Nature, sources & effects of major pollutants of air
- Which pollutant is primarily responsible for acid rain?
a) CO₂
b) SO₂
c) O₃
d) CFCs
Answer: b) SO₂
Explanation: SO₂ (sulfur dioxide) reacts with water vapor to form sulfuric acid, a major component of acid rain. - The “Brown Air” phenomenon in smog is caused by:
a) Ozone
b) Nitrogen dioxide (NO₂)
c) Carbon monoxide (CO)
d) Particulate matter
Answer: b) Nitrogen dioxide (NO₂)
Explanation: NO₂ gives smog a reddish-brown hue and forms from vehicular emissions. - Which pollutant depletes the ozone layer?
a) CO
b) CFCs
c) SO₂
d) NH₃
Answer: b) CFCs
Explanation: Chlorofluorocarbons (CFCs) release chlorine atoms that break down ozone molecules. - Particulate Matter (PM2.5) affects human health by:
a) Causing skin cancer
b) Reducing lung function
c) Increasing blood pressure
d) Damaging the nervous system
Answer: b) Reducing lung function
Explanation: PM2.5 penetrates deep into lungs, causing asthma, bronchitis, and reduced lung capacity. - The primary source of carbon monoxide (CO) is:
a) Volcanic eruptions
b) Incomplete combustion of fossil fuels
c) Industrial solvents
d) Agricultural waste burning
Answer: b) Incomplete combustion of fossil fuels
Explanation: Vehicles and industrial processes release CO when carbon fuels burn incompletely. - Photochemical smog requires all EXCEPT:
a) Sunlight
b) NOₓ and VOCs
c) Low temperatures
d) Stable air
Answer: c) Low temperatures
Explanation: Photochemical smog forms in warm, sunny conditions with stagnant air. - Which pollutant causes “Blue Baby Syndrome”?
a) Nitrates
b) Lead
c) Mercury
d) Fluorides
Answer: a) Nitrates
Explanation: Nitrates from fertilizers contaminate water, reducing oxygen-carrying hemoglobin in infants. - Ozone (O₃) in the troposphere is:
a) A natural shield against UV rays
b) A secondary pollutant
c) Emitted by industries
d) Harmless to humans
Answer: b) A secondary pollutant
Explanation: Ground-level ozone forms when NOₓ and VOCs react in sunlight, harming respiratory health. - The Bhopal Gas Tragedy (1984) involved leakage of:
a) Methyl isocyanate
b) Sulfur dioxide
c) Ammonia
d) Benzene
Answer: a) Methyl isocyanate
Explanation: A pesticide plant leaked methyl isocyanate, killing thousands and causing long-term health issues. - Lead pollution primarily affects:
a) Kidney function
b) Nervous system
c) Digestive system
d) Reproductive system
Answer: b) Nervous system
Explanation: Lead accumulates in bones and tissues, causing neurotoxicity (especially in children). - Which is a natural source of air pollution?
a) Thermal power plants
b) Volcanic eruptions
c) Automobiles
d) Pesticides
Answer: b) Volcanic eruptions - The “Greenhouse Effect” is intensified by:
a) O₃ depletion
b) CO₂ emissions
c) SO₂ emissions
d) CFCs
Answer: b) CO₂ emissions - Minamata disease is linked to:
a) Mercury poisoning
b) Cadmium pollution
c) Lead toxicity
d) Arsenic contamination
Answer: a) Mercury poisoning - Which pollutant causes chlorosis in plants?
a) CO
b) SO₂
c) NO₂
d) O₃
Answer: b) SO₂ - Respirable Suspended Particulate Matter (RSPM) size is:
a) <10 µm
b) <100 µm
c) <2.5 µm
d) <1 µm
Answer: a) <10 µm - Eutrophication is caused by:
a) Heavy metals
b) Nitrogen/phosphorus runoff
c) Acid rain
d) Ozone
Answer: b) Nitrogen/phosphorus runoff - The Montreal Protocol (1987) aims to phase out:
a) Greenhouse gases
b) CFCs
c) Particulate matter
d) SO₂
Answer: b) CFCs - A major source of methane (CH₄) is:
a) Cement industries
b) Rice paddies
c) Nuclear reactors
d) Mining
Answer: b) Rice paddies - Which pollutant corrodes buildings and monuments?
