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. 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

2 / 25

2. 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. Fresh sewage

2. Non-biodegradable

3. Fully treated

4. Highly biodegradable

3 / 25

3. Settleable solids in sewage are measured using:

1. Imhoff cone

2. EDTA titration

3. Nephelometer

4. Conductivity meter

4 / 25

4. 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

5 / 25

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

1. A and B

2. B and C

3. A B and C

4. A and C

6 / 25

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

1. Reduce Disinfectants efficiency

2. Reduces hardness

3. Increases alkalinity

4. Increases pH

7 / 25

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

1. Chlorine

2. KMnO₄

3. Ozone

4. K₂Cr₂O₇

8 / 25

8. Nitrites are measured using colour development with:

1. Phenol-disulphonic acid

2. Sulphanilic acid and naphthamine

3. KMnO₄

4. EDTA

9 / 25

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

1. Jackson’s turbidimeter

2. Turbidity rod

3. Baylis turbidimeter

4. Nephelometer

10 / 25

10. High pH in wastewater mainly causes:

1. Increased BOD

2. Increased turbidity

3. Scaling

4. Corrosion

11 / 25

11. Chlorides in wastewater are determined using:

1. Winkler method

2. Conductivity method

3. Argentometric titration

4. EDTA titration

12 / 25

12. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Seawater intrusion

3. Domestic sewage

4. Fresh sewage

13 / 25

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

1. 90°

2. 0°

3. 180°

4. 45°

14 / 25

14. 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

15 / 25

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

1. Moderately biodegradable

2. Untreatable

3. Highly biodegradable

4. Partially biodegradable

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. C

2. B

3. A

4. D

17 / 25

17. Alkalinity of water is expressed in terms of:

1. mg/L as HCO₃⁻

2. meq/L as OH⁻

3. mg/L as CO₃⁻

4. mg/L as CaCO₃

18 / 25

18. Approximate estimation of TDS is commonly done using:

1. Turbidity

2. Electrical conductivity

3. EDTA titration

4. Imhoff cone

19 / 25

19. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Alkalinity

3. Lesser of total hardness and alkalinity

4. Total hardness

20 / 25

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

1. Turbidity

2. Colour

3. BOD

4. Temperature

21 / 25

21. 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

22 / 25

22. Which statement is always true?

1. COD = BOD

2. BOD > COD

3. COD > BOD

4. COD < DO

23 / 25

23. Presence of nitrites in sewage indicates:

1. Fully treated sewage

2. No organic matter

3. Fresh sewage

4. Incomplete oxidation

24 / 25

24. 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

25 / 25

25. 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

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

1. 180°

2. 0°

3. 45°

4. 90°

2 / 25

2. Approximate estimation of TDS is commonly done using:

1. Imhoff cone

2. Electrical conductivity

3. Turbidity

4. EDTA titration

3 / 25

3. 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

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. Fresh sewage

2. Non-biodegradable

3. Highly biodegradable

4. Fully treated

5 / 25

5. Nitrites are measured using colour development with:

1. Phenol-disulphonic acid

2. EDTA

3. KMnO₄

4. Sulphanilic acid and naphthamine

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 bicarbonate

3. Only carbonate

4. Total alkalinity

7 / 25

7. 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⁻

8 / 25

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

1. Turbidity rod

2. Jackson’s turbidimeter

3. Nephelometer

4. Baylis turbidimeter

9 / 25

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

1. Reduce Disinfectants efficiency

2. Increases alkalinity

3. Increases pH

4. Reduces hardness

10 / 25

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

1. Dissolved solids

2. Colloidal solids

3. Settleable solids

4. Volatile solids

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. C

2. D

3. A

4. B

12 / 25

12. Settleable solids in sewage are measured using:

1. Conductivity meter

2. Nephelometer

3. EDTA titration

4. Imhoff cone

13 / 25

13. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. Fully treated sewage

3. No organic matter

4. Incomplete oxidation

14 / 25

14. Municipal sewage is considered highly polluting mainly because:

1. It is acidic in nature

2. It contains pathogens and biodegradable organic matter

3. It contains toxic metals

4. It contains high TDS only

15 / 25

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

1. 6.5 – 8.5

2. 4.5 – 6.5

3. 5.5 – 9.5

4. 8.5 – 10.5

16 / 25

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

1. A and C

2. A and B

3. B and C

4. A B and C

17 / 25

17. High chloride concentration in sewage indicates:

1. Fresh sewage

2. Seawater intrusion

3. Domestic sewage

4. Biological oxidation

18 / 25

18. 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. B and C

4. A only

19 / 25

19. Chlorides in wastewater are determined using:

1. Winkler method

2. EDTA titration

3. Argentometric titration

4. Conductivity method

20 / 25

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

1. Moderately biodegradable

2. Partially biodegradable

3. Highly biodegradable

4. Untreatable

21 / 25

21. Which statement is always true?

1. COD = BOD

2. BOD > COD

3. COD > BOD

4. COD < DO

22 / 25

22. High pH in wastewater mainly causes:

1. Scaling

2. Increased turbidity

3. Increased BOD

4. Corrosion

23 / 25

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

1. K₂Cr₂O₇

2. KMnO₄

3. Chlorine

4. Ozone

24 / 25

24. Carbonate hardness of water is equal to:

1. Alkalinity

2. Non-carbonate hardness

3. Lesser of total hardness and alkalinity

4. Total hardness

25 / 25

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

1. Colour

2. BOD

3. Temperature

4. Turbidity

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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