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. 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

2 / 25

2. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Domestic sewage

3. Seawater intrusion

4. Fresh sewage

3 / 25

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

1. BOD

2. Turbidity

3. Colour

4. Temperature

4 / 25

4. Presence of nitrites in sewage indicates:

1. No organic matter

2. Incomplete oxidation

3. Fully treated sewage

4. Fresh sewage

5 / 25

5. Chlorides in wastewater are determined using:

1. Conductivity method

2. Winkler method

3. Argentometric titration

4. EDTA titration

6 / 25

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

1. 0°

2. 90°

3. 45°

4. 180°

7 / 25

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

1. KMnO₄

2. Chlorine

3. Ozone

4. K₂Cr₂O₇

8 / 25

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

1. Nephelometer

2. Baylis turbidimeter

3. Jackson’s turbidimeter

4. Turbidity rod

9 / 25

9. Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. Phenol-disulphonic acid

3. KMnO₄

4. EDTA

10 / 25

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

1. Increases alkalinity

2. Reduce Disinfectants efficiency

3. Reduces hardness

4. Increases pH

11 / 25

11. Settleable solids in sewage are measured using:

1. Conductivity meter

2. Nephelometer

3. EDTA titration

4. Imhoff cone

12 / 25

12. Approximate estimation of TDS is commonly done using:

1. Turbidity

2. EDTA titration

3. Imhoff cone

4. Electrical conductivity

13 / 25

13. Carbonate hardness of water is equal to:

1. Total hardness

2. Non-carbonate hardness

3. Alkalinity

4. Lesser of total hardness and alkalinity

14 / 25

14. Alkalinity of water is expressed in terms of:

1. mg/L as CO₃⁻

2. mg/L as HCO₃⁻

3. mg/L as CaCO₃

4. meq/L as OH⁻

15 / 25

15. Which statement is always true?

1. COD < DO

2. BOD > COD

3. COD > BOD

4. COD = BOD

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. D

2. A

3. C

4. B

17 / 25

17. Suspended solids are best defined as solids which:

1. Settle only after coagulation

2. Are soluble in water

3. Are retained by filtration

4. Pass through 1 µm filter

18 / 25

18. 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. Highly biodegradable

3. Fresh sewage

4. Non-biodegradable

19 / 25

19. Municipal sewage is considered highly polluting mainly because:

1. It contains toxic metals

2. It is acidic in nature

3. It contains pathogens and biodegradable organic matter

4. It contains high TDS only

20 / 25

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

1. Only bicarbonate

2. Total alkalinity

3. Only carbonate

4. OH⁻ and half CO₃²⁻

21 / 25

21. 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

22 / 25

22. 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

23 / 25

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

1. B only

2. B and C

3. A only

4. A B and C

24 / 25

24. High pH in wastewater mainly causes:

1. Corrosion

2. Increased turbidity

3. Increased BOD

4. Scaling

25 / 25

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

1. Untreatable

2. Partially biodegradable

3. Highly biodegradable

4. Moderately biodegradable

Your score is

The average score is 37%

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Quiz: Physical Chemical and Biological Characteristics of Water

25 Qs Time: 15 Minut

1 / 25

1. Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as CaCO₃

3. mg/L as HCO₃⁻

4. mg/L as CO₃⁻

2 / 25

2. Settleable solids in sewage are measured using:

1. Imhoff cone

2. Conductivity meter

3. Nephelometer

4. EDTA titration

3 / 25

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

1. Turbidity rod

2. Jackson’s turbidimeter

3. Nephelometer

4. Baylis turbidimeter

4 / 25

4. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Domestic sewage

3. Fresh sewage

4. Seawater intrusion

5 / 25

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

1. Reduces hardness

2. Increases pH

3. Increases alkalinity

4. Reduce Disinfectants efficiency

6 / 25

6. Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. EDTA

3. Phenol-disulphonic acid

4. KMnO₄

7 / 25

7. Municipal sewage is considered highly polluting mainly because:

1. It is acidic in nature

2. It contains toxic metals

3. It contains pathogens and biodegradable organic matter

4. It contains high TDS only

8 / 25

8. 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. Partially biodegradable

4. Moderately biodegradable

9 / 25

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

1. A B and C

2. A and C

3. B and C

4. A and B

10 / 25

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

1. 90°

2. 180°

3. 45°

4. 0°

11 / 25

11. High pH in wastewater mainly causes:

1. Corrosion

2. Increased BOD

3. Scaling

4. Increased turbidity

12 / 25

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

1. Chlorine

2. KMnO₄

3. Ozone

4. K₂Cr₂O₇

13 / 25

13. Chlorides in wastewater are determined using:

1. Argentometric titration

2. Conductivity method

3. Winkler method

4. EDTA titration

14 / 25

14. Carbonate hardness of water is equal to:

1. Alkalinity

2. Lesser of total hardness and alkalinity

3. Non-carbonate hardness

4. Total hardness

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. Only carbonate

2. OH⁻ and half CO₃²⁻

3. Only bicarbonate

4. Total alkalinity

16 / 25

16. Suspended solids are best defined as solids which:

1. Are retained by filtration

2. Are soluble in water

3. Pass through 1 µm filter

4. Settle only after coagulation

17 / 25

17. 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. Highly biodegradable

3. Non-biodegradable

4. Fresh sewage

18 / 25

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

1. 8.5 – 10.5

2. 6.5 – 8.5

3. 5.5 – 9.5

4. 4.5 – 6.5

19 / 25

19. Which statement is always true?

1. COD = BOD

2. COD < DO

3. BOD > COD

4. COD > BOD

20 / 25

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

1. Colloidal solids

2. Volatile solids

3. Settleable solids

4. Dissolved solids

21 / 25

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

1. A B and C

2. A only

3. B and C

4. B only

22 / 25

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

1. Temperature

2. Turbidity

3. BOD

4. Colour

23 / 25

23. Approximate estimation of TDS is commonly done using:

1. Turbidity

2. Electrical conductivity

3. EDTA titration

4. Imhoff cone

24 / 25

24. 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. A

3. C

4. D

25 / 25

25. Presence of nitrites in sewage indicates:

1. Fully treated sewage

2. Incomplete oxidation

3. Fresh sewage

4. No organic matter

Your score is

The average score is 37%

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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