a) CO
b) O₃
c) Acid rain (H₂SO₄)
d) CH₄
Answer: c) Acid rain (H₂SO₄) - The Air Quality Index (AQI) in India does NOT measure:
a) PM2.5
b) SO₂
c) Noise
d) O₃
Answer: c) Noise - Smog in Delhi is worsened by:
a) Stubble burning
b) Oceanic currents
c) Forest fires
d) Mining
Answer: a) Stubble burning - CO binds to hemoglobin to form:
a) Carbaminohemoglobin
b) Oxyhemoglobin
c) Carboxyhemoglobin
d) Methemoglobin
Answer: c) Carboxyhemoglobin - Black lung disease affects workers in:
a) Textile industries
b) Coal mines
c) Pesticide factories
d) Oil refineries
Answer: b) Coal mines - The “London Smog” (1952) was caused by:
a) Photochemical reactions
b) SO₂ and particulate matter
c) O₃ accumulation
d) Radioactive fallout
Answer: b) SO₂ and particulate matter - Which is NOT a VOC (Volatile Organic Compound)?
a) Benzene
b) Methane
c) Formaldehyde
d) Sulfate
Answer: d) Sulfate - Asbestos pollution causes:
a) Silicosis
b) Asbestosis
c) Emphysema
d) Tuberculosis
Answer: b) Asbestosis - Catalytic converters in vehicles reduce:
a) CO and NOₓ
b) SO₂
c) PM2.5
d) CFCs
Answer: a) CO and NOₓ - The “Jharia Coalfield” is infamous for:
a) Oil spills
b) Mine fires
c) Radioactive leaks
d) Acid mine drainage
Answer: b) Mine fires - PAN (Peroxyacetyl nitrate) is a component of:
a) Acid rain
b) Photochemical smog
c) Ozone hole
d) Eutrophication
Answer: b) Photochemical smog - The Chipko Movement aimed to prevent:
a) Air pollution
b) Deforestation
c) Water pollution
d) Soil erosion
Answer: b) Deforestation - Which pollutant is carcinogenic?
a) CO₂
b) Benzene
c) Methane
d) Nitrous oxide
Answer: b) Benzene - Fly ash from thermal plants contains:
a) Silica and aluminum
b) Mercury and lead
c) Phosphates
d) Nitrates
Answer: a) Silica and aluminum - The “Keeling Curve” tracks atmospheric:
a) O₃ levels
b) CO₂ levels
c) CFC concentrations
d) SO₂ emissions
Answer: b) CO₂ levels - Sick Building Syndrome is linked to:
a) Outdoor air pollution
b) Indoor VOCs and mold
c) Industrial emissions
d) Vehicle exhaust
Answer: b) Indoor VOCs and mold - NOₓ pollutants contribute to:
a) Eutrophication and acid rain
b) Ozone depletion
c) Greenhouse effect only
d) Metal corrosion
Answer: a) Eutrophication and acid rain - The “Great Smog of London” killed people due to:
a) Respiratory infections
b) Cardiovascular collapse
c) Neurotoxicity
d) Skin cancer
Answer: a) Respiratory infections - Which gas causes global warming?
a) O₂
b) N₂
c) CH₄
d) Argon
Answer: c) CH₄ (Methane) - The “Gangotri Glacier” retreat is linked to:
a) Acid rain
b) Global warming
c) Ozone depletion
d) Deforestation
Answer: b) Global warming - Silent Spring by Rachel Carson exposed hazards of:
a) Industrial smog
b) Nuclear radiation
c) Pesticides (DDT)
d) Heavy metals
Answer: c) Pesticides (DDT) - Scrubbers in industries control:
a) Particulate matter
b) Gaseous SO₂
c) CO emissions
d) Noise pollution
Answer: b) Gaseous SO₂ - The “Aral Sea disaster” resulted from:
a) Air pollution
b) Over-irrigation
c) Oil spills
d) Deforestation
Answer: b) Over-irrigation - Which is a secondary pollutant?
a) CO
b) SO₂
c) NO
d) PAN
Answer: d) PAN - “Black carbon” is a component of:
a) Ozone
b) Soot
c) Methane
d) CFCs
Answer: b) Soot - The Kyoto Protocol (1997) targeted:
a) Ozone depletion
b) Greenhouse gases
c) Acid rain
d) Plastic pollution
Answer: b) Greenhouse gases - Radon pollution causes:
a) Lung cancer
b) Melanoma
c) Leukemia
d) Liver cirrhosis
Answer: a) Lung cancer - The Taj Mahal is threatened by:
a) Acid rain (from Mathura refinery)
b) Flooding
c) Earthquakes
d) Sandstorms
Answer: a) Acid rain - Which pollutant causes “Itai-Itai” disease?
