Wastewater Treatment and Recycling Nptel Week 3 Answers
Are you looking for Wastewater Treatment and Recycling Nptel Week 3 Answers ? All weeks solutions of this Swayam course are available here.
Table of Contents
Wastewater Treatment and Recycling Nptel Week 3 Answers (July-Dec 2025)
Course link: Click here to visit course on Nptel Website
Question 1. The unit for Turbidity measured by quantifying the relative intensity of light scattered at 90° is:
a) mg/L
b) PCU
c) µS/L
d) NTU
Question 2. A solution of 1 mg/L platinum and 0.5 mg/L cobalt is used as a standard unit for:
a) Turbidity
b) Colour
c) Total Suspended Solids
d) Conductivity
Question 3. Match the following measurement methods with their respective water quality parameters:
Measurement methods
Spectrophotometric method (i)
(ii) Titration method
(iii) Gravimetric method
Water Quality Parameter
A. Solids
B. Alkalinity
C. Colour
a) (i)-B, (ii)-A, (iii)-C
b) (i)-C, (ii)-A, (iii)-B
c) (i)-C, (ii)-B, (iii)-A
d) (i)-A, (ii)-C, (iii)-B
These are Wastewater Treatment and Recycling Nptel Week 3 Answers
Question 4. Which of the following statements is correct about the conductivity of the two samples?
a) Conductivity of both the samples would be zero
b) S1 will have lesser conductivity than S2
c) S1 will have higher conductivity than S2
d) Conductivity of both the samples will be same, but not zero.
Question 5. Which of the following statements is correct about the turbidity of the two samples?
a) Turbidity of both the samples would be zero
b) S1 will have lesser turbidity than S2
c) S1 will have higher turbidity than S2
d) Turbidity of both the samples will be same, but not zero.
Question 6. Which of the following statements is correct about the solids in the two samples?
a) TSS as well as TDS of both the samples would be same.
b) S1 will have higher TSS but lesser TDS than S2
c) S1 will have lesser TSS but higher TDS than S2
d) Both samples have same TDS, and zero TSS.
Question 7. MPN test typically measures:
a) Fecal or total coliforms in water
b) Priority metals in water
c) Nutrients in water
d) Emerging pollutants in water
Question 8. Excess of nitrogen and phosphorus in wastewaters is usually referred as:
a) Nutrient pollution
b) Organic pollution
c) Solids pollution
d) Emerging contaminants pollution
Question 9. A wastewater sample has 70% of total organics as biodegradable. The ultimate BOD of the sample was estimated as 280 mg/L. The expected COD of the sample would be around:
a) 930 mg/L
b) 400 mg/L
c) 364 mg/L
d) 196 mg/L
These are Wastewater Treatment and Recycling Nptel Week 3 Answers
Question 10. Identify the correct statements regarding dissolved oxygen in water:
Statement I: Cold water holds lesser oxygen than warm water.
Statement II: Higher altitude waters hold more oxygen than that at lower altitudes.
a) Statement I is correct, while statement II is incorrect
b) Statement II is correct, while statement I is incorrect
c) Both, statements I and II are correct
d) Both, statements I and II are incorrect
Question 11. Benzoic acid could be oxidized as per the reaction:
2C6H5COOH + 15O2 → 14CO2 + 6H2O.
A wastewater sample containing 182 mg/L of Benzoic acid will have theoretical COD as:
a) 264 mg/L
b) 358 mg/L
c) 520 mg/L
d) 704 mg/L
Question 12. The Total Suspended Solids (TSS) concentration in the wastewater is (in mg/L):
Question 13. The Total Dissolved Solids (TDS) concentration in the wastewater is (in mg/L):
Question 14. The Volatile Suspended Solids (VSS) concentration in the wastewater is (in mg/L):
Question 15. The Total Solids (TS) concentration in the wastewater is (in mg/L):
These are Wastewater Treatment and Recycling Nptel Week 3 Answers