1. : The minimum value of DO required for water to be pure is:
(A) 1 ppm
(B) 2 ppm
(C) 3 ppm
(D) 4 ppm
2. : Which value of COD will indicate more polluted water?
(A) Low value
(B) Both values
(C) Higher value
(D) All of these
3. : Biodegradable pollutant is:
(A) Plastic
(B) Sewage
(C) Asbestos
(D) Mercury
4. : Water is often treated with chlorine to:
(A) Increase oxygen content
(B) Remove suspended particles
(C) Remove hardness
(D) Kill germs
5. : Permanent hardness of water is due to
(A) Sulphate of Ca
(B) Sulphate of Mg
(C) Chloride of Ca
(D) All of these
6. : Temporary hard water is softened on industrial scale by adding
(A) Ca(OH)₂
(B) Mg(OH)₂
(C) KOH
(D) NaOH
7. : Permanent hard water is softened by addition of
(A) MgCO₃
(B) CaCO₃
(C) Na₂CO₃
(D) BaCO₃
8. : Water pollution is due to
(A) Industrial effluents
(B) Sewages and other wastes
(C) Agricultural discharges
(D) All of these
9. : Water is often treated with chlorine to
(A) Kill germs
(B) Increase oxygen content
(C) Cause sedimentation
(D) Remove insoluble impurities
10. : The presence of which in drinking water is responsible for mottling of teeth?
(A) Mercury
(B) Fluorine
(C) Chlorine
(D) Iodine
11. : Which water requires zero hardness?
(A) Boiler feed water
(B) Dyeing water
(C) Paper mill water
(D) Laundry water
12. : Which process is not physical in nature?
(A) Mixing
(B) Activated sludge process
(C) Sedimentation
(D) Flocculation
13. : Which is not a physical characteristic of water?
(A) Smell
(B) Odor
(C) Chlorine contents
(D) Color
14. : Which is not a chemical characteristic of water?
(A) pH
(B) Color
(C) BOD
(D) COD
15. : Which is not a biological characteristic of water?
(A) Animals
(B) Viruses
(C) Plants
(D) COD
16. : Which compounds have fishy odor?
(A) Amines
(B) Organic sulphides
(C) Ammonia
(D) Carboxylic acids
17. : Which oxidizing agent is aidful and used in COD test?
(A) KCl
(B) K₂Cr₂O₇
(C) CH₃COOH
(D) H₂SO₄
18. : Ground water is threatened with pollution from which kind of wastes?
(A) Domestic wastes
(B) Agricultural wastes
(C) Industrial wastes
(D) All of these
19. : Which statement is not true regarding harmful effects of ground water pollution?
(A) It causes lung cancer
(B) It aids to prevent epidemics
(C) It causes typhoid, dysentery and diarrhea
(D) It causes jaundice
20. : Which statement is not related with the effect of thermal pollution?
(A) Reduction in DO
(B) Increase in BOD
(C) Decrease in BOD
(D) Excessive eutrophication
21. : Which statement is not true regarding radioactive pollutants?
(A) Carcinoma and breast cancer
(B) Leukemia
(C) Somatic and genetic disorders
(D) Increases biological immune system
22. : Which techniques are aidful and used for minimizing water pollution?
(A) Stabilization of ecosystem
(B) Waste treatment
(C) Recharge of the waste
(D) All of these
23. : The expected specific waste of food industry is
(A) Meats
(B) Bones
(C) Fats or oil
(D) All of these
24. : The expected specific wastes of textile industry is
(A) Dyes
(B) Fiber residue
(C) Cloth residue
(D) All of these
25. : Which of the following is the expected specific waste of paper and allied products industry?
(A) Chemicals
(B) Inks
(C) Paper and fiber residues
(D) All of these
26. : Which disposal method is aidful and used for municipal wastes?
(A) Recycling
(B) Composting
(C) Compaction
(D) All of these
27. : Which of the following is the Chief source of water and soil pollution?
(A) Mining of ores
(B) Agro-industry
(C) Thermal power plant
(D) All of these
28. : Eutrophication is process which involves ______
(A) Depletion of ozone layer
(B) Decrease in the concentration of dissolved oxygen in water by algae
(C) Increase in the concentration of ozone in water
(D) Decrease in the level of SO2 in air
29. : Which cause pollution?
