Water Supply Engineering problems
- 1. Alkalinity in water may be caused due to
Options- A. calcium and magnesium bicarbonates
- B. sodium carbonate
- C. potassium carbonate
- D. calcium hydroxide
- E. all the above. Discuss
Correct Answer: all the above.
- 2. For least effect on the water table, the tube wells must be dug one in every
Options- A. 0.5 sq km
- B. 0.75 sq km
- C. 1.0 sq km
- D. 1.25 sq km
- E. 1.5 sq km. Discuss
Correct Answer: 1.5 sq km.
- 3. Pick up the correct statement from the following :
Options- A. Due to boiling, the bacterias present in water can be destroyed
- B. Lime may be used for softening hard water
- C. Excess lime when added to water, raises the pH value of water
- D. the bacterias do not survive in water having pH value exceeding 9.5
- E. All the above. Discuss
Correct Answer: All the above.
- 4. In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than
Options- A. 10
- B. 15
- C. 20
- D. 25 Discuss
Correct Answer: 20
- 5. Per capita demand of water is calculated in litres
Options- A. per person per day
- B. per person per month
- C. per person per year
- D. none of these. Discuss
Correct Answer: per person per day
- 6. The maximum permissible hardness for public supplies is
Options- A. 95 mg/litre
- B. 105 mg/litre
- C. 115 mg/litre
- D. 125 mg/litre
- E. 150 mg/litre. Discuss
Correct Answer: 115 mg/litre
- 7. Rapid sand filter
Options- A. should be preceeded by coagulation and sedimentation
- B. uses rapid sand as filter media
- C. is used after slow sand filtering has been done
- D. can combine disinfection also. Discuss
Correct Answer: should be preceeded by coagulation and sedimentation
- 8. Pick up the correct statement from the following :
Options- A. Copper pipes are highly resistant to acidic and alkaline water
- B. Wrought iron pipes are lighter than cast iron pipes
- C. Wrought iron pipes corrode quickly and are less durable
- D. Wrought iron pipes coated with zinc, are called galvanised iron pipes
- E. All the above. Discuss
Correct Answer: All the above.
- 9. At break point of chlorination,
Options- A. chlorine is used to oxidise
- B. residual chloride is zero
- C. residual chloride is maximum
- D. residual chlorine reappears. Discuss
Correct Answer: residual chlorine reappears.
- 10. Low turbidity of water is detected by
Options- A. Turbidity tube
- B. Jackson turbidity meter
- C. Baylis turbidimeter
- D. Hellipe turbidimeter
- E. None of these. Discuss
Correct Answer: Baylis turbidimeter
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