1Which of the following is considered a secondary air pollutant?
A.Ground-level Ozone
B.Carbon Monoxide
C.Sulfur Dioxide
D.Particulate Matter
Correct Answer: Ground-level Ozone
Explanation:
Secondary pollutants are not emitted directly but form when primary pollutants react in the atmosphere. Ground-level ozone forms from chemical reactions between NOx and VOCs.
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2What is the primary cause of the 'Greenhouse Effect'?
A.Accumulation of heat-trapping gases like CO2
B.Increase in particulate matter
C.Acid rain
D.Depletion of the ozone layer
Correct Answer: Accumulation of heat-trapping gases like CO2
Explanation:
The greenhouse effect is caused by the accumulation of greenhouse gases (like Carbon Dioxide and Methane) which trap heat in the Earth's atmosphere.
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3Minamata disease was caused by the contamination of water with which heavy metal?
A.Cadmium
B.Arsenic
C.Lead
D.Mercury
Correct Answer: Mercury
Explanation:
Minamata disease is a neurological syndrome caused by severe mercury poisoning, originating from industrial wastewater released into Minamata Bay in Japan.
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4Which gas was released during the Bhopal Gas Tragedy in 1984?
A.Chlorofluorocarbon
B.Methyl Isocyanate (MIC)
C.Carbon Monoxide
D.Sulfur Dioxide
Correct Answer: Methyl Isocyanate (MIC)
Explanation:
The Bhopal Gas Tragedy involved the accidental release of Methyl Isocyanate (MIC) gas from a pesticide plant, causing thousands of deaths.
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5What does BOD stand for in the context of water pollution?
A.Basic Oxygen Depletion
B.Bacterial Oxygen Demand
C.Biological Ozone Depletion
D.Biological Oxygen Demand
Correct Answer: Biological Oxygen Demand
Explanation:
BOD stands for Biological Oxygen Demand, which measures the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in water.
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6Which layer of the atmosphere contains the protective ozone layer?
A.Thermosphere
B.Mesosphere
C.Troposphere
D.Stratosphere
Correct Answer: Stratosphere
Explanation:
The ozone layer is located in the Stratosphere and absorbs most of the Sun's ultraviolet (UV) radiation.
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7What is the main chemical responsible for the depletion of the ozone layer?
A.Methane
B.Chlorofluorocarbons (CFCs)
C.Sulfur Dioxide
D.Carbon Dioxide
Correct Answer: Chlorofluorocarbons (CFCs)
Explanation:
CFCs release chlorine atoms when exposed to UV radiation in the stratosphere, which then break down ozone molecules.
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8Which phenomenon is primarily responsible for the yellowing of the Taj Mahal?
A.Ozone Depletion
B.Eutrophication
C.Global Warming
D.Acid Rain
Correct Answer: Acid Rain
Explanation:
Acid rain, containing sulfuric and nitric acids formed from SO2 and NOx emissions (largely from the nearby Mathura refinery), reacts with the marble (calcium carbonate) of the Taj Mahal, causing it to yellow.
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9Which of the following describes 'Eutrophication'?
A.Excessive nutrient enrichment in water bodies
B.Accumulation of toxic metals
C.Soil erosion
D.Depletion of ozone
Correct Answer: Excessive nutrient enrichment in water bodies
Explanation:
Eutrophication is the process where a water body becomes overly enriched with minerals and nutrients (like nitrates and phosphates), leading to excessive algae growth and oxygen depletion.
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10The presence of E. coli in water indicates contamination by:
A.Fecal matter
B.Oil spills
C.Industrial effluents
D.Heavy metals
Correct Answer: Fecal matter
Explanation:
Escherichia coli (E. coli) is a coliform bacterium found in the intestines of warm-blooded animals, and its presence in water indicates fecal contamination.
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11Which unit is used to measure the intensity of noise?
A.Hertz
B.Dobson
C.ppm
D.Decibel (dB)
Correct Answer: Decibel (dB)
Explanation:
Sound intensity or loudness is measured in Decibels (dB).
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12Exposure to noise levels above which threshold is generally considered hazardous to human health?
A.60 dB
B.40 dB
C.120 dB
D.80 dB
Correct Answer: 80 dB
Explanation:
Prolonged exposure to noise levels above 80-85 dB can cause hearing damage and other stress-related health issues.
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13What is 'Leachate' in the context of waste management?
