1. Which gas is the major component of air?

• Oxygen
• Carbon dioxide
• Nitrogen
• Hydrogen

2. Which of the following is a major cause of air pollution?

• Growing trees
• Burning fossil fuels
• Using solar energy
• Rainwater harvesting

3. Which gas is released by vehicles and causes respiratory problems?

• Nitrogen
• Oxygen
• Carbon monoxide
• Hydrogen

4. What is the main cause of acid rain?

• Dust in the air
• Sulphur dioxide and nitrogen oxides
• Pollen grains
• Carbon monoxide

5. Which of the following can reduce air pollution?

• Burning garbage
• Planting more trees
• Using diesel vehicles
• Deforestation

6. Which of these is not a greenhouse gas?

• Carbon dioxide
• Methane
• Nitrogen
• Water vapour

7. Which layer of the atmosphere contains the ozone layer?

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

8. What does the ozone layer protect us from?

• Dust particles
• Ultraviolet rays
• Radio waves
• Infrared rays

9. Which practice causes water pollution?

• Drip irrigation
• Discharging sewage into rivers
• Building check dams
• Rainwater harvesting

10. Which is a major pollutant from burning coal?

• Helium
• Sulphur dioxide
• Hydrogen
• Methane

11. Which device is used in vehicles to reduce air pollution?

• Odometer
• Catalytic converter
• Speedometer
• Air filter

12. Which of these leads to water pollution in rivers?

• Immersing idols
• Using compost
• Filtering water
• Building tanks

13. What is the process of purifying water using physical and chemical methods?

• Irrigation
• Water harvesting
• Water treatment
• Filtration

14. Which gas is responsible for global warming?

• Nitrogen
• Carbon dioxide
• Oxygen
• Hydrogen

15. Which of the following is a natural cause of air pollution?

• Volcanic eruption
• Vehicles
• Factories
• Firecrackers

16. What does CNG stand for?

• Condensed Natural Gas
• Carbon Nitrogen Gas
• Compressed Natural Gas
• Converted Nitrogen Gas

17. Which harmful chemical is present in acid rain?

• Sulphuric acid
• Nitric acid
• Both A and B
• Carbonic acid

18. Which of these practices helps prevent water pollution?

• Throwing plastic in rivers
• Treating sewage before discharge
• Dumping industrial waste
• Using chemical pesticides

19. How can oil spills affect aquatic life?

• Helps plants grow
• Creates fresh water
• Kills marine animals
• Purifies water

20. Which international day is observed to raise awareness about the environment?

• Water Day
• Earth Day
• Rain Day
• Wind Day

21. Which of the following is a biodegradable pollutant?

• Plastic
• Sewage
• Glass
• Metal cans

22. Which of the following is a non-biodegradable waste?

• Vegetable peels
• Paper
• Plastic
• Cotton

23. How does air pollution affect human health?

• Improves digestion
• Causes respiratory issues
• Increases vision
• Cures diseases

24. Which harmful gas is produced in landfills?

• Methane
• Carbon monoxide
• Ozone
• Oxygen

25. Which method helps clean the exhaust from factories?

• Open chimneys
• Electrostatic precipitators
• Oil filters
• Boilers

26. Which act in India deals with water pollution control?

• Water Act 1974
• Air Act 1981
• Pollution Act 1999
• Clean River Act 2000

27. What is smog?

• Clean fog
• Smoke + fog
• Sulphur gas
• Carbon layer

28. Which organ is most affected by air pollution?

• Liver
• Lungs
• Heart
• Kidney

29. Which aquatic plant indicates clean water?

• Algae
• Water hyacinth
• Lotus
• Phytoplankton

30. Which of these is a renewable source of energy?

• Coal
• Petroleum
• Wind
• Diesel

31. Burning of fossil fuels leads to:

• Reduction of CO2
• Global warming
• Water purification
• Ozone production

32. Which river is most polluted in India?

• Ganga
• Yamuna
• Krishna
• Godavari

33. What causes algal bloom in water bodies?

• Clean water
• Excess nutrients from fertilizers
• Lack of oxygen
• Boiling water

34. Which of these is a major source of indoor air pollution?

• Fresh air
• Mosquito repellents
• Plants
• Rainwater

35. One way to conserve water is:

• Leave taps open
• Fix leaking taps
• Use hosepipes
• Over-irrigate

36. What is noise pollution measured in?

• Watts
• Hertz
• Decibels
• Meters

37. Which of the following is an effect of water pollution?

• Better health
• Disease spread
• Increase in fish
• Clean rivers

38. Which air pollutant is known to damage the ozone layer?

• CO2
• CFCs
• Methane
• Hydrogen

39. What is the best way to manage solid waste?

• Open dumping
• Burning
• Landfilling and recycling
• Throwing in rivers