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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