Water Supply Engineering Objective Questions with Answers - Set 19 - ObjectiveBooks

# Practice Test: Question Set - 19

1. Cast iron pipes
(A) Are widely used in city water supplies
(B) Resist corrosion satisfactorily
(C) May last for 100 years
(D) All the above

2. B.O.D. of treated water should be
(A) 10 ppm
(B) 25 ppm
(C) 20 ppm
(D) Nil

3. The chloride content of treated water for public supplies should not exceed
(A) 100 ppm
(B) 150 ppm
(C) 200 ppm
(D) 250 ppm

4. Water is distributed to consumers by gravitational system, in (India)
(B) Mumbai
(C) Delhi
(D) Both (a) and (b)

5. The superimposed load transmitted to the pipe, is generally evaluated by Business formula
(A) pt = 3H3P/2Ï€Z
(B) pt = 3H3P/2Ï€Z5
(C) pt = 3H3P/2Ï€Z2
(D) pt = 3H3P2/2Ï€Z3

6. If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is
(A) n + y + r = 1
(B) n + y = r
(C) n + r = y
(D) y + r = n

7. Estimates of a water supply project depends upon the rate of water supply per capita consumption and probable population estimated at the end of the design period of
(A) 5 to 10 years
(B) 10 to 15 years
(C) 15 to 20 years
(D) 20 to 30 years

8. In distribution pipes, drain valves are provided at
(A) Lower point
(B) Higher point
(C) Junction points
(D) Anywhere

9. Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This entire process is generally known as
(A) Hydrological cycle
(B) Water cycle
(C) Evaporation and precipitation cycle
(D) All the above

10. Open channels supported over trestles, are generally known as
(A) Raised canals
(B) Aqueducts
(C) Siphons
(D) Flumes

11. Corrosion of a pipe
(A) Reduces its life span
(B) Reduces its carrying capacity
(D) All the above

12. The population of a city in 2000 is 50,000. The average per decade of the previous records of population is 5000 and average percentage per decade is 20%. The population of the city based on geometrical increase method, in the year 2020 will be
(A) 56,000
(B) 60,000
(C) 64,000
(D) 72,000

13. In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than
(A) 10
(B) 15
(C) 20
(D) 25

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

15. A well is considered to be good if it is sunk into
(A) Clay
(B) Sand
(C) Coarse gravel
(D) Silt

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