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

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°

2 / 25

Suspended solids are best defined as solids which:

1. Pass through 1 µm filter

2. Are soluble in water

3. Are retained by filtration

4. Settle only after coagulation

3 / 25

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

1. Temperature

2. BOD

3. Colour

4. Turbidity

4 / 25

High pH in wastewater mainly causes:

1. Corrosion

2. Increased BOD

3. Increased turbidity

4. Scaling

5 / 25

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

1. Volatile solids

2. Settleable solids

3. Dissolved solids

4. Colloidal solids

6 / 25

Municipal sewage is considered highly polluting mainly because:

1. It contains toxic metals

2. It contains high TDS only

3. It is acidic in nature

4. It contains pathogens and biodegradable organic matter

7 / 25

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

1. A and B

2. A and C

3. A B and C

4. B and C

8 / 25

Approximate estimation of TDS is commonly done using:

1. EDTA titration

2. Turbidity

3. Electrical conductivity

4. Imhoff cone

9 / 25

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

10 / 25

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 bicarbonate

3. OH⁻ and half CO₃²⁻

4. Only carbonate

11 / 25

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

1. Ozone

2. Chlorine

3. KMnO₄

4. K₂Cr₂O₇

12 / 25

Carbonate hardness of water is equal to:

1. Non-carbonate hardness

2. Lesser of total hardness and alkalinity

3. Total hardness

4. Alkalinity

13 / 25

Chlorides in wastewater are determined using:

1. Conductivity method

2. EDTA titration

3. Winkler method

4. Argentometric titration

14 / 25

Presence of nitrites in sewage indicates:

1. Incomplete oxidation

2. Fully treated sewage

3. Fresh sewage

4. No organic matter

15 / 25

Alkalinity of water is expressed in terms of:

1. mg/L as CaCO₃

2. mg/L as HCO₃⁻

3. meq/L as OH⁻

4. mg/L as CO₃⁻

16 / 25

High chloride concentration in sewage indicates:

1. Domestic sewage

2. Seawater intrusion

3. Fresh sewage

4. Biological oxidation

17 / 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. Non-biodegradable

2. Highly biodegradable

3. Fresh sewage

4. Fully treated

18 / 25

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

1. Increases alkalinity

2. Reduces hardness

3. Reduce Disinfectants efficiency

4. Increases pH

19 / 25

Settleable solids in sewage are measured using:

1. EDTA titration

2. Imhoff cone

3. Conductivity meter

4. Nephelometer

20 / 25

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

1. Baylis turbidimeter

2. Turbidity rod

3. Nephelometer

4. Jackson’s turbidimeter

21 / 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. Untreatable

3. Moderately biodegradable

4. Highly biodegradable

22 / 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

23 / 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. A

2. B

3. C

4. D

24 / 25

Nitrites are measured using colour development with:

1. EDTA

2. Phenol-disulphonic acid

3. Sulphanilic acid and naphthamine

4. KMnO₄

25 / 25

Which statement is always true?

1. COD = BOD

2. COD > BOD

3. COD < DO

4. BOD > COD

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

Nitrites are measured using colour development with:

1. Sulphanilic acid and naphthamine

2. Phenol-disulphonic acid

3. KMnO₄

4. EDTA

2 / 25

Chlorides in wastewater are determined using:

1. Argentometric titration

2. Conductivity method

3. Winkler method

4. EDTA titration

3 / 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

4 / 25

High chloride concentration in sewage indicates:

1. Domestic sewage

2. Fresh sewage

3. Biological oxidation

4. Seawater intrusion

5 / 25

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. Highly biodegradable

3. Untreatable

4. Partially biodegradable

6 / 25

The optimum pH range for biological wastewater treatment is:

1. 6.5 – 8.5

2. 4.5 – 6.5

3. 5.5 – 9.5

4. 8.5 – 10.5

7 / 25

Alkalinity of water is expressed in terms of:

1. meq/L as OH⁻

2. mg/L as CO₃⁻

3. mg/L as HCO₃⁻

4. mg/L as CaCO₃

8 / 25

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°

9 / 25

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

1. Increases pH

2. Reduce Disinfectants efficiency

3. Reduces hardness

4. Increases alkalinity

10 / 25

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

1. Colour

2. BOD

3. Turbidity

4. Temperature

11 / 25

Approximate estimation of TDS is commonly done using:

1. Electrical conductivity

2. Turbidity

3. Imhoff cone

4. EDTA titration

12 / 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. Fully treated

2. Non-biodegradable

3. Highly biodegradable

4. Fresh sewage

13 / 25

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

1. A B and C

2. A and B

3. A and C

4. B and C

14 / 25

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

1. Chlorine

2. K₂Cr₂O₇

3. KMnO₄

4. Ozone

15 / 25

Settleable solids in sewage are measured using:

1. Imhoff cone

2. Nephelometer

3. Conductivity meter

4. EDTA titration

16 / 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. B

3. C

4. A

17 / 25

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

1. Baylis turbidimeter

2. Nephelometer

3. Turbidity rod

4. Jackson’s turbidimeter

18 / 25

Which statement is always true?

1. COD > BOD

2. COD = BOD

3. BOD > COD

4. COD < DO

19 / 25

Suspended solids are best defined as solids which:

1. Pass through 1 µm filter

2. Are soluble in water

3. Are retained by filtration

4. Settle only after coagulation

20 / 25

1. Only carbonate

2. OH⁻ and half CO₃²⁻

3. Total alkalinity

4. Only bicarbonate

21 / 25

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

22 / 25

Municipal sewage is considered highly polluting mainly because:

1. It contains toxic metals

2. It contains pathogens and biodegradable organic matter

3. It is acidic in nature

4. It contains high TDS only

23 / 25

Carbonate hardness of water is equal to:

1. Total hardness

2. Alkalinity

3. Non-carbonate hardness

4. Lesser of total hardness and alkalinity

24 / 25

Presence of nitrites in sewage indicates:

1. No organic matter

2. Fully treated sewage

3. Incomplete oxidation

4. Fresh sewage

25 / 25

High pH in wastewater mainly causes:

1. Corrosion

2. Increased BOD

3. Scaling

4. Increased turbidity

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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