a) Lead
b) Cadmium
c) Mercury
d) Arsenic
Answer: b) Cadmium - The “Sunderbans” face threats from:
a) Air pollution
b) Sea-level rise
c) Ozone depletion
d) Desertification
Answer: b) Sea-level rise - Electrostatic precipitators control:
a) Gaseous pollutants
b) Particulate matter
c) Noise
d) Radioactivity
Answer: b) Particulate matter - The Paris Agreement (2015) aims to limit:
a) Global temperature rise to 2°C
b) Ozone depletion
c) Deforestation
d) Acid rain
Answer: a) Global temperature rise to 2°C
Nature, sources & effects of major pollutants of water
- Which pollutant causes “Blue Baby Syndrome”?
a) Fluoride
b) Arsenic
c) Nitrate
d) Lead
Answer: c) Nitrate
Explanation: High nitrate levels in drinking water reduce oxygen-carrying capacity of hemoglobin, causing methemoglobinemia (Blue Baby Syndrome). - Minamata disease is caused by:
a) Cadmium
b) Mercury
c) Chromium
d) Copper
Answer: b) Mercury
Explanation: Mercury-contaminated seafood from industrial discharge caused severe neurotoxicity in Minamata, Japan. - Eutrophication is primarily due to:
a) Heavy metals
b) Oil spills
c) Nitrates and phosphates
d) Radioactive waste
Answer: c) Nitrates and phosphates
Explanation: Excess nutrients from fertilizers/sewage cause algal blooms, depleting oxygen in water bodies. - The primary source of coliform bacteria in water is:
a) Industrial effluents
b) Human and animal feces
c) Agricultural runoff
d) Atmospheric deposition
Answer: b) Human and animal feces
Explanation: Coliforms indicate fecal contamination, leading to diseases like cholera. - “Itai-Itai” disease results from pollution by:
a) Lead
b) Arsenic
c) Cadmium
d) Mercury
Answer: c) Cadmium
Explanation: Cadmium from mining waste in Japan’s Jinzū River caused severe bone and kidney damage. - Biochemical Oxygen Demand (BOD) measures:
a) Heavy metal concentration
b) Oxygen consumed by decomposers
c) Nutrient levels
d) pH of water
Answer: b) Oxygen consumed by decomposers
Explanation: High BOD indicates organic pollution (e.g., sewage), reducing oxygen for aquatic life. - Arsenic contamination in groundwater is common in:
a) Rajasthan
b) West Bengal
c) Kerala
d) Gujarat
Answer: b) West Bengal
Explanation: Natural geological arsenic leaching affects groundwater in West Bengal, causing skin lesions and cancer. - Which pollutant causes “Black Foot Disease”?
a) Fluoride
b) Arsenic
c) Nitrate
d) Selenium
Answer: b) Arsenic
Explanation: Chronic arsenic exposure leads to peripheral vascular disease (Black Foot Disease). - Thermal pollution is mainly caused by:
a) Domestic sewage
b) Industrial coolants
c) Agricultural runoff
d) Oil refineries
Answer: b) Industrial coolants
Explanation: Power plants discharge hot water, reducing oxygen solubility and harming aquatic ecosystems. - The “Ganga Action Plan” primarily addresses:
a) Industrial waste
b) Sewage treatment
c) Agricultural chemicals
d) Religious offerings
Answer: b) Sewage treatment
Explanation: Launched in 1986 to reduce fecal coliform and organic load from urban sewage. - Oil spills harm marine life by:
a) Increasing dissolved oxygen
b) Blocking sunlight and suffocation
c) Promoting plankton growth
d) Reducing salinity
Answer: b) Blocking sunlight and suffocation
Explanation: Oil coats gills/feathers and blocks photosynthesis in aquatic plants. - Fluorosis is caused by excessive:
a) Fluoride in water
b) Lead in soil
c) Mercury in fish
d) Nitrates in vegetables
Answer: a) Fluoride in water
Explanation: Causes dental/skeletal deformities; endemic in Rajasthan, Telangana. - A major source of marine plastic pollution is:
a) Volcanic eruptions
b) Microbeads in cosmetics
c) Atmospheric deposition
d) Geothermal vents
Answer: b) Microbeads in cosmetics
Explanation: Microplastics from personal care products enter oceans via drainage. - Methyl isocyanate (MIC) contamination in water occurred during:
a) Chernobyl disaster
b) Bhopal Gas Tragedy
c) Minamata incident
d) Fukushima leak
Answer: b) Bhopal Gas Tragedy
Explanation: MIC leakage in 1984 contaminated groundwater in Bhopal. - Bioaccumulation refers to:
a) Nutrient enrichment in lakes
b) Pollutant concentration in organisms over time
c) Oxygen depletion in water
d) Sediment deposition
Answer: b) Pollutant concentration in organisms over time
Explanation: E.g., DDT in birds causing eggshell thinning. - Which pathogen causes Guinea worm disease?
