Practice Test: Question Set - 19
1. Pick up the correct statement from the following:
- (A) Turbidity
is more in strong sewage
- (B) The
black color indicates septic sewage
- (C) The sewage
omits offensive odors after four hours
- (D) All the
above
2. If the grit in grit chambers is 4.5 million liters per day, its cleaning is done
- (A) Manually
- (B) Mechanically
- (C) Hydraulically
- (D) Electrically
3. Which one of the following tests is used for testing sewer pipes?
- (A) Water test
- (B) Ball test
- (C) Mirror test
- (D) All of these
4. The ratio of depths at partial flow with central angle α and at full flow of a sewer, is
- (A) 1 - sin α/β
- (B) 1 - cos α/2
- (C) ½ (1 - cos
α/2)
- (D) ½ (1 - sin
α/2)
5. The non-clog pump which permits solid matter to pass out with the liquid sewage, is
- (A) Centrifugal
pump
- (B) Reciprocating
pump
- (C) Pneumatic
ejector
- (D) None of
these
6. With self cleansing velocity in sewers
- (A) Silting
occurs at bottom
- (B) Scouring
occurs at bottom
- (C) Both silting
and scouring occur at bottom
- (D) Neither
silting nor scouring occurs at bottom
7. When drainage to sewage ratio is 20, the peak dry weather flow is
- (A) 20%
of the design discharge
- (B) Slightly
less than 5% of the design discharge
- (C) Slightly
more than 5% of the design discharge
- (D) None of
these
8. As compared to fresh river water, sea water contains oxygen
- (A) 10% less
- (B) 20% less
- (C) 10% more
- (D) 20% more
9. Flocculated particles do not change their
- (A) Size
- (B) Shape
- (C) Weight
- (D) None of
these
10. Imhoff cone is used to determine
- (A) Settleable
solids
- (B) Suspended
solids
- (C) Dissolved
solids
- (D) None of
these
11. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
- (A) Should be
sunk by 20 cm
- (B) Should be
kept 20 cm above the adjacent portion
- (C) Should
be sunk by 50 cm
- (D) Need not be
sunk
12. Discrete or granular particles change their
- (A) Size
- (B) Shape
- (C) Weight
- (D) None of
these
13. The sewer pipe which carries sewage from a building for immediate disposal is
- (A) House sewer
- (B) Lateral
sewer
- (C) Intercepting
sewer
- (D) Main
sewer
14. The ratio of design discharge to the surface area of a sedimentation tank is called
- (A) Surface
loading
- (B) Overflow
rate
- (C) Overflow
velocity
- (D) All of these
15. In SI units the power of sound is represented in
- (A) Kgs
- (B) Joules
- (C) Newtons
- (D) Watts
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