01 Hard water contains
a. Calcium Carbonate
B. Magnesium sulphate
C. Magnesium Carbonate
D. All the above.
Answer - D. All the above.
A. 5
B. 10
C. 20
D. 25
Answer - D. 25
03. The largest source of water for public water is : Ans: C
a. Lakes
B. Ponds
C. Streams
D. Rivers
Answer - C. Streams
04. On pH scale, maximum alkaline has the value of:
A. 5
B. 7
C.14
D. 21
Answer - C.14
05. Disinfection of drinking water is done to remove:
A. Turbidity
B. Odor
C. Color
D. Bacteria
Answer - D. Bacteria
A. Boiling
B. Adding lime
C. Adding alum
D. Filtration.
Answer - C. Adding alum
07. The pH value of neutral water is
a. 0
B. 5
C. 7
D. 14
Answer - C. 7
08. The hardness limit of potable water ranges between:
A. 50 to 75 ppm
B. 75 to 115 ppm
C. 115 to 150 ppm
D. 150 to 200 ppm
Answer - B. 75 to 115 ppm
09. The permissible nitrites in public water supplies should be
A. Nil
B. 0.5 ppm
C. 1 ppm
D. 1.5 ppm
Answer - A. Nil
10. Biological Oxygen Dem and (BOD) for safe drinking water must be
A. Nil
B. 5
C. 10
D. 15
Answer - A. Nil
11. The bacteria which can survive with or without free oxygen is known as:
A. Aerobic bacteria
B. Anaerobic bacteria
C. Facultative bacteria
D. Pathogenic bacteria
Answer - C. Facultative bacteria
12. For controlling algae, the most common Chemical used is
A. Copper Sulphate
B. Alum
C. Lime
D. Bleaching powder
Answer - C. Lime
13. The permissible pH value of drinking water should be between
B. 5.5 to 6.5
C. 6.5 to 8.5
D. 8.5 to 10.5
Answer - C. 6.5 to 8.5
14. Aeration is done to remove
A. Odor
B. Color.
C. Hardness
D. Turbidity.
Answer - B. Color.
15. A plain sedimentation tank can remove suspended impurities up to
A. 60%
B. 70%
C. 80%
D. 90%
Answer - B. 70%
16. Detention period for a plain sedimentation tank usually ranges from
A. 2 to 4 hrs.
B. 4 to 8 hrs
C. 8 to 12 hrs.
D. 12 to 14 hrs
Answer - B. 4 to 8 hrs
17. the most common coagulant is
A. Chlorine
B. Alum
C. Lime
D. Bleaching powder
Answer - B. Alum
18. To remove very fine suspended particles from water , the method adopted is
A. Screening
B. Sedimentation
C. Titration
D. Filtration
Answer - D. Filtration
19. The maximum permissible loss of head in rapid sand filter is
A. 1
B.2
C. 3
D. 4
Answer - C. 3
20. In rapid sand filter the air binding is caused due to
A. Negative pressure
B. Water Pressure
C. Vacuum Pressure
D. Atmospheric Pressure
Answer - A. Negative pressure
21. Rapid Gravity sand filter can remove bacteria upto
A. 50%
B. 60%
C. 70%
D. 80%
Answer - D. 80%
22. Rapid Gravity can remove turbidity upto
A. 15 gms /ltr.
B. 20 gms /ltr
C.30 gms/ltr
D.40 gms/ltr
Answer - D.40 gms/ltr
23. Disinfection of water is done by
A. Alum
B. potassium permanganate
C. Chlorine
D. Zinc oxide
Ans: C Chlorine
24. The Chlorine gas is converted to liquid when subjected to a pressure of
A.5kg/cm2
B.6 kg/cm2
C. 7 kg/cm2
D. 8 kg/cm2
Ans: C. 7 kg/cm2
25. Raw water when treated with only chlorine is known as
A.Plane chlorination
B.pre-chlorination
C.post- Chlorination
D.Super Chlorination
Answer - A.Plane chlorination
26. In plane chlorination the quantity of chlorine added is
A.0.25mg/lit
B.0.30 m/lit
C.0.45 m/lit
D. 0.50 m/lit
Answer - D. 0.50 m/lit
27. Hardness of water can be removed by boiling if it contains
A.Calcium bicarbonate
B.calcium sulphate
C.calcium Chloride
D.Calcium Fluoride
Answer - A.Calcium bicarbonate
28. One degree hardness means when water has a salt of amount
A.1.25 m/lit
B.12.25 m/lit
C.14.25 m/lit
D.16.25 m/lit
Answer - B.12.25 m/lit
29. The maximum permissible hardness for public consumption is
A. 95 m/lit
B. 105 m/lit
C. 115 m/lit
D. 125 m/lit
Answer - C. 115 m/lit
30. Permanent Hardness of water can be removed by
A.Coagulation process
B.chlorination Process
C.Filtration Process
D.Zeolite Process
Answer - C.Filtration Process
31. The quantity of fluoride permitted in drinking water is
A.1 m/lit
B.2 m/lit
C.3 m/lit
D.4 m/lit
Answer - A.1 m/lit
32. The liquid waste from kitchen and bathroom is called as
A.sewage
B.Sullage
C.storm Water
D. waste water.
Answer - B.Sullage
33. The gas which may cause explosion in sewers is
A.Carbondioxide
B.Methane
C.Carbon monoxide
D.hydrogen sulphide
Answer - B.Methane
34. In sludge digestion tank, the gas produced is
A.Oxygen
B.nitrogen
C.Carbondioxide
D.methane
Answer - C.Carbondioxide
35. The removal of oil and greaser from sewage is known as
A.Screening
B.Skimming
C.filtration
D. Sedimentation
Answer - B.Skimming
36. The water having pH-value 5,is known as
A.Alkaline
B.Acidic
C.neutral
D.all of the above
Answer - C.neutral
37. Recuperation test is carried out to determine
A. water table in well
B. Depth of water in Well
C. yield of well
D. none
Answer - C. yield of well
38. The presence of bi carbonates in water produce
A.Permanent hardness
B.temporary hardness
C.acidity
D.Alkalinity
Answer - B.temporary hardness
39. The presence of carbonates in water produce
A. Acidity
B. permanent Hardness
C. Alkanity
D. temporary hardness
Answer - B. permanent Hardness
40. Chlorination is done for the removal of
A. Bacteria
B. Hardness
C. turbidity
D Colour
Answer - A. Bacteria
41. Alum is a good
A.disinfectant
B.coagulant
C. Catalyst
D. Oxydant
Answer - B.coagulant
42. Pathogenic bacteria in water may cause
A. typhoid
B. cholera
C. dysentry
D.All the above
Answer - D.All the above
43. The sludge from septic tank should be removed after a max .period of
A.2yrs
B.3yrs
C.4yrs
D.5yrs
Answer - B.3yrs
44. The rate of accumulation of sludge per person per year is taken as
A.5ltrs
B.10ltrs
C.15ltrs
D.20ltrs
Answer - C.15ltrs
45. The average domestic consumption of water per capita per day is taken as
A.115ltrs
B.125ltrs
C.135ltrs
D.150ltrs
Answer - C.135ltrs
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