1Which of the following is considered a secondary pollutant?
A.Sulfur dioxide ()
B.Carbon monoxide ()
C.Ground-level Ozone ()
D.Nitrogen dioxide ()
Correct Answer: Ground-level Ozone ()
Explanation:Primary pollutants are emitted directly from a source (like or ). Secondary pollutants form when primary pollutants react in the atmosphere. Ground-level ozone is formed by the reaction of sunlight on air containing hydrocarbons and nitrogen oxides.
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2What is the primary cause of Minamata disease?
A.Lead poisoning
B.Methylmercury poisoning
C.Cadmium poisoning
D.Arsenic contamination
Correct Answer: Methylmercury poisoning
Explanation:Minamata disease is a neurological syndrome caused by severe mercury poisoning. It was first discovered in Minamata city in Japan, where methylmercury was released in industrial wastewater.
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3Which gas has a much higher affinity for hemoglobin than oxygen, causing asphyxiation?
A.Carbon dioxide ()
B.Carbon monoxide ()
C.Methane ()
D.Nitrogen ()
Correct Answer: Carbon monoxide ()
Explanation:Carbon monoxide () binds to hemoglobin approximately 200–250 times more effectively than oxygen does, forming carboxyhemoglobin, which prevents blood from carrying oxygen to tissues.
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4Biological Oxygen Demand (BOD) is a standard measure of:
A.The amount of oxygen in the atmosphere
B.The amount of oxygen required by aquatic plants
C.The amount of dissolved oxygen needed by aerobic biological organisms to break down organic material
D.The total amount of bacteria in water
Correct Answer: The amount of dissolved oxygen needed by aerobic biological organisms to break down organic material
Explanation:BOD measures the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic conditions. High BOD indicates high water pollution.
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5Which of the following describes the phenomenon of Eutrophication?
A.Depletion of the ozone layer
B.Nutrient enrichment of water bodies leading to algal blooms
C.Accumulation of heavy metals in soil
D.Increase in global temperatures
Correct Answer: Nutrient enrichment of water bodies leading to algal blooms
Explanation:Eutrophication is the process by which a water body becomes overly enriched with minerals and nutrients (mostly nitrates and phosphates), which induces excessive growth of algae (algal bloom), depleting oxygen levels.
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6The presence of Blue Baby Syndrome (Methemoglobinemia) in infants is associated with high levels of which contaminant in drinking water?
A.Lead
B.Fluoride
C.Nitrates
D.Arsenic
Correct Answer: Nitrates
Explanation:High levels of nitrates in drinking water are converted to nitrites in the digestive system, which interfere with the oxygen-carrying capacity of the child's blood, causing the skin to turn blue.
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7Which unit is used to measure the intensity of noise?
A.Hertz ()
B.Decibel ()
C.Dobson Unit ()
D.Pascal ()
Correct Answer: Decibel ()
Explanation:Noise intensity or sound pressure level is measured in decibels (). Hertz measures frequency, while Dobson Units measure ozone concentration.
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8What is the generally accepted 'safe' limit of sound level in residential areas during the day, according to WHO standards?
A.45
B.55
C.75
D.90
Correct Answer: 55
Explanation:The World Health Organization (WHO) and many national pollution control boards recommend a limit of approximately 55 for outdoor living areas during the day to prevent annoyance and health issues.
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9The Montreal Protocol is an international treaty designed to protect:
A.Wetlands
B.Endangered species
C.The Ozone Layer
D.The Amazon Rainforest
Correct Answer: The Ozone Layer
Explanation:The Montreal Protocol (1987) is a global agreement to protect the stratospheric ozone layer by phasing out the production and consumption of ozone-depleting substances (ODS) like CFCs.
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10Which chemical family is primarily responsible for the depletion of the stratospheric ozone layer?
A.Hydrocarbons
B.Chlorofluorocarbons (CFCs)
C.Sulfur Oxides ()
D.Carbonates
Correct Answer: Chlorofluorocarbons (CFCs)
Explanation:CFCs release chlorine atoms when exposed to UV radiation in the stratosphere. A single chlorine atom can destroy thousands of ozone () molecules.
