1. ___________ poisoning water in Japan is from fishes.
Correct : B. Arsenic
2. Fishes can store more quantity of ___________ in their bodies.
Correct : A. Mercury
3. Waste water released from _________ are not the sources of bacteria.
Correct : D. Industries
4. Bacteria and micro organisms present in the water will cause _________ in human and animals.
Correct : B. Intestinal tract
5. Infectious hepatitis is caused by ___________
Correct : B. Viruses
6. Amoebic dysentery is caused by ___________
Correct : D. Protozoa
7. Bacteria in water causes ________
Correct : B. Typhoid
8. Helminth in the water causes __________
Correct : A. Hook worm
9. The ____________ is an important requirement of the aquatic life.
Correct : C. Dissolved oxygen
10. The optimum value in natural water is ________
Correct : C. 4-6ppm
11. What is the full form of BOD?
Correct : A. Biochemical oxygen demand
12. The disappearance of the plants and animals is due to the _________ in water.
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Correct : C. Oxygen depletion
13. The decomposition of the matter produces into ___________ and in presence of ____________
Correct : A. Carbondioxide and oxygen
14. The organic matter present in the water is of __________ types.
Correct : A. Two
15. The temperature of sewage increases. What will be the effect on the dissolved oxygen in sewage?
Correct : C. Decrease
16. What is the minimum quantity of dissolved oxygen that should be present in the treated sewage?
Correct : B. 4ppm
17. The presence of which of the following in sewage indicates nitrogen content before decomposition of
sewage?
Correct : D. Albuminoid nitrogen
18. The presence of free ammonia in sewage represents ____________
Correct : C. Recent pollution
19. Which chemical is used for the titration of waste water for finding its chloride content?
Correct : C. Potassium chromate
20. The type of solids which floats in sewage is __________
Correct : A. Suspended solids
21. The presence of which of the following indicates old pollution?
Correct : D. Sulfates
22. ________ is used to find the D.O content of sewage.
Correct : B. Chromatography
23. The permissible dose of chloride in domestic sewage is __________
Correct : A. 120ppm
24. Imhoff cone is used to measure the _______
Correct : B. Settleable solids
25. The decomposition of sewage takes place, causing a pungent smell. Which of the following causes the
pungent smell?
Correct : D. H2S
26. Which of the following disease is caused due to lack of nitrates?
Correct : B. Methemoglobinemia
27. The maximum quantity of dissolved oxygen present in wastewater is called __________
Correct : A. Saturated dissolved oxygen
28. Identify the odd one of the following.
Correct : B. Chlorides
29. The Clean Water Act (CWA) regulates __________
Correct : A. Discharge of pollutants into the waters of the United States
30. Section __________ of CWA regulates discharges of hazardous substances.
Correct : B. 311(b)(2)(A)
31. The Federal Water Pollution Control Act of 1948 was the first major U.S. law to address water
pollution.
Correct : D. 1948
32. The CWA reduced the amount of pollution from _________
Correct : A. Point sources
33. The discharge of regulated chemicals into surface waters is controlled by __________
Correct : C. NPDES
34. The maximum amount of pollution that each waterway could absorb is known as _________
Correct : A. TMDL
35. __________ requires EPA to establish regulations to protect human health from contaminants present
in drinking water.
Correct : B. SDWA
36. Who is responsible for the clean-up of oil spill?
Correct : C. Oil Pollution Act
37. Which section of CWA regulates land disposal of sludge?
Correct : D. Section 405
38. Which CWA program controls water pollution by regulating point sources?
Correct : C. NPDES
39. Which section of CWA is responsible for monitoring of wetlands?
Correct : C. Section 404
40. Which CWA program manages non-point source pollution?
Correct : A. NPSMP
41. When did CWA come into existence?
Correct : C. 1972
42. Which of the following is the physical monitoring of the lake?
Correct : D. Turbidity
43. Conductivity comes under the ___________ monitoring of the lake.
Correct : A. Physical
44. ____________ comes under the chemical monitoring of the lake.
Correct : A. Detergents
45. Pollution enters into the water system in ___________ ways.
Correct : D. 4
46. A large amount of soil can move with the run off called ___________
Correct : A. Soil erosion
47. What is the full form of GAP?
Correct : B. Ganga action plan
48. The central pollution control board and the department of ocean and environment has established
__________ stations over the entire coastal line of the country.
Correct : D. 174
49. Coastal water shows major differences in ___________
Correct : C. Salinity
50. Monitoring systems can be carried out by using __________
Correct : B. Automatic sensors
51. Control of river pollution can be done by providing the extra ___________ during dry season.
Correct : D. Oxygen
52. Determination of flow increase is used for the monitoring of ___________
Correct : B. River pollution
53. which of the following does not include in the monitoring of river pollution?