a) Bacteria
b) Virus
c) Protozoan
d) Helminth
Answer: d) Helminth
Explanation: Dracunculus medinensis spreads via contaminated drinking water. - The “Dead Zone” in the Gulf of Mexico results from:
a) Oil spills
b) Mississippi River nutrient runoff
c) Industrial effluents
d) Thermal pollution
Answer: b) Mississippi River nutrient runoff
Explanation: Agricultural fertilizers cause hypoxic conditions, killing marine life. - Endosulfan pollution is linked to:
a) Kerala’s Kasaragod district
b) Yamuna River
c) Chilika Lake
d) Dal Lake
Answer: a) Kerala’s Kasaragod district
Explanation: Aerial spraying on cashew plantations caused neurotoxicity and birth defects. - Cadmium pollution affects the:
a) Nervous system
b) Renal system
c) Respiratory system
d) Digestive system
Answer: b) Renal system
Explanation: Causes kidney failure and osteomalacia (Itai-Itai disease). - Microcystins are toxins produced by:
a) Diatoms
b) Cyanobacteria
c) Dinoflagellates
d) Fungi
Answer: b) Cyanobacteria
Explanation: Algal blooms release hepatotoxins during eutrophication. - Arsenic contamination in groundwater originates from:
a) Industrial discharge
b) Natural geological deposits
c) Pesticides
d) Landfills
Answer: b) Natural geological deposits
Explanation: Arsenic leaches from Himalayan sediments into aquifers. - The “Cuyahoga River fire” of 1969 highlighted pollution by:
a) Plastic waste
b) Industrial chemicals
c) Sewage
d) Radioactive waste
Answer: b) Industrial chemicals
Explanation: Oil and chemical sludge ignited, spurring US water pollution laws. - Which metal causes “Anaemia”?
a) Lead
b) Mercury
c) Chromium
d) Nickel
Answer: a) Lead
Explanation: Lead inhibits heme synthesis, causing anemia. - The “Jharia Coalfield” is associated with:
a) Acid mine drainage
b) Oil spills
c) Thermal pollution
d) Eutrophication
Answer: a) Acid mine drainage
Explanation: Sulfide minerals leach sulfuric acid, contaminating water. - Giardiasis is caused by:
a) Bacteria
b) Protozoan
c) Virus
d) Fungus
Answer: b) Protozoan
Explanation: Giardia lamblia in contaminated water causes severe diarrhea. - The “Great Pacific Garbage Patch” is primarily:
a) Industrial waste
b) Plastic debris
c) Sewage sludge
d) Oil slicks
Answer: b) Plastic debris
Explanation: Ocean currents accumulate non-biodegradable plastics. - Which pollutant causes “Chloracne”?
a) Dioxins
b) Nitrates
c) Fluorides
d) Sulfates
Answer: a) Dioxins
Explanation: Dioxins from incineration cause severe skin lesions. - The primary purpose of percolation pits in rainwater harvesting is to:
a) Increase runoff
b) Recharge groundwater
c) Divert floods
d) Trap pollutants
Answer: b) Recharge groundwater
Explanation: Enhances aquifer replenishment and reduces contamination. - “Biomagnification” is most severe in:
a) Producers
b) Primary consumers
c) Tertiary consumers
d) Decomposers
Answer: c) Tertiary consumers
Explanation: Pollutants (e.g., DDT, mercury) amplify up the food chain. - The “Flint Water Crisis” involved contamination by:
a) Lead
b) Arsenic
c) Mercury
d) Cadmium
Answer: a) Lead
Explanation: Corroded pipes leached lead into Michigan’s drinking water. - “Red Tide” is caused by:
a) Diatoms
b) Dinoflagellates
c) Cyanobacteria
d) Green algae
Answer: b) Dinoflagellates
Explanation: Algal blooms release neurotoxins (e.g., brevetoxin), killing marine life. - Which industrial pollutant causes “Yusho Disease”?