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11Which of the following is a greenhouse gas with a Global Warming Potential (GWP) significantly higher than ?
A.Nitrogen ()
B.Oxygen ()
C.Argon ()
D.Methane ()
Correct Answer: Methane ()
Explanation:Methane is a potent greenhouse gas. Over a 100-year period, it has a Global Warming Potential roughly 28–34 times that of Carbon Dioxide ().
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12Acid rain typically has a pH value of:
A.Equal to 7.0
B.Greater than 7.0
C.Less than 5.6
D.Exactly 6.5
Correct Answer: Less than 5.6
Explanation:Normal rain is slightly acidic (pH ~5.6) due to carbonic acid. Acid rain has a pH lower than 5.6 due to the presence of sulfuric and nitric acids formed from and .
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13The corrosion of the Taj Mahal due to pollution is often referred to as:
A.Marble Cancer
B.Stone Leprosy
C.Calcium Decay
D.Both A and B
Correct Answer: Both A and B
Explanation:Acid rain reacts with the calcium carbonate () in the marble, turning it into gypsum, causing the stone to flake and yellow. This is known as Marble Cancer or Stone Leprosy.
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14Which gas was responsible for the Bhopal Gas Tragedy in 1984?
A.Phosgene
B.Methyl Isocyanate (MIC)
C.Carbon Monoxide
D.Mustard Gas
Correct Answer: Methyl Isocyanate (MIC)
Explanation:The Bhopal Gas Tragedy occurred due to the leak of Methyl Isocyanate (MIC) gas from the Union Carbide India Limited pesticide plant.
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15Itai-Itai disease is caused by chronic poisoning from which heavy metal?
A.Lead ()
B.Mercury ()
C.Cadmium ()
D.Chromium ()
Correct Answer: Cadmium ()
Explanation:Itai-Itai disease ('it hurts-it hurts') occurred in Japan due to cadmium poisoning, leading to severe bone pain and softening of the bones (osteomalacia).
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16Which of the following is the correct order of the 3Rs in waste management?
A.Recycle, Reuse, Reduce
B.Reduce, Reuse, Recycle
C.Reuse, Reduce, Recycle
D.Recover, Reduce, Reuse
Correct Answer: Reduce, Reuse, Recycle
Explanation:The hierarchy of waste management prioritizes 'Reduce' (creating less waste) first, followed by 'Reuse' (using items again), and finally 'Recycle' (processing waste into new materials).
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17What is leachate in the context of solid waste management?
A.The ash produced after incineration
B.The liquid that drains or 'leaches' from a landfill
C.The gas produced by decomposing waste
D.A type of plastic that cannot be recycled
Correct Answer: The liquid that drains or 'leaches' from a landfill
Explanation:Leachate is the liquid that passes through a landfill, extracting dissolved and suspended matter from the waste material, which can contaminate groundwater if not managed.
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18Which of the following is a method of converting organic waste into nutrient-rich manure using earthworms?
A.Incineration
B.Pyrolysis
C.Vermicomposting
D.Sanitary Landfilling
Correct Answer: Vermicomposting
Explanation:Vermicomposting utilizes earthworms (like Eisenia fetida) to break down organic waste into high-quality compost.
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19Which device is used in automobiles to reduce the emission of toxic gases like and ?
A.Electrostatic Precipitator
B.Catalytic Converter
C.Cyclone Separator
D.Bag Filter
Correct Answer: Catalytic Converter
Explanation:A catalytic converter uses catalysts (Platinum, Palladium, Rhodium) to convert toxic gases (, , hydrocarbons) into less harmful substances (, , water vapor).
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20An Electrostatic Precipitator (ESP) is primarily used to control which type of pollution?
A.Thermal pollution
B.Noise pollution
C.Particulate matter in air pollution
D.Radioactive waste
Correct Answer: Particulate matter in air pollution
Explanation:ESPs are filtration devices that remove fine particles (dust and smoke) from a flowing gas using the force of an induced electrostatic charge.
