1. : Which gas is mainly responsible for acid rain?
(A) Oxygen
(B) Sulfur dioxide
(C) Carbon monoxide
(D) Hydrogen
2. : The major pollutant released by automobiles is?
(A) Carbon monoxide
(B) Methane
(C) Nitrogen
(D) Ozone
3. : Which chemical is primarily responsible for ozone layer depletion?
(A) Methane
(B) CFCs (Chlorofluorocarbons)
(C) Sulfur dioxide
(D) Nitrogen oxides
4. : BOD in water analysis stands for?
(A) Basic Oxygen Demand
(B) Biological Oxygen Demand
(C) Biochemical Oxygen Demand
(D) Bacterial Oxygen Demand
5. : Which pollutant is mainly responsible for photochemical smog?
(A) Carbon dioxide
(B) Nitrogen oxides
(C) Methane
(D) Helium
6. : Which metal is a major contaminant of groundwater in some regions of South Asia?
(A) Mercury
(B) Arsenic
(C) Zinc
(D) Lead
7. : The main greenhouse gas emitted by human activities is?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Hydrogen
8. : Which isotope is commonly used to study radioactive pollution?
(A) Carbon-12
(B) Carbon-14
(C) Oxygen-16
(D) Hydrogen-2
9. : Which chemical is used in water treatment for disinfection?
(A) Nitrogen
(B) Chlorine
(C) Hydrogen
(D) Helium
10. : Eutrophication of lakes is mainly caused by excess?
(A) Sulfur
(B) Phosphates and nitrates
(C) Oxygen
(D) Helium
11. : PAN (Peroxyacetyl nitrate) is a major component of?
(A) Acid rain
(B) Photochemical smog
(C) Greenhouse gases
(D) Radioactive waste
12. : Which heavy metal causes “Minamata disease”?
(A) Lead
(B) Cadmium
(C) Mercury
(D) Arsenic
13. : Which gas is used as a refrigerant and contributes to ozone depletion?
(A) Chlorofluorocarbon
(B) Oxygen
(C) Argon
(D) Methane
14. : The chemical formula of ozone is?
(A) O
(B) O₂
(C) O₃
(D) O₄
15. : Which pollutant causes “blue baby syndrome”?
(A) Sulfates
(B) Nitrates
(C) Phosphates
(D) Carbon monoxide
16. : Which of the following is the main source of indoor air pollution in developing countries?
(A) LPG
(B) Kerosene oil
(C) Biomass burning
(D) Natural gas
17. : Which gas contributes most to the greenhouse effect after carbon dioxide?
(A) Nitrous oxide
(B) Methane
(C) Ozone
(D) Water vapor
18. : The pH of normal rainwater is approximately?
(A) 5.6
(B) 6.5
(C) 7.0
(D) 8.5
19. : Which heavy metal causes “Itai-Itai disease”?
(A) Arsenic
(B) Lead
(C) Cadmium
(D) Mercury
20. : Which pollutant is mainly responsible for global warming?
(A) Oxygen
(B) Carbon dioxide
(C) Argon
(D) Helium
21. : Which chemical is used to remove hardness of water?
(A) Baking soda
(B) Zeolite
(C) Salt
(D) Lime
22. : The term COD in water analysis stands for?
(A) Chemical Oxygen Demand
(B) Combined Oxygen Density
(C) Carbon Oxide Deposition
(D) Chlorine Oxygen Demand
23. : Which gas is responsible for the pungent smell after lightning?
(A) Ozone
(B) Carbon monoxide
(C) Sulfur dioxide
(D) Methane
24. : Which is the main pollutant from burning coal?
(A) Sulfur dioxide
(B) Oxygen
(C) Methane
(D) Argon
25. : Which radioactive element caused pollution in Chernobyl disaster?
(A) Uranium
(B) Cesium
(C) Radon
(D) Iodine
26. : Which chemical is used in sewage treatment to kill bacteria?
(A) Chlorine
(B) Oxygen
(C) Nitrogen
(D) Phosphorus
27. : Which air pollutant causes respiratory disease “silicosis”?
(A) Asbestos fibers
(B) Sulfur dioxide
(C) Silicon dust
(D) Carbon monoxide
28. : Greenhouse gases trap which type of radiation?
(A) Ultraviolet radiation
(B) Infrared radiation
(C) X-rays
(D) Gamma rays
29. : Which gas is known as laughing gas and also contributes to global warming?
(A) Carbon monoxide
(B) Methane
(C) Nitrous oxide
(D) Sulfur dioxide
30. : Which pollutant is the major cause of smog in cities?
(A) Nitrogen oxides and hydrocarbons
(B) Oxygen and hydrogen
(C) Helium and neon
(D) Carbon and sulfur