a) PCBs (Polychlorinated biphenyls)
b) DDT
c) Endosulfan
d) BPA
Answer: a) PCBs
Explanation: PCB-contaminated cooking oil caused skin lesions in Japan (1968). - The “Narmada Bachao Andolan” opposed:
a) Industrial pollution
b) Large dams
c) Mining
d) Deforestation
Answer: b) Large dams
Explanation: Highlighted displacement and ecological damage from dams. - Which parameter indicates fecal pollution?
a) BOD
b) COD
c) Total coliform
d) Dissolved oxygen
Answer: c) Total coliform
Explanation: Coliform bacteria are indicators of sewage contamination. - “Selenium” toxicity in water causes:
a) Blindness
b) Teratogenic effects
c) Kidney stones
d) Thyroid dysfunction
Answer: b) Teratogenic effects
Explanation: Causes birth defects in aquatic birds (e.g., Kesterson Reservoir). - The primary source of “microplastics” in oceans is:
a) Synthetic clothing
b) Shipwrecks
c) Volcanic ash
d) Seaweed
Answer: a) Synthetic clothing
Explanation: Laundry releases microfibers into drainage systems. - “Cryptosporidium” contamination causes:
a) Malaria
b) Cholera
c) Severe diarrhea
d) Typhoid
Answer: c) Severe diarrhea
Explanation: Waterborne protozoan resistant to chlorine disinfection. - “Love Canal Tragedy” involved:
a) Nuclear waste
b) Chemical landfill leaching
c) Oil spill
d) Heavy metal discharge
Answer: b) Chemical landfill leaching
Explanation: Hooker Chemical’s waste contaminated soil/water in NY, USA. - Which pollutant inhibits nitrate uptake in plants?
a) Sodium
b) Chloride
c) Boron
d) Sulfate
Answer: b) Chloride
Explanation: High chloride from irrigation water affects crop yield. - “Coral bleaching” is exacerbated by:
a) Ocean acidification
b) Thermal stress
c) Sediment runoff
d) All of the above
Answer: d) All of the above
Explanation: Pollution and climate change drive coral symbiont loss. - “Sewage fungus” indicates:
a) High dissolved oxygen
b) Organic pollution
c) Heavy metal presence
d) Radioactivity
Answer: b) Organic pollution
Explanation: Filamentous bacteria (e.g., Sphaerotilus) thrive in nutrient-rich sewage. - “Erin Brockovich” case highlighted contamination by:
a) Lead
b) Arsenic
c) Chromium-VI
d) Mercury
Answer: c) Chromium-VI
Explanation: Hexavalent chromium in California’s groundwater caused cancers. - The “Safe Water Drinking Act” is enforced in:
a) India
b) USA
c) UK
d) Japan
Answer: b) USA
Explanation: US federal law regulating public drinking water quality. - “Bioremediation” of oil spills uses:
a) Pseudomonas bacteria
b) Lichens
c) Earthworms
d) Algae
Answer: a) Pseudomonas bacteria
Explanation: Hydrocarbon-degrading bacteria metabolize oil components. - “Hyporheic zone” contamination affects:
a) Groundwater-surface water exchange
b) Oceanic currents
c) Atmospheric deposition
d) Glacier melting
Answer: a) Groundwater-surface water exchange
Explanation: Critical for nutrient cycling and pollutant filtration in riverbeds. - “Fly ash ponds” pollute water with:
a) Heavy metals (e.g., arsenic, lead)
b) Nitrates
c) Pathogens
d) Pesticides
Answer: a) Heavy metals
Explanation: Coal combustion residues leach toxic metals into groundwater. - “MARPOL Annex V” regulates:
a) Oil spills
b) Plastic dumping at sea
c) Sewage discharge
d) Air pollution
Answer: b) Plastic dumping at sea
Explanation: International treaty prohibiting marine plastic disposal. - “Cyclops” is an intermediate host for:
a) Malaria
b) Guinea worm
c) Schistosomiasis
d) Filaria
Answer: b) Guinea worm
Explanation: Copepods (Cyclops) transmit Dracunculus medinensis. - “Ulhas River” pollution is caused by:
a) Tannery discharge
b) Thermal power plants
c) Shipbreaking yards
d) Textile dyes
Answer: d) Textile dyes
Explanation: Industrial effluents from Mumbai-Thane belt turn the river multicolored. - The “Zero Liquid Discharge” policy aims to:
a) Ban industrial water use
b) Recycle all wastewater
c) Promote rainwater harvesting
d) Reduce irrigation
Answer: b) Recycle all wastewater
Explanation: Minimizes freshwater extraction and pollutant release.
