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

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

Approximate estimation of TDS is commonly done using:

1. EDTA titration

2. Imhoff cone

3. Electrical conductivity

4. Turbidity

3 / 25

Suspended solids are best defined as solids which:

1. Are soluble in water

2. Are retained by filtration

3. Settle only after coagulation

4. Pass through 1 µm filter

4 / 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. Highly biodegradable

4. Fully treated

5 / 25

Chlorides in wastewater are determined using:

1. Conductivity method

2. EDTA titration

3. Argentometric titration

4. Winkler method

6 / 25

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

1. Colloidal solids

2. Dissolved solids

3. Settleable solids

4. Volatile solids

7 / 25

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

1. Jackson’s turbidimeter

2. Baylis turbidimeter

3. Nephelometer

4. Turbidity rod

8 / 25

Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as CaCO₃

3. mg/L as HCO₃⁻

4. mg/L as CO₃⁻

9 / 25

High chloride concentration in sewage indicates:

1. Seawater intrusion

2. Fresh sewage

3. Domestic sewage

4. Biological oxidation

10 / 25

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

11 / 25

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

1. KMnO₄

2. K₂Cr₂O₇

3. Ozone

4. Chlorine

12 / 25

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

1. Colour

2. Turbidity

3. BOD

4. Temperature

13 / 25

Settleable solids in sewage are measured using:

1. Nephelometer

2. EDTA titration

3. Imhoff cone

4. Conductivity meter

14 / 25

Presence of nitrites in sewage indicates:

1. Incomplete oxidation

2. No organic matter

3. Fully treated sewage

4. Fresh sewage

15 / 25

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

1. Increases pH

2. Increases alkalinity

3. Reduces hardness

4. Reduce Disinfectants efficiency

16 / 25

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. OH⁻ and half CO₃²⁻

3. Total alkalinity

4. Only bicarbonate

17 / 25

Municipal sewage is considered highly polluting mainly because:

1. It contains high TDS only

2. It is acidic in nature

3. It contains pathogens and biodegradable organic matter

4. It contains toxic metals

18 / 25

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

1. 90°

2. 0°

3. 45°

4. 180°

19 / 25

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

20 / 25

Which statement is always true?

1. COD = BOD

2. BOD > COD

3. COD < DO

4. COD > BOD

21 / 25

Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. Phenol-disulphonic acid

3. KMnO₄

4. EDTA

22 / 25

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

23 / 25

High pH in wastewater mainly causes:

1. Increased turbidity

2. Corrosion

3. Scaling

4. Increased BOD

24 / 25

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

25 / 25

Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Alkalinity

3. Lesser of total hardness and alkalinity

4. Total hardness

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

Presence of nitrites in sewage indicates:

1. Fresh sewage

2. Fully treated sewage

3. Incomplete oxidation

4. No organic matter

2 / 25

Carbonate hardness of water is equal to:

1. Alkalinity

2. Non-carbonate hardness

3. Total hardness

4. Lesser of total hardness and alkalinity

3 / 25

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

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

1. Temperature

2. BOD

3. Colour

4. Turbidity

5 / 25

Suspended solids are best defined as solids which:

1. Are retained by filtration

2. Pass through 1 µm filter

3. Settle only after coagulation

4. Are soluble in water

6 / 25

Chlorides in wastewater are determined using:

1. Winkler method

2. Argentometric titration

3. EDTA titration

4. Conductivity method

7 / 25

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

1. B only

2. A B and C

3. A only

4. B and C

8 / 25

Approximate estimation of TDS is commonly done using:

1. Turbidity

2. Imhoff cone

3. Electrical conductivity

4. EDTA titration

9 / 25

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

1. 90°

2. 45°

3. 180°

4. 0°

10 / 25

Municipal sewage is considered highly polluting mainly because:

1. It contains pathogens and biodegradable organic matter

2. It contains high TDS only

3. It is acidic in nature

4. It contains toxic metals

11 / 25

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

12 / 25

The optimum pH range for biological wastewater treatment is:

1. 8.5 – 10.5

2. 5.5 – 9.5

3. 6.5 – 8.5

4. 4.5 – 6.5

13 / 25

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

14 / 25

Which statement is always true?

1. COD < DO

2. COD > BOD

3. BOD > COD

4. COD = BOD

15 / 25

Settleable solids in sewage are measured using:

1. Imhoff cone

2. Nephelometer

3. EDTA titration

4. Conductivity meter

16 / 25

Nitrites are measured using colour development with:

1. Phenol-disulphonic acid

2. EDTA

3. Sulphanilic acid and naphthamine

4. KMnO₄

17 / 25

1. Only carbonate

2. Only bicarbonate

3. OH⁻ and half CO₃²⁻

4. Total alkalinity

18 / 25

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

19 / 25

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. A

4. D

20 / 25

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

1. Ozone

2. K₂Cr₂O₇

3. KMnO₄

4. Chlorine

21 / 25

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

1. Increases alkalinity

2. Reduce Disinfectants efficiency

3. Reduces hardness

4. Increases pH

22 / 25

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

1. Jackson’s turbidimeter

2. Turbidity rod

3. Baylis turbidimeter

4. Nephelometer

23 / 25

High pH in wastewater mainly causes:

1. Increased BOD

2. Increased turbidity

3. Corrosion

4. Scaling

24 / 25

High chloride concentration in sewage indicates:

1. Biological oxidation

2. Fresh sewage

3. Seawater intrusion

4. Domestic sewage

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. Fully treated

3. Non-biodegradable

4. Highly biodegradable

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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