Correct : D. Colour of the water
54. Which one of the following is the basic indicator of river health?
Correct : C. DO
55. What is the minimum amount of DO required for the life survival of aquatic animals?
Correct : C. 2 mg/l
56. In the concept of self purification of natural streams, complete the following phrase. Solution to
pollution is _________
Correct : B. Dilution
57. _________ is accomplished by the replenishment of oxygen lost to bacterial degradation of organic
waste.
Correct : A. Gas transfer
58. On which of the following does the self purification process does not depend?
Correct : D. Aquatic species
59. In a flowing stream, the breakdown of degradable wastes by bacteria ________ dissolved oxygen.
Correct : B. Depletes
60. What is the objective of water quality management?
Correct : A. Control the discharge of pollutants
61. The impact of pollution depends upon nature of the pollutants and the ___________
Correct : D. Characteristics of river
62. Which of the following sewerage systems carry domestic and industrial wastewater?
Correct : A. sanitary sewers
63. Which of the following is a strict anaerobe?
Correct : D. Methanosarcina
64. In which of the following treatment involve oxidation of organic constituents of the wastewater?
Correct : B. Secondary treatment
65. The upper region of the trickling filter is favorable for the growth of _____________
Correct : C. algae
66. Activated sludge usually employs an aeration period of ________________
Correct : D. 4-8 hours
67. Trickling filter is used in which of the following wastewater treatment processes?
Correct : B. Secondary treatment
68. Belt filter presses are used in which of the following process?
Correct : C. Dewatering
69. Which of the following gases are produced in large amounts during sludge digestion?
Correct : A. methane
70. Biological process is used to remove _______
Correct : C. Dissolved solids
71. What is the wastewater called as after physical and biological removal of solids?
Correct : D. Secondary treated wastewater
72. What is the monthly concentration of solids produced by secondary sewage effluent?
Correct : B. 30 mg/l
73. What is the expected BOD removal after both primary and secondary treatment?
Correct : B. 85%
74. What is the percentage removal of BOD by stabilization ponds?
Correct : C. 65%
75. Which of these is not an advantage of a trickling filter?
Correct : A. Temperature
76. The secondary clarifiers are ________
Correct : A. Circular
77. Which of the following is not commonly used as a filter material in the treatment of water?
Correct : C. Crushed rock
78. Which of the following is correct regarding the cheapest filter material used in water treatment?
Correct : A. Sand>Anthracite>Garnet sand
79. The uniformity characteristics of sand expressed in terms of __________
Correct : B. Effective size and uniformity coefficient
80. ____ represents the size of sand particle such that 10% of particles are finer than this size.
Correct : C. D10
81. What is CU in the expression CU= D60/D10 where D60 and D10 are the sizes of particle such that 60%
and 10% of the particles are finer than these sizes respectively?
Correct : C. Uniformity coefficient
82. The effective size of sand of the slow sand filter is __________
Correct : B. 0.2-0.3mm
83. What is the value of specific gravity of sand filter?
Correct : B. 2.6
84. The value of uniformity coefficient for uniformly graded sand is ______
Correct : B. 1
85. The value of specific gravity for Garnet sand is ____
Correct : C. 4.2
86. Which of the following statement is correct?
Correct : C. The range of CU for the slow sand filter is 3-5
87. In which process of water softening, ion exchange phenomenon takes place?
Correct : B. Zeolite process
88. In which process of water softening, the chemicals are added to remove hardness from water?
Correct : A. Lime soda process
89. Zeolites are complex compound of ____________
Correct : C. Aluminium, silica and soda
90. The color of the artificial zeolite permutit is ____________
Correct : D. White
91. Natural zeolite is mainly processed from ____________
Correct : B. Green sand
92. The color of the natural zeolite is ____________
Correct : A. Green
93. The chemical formula of Permutit is ____________
Correct : B. SiO2Al2O3Na2O
94. Permutit has an exchange value of ________ grams of hardness per m3 of zeolite.
Correct : C. 35,000-40,000
95. The thickness of the layers of filter sand of zeolite softener is ____________
Correct : D. 100cm
96. Which of the following is a disadvantage of the zeolite process?
Correct : C. Suspended impurities get deposited around the zeolite particles
97. Water is mainly used in boilers for the generation of ________________
Correct : C. Steam
98. Which of the following should not be a composition of boiler-feed water?
Correct : D. Its caustic alkalinity should be 1.5-2 ppm
99. Which of the following is not a result of the excess of impurity in boiler-feed?
Correct : B. Decomposition
100. If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hard
and adhering on the inner wall, it is called _____________