Nature, sources & effects of major pollutants of noise pollution
- The unit used to measure noise pollution is:
a) Hertz (Hz)
b) Decibel (dB)
c) Pascal (Pa)
d) Joule (J)
Answer: b) Decibel (dB)
Explanation: Decibel measures sound intensity. Human hearing ranges from 0 dB (threshold) to 120+ dB (painful). - Which is a natural source of noise pollution?
a) Thunderstorms
b) Industrial machinery
c) Aircraft
d) Construction work
Answer: a) Thunderstorms
Explanation: Thunder produces sound up to 120 dB, while others are anthropogenic sources. - Prolonged exposure to noise above ____ dB causes permanent hearing loss:
a) 50 dB
b) 80 dB
c) 120 dB
d) 140 dB
Answer: b) 80 dB
Explanation: WHO states chronic exposure to >85 dB causes NIHL (Noise-Induced Hearing Loss). - The primary source of noise pollution in urban areas is:
a) Factories
b) Road traffic
c) Fireworks
d) Agriculture
Answer: b) Road traffic
Explanation: Vehicles contribute 55-60% of urban noise (horns: 90-110 dB, engines: 70-90 dB). - “Leq” in noise measurement refers to:
a) Peak noise level
b) Equivalent continuous sound level
c) Background noise
d) Frequency weighting
Answer: b) Equivalent continuous sound level
Explanation: Leq averages noise exposure over time, crucial for environmental assessments. - Noise pollution disrupts wildlife by:
a) Altering migration routes
b) Reducing photosynthesis
c) Increasing soil fertility
d) Enhancing reproduction
Answer: a) Altering migration routes
Explanation: Birds/mammals change behavior due to noise interference (e.g., whales avoiding shipping lanes). - The permissible daytime noise level for residential areas in India is:
a) 45 dB
b) 55 dB
c) 65 dB
d) 75 dB
Answer: b) 55 dB
Explanation: CPCB mandates 55 dB (day) and 45 dB (night) for residential zones. - “Tinnitus” caused by noise pollution refers to:
a) Temporary hearing loss
b) Ringing in the ears
c) Ear infections
d) Balance disorders
Answer: b) Ringing in the ears
Explanation: Persistent ringing without external sound is a common NIHL symptom. - Which industry workers are most vulnerable to noise-induced hearing loss?
a) Software development
b) Textile manufacturing
c) Mining
d) Teaching
Answer: c) Mining
Explanation: Drilling/blasting in mines exposes workers to 100-130 dB. - Noise barriers along highways function by:
a) Absorbing sound waves
b) Reflecting sound upward
c) Reducing vehicle speed
d) Blocking wind
Answer: a) Absorbing sound waves
Explanation: Materials like concrete or vegetation absorb/dissipate sound energy. - The frequency range most harmful to humans is:
a) 0-20 Hz (Infrasound)
b) 20-20,000 Hz (Audible range)
c) 2,000-5,000 Hz
d) >20,000 Hz (Ultrasound)
Answer: c) 2,000-5,000 Hz
Explanation: Human ears are most sensitive to this range, making it more damaging at high intensity. - A “silence zone” in India includes areas within ____ meters of hospitals:
a) 50 m
b) 100 m
c) 500 m
d) 1 km
Answer: b) 100 m
Explanation: As per Noise Rules, 2000, a 100 m radius around hospitals, schools, and courts is a designated silence zone. - Which animal uses infrasound for communication?