(A) Smoke/fly ash
(B) Automobile exhausts
(C) Silt and pesticides
(D) Aero planes
30. : Disease caused by eating fish found in water contaminated with industrial waste having mercury is
(A) Minamata disease
(B) Bright’s disease
(C) Hashimoto’s disease
(D) Osteosclerosis
31. : Maximum desirable concentration of fluorides according to international standard is
(A) 10-100 ppm
(B) 100-200 ppm
(C) 1 ppm
(D) 10-20 ppm
32. : Fish die in water bodies polluted by sewage due to Which of the following?
(A) Smell
(B) Clogging of gills by silt
(C) Reduction in dissolved oxygen
(D) Pathogens
33. : Drained sewage has B.O.D.
(A) Equal to that of water
(B) Less than that of water
(C) More than that of water
(D) None of these
34. : Which is a mode of controlling pollution in big cities?
(A) Broader roads and shifting of factories out of the residential areas
(B) Proper disposal of organic wastes, sewage and industrial effluents
(C) Cleanliness and less use of insecticides
(D) All of these
35. : Domestic waste mostly constitutes
(A) Biodegradable pollution
(B) Non-biodegradable pollution
(C) Effluents
(D) Air pollution
36. : Detergents are known to pollute rivers and water ways. However, detergents can be made biodegradable and pollution free by taking
(A) Cyclic hydrocarbon chain
(B) Unbranched hydrocarbon chain
(C) Shorter hydrocarbon chain
(D) Hydrocarbon with more branching
37. : Which factors aid to measure quality of water?
(A) BOD
(B) DO
(C) COD
(D) All of these
38. : In the purification of portable water the coagulant aidful and used is:
(A) Copper sulphate
(B) Nickel sulphate
(C) Alum
(D) Barium sulphate
39. : Which statements is not related with principal requisites of water for industrial purposes?
(A) It should be hard as possible and does not contain nitrate
(B) It contains less quantity of line
(C) It should not contain iron
(D) It should be pure and cool
40. : Which of the following is the water that easily forms a lather of films and froths when agitated with a soap solution?
(A) Hard water
(B) Heavy water
(C) Soft water
(D) Distilled water
41. : Which of the following is the water that does not form a lather of films when agitated with a soap solution?
(A) Deionized water
(B) Soft water
(C) Heavy water
(D) Hard water
42. : BOD refers to:
(A) Total oxygen demand of biosphere
(B) Biological oxygen deficit
(C) Biological oxygen demand of polluted water
(D) None of these
43. : Phosphate pollution is caused by:
(A) Weathering of phosphate rocks only
(B) Sewage and agricultural fertilizers
(C) Phosphate rocks and sewage
(D) Carbon dioxide dissolved in water
44. : Which substance not present in acid rain?
(A) Acetic acid
(B) Nitric acid
(C) Sulphurous acid
(D) Sulphuric acid
45. : Water pollution is mainly due to which?
(A) Sulphur dioxide
(B) Carbon dioxide
(C) Industrial effluents
(D) Oxygen
46. : COD refers to:
(A) Catalyzed oxidation of diamond
(B) Chemistry of diamonds
(C) Chemical oxygen demand
(D) Catalyzed oxidation of dissolved salts
47. : Spraying of DDT produces pollution of:
(A) Air, water and soil
(B) Air and water
(C) Air and soil
(D) Air
48. : Fluorosis, the bone disease, is caused by the presence of:
(A) Pesticides in water
(B) Carbon monoxide in air
(C) Fluorides in water
(D) Sulphur dioxide in air
49. : The hardness of water is because of the presence of dissolved soluble salts of:
(A) Iron
(B) Magnesium
(C) Calcium
(D) All of these
50. : Which statement is not true regarding hardness of water?
(A) It is due to soluble salts of Ca
(B) It is due to soluble salts of Na
(C) It is due to soluble salts of Mg
(D) It is due to soluble salts of Fe
51. : Temporary hardness of water is due to:
(A) Carbonates of Ca
(B) Bicarbonates of Na
(C) Bicarbonates of K
(D) Bicarbonates of Cs
52. : Which environmental problem could lead to a rise in sea level?
(A) Acid rain
(B) Cutting down the trees in the rain forests
(C) Global warming
(D) Damage to the ozone layer
53. : Which of following is not a type of pollution for water bodies?
(A) Heat
(B) Organic metallic compounds
(C) Heavy metals
(D) None
54. : EPA stands for?
(A) Environmental protection agency
(B) Environmental protection agreement
(C) Element protection agreement
(D) All of these
55. : ISO stands for?
(A) International Organization for Standardization
(B) International Standard Organization
(C) International Science organization
(D) All
56. : Which pollutants does not leave a residue?
(A) Air pollutant
(B) Chemical pollutant
(C) Noise pollutant
(D) Soil pollutant
57. : In plant noise control, which method is aidful and used for reducing noise?
