seawater intrusion

3. Domestic sewage

4. Biological oxidation

8 / 25

8. Kjeldahl nitrogen represents:
A. Only ammonia nitrogen
B. Only nitrate nitrogen
C. Total nitrogen

1. B and C

2. A B and C

3. A and B

4. A and C

9 / 25

9. Standard oxidizing agent used in COD test is: COD परीक्षण में प्रयुक्त मानक ऑक्सीडाइज़र है:

1. KMnO₄

2. K₂Cr₂O₇

3. Ozone

4. Chlorine

10 / 25

10. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. No organic matter

3. Incomplete oxidation

4. Fully treated sewage

11 / 25

11. Settleable solids in sewage are measured using:

1. Conductivity meter

2. Nephelometer

3. Imhoff cone

4. EDTA titration

12 / 25

12. Approximate estimation of TDS is commonly done using:

1. Imhoff cone

2. Electrical conductivity

3. EDTA titration

4. Turbidity

13 / 25

13. Alkalinity of water is expressed in terms of:

1. mg/L as HCO₃⁻

2. mg/L as CaCO₃

3. meq/L as OH⁻

4. mg/L as CO₃⁻

14 / 25

14. High pH in wastewater mainly causes:

1. Increased turbidity

2. Increased BOD

3. Scaling

4. Corrosion

15 / 25

15. Nitrites are measured using colour development with:

1. KMnO₄

2. Phenol-disulphonic acid

3. EDTA

4. Sulphanilic acid and naphthamine

16 / 25

16. The optimum pH range for biological wastewater treatment is:

1. 8.5 – 10.5

2. 4.5 – 6.5

3. 5.5 – 9.5

4. 6.5 – 8.5

17 / 25

17. Which statement is always true?

1. BOD > COD

2. COD < DO

3. COD > BOD

4. COD = BOD

18 / 25

18. The major objection of turbidity in water treatment is that it:

1. Increases alkalinity

2. Reduces hardness

3. Increases pH

4. Reduce Disinfectants efficiency

19 / 25

19. The most accurate instrument for measuring low turbidity in drinking water is:

1. Baylis turbidimeter

2. Jackson’s turbidimeter

3. Turbidity rod

4. Nephelometer

20 / 25

20. Particles larger than 10 μm are classified as:
10 माइक्रोन से बड़े कण कहलाते हैं:

1. Settleable solids

2. Volatile solids

3. Colloidal solids

4. Dissolved solids

21 / 25

21. If COD is very high but BOD is very low, wastewater is:
यदि COD अधिक और BOD बहुत कम है, तो अपशिष्ट जल है:

1. Highly biodegradable

2. Fully treated

3. Non-biodegradable

4. Fresh sewage

22 / 25

22. Municipal sewage is considered highly polluting mainly because:

1. It contains toxic metals

2. It contains pathogens and biodegradable organic matter

3. It is acidic in nature

4. It contains high TDS only

23 / 25

23. Wastewater with BOD5/COD ratio = 0.65 is considered: जिस अपशिष्ट जल का BOD5/COD = 0.65 हो, वह माना जाता है:

1. Highly biodegradable

2. Partially biodegradable

3. Moderately biodegradable

4. Untreatable

24 / 25

24. BOD measures:
A. Total organic matter
B. Biodegradable organic matter
C. Non-biodegradable organics
D. Inorganic solids

1. B only

2. A B and C

3. A only

4. B and C

25 / 25

25. Which of the following is NOT a physical characteristic of wastewater?

1. BOD

2. Colour

3. Temperature

4. Turbidity

Your score is

The average score is 40%

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Quiz: Physical Chemical and Biological Characteristics of Water

25 Qs Time: 15 Minut

1 / 25

1. Wastewater with BOD5/COD ratio = 0.65 is considered: जिस अपशिष्ट जल का BOD5/COD = 0.65 हो, वह माना जाता है:

1. Partially biodegradable

2. Highly biodegradable

3. Moderately biodegradable

4. Untreatable

2 / 25

2. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. Turbidity

3. Imhoff cone

4. EDTA titration

3 / 25

3. High pH in wastewater mainly causes:

1. Corrosion

2. Scaling

3. Increased BOD

4. Increased turbidity

4 / 25

4. Municipal sewage is considered highly polluting mainly because:

1. It contains high TDS only

2. It contains pathogens and biodegradable organic matter

3. It contains toxic metals

4. It is acidic in nature

5 / 25

5. Chlorides in wastewater are determined using:

1. Argentometric titration

2. EDTA titration

3. Winkler method

4. Conductivity method

6 / 25

6. BOD measures:
A. Total organic matter
B. Biodegradable organic matter
C. Non-biodegradable organics
D. Inorganic solids

