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. Approximate estimation of TDS is commonly done using:

1. Imhoff cone

2. EDTA titration

3. Turbidity

4. Electrical conductivity

2 / 25

2. 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

3 / 25

3. Alkalinity of water is expressed in terms of:

1. mg/L as CaCO₃

2. mg/L as CO₃⁻

3. meq/L as OH⁻

4. mg/L as HCO₃⁻

4 / 25

4. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. Fully treated sewage

3. No organic matter

4. Incomplete oxidation

5 / 25

5. High pH in wastewater mainly causes:

1. Scaling

2. Increased BOD

3. Corrosion

4. Increased turbidity

6 / 25

6. Chlorides in wastewater are determined using:

1. EDTA titration

2. Argentometric titration

3. Winkler method

4. Conductivity method

7 / 25

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

1. Volatile solids

2. Dissolved solids

3. Settleable solids

4. Colloidal solids

8 / 25

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

1. Jackson’s turbidimeter

2. Nephelometer

3. Turbidity rod

4. Baylis turbidimeter

9 / 25

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

1. 5.5 – 9.5

2. 8.5 – 10.5

3. 4.5 – 6.5

4. 6.5 – 8.5

10 / 25

10. High chloride concentration in sewage indicates:

1. Fresh sewage

2. Seawater intrusion

3. Domestic sewage

4. Biological oxidation

11 / 25

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

1. Increases alkalinity

2. Reduces hardness

3. Increases pH

4. Reduce Disinfectants efficiency

12 / 25

12. 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. B

4. C

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 bicarbonate

2. Only carbonate

3. OH⁻ and half CO₃²⁻

4. Total alkalinity

14 / 25

14. Carbonate hardness of water is equal to:

1. Alkalinity

2. Lesser of total hardness and alkalinity

3. Total hardness

4. Non-carbonate hardness

15 / 25

15. 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°

16 / 25

16. 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. Highly biodegradable

4. Moderately biodegradable

17 / 25

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

1. Colour

2. BOD

3. Turbidity

4. Temperature

18 / 25

18. Municipal sewage is considered highly polluting mainly because:

1. It contains toxic metals

2. It is acidic in nature

3. It contains high TDS only

4. It contains pathogens and biodegradable organic matter

19 / 25

19. 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

20 / 25

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

1. A B and C

2. A and B

3. A and C

4. B and C

21 / 25

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

1. KMnO₄

2. Chlorine

3. Ozone

4. K₂Cr₂O₇

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. Fresh sewage

2. Non-biodegradable

3. Highly biodegradable

4. Fully treated

23 / 25

23. Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. EDTA

3. Phenol-disulphonic acid

4. KMnO₄

24 / 25

24. Settleable solids in sewage are measured using:

1. Nephelometer

2. EDTA titration

3. Conductivity meter

4. Imhoff cone

25 / 25

25. Which statement is always true?

1. COD < DO

2. COD > BOD

3. BOD > COD

4. COD = BOD

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. 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. A

2. C

3. D

4. B

2 / 25

2. Alkalinity of water is expressed in terms of:

1. mg/L as CaCO₃

2. mg/L as HCO₃⁻

3. mg/L as CO₃⁻

4. meq/L as OH⁻

3 / 25

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

1. Jackson’s turbidimeter

2. Baylis turbidimeter

3. Turbidity rod

4. Nephelometer

4 / 25

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

1. B and C

2. A and C

3. A B and C

4. A and B

5 / 25

5. Settleable solids in sewage are measured using:

1. Nephelometer

2. EDTA titration

3. Imhoff cone

4. Conductivity meter

6 / 25

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

1. 180°

2. 90°

3. 0°

4. 45°

7 / 25

7. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. No organic matter

3. Fully treated sewage

4. Incomplete oxidation

8 / 25

8. Nitrites are measured using colour development with:

1. KMnO₄

2. EDTA

3. Sulphanilic acid and naphthamine

4. Phenol-disulphonic acid

9 / 25

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

1. Turbidity

2. Colour

3. BOD

4. Temperature

10 / 25

10. Municipal sewage is considered highly polluting mainly because:

1. It contains toxic metals

2. It contains high TDS only

3. It contains pathogens and biodegradable organic matter

4. It is acidic in nature

11 / 25

11. 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 B and C

4. A only

12 / 25

12. 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

13 / 25

13. Approximate estimation of TDS is commonly done using:

1. EDTA titration

2. Electrical conductivity

3. Turbidity

4. Imhoff cone

14 / 25

14. Carbonate hardness of water is equal to:

1. Total hardness

2. Alkalinity

3. Non-carbonate hardness

4. Lesser of total hardness and alkalinity

15 / 25

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

1. K₂Cr₂O₇

2. Ozone

3. KMnO₄

4. Chlorine

16 / 25

16. Which statement is always true?

1. COD > BOD

2. BOD > COD

3. COD < DO

4. COD = BOD

17 / 25

17. High pH in wastewater mainly causes:

1. Increased turbidity

2. Corrosion

3. Scaling

4. Increased BOD

18 / 25

18. 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. OH⁻ and half CO₃²⁻

3. Only carbonate

4. Total alkalinity

19 / 25

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

1. Settleable solids

2. Colloidal solids

3. Dissolved solids

4. Volatile solids

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. Untreatable

2. Highly biodegradable

3. Moderately biodegradable

4. Partially biodegradable

21 / 25

21. Chlorides in wastewater are determined using:

1. Winkler method

2. EDTA titration

3. Conductivity method

4. Argentometric titration

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. Non-biodegradable

2. Highly biodegradable

3. Fully treated

4. Fresh sewage

23 / 25

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

1. 4.5 – 6.5

2. 8.5 – 10.5

3. 6.5 – 8.5

4. 5.5 – 9.5

24 / 25

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

1. Increases pH

2. Reduce Disinfectants efficiency

3. Reduces hardness

4. Increases alkalinity

25 / 25

25. High chloride concentration in sewage indicates:

1. Fresh sewage

2. Biological oxidation

3. Seawater intrusion

4. Domestic sewage

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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