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)
- (A) Dehradun
- (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/2πZ
- (B) pt = 3H3P/2πZ5
- (C) pt = 3H3P/2πZ2
- (D) pt = 3H3P2/2πZ3
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
- (C) Adds color
to water
- (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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