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

1. Ozone

2. K₂Cr₂O₇

3. KMnO₄

4. Chlorine

2 / 25

2. 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°

3 / 25

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

1. Jackson’s turbidimeter

2. Baylis turbidimeter

3. Nephelometer

4. Turbidity rod

4 / 25

4. 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. Non-biodegradable

3. Fresh sewage

4. Fully treated

5 / 25

5. High pH in wastewater mainly causes:

1. Increased turbidity

2. Scaling

3. Increased BOD

4. Corrosion

6 / 25

6. 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

7 / 25

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

1. A B and C

2. B only

3. B and C

4. A only

8 / 25

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

1. Temperature

2. Colour

3. BOD

4. Turbidity

9 / 25

9. Alkalinity of water is expressed in terms of:

1. mg/L as CO₃⁻

2. mg/L as CaCO₃

3. mg/L as HCO₃⁻

4. meq/L as OH⁻

10 / 25

10. Chlorides in wastewater are determined using:

1. Conductivity method

2. EDTA titration

3. Argentometric titration

4. Winkler method

11 / 25

11. 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

12 / 25

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

1. 8.5 – 10.5

2. 5.5 – 9.5

3. 4.5 – 6.5

4. 6.5 – 8.5

13 / 25

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

1. Only carbonate

2. Only bicarbonate

3. OH⁻ and half CO₃²⁻

4. Total alkalinity

14 / 25

14. Nitrites are measured using colour development with:

1. KMnO₄

2. Phenol-disulphonic acid

3. EDTA

4. Sulphanilic acid and naphthamine

15 / 25

15. High chloride concentration in sewage indicates:

1. Seawater intrusion

2. Biological oxidation

3. Fresh sewage

4. Domestic sewage

16 / 25

16. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Lesser of total hardness and alkalinity

3. Total hardness

4. Alkalinity

17 / 25

17. Municipal sewage is considered highly polluting mainly because:

1. It contains high TDS only

2. It contains toxic metals

3. It contains pathogens and biodegradable organic matter

4. It is acidic in nature

18 / 25

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

1. Volatile solids

2. Settleable solids

3. Dissolved solids

4. Colloidal solids

19 / 25

19. Settleable solids in sewage are measured using:

1. Conductivity meter

2. Imhoff cone

3. Nephelometer

4. EDTA titration

20 / 25

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

1. Reduces hardness

2. Increases pH

3. Increases alkalinity

4. Reduce Disinfectants efficiency

21 / 25

21. Approximate estimation of TDS is commonly done using:

1. Imhoff cone

2. Turbidity

3. Electrical conductivity

4. EDTA titration

22 / 25

22. 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. Moderately biodegradable

3. Untreatable

4. Partially biodegradable

23 / 25

23. Suspended solids are best defined as solids which:

1. Are retained by filtration

2. Are soluble in water

3. Settle only after coagulation

4. Pass through 1 µm filter

24 / 25

24. Which statement is always true?

1. COD = BOD

2. COD < DO

3. COD > BOD

4. BOD > COD

25 / 25

25. Presence of nitrites in sewage indicates:

1. No organic matter

2. Fully treated sewage

3. Fresh sewage

4. Incomplete oxidation

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. High pH in wastewater mainly causes:

1. Increased BOD

2. Increased turbidity

3. Corrosion

4. Scaling

2 / 25

2. Nitrites are measured using colour development with:

1. Phenol-disulphonic acid

2. EDTA

3. Sulphanilic acid and naphthamine

4. KMnO₄

3 / 25

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

1. Increases pH

2. Reduces hardness

3. Reduce Disinfectants efficiency

4. Increases alkalinity

4 / 25

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

1. A B and C

2. B only

3. A only

4. B and C

5 / 25

5. 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. Total alkalinity

3. Only bicarbonate

4. Only carbonate

6 / 25

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

1. Turbidity

2. BOD

3. Temperature

4. Colour

7 / 25

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

1. 45°

2. 0°

3. 90°

4. 180°

8 / 25

8. Chlorides in wastewater are determined using:

1. Conductivity method

2. Argentometric titration

3. EDTA titration

4. Winkler method

9 / 25

9. Settleable solids in sewage are measured using:

1. Nephelometer

2. EDTA titration

3. Conductivity meter

4. Imhoff cone

10 / 25

10. Municipal sewage is considered highly polluting mainly because:

1. It is acidic in nature

2. It contains high TDS only

3. It contains pathogens and biodegradable organic matter

4. It contains toxic metals

11 / 25

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

1. 4.5 – 6.5

2. 5.5 – 9.5

3. 6.5 – 8.5

4. 8.5 – 10.5

12 / 25

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

1. A B and C

2. B and C

3. A and B

4. A and C

13 / 25

13. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Fresh sewage

3. Domestic sewage

4. Seawater intrusion

14 / 25

14. Suspended solids are best defined as solids which:

1. Pass through 1 µm filter

2. Are soluble in water

3. Settle only after coagulation

4. Are retained by filtration

15 / 25

15. Carbonate hardness of water is equal to:

1. Total hardness

2. Alkalinity

3. Lesser of total hardness and alkalinity

4. Non-carbonate hardness

16 / 25

16. 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. C

3. A

4. D

17 / 25

17. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. Turbidity

3. EDTA titration

4. Imhoff cone

18 / 25

18. Presence of nitrites in sewage indicates:

1. Incomplete oxidation

2. Fresh sewage

3. Fully treated sewage

4. No organic matter

19 / 25

19. 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. Untreatable

3. Moderately biodegradable

4. Partially biodegradable

20 / 25

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

1. Ozone

2. KMnO₄

3. Chlorine

4. K₂Cr₂O₇

21 / 25

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

1. Colloidal solids

2. Dissolved solids

3. Settleable solids

4. Volatile solids

22 / 25

22. 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. Fresh sewage

4. Highly biodegradable

23 / 25

23. Which statement is always true?

1. COD > BOD

2. BOD > COD

3. COD < DO

4. COD = BOD

24 / 25

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

1. Turbidity rod

2. Nephelometer

3. Baylis turbidimeter

4. Jackson’s turbidimeter

25 / 25

25. Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as CO₃⁻

3. mg/L as CaCO₃

4. mg/L as HCO₃⁻

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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