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

1. 45°

2. 180°

3. 90°

4. 0°

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. Only carbonate

2. Only bicarbonate

3. OH⁻ and half CO₃²⁻

4. Total alkalinity

3 / 25

3. 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

4 / 25

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

1. BOD

2. Temperature

3. Colour

4. Turbidity

5 / 25

5. Chlorides in wastewater are determined using:

1. EDTA titration

2. Conductivity method

3. Winkler method

4. Argentometric titration

6 / 25

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

1. Reduce Disinfectants efficiency

2. Increases alkalinity

3. Reduces hardness

4. Increases pH

7 / 25

7. Settleable solids in sewage are measured using:

1. Nephelometer

2. Conductivity meter

3. EDTA titration

4. Imhoff cone

8 / 25

8. 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. D

3. A

4. C

9 / 25

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

1. Chlorine

2. Ozone

3. KMnO₄

4. K₂Cr₂O₇

10 / 25

10. Suspended solids are best defined as solids which:

1. Pass through 1 µm filter

2. Settle only after coagulation

3. Are soluble in water

4. Are retained by filtration

11 / 25

11. Carbonate hardness of water is equal to:

1. Alkalinity

2. Total hardness

3. Lesser of total hardness and alkalinity

4. Non-carbonate hardness

12 / 25

12. High pH in wastewater mainly causes:

1. Scaling

2. Corrosion

3. Increased turbidity

4. Increased BOD

13 / 25

13. 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

14 / 25

14. Alkalinity of water is expressed in terms of:

1. mg/L as HCO₃⁻

2. mg/L as CO₃⁻

3. meq/L as OH⁻

4. mg/L as CaCO₃

15 / 25

15. Which statement is always true?

1. COD > BOD

2. BOD > COD

3. COD < DO

4. COD = BOD

16 / 25

16. Nitrites are measured using colour development with:

1. KMnO₄

2. Phenol-disulphonic acid

3. Sulphanilic acid and naphthamine

4. EDTA

17 / 25

17. Approximate estimation of TDS is commonly done using:

1. Turbidity

2. Imhoff cone

3. EDTA titration

4. Electrical conductivity

18 / 25

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

1. B and C

2. A B and C

3. B only

4. A only

19 / 25

19. Presence of nitrites in sewage indicates:

1. Incomplete oxidation

2. Fresh sewage

3. Fully treated sewage

4. No organic matter

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. Highly biodegradable

2. Partially biodegradable

3. Untreatable

4. Moderately biodegradable

21 / 25

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

1. Nephelometer

2. Baylis turbidimeter

3. Turbidity rod

4. Jackson’s turbidimeter

22 / 25

22. 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

23 / 25

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

1. 4.5 – 6.5

2. 6.5 – 8.5

3. 5.5 – 9.5

4. 8.5 – 10.5

24 / 25

24. 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 high TDS only

4. It contains toxic metals

25 / 25

25. High chloride concentration in sewage indicates:

1. Fresh sewage

2. Biological oxidation

3. Domestic sewage

4. Seawater intrusion

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. Presence of nitrites in sewage indicates:

1. Incomplete oxidation

2. Fresh sewage

3. No organic matter

4. Fully treated sewage

2 / 25

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

1. K₂Cr₂O₇

2. KMnO₄

3. Chlorine

4. Ozone

3 / 25

3. 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

4 / 25

4. High pH in wastewater mainly causes:

1. Increased BOD

2. Increased turbidity

3. Corrosion

4. Scaling

5 / 25

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

1. Turbidity

2. Colour

3. Temperature

4. BOD

6 / 25

6. 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. Partially biodegradable

4. Highly biodegradable

7 / 25

7. Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as HCO₃⁻

3. mg/L as CO₃⁻

4. mg/L as CaCO₃

8 / 25

8. Chlorides in wastewater are determined using:

1. EDTA titration

2. Argentometric titration

3. Conductivity method

4. Winkler method

9 / 25

9. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Fresh sewage

3. Domestic sewage

4. Seawater intrusion

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

1. 45°

2. 90°

3. 180°

4. 0°

12 / 25

12. Approximate estimation of TDS is commonly done using:

1. EDTA titration

2. Imhoff cone

3. Electrical conductivity

4. Turbidity

13 / 25

13. 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. A

3. D

4. B

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

1. Turbidity rod

2. Baylis turbidimeter

3. Jackson’s turbidimeter

4. Nephelometer

16 / 25

16. Settleable solids in sewage are measured using:

1. Nephelometer

2. Imhoff cone

3. EDTA titration

4. Conductivity meter

17 / 25

17. Nitrites are measured using colour development with:

1. KMnO₄

2. Phenol-disulphonic acid

3. EDTA

4. Sulphanilic acid and naphthamine

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 only

3. B and C

4. A B and C

19 / 25

19. 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

20 / 25

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

1. Reduce Disinfectants efficiency

2. Reduces hardness

3. Increases alkalinity

4. Increases pH

21 / 25

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

1. A B and C

2. A and C

3. A and B

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. 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. Highly biodegradable

3. Fully treated

4. Non-biodegradable

24 / 25

24. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Total hardness

3. Alkalinity

4. Lesser of total hardness and alkalinity

25 / 25

25. Municipal sewage is considered highly polluting mainly because:

1. It is acidic in nature

2. It contains high TDS only

3. It contains pathogens and biodegradable organic matter

4. It contains toxic metals

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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