NPTEL Water and waste water treatment Week 1 Assignment Answers 2025

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NPTEL Water and waste water treatment Week 1 Assignment Answers 2025

1. Which of the following filtration technologies can remove viruses effectively from water

  • Ultra filtration
  • Conventional filtration
  • Micro filtration
  • Reverse osmosis

Answer :- For Answer Click Here

2. Select the correct option for the statement given below
“Germ theory states that certain diseases caused by the invasion of the body by microorganisms, which are too small to be seen except through a microscope”

  • True
  • False

Answer :-

3. Considerable fractions of bacteria and algae can be removed by sand filtration

  • True
  • False

Answer :-

4. Select the correct statements regarding the acceptable limits for drinking water as per Indian standards

  • Total coliform (MPN/100mL) < 10
  • Total alkalinity ≤ 250 ppm
  • Total coliform (MPN/100mL) = Nil
  • Total alkalinity < 200 ppm

Answer :-

5. Match the type of treatment with their primary function

Type of treatmentFunction
1. Preliminary treatmentA. Pathogens removal
2. Disinfection treatmentB. Suspended Solids removal
3. Primary treatmentC. Removal of bigger sized particles
4. Secondary treatmentD. BOD/Organics removal

  • 1-A, 2-C, 3-D, 4-B
  • 1-B, 2-A, 3-C, 4-D
  • 1-C, 2-A, 3-B, 4-D
  • 1-A, 2-B, 3-C, 4-D

Answer :-

6. Choose the right option regarding unit conversions

  • 100 mg/L = 100 ppb
  • Mg2+ molecular weight is 24 g/mole = 24 g/equivalent
  • 100 mg/L = 100 ppm
  • NaCl- molecular weight is 58.5 g/mole= 58.5 g/equivalent

Answer :- For Answer Click Here

7. Choose the correct statements regarding suspended particles in water treatment plant

  • Can be removed by gravity, but takes long time
  • Suspended particles have positive charge on its surface
  • Removed by adding negatively charged chemicals
  • Can be removed by sand filtration

Answer :-

8. 80 mg/L Mg2+ is present in water sample. The concentration of Mg2+ in terms of mg/L as CaCO3 is __________ (Molecular weight of Mg2+ and CaCO3 is 24 and 100 g/mole respectively)

Answer :-

9. Choose the correct option for the missing treatment units shown in the typical water treatment plant flow chart below

  • A–> Flocculation, B–> Rapid mix, C–> Disinfection, D–> Filtration
  • A–>Rapid mix, B–>Flocculation, C–>Filtration, D–>Disinfection
  • A–>Rapid mix, B–> Filtration, C–> Flocculation, D–>Disinfection
  • A–> Disinfection, B–>Flocculation, C–> Rapid mix, D–> Filtration

Answer :-

10. The transport due to diffusion is not considered along the flow direction in the diffusion system

  • True
  • False

Answer :- For Answer Click Here

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