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. 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

2 / 25

2. Approximate estimation of TDS is commonly done using:

1. EDTA titration

2. Turbidity

3. Imhoff cone

4. Electrical conductivity

3 / 25

3. Presence of nitrites in sewage indicates:

1. Incomplete oxidation

2. Fully treated sewage

3. No organic matter

4. Fresh sewage

4 / 25

4. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Total hardness

3. Alkalinity

4. Lesser of total hardness and alkalinity

5 / 25

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

1. Jackson’s turbidimeter

2. Turbidity rod

3. Baylis turbidimeter

4. Nephelometer

6 / 25

6. 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

7 / 25

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

1. KMnO₄

2. Chlorine

3. K₂Cr₂O₇

4. Ozone

8 / 25

8. 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

9 / 25

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

1. Dissolved solids

2. Volatile solids

3. Settleable solids

4. Colloidal solids

10 / 25

10. Chlorides in wastewater are determined using:

1. Argentometric titration

2. Conductivity method

3. EDTA titration

4. Winkler method

11 / 25

11. 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. OH⁻ and half CO₃²⁻

4. Only carbonate

12 / 25

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

1. Increases pH

2. Increases alkalinity

3. Reduces hardness

4. Reduce Disinfectants efficiency

13 / 25

13. Suspended solids are best defined as solids which:

1. Are soluble in water

2. Settle only after coagulation

3. Are retained by filtration

4. Pass through 1 µm filter

14 / 25

14. Alkalinity of water is expressed in terms of:

1. mg/L as CO₃⁻

2. mg/L as HCO₃⁻

3. meq/L as OH⁻

4. mg/L as CaCO₃

15 / 25

15. Settleable solids in sewage are measured using:

1. Imhoff cone

2. Nephelometer

3. EDTA titration

4. Conductivity meter

16 / 25

16. Municipal sewage is considered highly polluting mainly because:

1. It contains pathogens and biodegradable organic matter

2. It is acidic in nature

3. It contains toxic metals

4. It contains high TDS only

17 / 25

17. 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

18 / 25

18. Which statement is always true?

1. COD = BOD

2. COD < DO

3. COD > BOD

4. BOD > COD

19 / 25

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

1. BOD

2. Temperature

3. Turbidity

4. Colour

20 / 25

20. Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. Phenol-disulphonic acid

3. KMnO₄

4. EDTA

21 / 25

21. 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

22 / 25

22. High pH in wastewater mainly causes:

1. Corrosion

2. Scaling

3. Increased turbidity

4. Increased BOD

23 / 25

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

1. 180°

2. 0°

3. 90°

4. 45°

24 / 25

24. High chloride concentration in sewage indicates:

1. Fresh sewage

2. Domestic sewage

3. Biological oxidation

4. Seawater intrusion

25 / 25

25. 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. Fully treated

4. Fresh sewage

Your score is

The average score is 42%

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Quiz: Physical Chemical and Biological Characteristics of Water

25 Qs Time: 15 Minut

1 / 25

1. High chloride concentration in sewage indicates:

1. Domestic sewage

2. Fresh sewage

3. Biological oxidation

4. Seawater intrusion

2 / 25

2. 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

3 / 25

3. Suspended solids are best defined as solids which:

1. Settle only after coagulation

2. Are soluble in water

3. Pass through 1 µm filter

4. Are retained by filtration

4 / 25

4. 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. Highly biodegradable

3. Partially biodegradable

4. Moderately biodegradable

5 / 25

5. Chlorides in wastewater are determined using:

1. Conductivity method

2. EDTA titration

3. Argentometric titration

4. Winkler method

6 / 25

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

1. Baylis turbidimeter

2. Nephelometer

3. Jackson’s turbidimeter

4. Turbidity rod

7 / 25

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

1. A only

2. B only

3. B and C

4. A B and C

8 / 25

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

1. 180°

2. 45°

3. 90°

4. 0°

9 / 25

9. 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

10 / 25

10. Settleable solids in sewage are measured using:

1. Conductivity meter

2. EDTA titration

3. Nephelometer

4. Imhoff cone

11 / 25

11. Presence of nitrites in sewage indicates:

1. Fully treated sewage

2. No organic matter

3. Fresh sewage

4. Incomplete oxidation

12 / 25

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

1. Dissolved solids

2. Settleable solids

3. Volatile solids

4. Colloidal solids

13 / 25

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

1. Increases pH

2. Reduces hardness

3. Reduce Disinfectants efficiency

4. Increases alkalinity

14 / 25

14. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. Turbidity

3. Imhoff cone

4. EDTA titration

15 / 25

15. 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

16 / 25

16. Nitrites are measured using colour development with:

1. Phenol-disulphonic acid

2. EDTA

3. Sulphanilic acid and naphthamine

4. KMnO₄

17 / 25

17. High pH in wastewater mainly causes:

1. Scaling

2. Increased turbidity

3. Corrosion

4. Increased BOD

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. Fresh sewage

3. Highly biodegradable

4. Non-biodegradable

19 / 25

19. Which statement is always true?

1. BOD > COD

2. COD < DO

3. COD > BOD

4. COD = BOD

20 / 25

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

1. BOD

2. Turbidity

3. Colour

4. Temperature

21 / 25

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

1. A and C

2. B and C

3. A B and C

4. A and B

22 / 25

22. Carbonate hardness of water is equal to:

1. Lesser of total hardness and alkalinity

2. Total hardness

3. Alkalinity

4. Non-carbonate hardness

23 / 25

23. 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. B

4. A

24 / 25

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

1. Ozone

2. K₂Cr₂O₇

3. Chlorine

4. KMnO₄

25 / 25

25. 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

Your score is

The average score is 42%

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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