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. Volatile solids

2. Dissolved solids

3. Settleable solids

4. Colloidal solids

2 / 25

2. 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

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

1. Colour

2. Temperature

3. Turbidity

4. BOD

5 / 25

5. High chloride concentration in sewage indicates:

1. Seawater intrusion

2. Fresh sewage

3. Domestic sewage

4. Biological oxidation

6 / 25

6. Which statement is always true?

1. COD > BOD

2. BOD > COD

3. COD < DO

4. COD = BOD

7 / 25

7. Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as CaCO₃

3. mg/L as CO₃⁻

4. mg/L as HCO₃⁻

8 / 25

8. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. Turbidity

3. EDTA titration

4. Imhoff cone

9 / 25

9. 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. Total alkalinity

4. Only carbonate

10 / 25

10. 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

11 / 25

11. High pH in wastewater mainly causes:

1. Corrosion

2. Increased turbidity

3. Increased BOD

4. Scaling

12 / 25

12. Chlorides in wastewater are determined using:

1. Argentometric titration

2. Winkler method

3. Conductivity method

4. EDTA titration

13 / 25

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

1. A B and C

2. B and C

3. A and C

4. A and B

14 / 25

14. Suspended solids are best defined as solids which:

1. Settle only after coagulation

2. Pass through 1 µm filter

3. Are soluble in water

4. Are retained by filtration

15 / 25

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

1. Reduce Disinfectants efficiency

2. Increases alkalinity

3. Reduces hardness

4. Increases pH

16 / 25

16. Carbonate hardness of water is equal to:

1. Alkalinity

2. Lesser of total hardness and alkalinity

3. Non-carbonate hardness

4. Total hardness

17 / 25

17. 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

18 / 25

18. Municipal sewage is considered highly polluting mainly because:

1. It contains high TDS only

2. It contains pathogens and biodegradable organic matter

3. It is acidic in nature

4. It contains toxic metals

19 / 25

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

1. K₂Cr₂O₇

2. Chlorine

3. Ozone

4. KMnO₄

20 / 25

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

1. 5.5 – 9.5

2. 4.5 – 6.5

3. 8.5 – 10.5

4. 6.5 – 8.5

21 / 25

21. Nitrites are measured using colour development with:

1. EDTA

2. Phenol-disulphonic acid

3. Sulphanilic acid and naphthamine

4. KMnO₄

22 / 25

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

1. Turbidity rod

2. Nephelometer

3. Baylis turbidimeter

4. Jackson’s turbidimeter

23 / 25

23. Settleable solids in sewage are measured using:

1. Imhoff cone

2. Conductivity meter

3. Nephelometer

4. EDTA titration

24 / 25

24. 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

25 / 25

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

1. 45°

2. 180°

3. 0°

4. 90°

Your score is

The average score is 36%

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Quiz: Physical Chemical and Biological Characteristics of Water

25 Qs Time: 15 Minut

1 / 25

1. 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. Moderately biodegradable

3. Untreatable

4. Highly biodegradable

2 / 25

2. Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. KMnO₄

3. Phenol-disulphonic acid

4. EDTA

3 / 25

3. Chlorides in wastewater are determined using:

1. Conductivity method

2. Winkler method

3. EDTA titration

4. Argentometric titration

4 / 25

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

1. Increases alkalinity

2. Increases pH

3. Reduces hardness

4. Reduce Disinfectants efficiency

5 / 25

5. 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

6 / 25

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

1. Ozone

2. Chlorine

3. KMnO₄

4. K₂Cr₂O₇

7 / 25

7. Settleable solids in sewage are measured using:

1. Conductivity meter

2. Nephelometer

3. Imhoff cone

4. EDTA titration

8 / 25

8. 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

9 / 25

9. 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

10 / 25

10. 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°

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. Total alkalinity

2. Only carbonate

3. Only bicarbonate

4. OH⁻ and half CO₃²⁻

12 / 25

12. Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Alkalinity

3. Lesser of total hardness and alkalinity

4. Total hardness

13 / 25

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

1. 6.5 – 8.5

2. 4.5 – 6.5

3. 8.5 – 10.5

4. 5.5 – 9.5

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. 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

16 / 25

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

1. A only

2. B and C

3. A B and C

4. B only

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. B

2. D

3. A

4. C

18 / 25

18. Alkalinity of water is expressed in terms of:

1. mg/L as CO₃⁻

2. meq/L as OH⁻

3. mg/L as HCO₃⁻

4. mg/L as CaCO₃

19 / 25

19. Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. EDTA titration

3. Imhoff cone

4. Turbidity

20 / 25

20. Which statement is always true?

1. COD = BOD

2. COD < DO

3. BOD > COD

4. COD > BOD

21 / 25

21. Presence of nitrites in sewage indicates:

1. Fresh sewage

2. Incomplete oxidation

3. Fully treated sewage

4. No organic matter

22 / 25

22. High chloride concentration in sewage indicates:

1. Domestic sewage

2. Fresh sewage

3. Seawater intrusion

4. Biological oxidation

23 / 25

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

1. Nephelometer

2. Turbidity rod

3. Baylis turbidimeter

4. Jackson’s turbidimeter

24 / 25

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

1. BOD

2. Turbidity

3. Colour

4. Temperature

25 / 25

25. High pH in wastewater mainly causes:

1. Corrosion

2. Scaling

3. Increased BOD

4. Increased turbidity

Your score is

The average score is 36%

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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