Water Supply Engineering Objective Questions Answers - Set 15 - ObjectiveBooks

# Practice Test: Question Set - 15

1. The maximum permissible color for domestic supplies based on cobalt scale, is
(A) 5 ppm
(B) 10 ppm
(C) 15 ppm
(D) 20 ppm

2. Increase in population of a rapidly growing city, may be estimated by
(A) Arithmetical mean method
(B) Geometrical method
(C) Incremental increase method
(D) Graphical comparison method

3. Pick up the correct statement from the following:
(A) Air lift pumps are generally used for pumping water from deep wells
(B) Jet pumps are generally used for pumping water from small wells
(C) The hydraulic ram works on the principle of water hammer
(D) All the above

4. Per capita demand of water is calculated in liters
(A) Per person per day
(B) Per person per month
(C) Per person per year
(D) None of these

5. Hard water for public water supply is discarded because
(A) It consumes more soap
(B) It contains lot of turbidity
(C) It contains pathogenic bacterias
(D) It possesses bad taste and odour

6. If the specific capacity of a well is 0.3183 × 10-3 per sec, the discharge from a well of 4 m diameter under a depression head of 4 m, is
(A) 8 liters/sec
(B) 10 liters/sec
(C) 12 liters/sec
(D) 16 liters/sec

7. Pick up the incorrect statement from the following:
(A) Iron salts produce heavy flocks and hence remove more suspended matter
(B) Iron salts remove hydrogen sulphides
(C) Iron salts can be used over a limited range of pH values
(D) Iron salts impart corrosiveness to water

8. Asbestos pipes are
(A) Light in weight and easy to transport
(B) Highly resistant to corrosion
(C) High flexible to accommodate deflection up to 12°
(D) All the above

9. A strainer type well sunk through three previous layers intervened by three impervious aquicludes, draws water from
(A) Top most pervious layer
(B) Central pervious layer
(C) Lowest pervious layer
(D) All the pervious layers

10. Runoff is the quantity of water which flows
(A) In sewer pipes
(B) Due to leakage in pipes
(C) In rivers
(D) None of these

11. The yield of a rapid gravity filter as compared to that of slow sand filter, is
(A) 10 times
(B) 15 times
(C) 20 times
(D) 30 times

12. The most ideal disinfectant used for drinking water throughout the world, is
(A) Alum
(B) Lime
(C) Chlorine
(D) Nitrogen

13. Perched aquifers generally occur
(A) Below water table
(B) Above water table
(C) In aquicludes
(D) In artesian aquifers

14. Check valves are installed
(A) On the delivery side of the pumping set
(B) At the interconnections between polluted water system and a potable water system
(C) Both (a) and (b)
(D) Neither (a) nor (b)

15. If average volume of sediment deposits is one-tenth million cubic meters per year in a reservoir of total capacity 10 million cubic meters, the dead storage will be filled up, in
(A) 10 years
(B) 15 years
(C) 20 years
(D) 25 years

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