Practice Test: Question Set - 14
1. Bacterias which can survive with or without free oxygen, are known
- (A) Aerobic
bacterias
- (B) Anaerobic
bacterias
- (C) Facultative
bacterias
- (D) None of
these
2. The standard B.O.D. at 20°C, is taken for the consumption in
- (A) 2 days
- (B) 3 days
- (C) 4 days
- (D) 5 days
3. Distribution of wash water is provided in
- (A) Sedimentation
tank
- (B) Slow
sand filter
- (C) Rapid
gravity filter
- (D) All
the above
4. If P is population of a city in thousands and Q is fire demand in liters per minute, for proper estimate of water, the Empirical formula Q = 1135 [(P/5) + 10] is suggested by
- (A) National
Board of fire under-writers
- (B) Freeman
- (C) Kuichling
- (D) None
of these
5. During treatment of water, sedimentation is done
- (A) Before
filtration
- (B) After
filtration
- (C) Simultaneously
with filtration
- (D) Along
with chlorination
6. The ratio of the maximum daily consumption to the average daily demand, is
- (A) 1.0
- (B) 1.2
- (C) 1.4
- (D) 1.8
7. Alkalinity in water may be caused due to
- (A) Calcium
and magnesium bicarbonates
- (B) Sodium
carbonate
- (C) Potassium
carbonate
- (D) All
the above
8. The main draw-back of centrifugal pump, is
- (A) Necessity
of priming
- (B) Discharge
from pump varies with the load of water
- (C) For
high heads, efficiency is low up to 50%
- (D) All
the above
9. The factor to be considered for the source of city water supply, is
- (A) Quantity
and quality of the available water
- (B) Elevation
of the source of water
- (C) General
terrain intervening the area
- (D) All
the above
10. From the surface of reservoir, evaporation may be minimized by sprinkling
- (A) Spirit
- (B) Hydrochloric
acid
- (C) Acetyl
alcohol
- (D) Methane
11. The transitional middle portion of a logistic curve follows
- (A) A
geometric growth
- (B) A
logarithmic growth
- (C) A
first over curve
- (D) A
constant rate
12. For plain chlorination of water, the quantity of chlorine used, is
- (A) 0.1 mg/liter
- (B) 0.2 mg/liter
- (C) 0.3 mg/liter
- (D) 0.5 mg/liter
13. In distribution pipes, air valves are provided at
- (A) Lower
points
- (B) Junction
points
- (C) Higher
points
- (D) Anywhere
14. Manholes along the mains from the source to a city are provided at 500 m intervals in
- (A) Steel
pipes
- (B) R.C.C.
pipes
- (C) Hume
steel pipes
- (D) All
the above
15. The valves provided at low points of pipes to drain off water quickly under gravity, are called
- (A) Blow
off valves
- (B) Drain
valves
- (C) Sewer
valves
- (D) All
the above
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