Environmental Issues
Multiple Choice Questions and Answers
1. Ultraviolet rays of the sunlight results in formation of
(a) Carbon monoxide
(b) Sulphur Dioxide
(c) Ozone
(d) Fluorides
Answer: (c) Ozone
2. Which of the following will not cause any atmospheric pollution?
(a) Hydrogen
(b) Sulphur Dioxide
(c) Carbon dioxide
(d) Carbon monoxide
Answer: (a) Hydrogen
3. Sewage water can be purified for recycling with the action of
(a) aquatic plants
(b) penicillin
(c) microorganisms
(d) fishes
Answer: (c) microorganisms
4. Today, concentration of greenhouse gases is high because of
(a) use of refrigerator
(b) increased combustion of oil and coal
(c) deforestation
(d) all of the above
Answer: (d) all of the above
5. Photochemical smog is related to the pollution of
(a) soil
(b) water
(c) noise
(d) air
Answer: (d) air
6. Most important causative pollutant of soil maybe
(a) plastics
(b) iron junks
(c) detergents
(d) glass junks
Answer: (a) plastics
7. Taj Mahal is threatened due to the effect of
(a) chlorine
(b) sulphur dioxide
(c) oxygen
(d) hydrogen
Answer: (a) chlorine
8. When huge amount of sewage is dumped into a river the BOD will
(a) increase
(b) remain unchanged
(c) slightly decrease
(d) decrease
Answer: (c) slightly decrease
9. Which is a fungicide?
(a) 2,4-D
(b) DDT
(c) Bordeaux mixture
(d) BHC
Answer: (c) Bordeaux mixture
10. Rotenone is
(a) a bioherbicide
(b) an insect hormone
(c) a natural herbicide
(d) a natural insecticide
Answer: (b) an insect hormone
11. Which of the following is not produced as exhaust of vehicles?
(a) sulphur dioxide
(b) carbon dioxide
(c) carbon monoxide
(d) fly ash
Answer: (c) carbon monoxide
12. Smog is
(a) smoke
(b) other name for dust storm
(c) moistened air gases
(d) smoke and fog
Answer: (c) moistened air gases
13. The most dangerous metal pollutant of automobile exhaust is
(a) cadmium
(b) silver
(c) lead
(d) manganese
Answer: (c) lead
14. Which one of the following is a greenhouse gas?
(a) carbon dioxide
(b) carbon monoxide
(c) ozone
(d) oxygen
Answer: (a) carbon dioxide
15. Smog produces
(a) O3
(b) NO2
(c) CH4
(d) Aluminium Ion
Answer: (d) Aluminium Ion
16. Depletion of ozone layer is due to oxide of
(a) carbon
(b) phosphorus
(c) nitrogen
(d) none
Answer: (c) nitrogen
17. Formation of ozone is maximum over
(a) Antarctica
(b) Africa
(c) Europe
(d) India
Answer: (c) Europe
18. Oxidation Ponds involve
(a) chemical removal of pollutants
(b) mechanical screening of pollutants
(c) biological reduction of organic matter
(d) none of the above
Answer: (c) biological reduction of organic matter
19. Natural sink of stratospheric ozone layer is
(a) SO2
(b) HCF
(c) Freons
(d) Sulphur flux of oceans
Answer: (b) HCF
20. Water pollution is mainly caused by
(a) decay of bodies of aquatic animals
(b) industrial effluents
(c) excessive rain
(d) growth of phytoplankton
Answer: (d) growth of phytoplankton
21. Which of the following is usually not classified as atmospheric pollutant?
(a) CO2
(b) CO
(c) NOx
(d) SO2
Answer: (c) NOx
22. The sound above what level is considered as harmful?
(a) above 40 db
(b) above 60 db
(c) above 80 db
(d) above 120 db
Answer: (c) above 80 db
23. Which of the following is a secondary air pollutant?
(a) SO2
(b) NO2
(c) PAN
(d) Aerosol
Answer: (c) PAN
24. Peeling of ozone umbrella, which protects us from UV rays, is caused by
(a) CFC’s
(b) coal burning
(c) CO2
(d) PAN
Answer: (a) CFC’s
25. Greenhouse effect is caused by