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21Which radioactive isotope is a major concern in nuclear reactor accidents due to its accumulation in the thyroid gland?
A.Uranium-235 ()
B.Iodine-131 ()
C.Strontium-90 ()
D.Carbon-14 ()
Correct Answer: Iodine-131 ()
Explanation:Radioactive Iodine-131 is readily absorbed by the thyroid gland. In the event of nuclear accidents (like Chernobyl), potassium iodide pills are distributed to block this uptake.
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22Biomagnification refers to:
A.The increase in population of a species
B.The breakdown of biodegradable waste
C.The increase in concentration of a toxicant at successive trophic levels
D.The expansion of desert areas
Correct Answer: The increase in concentration of a toxicant at successive trophic levels
Explanation:Biomagnification occurs when toxic substances (like DDT or Mercury) accumulated in lower organisms are transferred to predators, increasing in concentration as they move up the food chain.
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23Which metal is commonly added to fireworks to produce a green color?
A.Strontium
B.Sodium
C.Barium
D.Copper
Correct Answer: Barium
Explanation:Barium salts (like Barium Nitrate) are responsible for the green color in fireworks. Strontium creates red, Sodium creates yellow, and Copper creates blue.
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24What is the primary environmental concern regarding microplastics?
A.They block sunlight in the upper atmosphere
B.They are ingested by marine life and enter the food web
C.They cause acid rain
D.They deplete the ozone layer
Correct Answer: They are ingested by marine life and enter the food web
Explanation:Microplastics (<5mm) are mistaken for food by marine organisms. They accumulate in the gut and tissues, transferring toxins up the food chain to humans.
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25The Chernobyl disaster (1986) was a catastrophic event related to:
A.Oil Spill
B.Nuclear Meltdown
C.Chemical Gas Leak
D.Dam Failure
Correct Answer: Nuclear Meltdown
Explanation:The Chernobyl disaster was a nuclear accident that occurred at the Chernobyl Nuclear Power Plant in Ukraine, releasing large quantities of radioactive particles into the atmosphere.
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26Which of the following is an example of a non-point source of pollution?
A.A discharge pipe from a factory
B.Agricultural runoff from farm fields
C.A sewage treatment plant outlet
D.An oil spill from a tanker
Correct Answer: Agricultural runoff from farm fields
Explanation:Non-point source pollution comes from diffuse sources that are hard to pinpoint to a single location, such as runoff from agriculture or urban stormwater.
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27Thermal pollution in water bodies is primarily caused by:
A.Sewage discharge
B.Agricultural runoff
C.Discharge of hot water from power plants
D.Oil spills
Correct Answer: Discharge of hot water from power plants
Explanation:Power plants and industrial factories often use water for cooling and discharge the heated water back into natural water bodies, reducing dissolved oxygen and harming aquatic life.
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28The Kyoto Protocol operationalizes the United Nations Framework Convention on Climate Change by committing industrialized countries to limit and reduce:
A.Ozone Depleting Substances
B.Greenhouse Gas (GHG) emissions
C.Plastic waste
D.Nuclear proliferation
Correct Answer: Greenhouse Gas (GHG) emissions
Explanation:The Kyoto Protocol (adopted 1997) sets binding emission reduction targets for greenhouse gases for developed countries.
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29Which measurement unit is used to express the thickness of the ozone layer?
A.Parts per million (ppm)
B.Decibels (dB)
C.Dobson Units (DU)
D.Sieverts (Sv)
Correct Answer: Dobson Units (DU)
Explanation:The thickness of the ozone layer is measured in Dobson Units. One DU corresponds to a layer of ozone that would be thick at standard temperature and pressure.
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30Radon () is a naturally occurring radioactive gas that is a leading cause of:
A.Skin cancer
B.Lung cancer
C.Leukemia
D.Bone cancer
Correct Answer: Lung cancer
Explanation:Radon is an inert, radioactive gas released from the ground that can accumulate in homes. Inhalation of radon decay products is the second leading cause of lung cancer after smoking.
