1. The maximum permissible turbidity for drinking water
Correct : C. 15 - 25 ppm
2. Per capita consumption of water is usually taken as
Correct : B. 150 - 300 litres
3. The incubation period of Typhoid bacillus causing typhoid fever is
Correct : C. 7 to 21 days
4. Which of the following has least wave-length?
Correct : A. Cosmic rays
5. The most injurious components of automobile exhaust for environment are
Correct : A. Carbon monoxide and Carbon dioxide
6. The main disadvantage of hard water is
Correct : E. Increased soap consumption
7. Which of the following area of work needs highest level of illumination?
Correct : D. Clothing factory
8. The speed of sound through water is nearly
Correct : C. 1500 m/s
9. Protection from radiations is possible through
Correct : D. All of the above
10. Short circuit means
Correct : A. Direct flow of current between two points of different potential
11. Swimming pool water requires
Correct : D. de-chlorination
12. Mycotoxins are poisonous chemicals produced by
Correct : C. molds
13. The maximum permissible level or pesticides, in general, in drinking water is nearly
Correct : A. 1 to 50 ppm
14. The percentage of carbondioxide in atmospheric air is nearly
Correct : C. 0.032 percent
15. Turbidity in water is due to
Correct : D. Finely divided particles of clay, silt and organic matter
16. The emission of oxides of nitrogen in automobile exhaust will be least when the vehicle is
Correct : A. Idling
17. Mottling of teeth is associated with the presence of
Correct : E. Fluorides in water
18. The average percentage of carbon and hydrogen in petrol may be roughly given as
Correct : B. 85% C, 15% H2
19. Sulphurdioxide can be measured by
Correct : D. Any of the above
20. Brackish taste of water is due to
Correct : A. Chlorides of sodium
21. Which of the following is unlikely to be the pollutant from a sulphuric acid plant?
Correct : D. Hydrogen sulphide
22. Which of the following is the major source of flyash emission?
Correct : D. Power plants
23. The process of killing the ineffective bacteria from the water and making it safe for use is known as
Correct : A. Disinfection
24. Theodolite is used by
Correct : A. Surveyors
25. Which of the following space needs maximum number of air changes per hour?
Correct : B. Restaurants
26. Water with least contamination can be be obtained from
Correct : E. Spring along the hill slope
27. Which of the following chemical is least poisonous?
Correct : C. Sodium
28. Disinfection of drinking water means removal of
Correct : E. Bacteria
29. Scintillation counter can detect
Correct : D. All of the above
30. Lead is a cumulative poison which ends up in
Correct : C. bones and tissues
31. Which of the following area of work needs lowest noise level?
Correct : C. Library
32. The hardness limit for portable water ranges between
Correct : C. 75 - 117 ppm
33. The process used for the removal of dissolved carbondioxide from the water, is known as
Correct : C. Aeration
34. Which of the following automobile will provide least pollution problems
Correct : E. Battery powered
35. Out of the following diesel engines, the minimum air consumption per BHP will be in
Correct : A. 4 stroke mechanical injection
36. The bad smell due to decomposition of sewage, on account of the action of bacteria, is mainly due to the presence of
Correct : D. Hydrogen sulphide
37. The permissible level of HCN in drinking water is
Correct : A. Less than 0.01 mg/litre
38. The chloride content in the water for public supplies should not exceed
Correct : A. 250 mg/litre
39. Which of the following fuel has maximum resistance to detonation?
Correct : C. Iso-octane
40. The most frequent method of bacterial reproduction is by
Correct : A. Cell division
41. Normally the colour of exhaust from a diesel engine is
Correct : A. black
42. Geiger Muller counter can detect
Correct : D. All of the above
43. Which of the following radio-nuclide has the shortest half life?
Correct : D. Iodine 131
44. The becteria that can survive without oxygen is called
Correct : A. Facultative bacteria
45. Bit is the unit of
Correct : B. Memory of computer
46. The speed of sound will be maximum through
Correct : D. Aluminium
47. Dark, black smoke from diesel engines usually results when engine is
Correct : E. Running at full load and full speed
48. The noise level due to auto horn may be of the order of
Correct : A. 110 dB
49. Which one among the following terms best describes the method of converting a spherical surface into a plane surface?
