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. Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. EDTA

3. Phenol-disulphonic acid

4. KMnO₄

2 / 25

2. Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as HCO₃⁻

3. mg/L as CaCO₃

4. mg/L as CO₃⁻

3 / 25

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

1. A and B

2. A B and C

3. B and C

4. A and C

4 / 25

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

1. Colour

2. BOD

3. Turbidity

4. Temperature

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. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. EDTA titration

3. Imhoff cone

4. Turbidity

7 / 25

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

1. Colloidal solids

2. Settleable solids

3. Dissolved solids

4. Volatile solids

8 / 25

8. Chlorides in wastewater are determined using:

1. Argentometric titration

2. Conductivity method

3. Winkler method

4. EDTA titration

9 / 25

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

1. Nephelometer

2. Baylis turbidimeter

3. Jackson’s turbidimeter

4. Turbidity rod

10 / 25

10. 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. Moderately biodegradable

3. Untreatable

4. Highly biodegradable

11 / 25

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

1. Reduces hardness

2. Reduce Disinfectants efficiency

3. Increases pH

4. Increases alkalinity

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. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Domestic sewage

3. Seawater intrusion

4. Fresh sewage

14 / 25

14. Municipal sewage is considered highly polluting mainly because:

1. It contains pathogens and biodegradable organic matter

2. It contains toxic metals

3. It contains high TDS only

4. It is acidic in nature

15 / 25

15. Presence of nitrites in sewage indicates:

1. No organic matter

2. Incomplete oxidation

3. Fully treated sewage

4. Fresh sewage

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. D

4. A

17 / 25

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

1. Ozone

2. KMnO₄

3. K₂Cr₂O₇

4. Chlorine

18 / 25

18. High pH in wastewater mainly causes:

1. Scaling

2. Corrosion

3. Increased turbidity

4. Increased BOD

19 / 25

19. 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. Non-biodegradable

2. Fully treated

3. Highly biodegradable

4. Fresh sewage

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. Total alkalinity

2. Only carbonate

3. OH⁻ and half CO₃²⁻

4. Only bicarbonate

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. B only

3. A only

4. B and C

22 / 25

22. Which statement is always true?

1. COD > BOD

2. BOD > COD

3. COD = BOD

4. COD < DO

23 / 25

23. Settleable solids in sewage are measured using:

1. EDTA titration

2. Nephelometer

3. Conductivity meter

4. Imhoff cone

24 / 25

24. Suspended solids are best defined as solids which:

1. Are soluble in water

2. Are retained by filtration

3. Settle only after coagulation

4. Pass through 1 µm filter

25 / 25

25. Carbonate hardness of water is equal to:

1. Total hardness

2. Lesser of total hardness and alkalinity

3. Non-carbonate hardness

4. Alkalinity

Your score is

The average score is 39%

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Quiz: Physical Chemical and Biological Characteristics of Water

25 Qs Time: 15 Minut

1 / 25

1. Suspended solids are best defined as solids which:

1. Are retained by filtration

2. Settle only after coagulation

3. Pass through 1 µm filter

4. Are soluble in water

2 / 25

2. Alkalinity of water is expressed in terms of:

1. mg/L as CO₃⁻

2. mg/L as CaCO₃

3. meq/L as OH⁻

4. mg/L as HCO₃⁻

3 / 25

3. 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 C

4. A and B

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 is acidic in nature

4. It contains toxic metals

5 / 25

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

1. Colloidal solids

2. Settleable solids

3. Volatile solids

4. Dissolved solids

6 / 25

6. 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

7 / 25

7. Presence of nitrites in sewage indicates:

1. Fully treated sewage

2. Incomplete oxidation

3. Fresh sewage

4. No organic matter

8 / 25

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

1. KMnO₄

2. Chlorine

3. Ozone

4. K₂Cr₂O₇

9 / 25

9. Nitrites are measured using colour development with:

1. Phenol-disulphonic acid

2. EDTA

3. Sulphanilic acid and naphthamine

4. KMnO₄

10 / 25

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

1. Nephelometer

2. Jackson’s turbidimeter

3. Turbidity rod

4. Baylis turbidimeter

11 / 25

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

1. Temperature

2. Turbidity

3. BOD

4. Colour

12 / 25

12. 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. Untreatable

3. Moderately biodegradable

4. Highly biodegradable

13 / 25

13. High chloride concentration in sewage indicates:

1. Seawater intrusion

2. Domestic sewage

3. Fresh sewage

4. Biological oxidation

14 / 25

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

1. 90°

2. 180°

3. 0°

4. 45°

15 / 25

15. 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. B

3. A

4. C

16 / 25

16. 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

17 / 25

17. 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

18 / 25

18. High pH in wastewater mainly causes:

1. Increased BOD

2. Scaling

3. Corrosion

4. Increased turbidity

19 / 25

19. Carbonate hardness of water is equal to:

1. Alkalinity

2. Non-carbonate hardness

3. Total hardness

4. Lesser of total hardness and alkalinity

20 / 25

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

1. Increases alkalinity

2. Increases pH

3. Reduce Disinfectants efficiency

4. Reduces hardness

21 / 25

21. Settleable solids in sewage are measured using:

1. Imhoff cone

2. EDTA titration

3. Conductivity meter

4. Nephelometer

22 / 25

22. Chlorides in wastewater are determined using:

1. Winkler method

2. Conductivity method

3. Argentometric titration

4. EDTA titration

23 / 25

23. Which statement is always true?

1. COD > BOD

2. BOD > COD

3. COD < DO

4. COD = BOD

24 / 25

24. Approximate estimation of TDS is commonly done using:

1. Imhoff cone

2. Electrical conductivity

3. Turbidity

4. EDTA titration

25 / 25

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

1. 4.5 – 6.5

2. 5.5 – 9.5

3. 8.5 – 10.5

4. 6.5 – 8.5

Your score is

The average score is 39%

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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