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Waste finals
I. Multiple Choice
1. Ethanolamine is an absorbant used for the removal of ________ from air/gas.
a. HF
b. H2S
c. SOx
d. b&c
2. Which of the following caused death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable
concentration (i.e. > 50 ppm)?
a. benzopyrene
b. peroxyacyl nitrate
c. SOx
d. CO
3. Which of the following is not a source of ozone emission in the atmosphere?
a. refrigerants
b. Xerox machine
c. dermatological phototherapy equipment
d.
High voltage
electrical equipment
4. Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased
by the __.
a. forestation
b. precipitation
c. greenhouse effect d. vegetation
5. Mercury as a pollutant can enter the blood stream & the digestive system/lungs and is responsible for causing ___
disease.
a. Itay-itay
b. Alzheimer’s
c. Minimata
d. Elephantiosis
6. Which of the following gases is having the widest explosion limits (about 2 to 81% gas in gas-air mixture), rendering it
the property of the most explosive gas?
a. hydrogen
b. acetylene
c. ammonia
d. CO
7. Presence of high concentration of ozone and smog in atmospheric air causes the
a. embrittlement and disease of folding resistance of paper
b. cracking of rubber products
c. fading of dye on textiles
d. damage of electrical insulator on high tension power line
8. Thermal pollution due to excessive heat and temperature in the working place causes
a. reduction in working
b. fatigue
c. high breathing rate
efficiency of manpower.
9. Which of the following air pollutants is not toxic to vegetation?
a. smog & O3
b. HF & NOx
c. SOx & spray of weed killers

d. a,b,&c

d. CO

10. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is
maximum?
a. idle running
b. acceleration
c. cruising
d. deaccelaration
11. Main pollutants released from iron & steel industry is
a. CO, CO2 & SO2
b. H2S, NO & SO3
c. CO2, H2S, & NO2

d. SO2, NO2, & CO2

12. Dust collection efficiency of a cyclone separator depends upon its
a. overall height
b. inlet gas velocity
c. diameter

d. all of these

13. The following government agencies have powers and functions wrt Air Quality Management and Control Program
except____.
a. DOH
b. DOTC
c. DTI
d. DOE
14. All of these places are classified as “public areas” where smoking is banned except _____.
a. colleges and universities
b. gas stations
c. hospitals
d. all areas of restaurants

15. Most efficient and suitable dust removal equipment for removal of fly ash from flue gas in a thermal power plant is the
a. gravity settling chamber
b. cyclone separator
c. electrostatic precipitator
d. bag
filter
16. The discontinued production and use of CFCs and its products was done by different countries as a response to the
_____.
a. Montreal Protocol b. Agenda 21
c. Kyoto Protocol
d. Basel Convention
17. Which of the following dust collection equipment is the least efficient (for sub-micronic particles)?
a. dust catcher (gravity type) b. cyclone separator
c. bag filter
d. hollow wet scrubber
18. The pressure drop in a bag filter is proportional to the _____.
a. viscosity & density of the gas b. pressure of the gas c. particle size d. a&b
19. Removal of __________ is accomplished by aeration of water.
a. dissolved gases
b. suspended solids
c. dissolved solids
d. settleable solids
20. Disinfection of water may be done by the use of
a. ozone and iodine
b. chlorine or its compound

c. ultraviolet light
for irradiation of water

d. all of these

21. What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy
and meat packing industries?
a. Radioactive substances
b. Natural organic products c. Inorganic pollutants d. None of these
22. Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m2/hr.
a. 0.1 to 1
b. 3 to 6
c. 10 to 15