Correct : B. Projection
50. Small concentrations of fluorides in water
Correct : A. reduce the prevalence of dental caries
51. The disadvantage of hard water is
Correct : E. All of the above
52. The permissible hardness of water for public supplies is
Correct : D. 115 mg/litre
53. For the combustion of 1 kg of carbon, the quantity of oxygen required is
Correct : A. 2.62 kg
54. For controlling algae, the chemical generally used is
Correct : C. copper sulphate
55. Soft waters
Correct : D. All of the above
56. What will be the colour of red rose when it is seen through green glass?
Correct : D. Brown
57. Acute poisoning may be the result of entry into the body of large of concentrated doses of poison through
Correct : E. Any of the above
58. Carbondioxide has all the following properties EXCEPT that it is
Correct : D. readily soluble in water
59. The number of air changes per hour recommended for auditoria is
Correct : A. 3 to 6
60. Identify the incorrect statement if any Zeolite process is suitable for
Correct : D. Acidic waters
61. Which of the following constituent of air has the least percentage?
Correct : C. Xenon
62. While smoke from a diesel engine can be expected during
Correct : A. Start up or idling
63. If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that
Correct : D. Organic matter is present in water
64. Plants that grow in absence of sublight in water, are called
Correct : C. Fungi
65. Which one of the following gases shows a different behaviour at high pressure?
Correct : C. Hydrogen
66. Bleaching power is
Correct : E. Hypo-chlorite of lime
67. The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is
Correct : C. 3
68. The percentage of nitrogen in air by weight is around
Correct : A. 75.5 percent
69. What is a laser?
Correct : D. Light amplification by stimulated emission of radiation
70. All of the following pollutants affect heart EXCEPT
Correct : B. Arsenic
71. The permissible hardness of water for low pressure boiler is
Correct : A. 50 mg/litre
72. Desalination is usually needed for
Correct : C. sea water
73. To keep the water safe against pathogenetic bacteria the residual chlorine should remain between
Correct : A. 0.05 to 0.2 ppm
74. Which of the following industry is least polluting?
Correct : D. Electronic industry
75. Carbon monoxide poisoning may cause
Correct : D. Any of the above
76. When the trees are planted by road side, the average distance between two trees should be
Correct : C. 10 to 15 metres
77. Addition to alum increases
Correct : D. Acidity of water
78. If the pH of water is 7 it means the water is
Correct : C. neutral
79. The volume fraction of ozone in atmospheric air is nearly
Correct : A. 0.02 ppm
80. Suspended liquid droplets generated by condensation from the gaseous to the liquid state or by breaking up a liquid into a dispersed state is known as
Correct : C. Mist
81. The maximum acceptable noise level in offices is
Correct : B. 40 dB
82. Type of radiation expected from earbon 14 is
Correct : B. Beta
83. The pH value of sea water is usually
Correct : D. Between 8 and 8.3
84. Which of the following is the major source of pollutant hydrogen sulphide?
Correct : A. Decaying organic matter
85. The pH value of concentrated sulphuric acid could be expected between
Correct : E. 1 and 0
86. Ultra-violet rays are used for the treatment of water known as
Correct : B. Disinfection
87. The process of kolling at the pathogenic bacteria of water-borne diseases to make it safe for hospital use, is known as
Correct : C. Sterilization
88. Electric fuses provide protection against
Correct : B. overloads
89. In one litre sample of drinking water the coliform organism should not exceed
Correct : D. 10
90. When the trees are to be planted by the road side the minimum distance from the out edge of side width should be
Correct : B. 2 to 3 metres
91. All of the following are souhd obsorptive materials EXCEPT
Correct : B. Mirrors
92. Which of the following pollutant results from decaying organic matter?
Correct : C. Ammonia
93. All of the following pollutants result from auto-exhaust EXCEPT
Correct : A. Acetylene
94. Dust particles in industrial processes may be generated by
Correct : E. Any of the above processes
95. Turbidity in water may be removed by
Correct : A. Sedimentation
96. Which of the following area of work needs lowest level of illumination?
Correct : D. Paper converting processes
97. Which one of the following is not directly related to the phenomenon of evaporation?
Correct : B. Volume of the liquid
98. For the maximum acidity of water, pH value would be
Correct : A. 0.01
99. The process of passing the water through a thick layer of filtering media is known as
Correct : B. Filtration
100. Which of the following is an insect born disease?