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. The optimum pH range for biological wastewater treatment is:

1. 4.5 – 6.5

2. 8.5 – 10.5

3. 5.5 – 9.5

4. 6.5 – 8.5

2 / 25

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

1. B and C

2. A B and C

3. A and B

4. A and C

3 / 25

3. 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

4 / 25

4. Carbonate hardness of water is equal to:

1. Alkalinity

2. Non-carbonate hardness

3. Lesser of total hardness and alkalinity

4. Total hardness

5 / 25

5. 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. D

4. A

6 / 25

6. High pH in wastewater mainly causes:

1. Increased BOD

2. Scaling

3. Increased turbidity

4. Corrosion

7 / 25

7. 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. B and C

4. A only

8 / 25

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

1. Increases pH

2. Reduce Disinfectants efficiency

3. Reduces hardness

4. Increases alkalinity

9 / 25

9. 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°

10 / 25

10. Which statement is always true?

1. COD = BOD

2. COD > BOD

3. COD < DO

4. BOD > COD

11 / 25

11. 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. Fresh sewage

4. Non-biodegradable

12 / 25

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

1. Chlorine

2. KMnO₄

3. Ozone

4. K₂Cr₂O₇

13 / 25

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

1. Jackson’s turbidimeter

2. Baylis turbidimeter

3. Nephelometer

4. Turbidity rod

14 / 25

14. 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

15 / 25

15. Nitrites are measured using colour development with:

1. KMnO₄

2. Phenol-disulphonic acid

3. EDTA

4. Sulphanilic acid and naphthamine

16 / 25

16. High chloride concentration in sewage indicates:

1. Domestic sewage

2. Seawater intrusion

3. Biological oxidation

4. Fresh sewage

17 / 25

17. 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

18 / 25

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

1. BOD

2. Temperature

3. Colour

4. Turbidity

19 / 25

19. Presence of nitrites in sewage indicates:

1. Fully treated sewage

2. Fresh sewage

3. No organic matter

4. Incomplete oxidation

20 / 25

20. Chlorides in wastewater are determined using:

1. EDTA titration

2. Conductivity method

3. Winkler method

4. Argentometric titration

21 / 25

21. Settleable solids in sewage are measured using:

1. EDTA titration

2. Imhoff cone

3. Nephelometer

4. Conductivity meter

22 / 25

22. Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as CO₃⁻

3. mg/L as CaCO₃

4. mg/L as HCO₃⁻

23 / 25

23. 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. Total alkalinity

4. OH⁻ and half CO₃²⁻

24 / 25

24. Approximate estimation of TDS is commonly done using:

1. Turbidity

2. Imhoff cone

3. Electrical conductivity

4. EDTA titration

25 / 25

25. 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. Moderately biodegradable

3. Highly biodegradable

4. Partially biodegradable

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. 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

2 / 25

2. Approximate estimation of TDS is commonly done using:

1. Imhoff cone

2. Turbidity

3. Electrical conductivity

4. EDTA titration

3 / 25

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

1. Nephelometer

2. Jackson’s turbidimeter

3. Baylis turbidimeter

4. Turbidity rod

4 / 25

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

1. Chlorine

2. KMnO₄

3. K₂Cr₂O₇

4. Ozone

5 / 25

5. Alkalinity of water is expressed in terms of:

1. mg/L as CaCO₃

2. meq/L as OH⁻

3. mg/L as CO₃⁻

4. mg/L as HCO₃⁻

6 / 25

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

1. Increases pH

2. Increases alkalinity

3. Reduce Disinfectants efficiency

4. Reduces hardness

7 / 25

7. 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. Untreatable

3. Partially biodegradable

4. Moderately biodegradable

8 / 25

8. Chlorides in wastewater are determined using:

1. Winkler method

2. Argentometric titration

3. Conductivity method

4. EDTA titration

9 / 25

9. 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. Fresh sewage

4. Fully treated

10 / 25

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

1. Turbidity

2. Temperature

3. Colour

4. BOD

11 / 25

11. Settleable solids in sewage are measured using:

1. Nephelometer

2. Conductivity meter

3. EDTA titration

4. Imhoff cone

12 / 25

12. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. No organic matter

3. Incomplete oxidation

4. Fully treated sewage

13 / 25

13. Suspended solids are best defined as solids which:

1. Are retained by filtration

2. Settle only after coagulation

3. Are soluble in water

4. Pass through 1 µm filter

14 / 25

14. 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

15 / 25

15. High pH in wastewater mainly causes:

1. Scaling

2. Corrosion

3. Increased BOD

4. Increased turbidity

16 / 25

16. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Seawater intrusion

3. Fresh sewage

4. Domestic sewage

17 / 25

17. Which statement is always true?

1. COD < DO

2. COD > BOD

3. BOD > COD

4. COD = BOD

18 / 25

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

1. Dissolved solids

2. Settleable solids

3. Colloidal solids

4. Volatile solids

19 / 25

19. 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

20 / 25

20. Nitrites are measured using colour development with:

1. EDTA

2. Phenol-disulphonic acid

3. KMnO₄

4. Sulphanilic acid and naphthamine

21 / 25

21. Carbonate hardness of water is equal to:

1. Lesser of total hardness and alkalinity

2. Non-carbonate hardness

3. Total hardness

4. Alkalinity

22 / 25

22. 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

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. Municipal sewage is considered highly polluting mainly because:

1. It contains toxic metals

2. It is acidic in nature

3. It contains pathogens and biodegradable organic matter

4. It contains high TDS only

25 / 25

25. 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

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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