(A) Control of the transmitted noise
(B) Control at the source
(C) Plant planning
(D) All of these
58. : The maximum noise level at which a man can work for hours is:
(A) 80 dB
(B) 90 dB
(C) 60 dB
(D) 70 dB
59. : The unit of sound pressure level is:
(A) Decibel
(B) Pascal
(C) Newton
(D) Ampere
60. : The range of sound pressure for uncomfortable level is:
(A) 130-140 dB
(B) 100-120 dB
(C) 80-90 dB
(D) 50-90 dB
61. : Which is non-auditory effect of noise on human body?
(A) Wakening of the colored vision
(B) Increase in the blood pressure
(C) Changes in the vascular tone
(D) All of these
62. : Which is/are non-point source(s) of water pollution?
(A) Emission from transport vehicles
(B) Urban runoff
(C) Agricultural runoff
(D) All of these
63. : Which is/are source(s) of water pollution?
(A) Fertilizers and pesticides
(B) Sewage and domestic wastes
(C) Industrial wastes
(D) All of these
64. : Which is/are causes of eutrophication?
(A) Sewage discharge
(B) Animal feeding operations
(C) Fertilizers
(D) All of these
65. : Which statements is/are true with regard to the effect of eutrophication?
(A) Load of fungi and bacteria
(B) Generation of H2S gas causing foul smell
(C) Increase in BOD value
(D) All of these
66. : Which steps is/are involved in the primary treatment of wastewater?
(A) Sedimentation
(B) Reduction in the size of trash and solid particles
(C) Grit scum removal
(D) All of these
67. : Which materials is/are POP?
(A) Diladrin
(B) DDT
(C) Aldrin
(D) All of these
68. : Which materials is/are POP?
(A) Heptachlor
(B) Endrin
(C) Polychlorinated biphenyls (PCBs)
(D) All of these
69. : Which molds secrete aflatoxins which are poisonous and cancer causing chemicals?
(A) Aspergillus niger
(B) Aspergillus parasiticus
(C) Aspergillus flavus
(D) Both B and C
70. : Which steps is/are involved in the secondary treatment of wastewater?
(A) Coagulation/flocculation of colloidal organic matter
(B) Oxidation of dissolved organic matter
(C) Degradation of nitrogenous matter
(D) All of these steps
71. : The dissolved organic matter of the wastewater is removed by biological process involving bacteria. This step is related to which treatment of wastewater:
(A) Tertiary treatment
(B) Secondary treatment
(C) Primary treatment
(D) All of these steps
72. : Which treatment is the best for degradation of organic/colloidal matter of wastewater?
(A) Activated sludge
(B) Rotation biological reactors
(C) Trickling filters
(D) None of these
73. : Tertiary treatment is generally aidful and used to treat which?
(A) Suspended solids
(B) Dissolved inorganic compounds
(C) Dissolved organic compounds
(D) All of these
74. : Which is/are causes of soil/land pollution?
(A) Oil spills
(B) Acid rain
(C) Deforestation
(D) All of these
75. : Which treatment is/are effective in controlling soil/land pollution?
(A) Proper solid waste treatment
(B) Contribution of less waste to soil/land
(C) Reduction in the use of fertilizers/pesticides
(D) All of these
76. : Which statements is/are true regarding green chemistry?
(A) Reduction in the adverse environmental impacts by proper choice of materials
(B) Development of processes based on renewable raw materials
(C) Development of processes that are less prone to release of toxic chemicals
(D) All of these
77. : Which statements is/are true regarding green chemistry?
(A) Use of green solvents
(B) Design of energy efficient process
(C) Development of processes based on atom economy
(D) All of these
78. : Which statements is/are true regarding green chemistry?
(A) Development of pharmaceuticals
(B) Development of enzyme membrane reactors
(C) Development of biodegradable materials
(D) All of these
79. : Which materials is/are carcinogen?
(A) Benzedrine
(B) Ethylene dichloride
(C) Polycyclic aromatic hydrocarbons
(D) All of these
80. : The range of sound pressure which is painful is:
(A) 130-140 dB
(B) 80-90 dB
(C) 90-80 dB
(D) 100-120 dB
81. : Human hearing is sensitive to frequency in the range of about:
(A) 10,000-20,000 Hz
(B) 20-20,000 Hz
(C) 10-10,000 Hz
(D) 10,000-30,000 Hz
82. : A high frequency sound has frequency:
(A) 100 Hz
(B) 500 Hz
(C) 300 Hz
(D) 200 Hz