1. In which method, percentage increase is assumed to be constant decade to decade?

[A] Arithmetic Progress method
[B] Incremental Increase Method
[C] Geometric Progression Method
[D] None

Answer: Option C

2. Which instrument is used to measure color in water?

[A] Tintometer
[B] Nephelometer
[C] Jackson meter
[D] Bayli’s meter

Answer: Option A


3. Which of the following is correct method of water treatment?

[A] Screening – Aeration – Sedimentation – Coagulation
[B] Coagulation – Sedimentation – Aeration – Screening
[C] Screening – Sedimentation – Aeration – Coagulation
[D] Sedimentation – Coagulation – Aeration – Screening

Answer: Option A

Explanation: The correct sequence is:

  1. Screening
  2. Aeration
  3. Sedimentation
  4. Coagulation
  5. Flocculation
  6. Filtration
  7. Disinfection

4. What is maximum permissible limit of fluoride in water?

[A] 1 mg/l
[B] 2.5 mg/l
[C] 3 mg/l
[D] 1.5 mg/l

Answer: Option D


5. What is the acceptable limit of hardness?

[A] 1000 mg/L
[B] 500 mg/L
[C] 300 mg/L
[D] 200 mg/L

Answer: Option D



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