1. Which gas is the major contributor to the greenhouse effect?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium
Answer: C) Carbon dioxide
2. Acid rain is mainly caused by the presence of which gases in the atmosphere?
A) Oxygen and Nitrogen
B) Sulfur dioxide and Nitrogen oxides
C) Carbon monoxide and Methane
D) Hydrogen and Ozone
Answer: B) Sulfur dioxide and Nitrogen oxides
3. The main source of carbon monoxide in urban areas is:
A) Volcanic eruptions
B) Forest fires
C) Vehicle exhaust
D) Oceans
Answer: C) Vehicle exhaust
4. Smog is a combination of smoke and:
A) Fog
B) Rain
C) Snow
D) Dust
Answer: A) Fog
5. Which pollutant is responsible for depletion of the ozone layer?
A) Carbon dioxide
B) Chlorofluorocarbons (CFCs)
C) Nitrogen
D) Oxygen
Answer: B) Chlorofluorocarbons (CFCs)
6. Particulate matter (PM2.5) mainly affects which part of the body?
A) Skin
B) Digestive system
C) Respiratory system
D) Muscles
Answer: C) Respiratory system
7. Which natural event can cause air pollution?
A) Photosynthesis
B) Volcanic eruption
C) Evaporation
D) Condensation
Answer: B) Volcanic eruption
Water Pollution
8. The main cause of water pollution in rivers near cities is:
A) Sewage discharge
B) Wind
C) Sunlight
D) Rocks
Answer: A) Sewage discharge
9. Eutrophication is caused by excess of:
A) Oxygen
B) Nutrients
C) Salt
D) Sand
Answer: B) Nutrients
10. Oil spills mainly affect:
A) Desert ecosystems
B) Marine life
C) Mountain soil
D) Air temperature
Answer: B) Marine life
11. Which microorganism contamination in water causes diseases like cholera?
A) Virus
B) Bacteria
C) Fungi
D) Algae
Answer: B) Bacteria
12. Biochemical Oxygen Demand (BOD) indicates:
A) Amount of carbon dioxide
B) Oxygen needed by microorganisms
C) Amount of nitrogen
D) Water temperature
Answer: B) Oxygen needed by microorganisms
13. Which heavy metal pollution in water is highly toxic?
A) Sodium
B) Mercury
C) Calcium
D) Potassium
Answer: B) Mercury
14. Industrial waste discharged into rivers mainly leads to:
A) Soil formation
B) Water purification
C) Water contamination
D) Rainfall
Answer: C) Water contamination
Soil Pollution
15. Excessive use of pesticides leads to:
A) Soil enrichment
B) Soil pollution
C) Soil cooling
D) Soil erosion only
Answer: B) Soil pollution
16. Which material takes the longest time to decompose in soil?
A) Paper
B) Food waste
C) Plastic
D) Leaves
Answer: C) Plastic
17. Soil pollution can reduce:
A) Crop productivity
B) Rainfall
C) Wind speed
D) Cloud formation
Answer: A) Crop productivity
18. Landfills mainly contribute to:
A) Water purification
B) Soil and groundwater pollution
C) Air cooling
D) Photosynthesis
Answer: B) Soil and groundwater pollution
19. Heavy metals in soil can enter the food chain through:
A) Air
B) Plants
C) Clouds
D) Rocks
Answer: B) Plants
20. Which activity increases soil contamination?
A) Organic farming
B) Composting
C) Dumping industrial waste
D) Crop rotation
Answer: C) Dumping industrial waste
21. Soil salinity increases mainly due to:
A) Excess irrigation
B) Forest growth
C) Rainfall
D) Wind
Answer: A) Excess irrigation
Noise Pollution
22. Noise level is measured in:
A) Watts
B) Decibels
C) Joules
D) Volts
Answer: B) Decibels
23. Continuous exposure to high noise can cause:
A) Better hearing
B) Hearing loss
C) Stronger eyesight
D) Faster growth
Answer: B) Hearing loss
24. Major source of urban noise pollution is:
A) Birds
B) Traffic
C) Trees
D) Rivers
Answer: B) Traffic
25. Which device is used to measure noise intensity?
A) Thermometer
B) Barometer
C) Sound level meter
D) Hygrometer
Answer: C) Sound level meter
26. Noise pollution mainly affects which system of the human body?
A) Digestive system
B) Circulatory system
C) Nervous system
D) Skeletal system
Answer: C) Nervous system
27. Prolonged noise exposure may lead to:
A) Hypertension
B) Improved memory
C) Better sleep
D) Strong immunity
Answer: A) Hypertension
General Pollution
28. The term “pollution” refers to:
A) Natural balance
B) Addition of harmful substances into the environment
C) Clean environment
D) Soil formation
Answer: B) Addition of harmful substances into the environment
29. Which practice helps reduce pollution?
A) Burning plastic
B) Recycling waste
C) Dumping garbage in rivers
D) Cutting trees
Answer: B) Recycling waste
30. The best way to control pollution is:
A) Ignoring waste
B) Increasing industries
C) Environmental awareness and sustainable practices
D) More fossil fuel use
Answer: C) Environmental awareness and sustainable practices