Objective Type Questions on Water Supply Engineering - Set 17 - ObjectiveBooks

Objective Type Questions on Water Supply Engineering - Set 17

Practice Test: Question Set - 17

1. De-chlorination is followed by
    (A) Post-chlorination
    (B) Pre-chlorination
    (C) Double-chlorination
    (D) Super-chlorination

2. The least thickness of class B cast iron (spun) pipe, is
    (A) 7.2 mm
    (B) 7.9 mm
    (C) 8.6 mm
    (D) 10 mm

3. Water having pH value as 6, is
    (A) Alkaline
    (B) Acidic
    (C) Neutral
    (D) None of these

4. Maximum permissible color for domestic water supplies, based on Cobalt scale, is
    (A) 5 P.P.M.
    (B) 10 P.P.M.
    (C) 15 P.P.M.
    (D) 20 P.P.M.

5. The main process to purify water by filtration, is
    (A) Mechanical straining
    (B) Flocculation and sedimentation
    (C) Biological metabolism
    (D) All the above

6. The approximate diameter of a water mains for supplying 7.2 mld with a velocity 1.2 m/sec, is
    (A) 24 cm
    (B) 26 cm
    (C) 28 cm
    (D) 30 cm

7. For least effect on the water table, the tube wells must be dug one in every
    (A) 0.5 sq km
    (B) 0.75 sq km
    (C) 1.0 sq km
    (D) 1.5 sq km

8. An area is declared drought affected if its mean rainfall is less than
    (A) 50 %
    (B) 60 %
    (C) 75 %
    (D) 85 %

9. A circular gravity aqueduct is not generally preferred to because of
    (A) Its maximum hydraulic mean depth
    (B) Maximum area per unit of wetted perimeter
    (C) Minimum cost of construction
    (D) Its proper support on the ground

10. Efficiency of removing bacterias from raw water by a slow sand filter, is
    (A) 80% to 81%
    (B) 85% to 86%
    (C) 90% to 97%
    (D) 98% to 99%

11. A high velocity of wash water is required for
    (A) Rapid gravity filter with strainers
    (B) Rapid gravity filter without strainers
    (C) Slow sand filter with strainers
    (D) Slow sand filter without strainers

12. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic meters and 36 million cubic meters respectively,
    (A) The reservoir will theoretically be silted in 240 years
    (B) The reservoir will start reducing after 60 years
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

13. 135 liters of water per person per day, is provided in
    (A) Nurses homes
    (B) Hostels
    (C) Residential schools
    (D) All the above

14. Pick up the correct statement from the following:
    (A) Excess quantities of iron and manganese in water, cause discoloration of clothes
    (B) Lead and barium salts have toxic effect
    (C) Higher copper content affects the lungs
    (D) All the above

15. Disinfection of drinking water is done to remove
    (A) Turbidity
    (B) Odour
    (C) Color
    (D) Bacterias

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