a) Bat
b) Dolphin
c) Elephant
d) Dog
Answer: c) Elephant
Explanation: Elephants use infrasound (<20 Hz) to communicate over long distances. - Noise pollution increases the risk of:
a) Hypertension
b) Diabetes
c) Osteoporosis
d) Cataracts
Answer: a) Hypertension
Explanation: Long-term noise exposure increases stress hormone levels, leading to cardiovascular issues. - The “Doppler Effect” is associated with:
a) Change in sound frequency due to motion
b) Sound absorption by materials
c) Echo formation
d) Vibration damping
Answer: a) Change in sound frequency due to motion
Explanation: Frequency changes when the sound source or observer moves. - Aircraft noise is measured using:
a) PNdB (Perceived Noise Decibel)
b) dB(A)
c) dB(C)
d) Leq
Answer: a) PNdB
Explanation: PNdB includes human perception factors, suitable for aircraft noise assessment. - “Green mufflers” reduce noise pollution through:
a) Tree plantations
b) Electric vehicles
c) Soundproof walls
d) Noise-canceling devices
Answer: a) Tree plantations
Explanation: Dense plantations act as natural sound barriers. - The World Health Organization recommends nighttime noise levels below:
a) 30 dB
b) 40 dB
c) 50 dB
d) 60 dB
Answer: a) 30 dB
Explanation: Levels above 30 dB can disturb sleep and affect health. - Occupational noise exposure limits in India (8-hour workday) are:
a) 75 dB
b) 85 dB
c) 90 dB
d) 100 dB
Answer: c) 90 dB
Explanation: Limits defined under the Factories Act to ensure worker safety. - Ultrasound refers to sound waves above:
a) 2,000 Hz
b) 20,000 Hz
c) 200,000 Hz
d) 2 MHz
Answer: b) 20,000 Hz
Explanation: Ultrasound is beyond human hearing and used in diagnostics. - Noise pollution during Diwali in India peaks due to:
a) Firecrackers
b) Loudspeakers
c) Traffic congestion
d) Generator use
Answer: a) Firecrackers
Explanation: Firecrackers can produce noise up to 145 dB, far exceeding safe levels. - “Acoustic trauma” results from:
a) Chronic low-level noise
b) Single explosive sound
c) Infrasound exposure
d) Ultrasound exposure
Answer: b) Single explosive sound
Explanation: Instant exposure to very high decibel levels can rupture the eardrum. - Which law regulates noise pollution in India?
a) Air Act, 1981
b) Noise Rules, 2000
c) Environment Act, 1986
d) Water Act, 1974
Answer: b) Noise Rules, 2000
Explanation: Issued under the Environment Act to regulate noise levels. - Noise pollution affects marine life by:
a) Altering whale song frequency
b) Coral bleaching
c) Increasing plankton growth
d) Reducing salinity
Answer: a) Altering whale song frequency
Explanation: Noise from ships interferes with whale communication. - The “startle reflex” due to loud noise is controlled by the:
a) Cerebellum
b) Amygdala
c) Hippocampus
d) Thalamus
Answer: b) Amygdala
Explanation: Amygdala processes fear and sudden emotional responses. - Soundproofing materials work by:
a) Reflection
b) Absorption
c) Destructive interference
d) All of the above
Answer: d) All of the above
Explanation: Different materials reduce noise using multiple mechanisms. - “L10” in noise measurement denotes:
a) Background noise
b) Peak noise level
c) Noise exceeded 10% of the time
d) Average noise
Answer: c) Noise exceeded 10% of the time
Explanation: It reflects noise peaks over short durations. - Noise pollution causes sleep disturbances by reducing:
a) REM sleep
b) Deep sleep (NREM)
c) Total sleep duration
d) All of the above
Answer: d) All of the above
Explanation: It interrupts multiple phases of the sleep cycle. - Railway noise is primarily caused by:
a) Engine vibrations
b) Wheel-track friction
c) Whistles
d) Passenger chatter
Answer: b) Wheel-track friction
Explanation: The major source of noise in trains is the wheel-rail interface. - The “anti-noise” technique uses:
a) Active noise control b) Passive barriers
c) Green belts d) Zoning regulations
Answer: a) Active noise control
Explanation: ANC produces inverse sound waves to cancel noise. - Noise pollution near schools affects children by:
a) Improving concentration
b) Increasing memory retention
c) Reducing learning outcomes
d) Enhancing creativity
Answer: c) Reducing learning outcomes
Explanation: Chronic exposure impairs reading and attention. - “Audiometric testing” assesses:
a) Noise levels in environment
b) Hearing sensitivity