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31The 'Great Smog of London' in 1952 was a severe air pollution event caused principally by:
A.Vehicle exhaust ()
B.Burning of coal ( and particulates)
C.Nuclear fallout
D.Forest fires
Correct Answer: Burning of coal ( and particulates)
Explanation:The Great Smog was caused by a combination of an anticyclone (temperature inversion), windless conditions, and airborne pollutants from the extensive use of coal.
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32Which of the following is considered 'Electronic Waste' (E-waste)?
A.Used medical syringes
B.Discarded computers and mobile phones
C.Industrial sludge
D.Food scraps
Correct Answer: Discarded computers and mobile phones
Explanation:E-waste consists of discarded electrical or electronic devices. It often contains hazardous materials like lead, cadmium, and beryllium.
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33What is the primary effect of Ocean Acidification?
A.Increase in sea surface temperature
B.Reduction in calcification rates of shell-forming organisms
C.Increase in ocean currents
D.Rise in sea levels
Correct Answer: Reduction in calcification rates of shell-forming organisms
Explanation:Ocean acidification occurs when the ocean absorbs excess . This lowers pH and reduces carbonate ion availability, making it difficult for corals and shellfish to build their calcium carbonate shells.
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34The term 'albedo' refers to:
A.The warming potential of a gas
B.The reflectivity of a surface
C.The acidity of rain
D.The toxicity of a pesticide
Correct Answer: The reflectivity of a surface
Explanation:Albedo is the fraction of sunlight that is reflected by a surface. Ice has high albedo (reflects heat); dark ocean water has low albedo (absorbs heat). Loss of ice leads to more heat absorption (positive feedback).
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35Which of the following is a control measure for soil pollution?
A.Bioremediation
B.Incineration
C.Desalination
D.Chlorination
Correct Answer: Bioremediation
Explanation:Bioremediation involves using microorganisms (bacteria/fungi) or plants (phytoremediation) to detoxify or remove pollutants from the soil.
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36Particulate Matter 2.5 () refers to particles with a diameter of:
A.Less than 2.5 millimeters
B.Less than 2.5 micrometers
C.More than 2.5 micrometers
D.Exactly 2.5 nanometers
Correct Answer: Less than 2.5 micrometers
Explanation: are fine inhalable particles with diameters that are generally 2.5 micrometers and smaller. They can penetrate deep into the lungs and enter the bloodstream.
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37The Love Canal tragedy in the 1970s is a famous case study regarding:
A.Nuclear waste
B.Improper disposal of hazardous chemical waste
C.Oil spills
D.Deforestation
Correct Answer: Improper disposal of hazardous chemical waste
Explanation:Love Canal (New York) was a neighborhood built on top of a toxic waste dump. Chemicals leached into basements and yards, causing birth defects and leading to the creation of the Superfund program.
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38Which of the following gases are the primary precursors to Photochemical Smog?
A. and
B. and Volatile Organic Compounds (VOCs)
C. and
D. and
Correct Answer: and Volatile Organic Compounds (VOCs)
Explanation:Photochemical smog is formed when nitrogen oxides () and VOCs react in the presence of sunlight, creating a brown haze and ground-level ozone.
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39What is the main function of a Scrubber in industrial pollution control?
A.To filter solid plastic waste
B.To remove particulate matter or gases from industrial exhaust streams
C.To measure noise levels
D.To cool down thermal effluents
Correct Answer: To remove particulate matter or gases from industrial exhaust streams
Explanation:Scrubbers are air pollution control devices that use liquid (wet scrubbers) or dry reagents to wash acid gases (like ) or particulates out of a gas stream.
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40Which of the following describes the Greenhouse Effect?
A.Trapping of heat by the Earth's atmosphere
B.Cooling of the Earth due to aerosols
C.The growth of plants in a controlled environment
D.The reflection of sunlight by ice caps
Correct Answer: Trapping of heat by the Earth's atmosphere
Explanation:The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.
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41Pyrolysis is a waste treatment process that involves:
A.Burning waste in open air
B.Decomposition of organic material at high temperatures in the absence of oxygen
C.Burying waste in landfills
D.Dissolving waste in acid
Correct Answer: Decomposition of organic material at high temperatures in the absence of oxygen
Explanation:Pyrolysis is the thermal decomposition of materials at elevated temperatures in an inert atmosphere (without oxygen), producing biochar, oil, and syngas.
