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

1. Colloidal solids

2. Volatile solids

3. Settleable solids

4. Dissolved solids

2 / 25

2. 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

3 / 25

3. Carbonate hardness of water is equal to:

1. Total hardness

2. Lesser of total hardness and alkalinity

3. Alkalinity

4. Non-carbonate hardness

4 / 25

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

1. KMnO₄

2. Chlorine

3. K₂Cr₂O₇

4. Ozone

5 / 25

5. Chlorides in wastewater are determined using:

1. Winkler method

2. EDTA titration

3. Conductivity method

4. Argentometric titration

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. 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

8 / 25

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

1. Turbidity rod

2. Nephelometer

3. Baylis turbidimeter

4. Jackson’s turbidimeter

9 / 25

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

1. BOD

2. Turbidity

3. Colour

4. Temperature

10 / 25

10. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. Turbidity

3. Imhoff cone

4. EDTA titration

11 / 25

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

1. Reduces hardness

2. Increases pH

3. Reduce Disinfectants efficiency

4. Increases alkalinity

12 / 25

12. Settleable solids in sewage are measured using:

1. Conductivity meter

2. Imhoff cone

3. EDTA titration

4. Nephelometer

13 / 25

13. Nitrites are measured using colour development with:

1. KMnO₄

2. EDTA

3. Sulphanilic acid and naphthamine

4. Phenol-disulphonic acid

14 / 25

14. High pH in wastewater mainly causes:

1. Corrosion

2. Increased turbidity

3. Increased BOD

4. Scaling

15 / 25

15. Which statement is always true?

1. COD > BOD

2. COD = BOD

3. BOD > COD

4. COD < DO

16 / 25

16. Municipal sewage is considered highly polluting mainly because:

1. It contains pathogens and biodegradable organic matter

2. It contains toxic metals

3. It contains high TDS only

4. It is acidic in nature

17 / 25

17. High chloride concentration in sewage indicates:

1. Biological oxidation

2. Seawater intrusion

3. Domestic sewage

4. Fresh sewage

18 / 25

18. 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. C

3. A

4. B

19 / 25

19. 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°

20 / 25

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

1. B and C

2. A and B

3. A B and C

4. A and C

21 / 25

21. 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

22 / 25

22. Suspended solids are best defined as solids which:

1. Are retained by filtration

2. Pass through 1 µm filter

3. Are soluble in water

4. Settle only after coagulation

23 / 25

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

1. 8.5 – 10.5

2. 6.5 – 8.5

3. 5.5 – 9.5

4. 4.5 – 6.5

24 / 25

24. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. Fully treated sewage

3. Incomplete oxidation

4. No organic matter

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. Fresh sewage

2. Non-biodegradable

3. Fully treated

4. Highly biodegradable

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

1. Reduces hardness

2. Reduce Disinfectants efficiency

3. Increases alkalinity

4. Increases pH

2 / 25

2. Suspended solids are best defined as solids which:

1. Settle only after coagulation

2. Are retained by filtration

3. Are soluble in water

4. Pass through 1 µm filter

3 / 25

3. 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

4 / 25

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

1. A B and C

2. B and C

3. A only

4. B only

5 / 25

5. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Alkalinity

3. Total hardness

4. Lesser of total hardness and alkalinity

6 / 25

6. Settleable solids in sewage are measured using:

1. Imhoff cone

2. Conductivity meter

3. Nephelometer

4. EDTA titration

7 / 25

7. Nitrites are measured using colour development with:

1. EDTA

2. Sulphanilic acid and naphthamine

3. KMnO₄

4. Phenol-disulphonic acid

8 / 25

8. Presence of nitrites in sewage indicates:

1. Fully treated sewage

2. No organic matter

3. Fresh sewage

4. Incomplete oxidation

9 / 25

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

1. 0°

2. 90°

3. 180°

4. 45°

10 / 25

10. 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

11 / 25

11. High chloride concentration in sewage indicates:

1. Fresh sewage

2. Domestic sewage

3. Seawater intrusion

4. Biological oxidation

12 / 25

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

1. K₂Cr₂O₇

2. Chlorine

3. Ozone

4. KMnO₄

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. OH⁻ and half CO₃²⁻

2. Only bicarbonate

3. Only carbonate

4. Total alkalinity

14 / 25

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

1. BOD

2. Colour

3. Turbidity

4. Temperature

15 / 25

15. High pH in wastewater mainly causes:

1. Increased turbidity

2. Increased BOD

3. Scaling

4. Corrosion

16 / 25

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

1. Volatile solids

2. Settleable solids

3. Colloidal solids

4. Dissolved solids

17 / 25

17. 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. B

4. D

18 / 25

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

1. Turbidity rod

2. Jackson’s turbidimeter

3. Baylis turbidimeter

4. Nephelometer

19 / 25

19. 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. Partially biodegradable

4. Highly biodegradable

20 / 25

20. 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. Non-biodegradable

4. Fully treated

21 / 25

21. 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⁻

22 / 25

22. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. Imhoff cone

3. Turbidity

4. EDTA titration

23 / 25

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

1. 6.5 – 8.5

2. 8.5 – 10.5

3. 5.5 – 9.5

4. 4.5 – 6.5

24 / 25

24. Which statement is always true?

1. COD > BOD

2. COD = BOD

3. COD < DO

4. BOD > COD

25 / 25

25. Chlorides in wastewater are determined using:

1. EDTA titration

2. Conductivity method

3. Argentometric titration

4. Winkler method

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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