c) Sound absorption
d) Vibration frequency
Answer: b) Hearing sensitivity
Explanation: Audiometry checks hearing capacity across frequencies. - The main source of noise in construction sites is:
a) Worker conversations
b) Heavy machinery
c) Wind
d) Rainfall
Answer: b) Heavy machinery
Explanation: Equipment like jackhammers and bulldozers generate high decibel levels. - Noise pollution is measured using:
a) Hygrometer
b) Sound level meter
c) Anemometer
d) Seismograph
Answer: b) Sound level meter
Explanation: SLM measures noise intensity, often using A-weighting. - “Noise mapping” is used for:
a) Identifying quiet zones
b) Urban planning
c) Setting noise standards
d) All of the above
Answer: d) All of the above
Explanation: Noise maps support planning and regulatory decisions. - Wind turbines cause noise pollution through:
a) Aerodynamic noise
b) Mechanical vibrations
c) Infrasound
d) All of the above
Answer: d) All of the above
Explanation: Blade rotation and machinery inside turbines create multiple noise types. - The “annoyance” from noise depends on:
a) Loudness only
b) Frequency and predictability
c) Time of exposure
d) All of the above
Answer: d) All of the above
Explanation: These factors determine how disturbing noise is to individuals. - “Presbycusis” refers to:
a) Noise-induced hearing loss
b) Age-related hearing loss
c) Genetic deafness
d) Temporary threshold shift
Answer: b) Age-related hearing loss
Explanation: Gradual hearing decline common in the elderly. - In India, loudspeaker use is banned after ____ PM in public places:
a) 8 PM
b) 10 PM
c) 12 AM
d) 6 AM
Answer: b) 10 PM
Explanation: The ban lasts until 6 AM under Noise Rules, 2000. - Noise pollution during festivals violates the:
a) Right to Education
b) Right to Clean Water
c) Right to Life (Article 21)
d) Right to Equality
Answer: c) Right to Life (Article 21)
Explanation: The Supreme Court includes the right to a peaceful environment under Article 21. - “White noise” is used to:
a) Mask disruptive sounds
b) Cause hearing loss
c) Measure noise levels
d) Calibrate instruments
Answer: a) Mask disruptive sounds
Explanation: White noise smooths over abrupt sounds for better focus or sleep. - Noise pollution near airports causes:
a) Soil erosion
b) Sleep deprivation
c) Water contamination
d) Air pollution
Answer: b) Sleep deprivation
Explanation: Frequent aircraft noise disrupts sleep patterns of nearby residents. - The “CNG buses” in Delhi reduced:
a) Air pollution only
b) Noise pollution only
c) Both air and noise pollution
d) Water pollution
Answer: c) Both air and noise pollution
Explanation: CNG engines are cleaner and quieter than diesel. - “Acoustic zoning” separates:
a) Industrial and residential areas
b) Water bodies
c) Agricultural fields
d) Forest zones
Answer: a) Industrial and residential areas
Explanation: Zoning prevents noise exposure to sensitive land uses. - The “Noise Pollution Rules” are implemented by:
a) Central Pollution Control Board
b) State Governments
c) Ministry of Environment
d) All of the above
Answer: d) All of the above
Explanation: Multiple agencies coordinate to enforce noise limits. - “Hearing protection devices” include:
a) Earplugs and earmuffs
b) Helmets
c) Goggles
d) Respirators
Answer: a) Earplugs and earmuffs
Explanation: These reduce sound exposure by 15-30 dB. - Noise pollution increases ____ in humans:
a) Serotonin
b) Cortisol
c) Dopamine
d) Insulin
Answer: b) Cortisol
Explanation: Stress from noise leads to elevated cortisol, contributing to health risks. - The “Great tit” bird adapts to urban noise by:
a) Singing at lower frequencies
b) Singing at higher frequencies
c) Reducing song volume
d) Stopping vocalization
Answer: b) Singing at higher frequencies
Explanation: Birds shift pitch to avoid low-frequency urban noise. - “Lnight” noise indicator measures:
a) Daytime noise
b) Nighttime aircraft noise
c) Leisure noise
d) Industrial noise
Answer: b) Nighttime aircraft noise
Explanation: Used in European guidelines to assess night-time aviation noise. - The “Awaaz Foundation” in India focuses on:
a) Air quality
b) Noise pollution awareness
c) Waste management
d) Forest conservation
Answer: b) Noise pollution awareness
Explanation: The NGO raises awareness and legal action against excessive noise levels.