d. 15 to 20

23. Maximum permissible residual chlorine in treated water should be __________ mg/litre.
a. 0.001 to 0.01
b. 0.2 to 0.3
c. 2 to 3
d. 5 to 10
24. Oil impurities present the effluent discharged from the electroplating industry is normally not removed by
a. chemical coagulation
b. floatation & skimming
c. centrifugation
d. ultrafiltration
25. The function of skimming tank in sewage treatment is to remove __________ substances.
a. dissolved solid
b. suspended solid
c. oil & fatty
d. gritty & inorganic
26. During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
a. filtration
b. digestion
c. sedimentation
d. both (b) and (c)
27. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter
from the polluted water stream?
a. Sedimentation tank b. Circular clarifier
c. Mechanical flocculation
d. Chemical
coagulation
28. Which is the best and the most effective method for the removal of organic contaminant present in the polluted water
in very small quantity (say < 200 mg/litre)?
a. Lagooning
b. Activated carbon adsorption
c. Biological oxidation pond
d. Chemical
coagulation
29. Turbidity of water is an indication of the presence of
a. suspended inorganic matter
b. dissolved solids
gases
30. Free oil from a petroleum refinery oil is removed by

c. floating solids

d. dissolved

a. biological oxygen pond.
b. aerated lagoons.
oil skimming devices.

c. trickling filters.

d. gravity separator having

31. Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in
concentration
of less than 100 mg/litre can be removed by
a. biological oxygen pond
b. chlorination
c. trickling filters
d. chemical
coagulation
32. It is the settled floc (coagulated particles) which is being removed from the water after filtration
a) sediments
b) sludge
c) coagulates
d) ash
33. Which of the following is not a characteristic of a solid waste?
a) composition
b) density
c) energy content
d) porosity
34. Which of the following is not a requirement of a sanitary landfill?
a) methane monitoring
b) groundwater monitoring
c) leachate treatment
d) aerator
35. Which of the following is not a cause of solid waste problem?
a) rapid exponential population growth
b) globalization
c) industrialization
d) urbanization
36. Which of the following is not considered as special waste?
a) construction debris
b) leaves & street litter
c) abandoned automobiles
d) no answer
37. Leachate treatment is done using ____ process.
a) physical
b) biological
c) chemical
d) Bioremediation
38. It is the water that percolates through a landfill and contains contaminating substances.
a) seepage
b) leakage
c) leachate
d) Spillage
39. It is the most favored means of disposal wherein wastes are often burned to minimize the volume of waste after the
implementation of Philippine Clean Air Act.
a) dump site
b) incinerator

c) digester
d) sanitary land fill
40. It is a treatment process that utilizes microorganisms to turn organic matter into CO 2 and more microorganisms
through respiration and synthesis.
a) physical
b) biological
c) digester
d) sanitary land fill
41. What are the methods of treatment & disposal of radioactive wastes?
a) evaporation & chemical precipitation
b) biological methods & adsorption in ion exchange materials
c) fixing into solid mass w/ cement and sinking deep in the sea
d) a,b & c
42. Which of the following radioactive wastes emits all alpha, beta & gamma and hence is the most hazardous of all
radioactive emitters?
a) I-131
b) Sr-90
c) Au-198
d) Ra-226
43. It bears the costs for the proper storage, treatment and disposal of their hazardous waste.
a) source
b) generator
c) treater
d) transporter
44. It is hazardous waste classification that refers to commercial or industrial hazardous waste incinerators.
a) Class A
b) Class B
c) Class C
d) Class D
45. It refers to friction sensitive substances like solvents & ignition triggered by static electricity.
a) toxicity
b) ignitability
c) corrosivity
d) reactivity
46. Which of the following is not a potentially hazardous waste from manufacture of metals?
a) organic chlorine compounds
b) phenols
c) cyanides
d) abrasives
47. Which of the following principles is not a pillar of Environmental Policy in EMS?
a) compliance
b) prevention
c) cost effective
d) improvement
48. Environmental Management Program details include the following except ______.
a) what must be done & by whom
b) how & when to execute

c) define objective & targets of high priority
d) no answer
49. Which of the following examples of potential hazard manifestation is not categorized as Global Hazard?
a) Global Warming
b) Aquatic Toxicity
c) Acid Rain
d) Ozone Depletion
50. Rating of risk involves these parameters except _______.
a) Probability
b) Detection
c) Control
d) Seriousness
II. TRUE OR FALSE. RIGHT MINUS WRONG.
1.
2.
3.
4.

Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions. TRUE
SPM/TSP is not a weightless pollutant. TRUE
Low ozone layer thickness in Polar Regions is due to cold climate conditions. TRUE
Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a

four stroke engine. TRUE
5. High concentration of CO2 in the atmosphere allows visible solar radiation (ultraviolet) of short wave-length to
pass through. TRUE
6. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant
compound known as peroxy acetyl nitrate (PAN) or methyl nitrile. TRUE
7. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust.
TRUE
8. Reinglemann chart is used for the measurement of the smoke density from a chimney. TRUE
9. In large thermal power stations very fine particulates present in flue gas are removed by electrostatic precipitators.
10.
11.
12.
13.
14.
15.
16.
17.

TRUE
Silica gel is adsorbent for removal of nitrogen oxides from gas/air. TRUE
The average thickness of ozone layer in stratosphere is about 230 dobson unit (DU). TRUE
White smoke coming out of the chimney of a furnace indicates the use of very high excess air. TRUE
Prolonged exposure of human being to NO2 causes bronchitis. TRUE
Each atom of chlorine liberated from CFC is capable of decomposing 10^5 molecules of ozones. TRUE
A slight haze at the top of chimney indicates good combustion if the furnace. TRUE
Presence of pathogenic bacteria in water causes diseases like typhoid. TRUE
The amount of chemical coagulant for treatment of polluted water decreases with increase in temperature of the

polluted water to be treated. TRUE
18. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring
19.
20.
21.
22.
23.
24.

bacterial growth. TRUE
Fresh sewage is alkaline in nature. TRUE
In a sedimentation tank, the detention period for water ranges from 2-4 hours. TRUE
EDTA is a standard test for determination of hardness in water. TRUE
TLV of lead for public sewer/waste water is about 1 ppm. TRUE
In sewage treatment, the detention period allowed for oxidation ponds ranges from 4-5 weeks. TRUE
Coal mines drainage waste water (acidic in nature) is neutralized by alkali treatment. TRUE

25. High noise levels produced during operation of fans and compressors at STP can be reduced by mufflers
(silencers). TRUE

26. Alum is the most commonly used chemical coagulant in water treatment. TRUE
27. Inorganic substances present in sewage are removed in grit chamber during sewage treatment. TRUE
28. Aerobic treatment of leachate has less sludge production and has reduced energy needs. FALSE
29. Biostimulation of indigenous microbial pop-ins in soils & or ground water may be done in or ex situ. TRUE
30. Composting is an aerobic treatment decomposition of organic matter by microorganisms (bacteria & fungi) into a
nutrient-rich, stable humus material. TRUE
31. Solid wastes are usual vectors (carriers) for disease transmission. TRUE
32. Anaerobic conditions are maintained in composting to avoid objectionable odor. FALSE
33. Municipal solid waste contains above 50% volatile (combustible) matter, with roughly equal proportions of
moisture & inert solids. TRUE
34. Refusal to allow lawful inspection conducted by the DENR thru EMB of duly authorized personnel is one of the
grounds for suspension or revocation of permits. TRUE
35. Indiscriminate parking of old and unused vehicles in front of your house is classified as dumping. TRUE
36. Waste generator determines if wastes are hazardous or not. TRUE
37. Ashes collected in incinerator may contain heavy metals. TRUE
38. Dioxin is one of the dirty dozen pollutants identified at the Basel Convention. TRUE
39. POP’s are hydophillic. FALSE
40. All industries need to conduct EIA. FALSE
41. In EIA, it is best to consider all impact zones from primary to secondary and even to tertiary. TRUE
42. Wastewater treatment plant design and Material Recovery Facility design must be included as attached documents
in EIS. TRUE
43. Terms of Reference in EIA shall always include all the demands of the stakeholders. FALSE
44. Royalty in EIA is always in monetary form. FALSE
45. Government will be the mediator between the stakeholders and the proponent in the Scoping process in EIA.
TRUE
46. EMS is strategy-driven not compliance-driven. TRUE
47. One of the key benefits on management in EMS is the balance of economic and environment interests in a
company. TRUE
48. ISO14000 accreditation is mandated. FALSE
49. Environmental policy should be written clearly and concisely and be made publicly available. TRUE
50. During planning in the preparation of Environmental Management Plan, system boundaries should be identified.
TRUE

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