A.Recycled plastic pellets
B.Liquid that drains from a landfill
C.The gas produced by composting
D.Ash from incineration
Correct Answer: Liquid that drains from a landfill
Explanation:
Leachate is the liquid that passes through a landfill, extracting dissolved and suspended matter, often becoming a toxic pollutant for groundwater.
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14Itai-Itai disease is caused by poisoning from which element?
A.Lead
B.Chromium
C.Mercury
D.Cadmium
Correct Answer: Cadmium
Explanation:
Itai-Itai disease was caused by cadmium poisoning in the Jinzū River basin in Japan, resulting in severe bone pain and softening of bones.
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15Which international protocol is aimed at reducing greenhouse gas emissions?
A.Kyoto Protocol
B.Ramsar Convention
C.Montreal Protocol
D.Basel Convention
Correct Answer: Kyoto Protocol
Explanation:
The Kyoto Protocol is an international treaty that commits state parties to reduce greenhouse gas emissions.
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16The Montreal Protocol is related to:
A.Protection of the Ozone Layer
B.Climate Change
C.Biodiversity Conservation
D.Control of Transboundary Movement of Hazardous Wastes
Correct Answer: Protection of the Ozone Layer
Explanation:
The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of substances that deplete it.
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17What is the primary component of photochemical smog?
A.Carbon monoxide
B.Sulfur dioxide
C.Methane
D.Ground-level Ozone
Correct Answer: Ground-level Ozone
Explanation:
Photochemical smog is a mixture of pollutants that form when nitrogen oxides and volatile organic compounds react to sunlight, creating ground-level ozone as a primary component.
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18Which of the following is a method of Solid Waste Management where waste is burned at high temperatures?
A.Vermiculture
B.Incineration
C.Composting
D.Landfilling
Correct Answer: Incineration
Explanation:
Incineration is a waste treatment process that involves the combustion of organic substances contained in waste materials.
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19Bio-magnification refers to:
A.Expansion of forest cover
B.Increase in concentration of toxins at successive trophic levels
C.Increase in population of a species
D.Growth of algae in water
Correct Answer: Increase in concentration of toxins at successive trophic levels
Explanation:
Biomagnification is the increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successively higher levels in a food chain.
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20Which radioactive gas, naturally occurring in soil, is a leading cause of lung cancer in non-smokers?
A.Xenon
B.Argon
C.Radon
D.Krypton
Correct Answer: Radon
Explanation:
Radon is a radioactive gas released from the normal decay of uranium in rocks and soil. It can accumulate in homes and cause lung cancer.
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21The '3Rs' principle in waste management stands for:
A.Read, Register, Recall
B.Reduce, Reuse, Recycle
C.Random, Rare, Reactive
D.Refuse, Recover, Replant
Correct Answer: Reduce, Reuse, Recycle
Explanation:
The 3Rs stand for Reduce (create less waste), Reuse (use items again), and Recycle (process waste into new products).
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22Vermicomposting involves the use of:
A.Earthworms
B.Fungi
C.Algae
D.Bacteria
Correct Answer: Earthworms
Explanation:
Vermicomposting is the process of using earthworms to convert organic waste into a nutrient-rich material capable of supplying necessary nutrients to help plants grow.
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23Blue Baby Syndrome (Methemoglobinemia) is caused by the presence of excess _____ in drinking water.
A.Nitrates
B.Lead
C.Fluoride
D.Arsenic
Correct Answer: Nitrates
Explanation:
Excess nitrates in water are converted to nitrites in the body, which bind to hemoglobin and reduce its oxygen-carrying capacity, leading to Blue Baby Syndrome.
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24Which specific pollutant causes the 'blackening' of lead-based paints?
A.Hydrogen Sulfide
B.Sulfur Dioxide
C.Carbon Dioxide
D.Nitrogen Dioxide
Correct Answer: Hydrogen Sulfide
Explanation:
Hydrogen Sulfide (H2S) reacts with lead in paints to form lead sulfide, which is black in color.
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25Fly ash is an environmental pollutant produced by:
A.Nuclear power plants
B.Hydroelectric power plants
C.Thermal power plants
D.Tidal power plants
Correct Answer: Thermal power plants
Explanation:
Fly ash is a coal combustion product that is composed of the particulates (fine particles of burned fuel) that are driven out of coal-fired boilers in thermal power plants.
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26What is the primary health hazard associated with PM2.5?