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42Perchlorate (), often found in water near military sites and fireworks manufacturing, affects human health by:
A.Damaging the liver
B.Interfering with iodide uptake in the thyroid
C.Causing skin lesions
D.Reducing bone density
Correct Answer: Interfering with iodide uptake in the thyroid
Explanation:Perchlorate inhibits the thyroid gland's ability to absorb iodine, which is necessary for producing thyroid hormones that regulate metabolism and growth.
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43Which heavy metal, previously used in gasoline and paint, causes neurological damage particularly in children?
A.Zinc
B.Lead ()
C.Iron
D.Magnesium
Correct Answer: Lead ()
Explanation:Lead is a neurotoxin. Exposure in children can lead to behavioral problems, lower IQ, and learning disabilities. It was phased out of gasoline (leaded petrol) to reduce air pollution.
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44The Exxon Valdez incident is a well-known case study of:
A.Marine Oil Spill
B.Nuclear leak
C.Dam collapse
D.Smog formation
Correct Answer: Marine Oil Spill
Explanation:In 1989, the Exxon Valdez oil tanker struck a reef in Prince William Sound, Alaska, spilling millions of gallons of crude oil and devastating marine wildlife.
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45What is the approximate concentration of in the atmosphere currently (as of recent years)?
A.0.04% (approx 420 ppm)
B.4.0% (approx 40,000 ppm)
C.21%
D.0.9%
Correct Answer: 0.04% (approx 420 ppm)
Explanation:Carbon dioxide makes up about 0.04% of the atmosphere. Since the industrial revolution, it has risen from ~280 ppm to over 420 ppm.
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46Lichens are good bio-indicators for which type of pollution?
A.Water pollution (Nitrates)
B.Soil pollution (Pesticides)
C.Air pollution (Sulfur Dioxide)
D.Radioactive pollution
Correct Answer: Air pollution (Sulfur Dioxide)
Explanation:Lichens are very sensitive to sulfur dioxide () in the air. They disappear from areas with high air pollution, making them excellent biological indicators.
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47Which of the following is a physical effect of Noise Pollution on humans?
A.Hypertension (High Blood Pressure)
B.Temporary or Permanent Threshold Shift (Hearing loss)
C.Sleep disturbance
D.All of the above
Correct Answer: All of the above
Explanation:Noise pollution triggers the body's stress response, leading to cardiovascular issues (hypertension), psychological issues (sleep, anxiety), and direct physical damage to the ear (hearing loss).
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48What distinguishes Green Crackers from traditional fireworks?
A.They are green in color
B.They release 30% less particulate matter and avoid using Barium nitrate
C.They make no sound
D.They are made of leaves
Correct Answer: They release 30% less particulate matter and avoid using Barium nitrate
Explanation:Green crackers are developed (e.g., by CSIR-NEERI in India) to have a smaller shell, eliminate ash usage, and reduce emissions of Particulate Matter and harmful gases like and .
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49Endocrine Disrupting Chemicals (EDCs) like BPA (Bisphenol A) are predominantly found in:
A.Plastics and food storage containers
B.Car exhaust
C.Concrete
D.Fireworks
Correct Answer: Plastics and food storage containers
Explanation:BPA is used to make polycarbonate plastics and epoxy resins. It can leach into food/beverages and mimic hormones (like estrogen), disrupting the endocrine system.
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50What is the 'Clean Water Act' primarily designed to do?
A.Regulate discharges of pollutants into the waters and regulate quality standards for surface waters
B.Distribute bottled water
C.Clean the oceans of plastic
D.Build dams
Correct Answer: Regulate discharges of pollutants into the waters and regulate quality standards for surface waters
Explanation:The Clean Water Act (specifically the US 1972 act, but the concept applies globally) establishes the basic structure for regulating pollutant discharges into the waters of the United States and regulating quality standards for surface waters.