1. A B and C

2. B and C

3. B only

4. A only

7 / 25

7. Which of the following is NOT a physical characteristic of wastewater?

1. Colour

2. BOD

3. Turbidity

4. Temperature

8 / 25

8. High chloride concentration in sewage indicates:

1. Domestic sewage

2. Biological oxidation

3. Seawater intrusion

4. Fresh sewage

9 / 25

9. Suspended solids are best defined as solids which:

1. Are soluble in water

2. Pass through 1 µm filter

3. Settle only after coagulation

4. Are retained by filtration

10 / 25

10. Nitrites are measured using colour development with:

1. Phenol-disulphonic acid

2. EDTA

3. Sulphanilic acid and naphthamine

4. KMnO₄

11 / 25

11. Which statement is always true?

1. COD = BOD

2. BOD > COD

3. COD < DO

4. COD > BOD

12 / 25

12. Particles larger than 10 μm are classified as:
10 माइक्रोन से बड़े कण कहलाते हैं:

1. Settleable solids

2. Colloidal solids

3. Volatile solids

4. Dissolved solids

13 / 25

13. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Total hardness

3. Lesser of total hardness and alkalinity

4. Alkalinity

14 / 25

14. Nephelometer measures turbidity based on light scattered at:
नेफेलोमीटर किस कोण पर बिखरे प्रकाश को मापता है?

1. 90°

2. 0°

3. 45°

4. 180°

15 / 25

15. pH 8.3 in alkalinity titration corresponds to neutralization of:
क्षारीयता टाइट्रेशन में pH 8.3 किसके न्यूट्रलाइज़ेशन को दर्शाता है?

1. Total alkalinity

2. Only carbonate

3. Only bicarbonate

4. OH⁻ and half CO₃²⁻

16 / 25

16. Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as CaCO₃

3. mg/L as CO₃⁻

4. mg/L as HCO₃⁻

17 / 25

17. Standard oxidizing agent used in COD test is: COD परीक्षण में प्रयुक्त मानक ऑक्सीडाइज़र है:

1. KMnO₄

2. K₂Cr₂O₇

3. Chlorine

4. Ozone

18 / 25

18. The major objection of turbidity in water treatment is that it:

1. Reduces hardness

2. Reduce Disinfectants efficiency

3. Increases pH

4. Increases alkalinity

19 / 25

19. Minimum DO required in a river after sewage discharge to protect aquatic life is:
A. 1 mg/L
B. 2 mg/L
C. 4 mg/L
D. 6 mg/L

1. B

2. D

3. A

4. C

20 / 25

20. The optimum pH range for biological wastewater treatment is:

1. 6.5 – 8.5

2. 4.5 – 6.5

3. 8.5 – 10.5

4. 5.5 – 9.5

21 / 25

21. If COD is very high but BOD is very low, wastewater is:
यदि COD अधिक और BOD बहुत कम है, तो अपशिष्ट जल है:

1. Fully treated

2. Non-biodegradable

3. Highly biodegradable

4. Fresh sewage

22 / 25

22. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. No organic matter

3. Incomplete oxidation

4. Fully treated sewage

23 / 25

23. Settleable solids in sewage are measured using:

1. Imhoff cone

2. Nephelometer

3. Conductivity meter

4. EDTA titration

24 / 25

24. Kjeldahl nitrogen represents:
A. Only ammonia nitrogen
B. Only nitrate nitrogen
C. Total nitrogen

1. A B and C

2. A and B

3. A and C

4. B and C

25 / 25

25. The most accurate instrument for measuring low turbidity in drinking water is:

1. Turbidity rod

2. Baylis turbidimeter

3. Nephelometer

4. Jackson’s turbidimeter

Your score is

The average score is 40%

Author

kanwar

Kanwar Bhan Godara
UGC NET JRF Environmental Science

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25 Wastewater Treatment MCQs for RSPCB JSO/JEE | Turbidity, BOD, COD, pH, Alkalinity & More

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