A.Digestive issues
B.Hearing loss
C.Penetration deep into the lungs and bloodstream
D.Skin irritation
Correct Answer: Penetration deep into the lungs and bloodstream
Explanation:
PM2.5 refers to particulate matter 2.5 micrometers or less in diameter, which is small enough to be inhaled deep into the lungs and enter the bloodstream.
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27Which metal is commonly used in fireworks to produce green color but is harmful to the respiratory system?
A.Barium
B.Sodium
C.Copper
D.Strontium
Correct Answer: Barium
Explanation:
Barium salts are used to create green colors in fireworks. Barium is toxic and inhaling its fumes can irritate the respiratory tract.
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28Bioremediation is:
A.Using microbes to clean up contaminated soil and groundwater
B.Filtering water using sand
C.Planting trees to reduce noise
D.Using chemicals to kill pests
Correct Answer: Using microbes to clean up contaminated soil and groundwater
Explanation:
Bioremediation is a process used to treat contaminated media, including water, soil, and subsurface material, by altering environmental conditions to stimulate growth of microorganisms and degrade the target pollutants.
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29Which of the following is an 'Emerging Pollutant' found in water bodies?
A.Pharmaceuticals
B.Leaves
C.Sand
D.Iron
Correct Answer: Pharmaceuticals
Explanation:
Pharmaceuticals and personal care products (PPCPs) are considered emerging pollutants as they are increasingly detected in water bodies and their long-term effects are being studied.
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30The measurement 'Dobson Unit' is associated with:
A.Water turbidity
B.Noise levels
C.Soil acidity
D.Ozone layer thickness
Correct Answer: Ozone layer thickness
Explanation:
The Dobson Unit (DU) is a unit of measurement for the total amount of ozone in the atmosphere above a point on the Earth's surface.
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31Carbon Monoxide (CO) is dangerous because it:
A.Depletes the ozone layer
B.Combines with hemoglobin reducing oxygen transport
C.Causes acid rain
D.Is a greenhouse gas
Correct Answer: Combines with hemoglobin reducing oxygen transport
Explanation:
CO binds with hemoglobin to form carboxyhemoglobin, which is far more stable than oxyhemoglobin, preventing blood from carrying oxygen to the body's tissues.
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32Which of the following is a non-point source of pollution?
A.A sewage treatment plant outlet
B.An oil rig spill
C.A factory discharge pipe
D.Agricultural runoff
Correct Answer: Agricultural runoff
Explanation:
Non-point source pollution comes from diffuse sources. Agricultural runoff collects pollutants from a wide area and washes them into water bodies, unlike a single pipe (point source).
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33Lichens are good bio-indicators for which type of pollution?
A.Soil pollution
B.Radiation pollution
C.Water pollution
D.Air pollution (SO2)
Correct Answer: Air pollution (SO2)
Explanation:
Lichens are very sensitive to sulfur dioxide (SO2) in the air. Their absence or poor growth indicates high levels of air pollution.
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34What is the main source of thermal pollution in water bodies?
A.Oil spills
B.Agricultural runoff
C.Discharge of hot water from industries/power plants
D.Sewage discharge
Correct Answer: Discharge of hot water from industries/power plants
Explanation:
Thermal pollution is the degradation of water quality by any process that changes ambient water temperature, most commonly the use of water as a coolant by power plants.
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35The Great Pacific Garbage Patch is primarily made up of:
A.Radioactive waste
B.Microplastics and floating debris
C.Organic waste
D.Oil sludge
Correct Answer: Microplastics and floating debris
Explanation:
The Great Pacific Garbage Patch is a collection of marine debris, mostly consisting of plastics and microplastics, trapped by the North Pacific Gyre.
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36Arsenic contamination in groundwater is a major problem in which part of India?
A.Himachal Pradesh
B.Rajasthan
C.West Bengal
D.Kerala
Correct Answer: West Bengal
Explanation:
Arsenic contamination is a severe issue in the Ganges Delta, affecting West Bengal and neighboring Bangladesh.
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37Which component of e-waste is known to damage the central nervous system and kidneys?
A.Lead
B.Silicon
C.Gold
D.Iron
Correct Answer: Lead
Explanation:
Lead, found in soldering and CRTs of old electronics, is highly toxic and can cause damage to the central nervous system and kidneys.
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38The primary gases responsible for Acid Rain are:
A.SO2 and NOx
B.O3 and Pb
C.CO2 and CO
D.CH4 and CFCs
Correct Answer: SO2 and NOx
Explanation:
Sulfur Dioxide (SO2) and Nitrogen Oxides (NOx) react with water, oxygen, and other chemicals in the atmosphere to form sulfuric and nitric acids.
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39Which of the following is a control measure for particulate matter emissions from industries?
A.Chlorination
B.Sedimentation tank
C.Electrostatic Precipitator
D.Aeration
Correct Answer: Electrostatic Precipitator
Explanation:
Electrostatic Precipitators (ESP) are filtration devices that remove fine particles like dust and smoke from a flowing gas using the force of an induced electrostatic charge.
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40The pH value of acid rain is generally considered to be below:
A.5.6
B.8.2
C.7.0
D.10.0
Correct Answer: 5.6
Explanation:
Normal rain is slightly acidic (pH 5.6) due to CO2. Acid rain has a pH below 5.6.
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41Which radiation caused the Chernobyl disaster?
A.UV radiation
B.Ionizing radiation (Nuclear)
C.Infrared radiation
D.Microwave radiation
Correct Answer: Ionizing radiation (Nuclear)
Explanation:
The Chernobyl disaster was a nuclear accident that released large quantities of radioactive (ionizing) particles into the atmosphere.
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42A major impact of global warming on agriculture is:
A.Shifting crop growing seasons and reduced yields
B.Increased soil fertility everywhere
C.Reduced pest population
D.Increased crop predictability
Correct Answer: Shifting crop growing seasons and reduced yields
Explanation:
Global warming alters weather patterns, leading to heat stress, changing rainfall, and shifting growing seasons, which generally negatively impacts crop yields.
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43Perchlorate is an emerging pollutant often associated with:
A.Paper mills
B.Food waste
C.Plastic bags
D.Rocket fuel and fireworks
Correct Answer: Rocket fuel and fireworks
Explanation:
Perchlorates are used as oxidizers in rocket propellants and fireworks. They can contaminate water and disrupt thyroid function.
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44The 'Love Canal' tragedy was a case study related to:
A.Air pollution
B.Oil spill
C.Nuclear waste dumping
D.Chemical waste dumping
Correct Answer: Chemical waste dumping
Explanation:
Love Canal was a neighborhood in Niagara Falls, NY, built atop a toxic chemical waste dump, leading to severe health issues for residents.
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45Pyrolysis is a method of waste disposal that involves:
A.Burning waste with excess oxygen
B.Thermal decomposition of waste in the absence of oxygen
C.Burying waste in soil
D.Dissolving waste in acid
Correct Answer: Thermal decomposition of waste in the absence of oxygen
Explanation:
Pyrolysis is the chemical decomposition of organic materials by heating in the absence of oxygen, producing bio-oil, bio-char, and syngas.
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46Microplastics are defined as plastic particles smaller than:
A.1 meter
B.10 cm
C.5 mm
D.5 cm
Correct Answer: 5 mm
Explanation:
Microplastics are widely defined as plastic particles less than 5 millimeters in length.
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47What is the 'Green Muffler' scheme related to?
A.Soil erosion control
B.Air pollution control
C.Water conservation
D.Noise pollution control
Correct Answer: Noise pollution control
Explanation:
The Green Muffler scheme involves planting rows of trees and shrubs in noisy areas (like roadsides) to absorb and reduce noise pollution.
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48Which gas contributes most to the unpleasant smell of rotten eggs near waste dumps?
A.Carbon Dioxide
B.Oxygen
C.Nitrogen
D.Hydrogen Sulfide
Correct Answer: Hydrogen Sulfide
Explanation:
Hydrogen Sulfide (H2S) is a gas produced by the anaerobic breakdown of organic matter and smells like rotten eggs.
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49Endosulfan, which caused severe health issues in Kerala (Kasargod), is a:
A.Pesticide
B.Radioactive element
C.Heavy metal
D.Fertilizer
Correct Answer: Pesticide
Explanation:
Endosulfan is an organochlorine insecticide and acaricide that was banned due to its toxicity and bioaccumulation, famously affecting the Kasargod district.
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50Which of the following is a 'cleaner' fuel used to reduce vehicular pollution?
A.Coal
B.Diesel
C.CNG (Compressed Natural Gas)
D.Leaded Petrol
Correct Answer: CNG (Compressed Natural Gas)
Explanation:
CNG produces fewer exhaust emissions (like carbon monoxide and hydrocarbons) compared to traditional fuels like petrol and diesel.