(a) CO2 only
(b) CH4, SO2, NO2
(c) Those gases which absorb the infra red light reflecting from earth
(d) None of the above
Answer: (c) Those gases which absorb the infra red light reflecting from earth
26. The result of ozone hole is
(a) acid rain
(b) global warming
(c) the UV radiations reach the earth
(d) greenhouse effect
Answer: (b) global warming
27. ‘Ozone hole’ means
(a) increase in the concentration of ozone
(b) decrease in the concentration of ozone
(c) same concentration of ozone
(d) hole in the stratosphere
Answer: (b) decrease in the concentration of ozone
28. DDT is a
(a) Non-pollutant
(b) Non-biodegradable pollutant
(c) Biodegradable pollutant
(d) None
Answer: (b) Non-biodegradable pollutant
29. Which of the following gases contribute to the global warming?
(a) carbon monoxide
(b) sulphur dioxide
(c) carbon dioxide
(d) nitrogen dioxide
Answer: (c) carbon dioxide
30. Common indicator organism of water pollution is
(a) Entamoeba histolytica
(b) Lemna
(c) Eichhornia
(d) Escherichia coli
Answer: (d) Escherichia coli
31. Maximum air pollution is caused by
(a) smoke
(b) insecticide
(c) industry
(d) automobile exhaust
Answer: (d) automobile exhaust
32. Bhopal gas tragedy of 1984 was caused by the leakage of
(a) methyl isocyanate
(b) 2-4 dichlorophenoxyacetic acid
(c) ammonia
(d) hydrogen cyanide
Answer: (a) methyl isocyanate
33. Insecticides usually act upon
(a) muscular system
(b) digestive system
(c) nervous system
(d) circulatory system
Answer: (c) nervous system
34. Black lung disease is common in
(a) farmers
(b) workers of petrochemical industry
(c) coal miners
(d) refinery workers
Answer: (c) coal miners
35. An indicator species of polluted water is
(a) Tubifex
(b) phytoplankton
(c) zooplankton
(d) prawn
Answer: (a) Tubifex
36. Eutrophication is often seen in
(a) deserts
(b) freshwater lakes
(c) oceans
(d) mountains
Answer: (b) freshwater lakes
37. Secondary sewage treatment is mainly a
(a) physical process
(b) mechanical process
(c) chemical process
(d) biological process
Answer: (d) biological process
38. ‘Good Ozone’ is found in
(a) mesosphere
(b) troposphere
(c) stratosphere
(d) ionosphere
Answer: (c) stratosphere
39. Chipko movement was first led by
(a) Sunderlal Bahuguna
(b) Rajiv Gandhi
(c) Ramdev Mishra
(d) Indira Gandhi
Answer: (a) Sunderlal Bahuguna
40. Green muffler is used against which type of pollution?
(a) air
(b) soil
(c) water
(d) noise
Answer: (d) noise
41. UV radiations cause
(a) formation of thymine dimers
(b) deletion of base pairs
(c) methylation of bases
(d) addition of base pairs
Answer: (a) formation of thymine dimers
42. Which is a non biodegradable pollutant?
(a) Savage
(b) Sulphur Dioxide
(c) Oxides of Nitrogen
(d) Lead vapour
Answer: (d) Lead vapour
43. Carbon dioxide is called as greenhouse gas because
(a) it is involved in photosynthesis
(b) it emits light
(c) it traps infrared radiation
(d) none
Answer: (c) it traps infrared radiation
44. Some effects of SO2 and its transformation products on plants include
(a) chlorophyll destruction
(b) plasmolysis
(c) Golgi body destructions
(d) none
Answer: (a) chlorophyll destruction
45. Lichens are important in the studies on atmospheric pollution because they
(a) can also grow in greatly polluted atmosphere
(b) can readily multiply in polluted atmosphere
(c) efficiently purify the atmosphere
(d) are sensitive to pollutants
Answer: (d) are sensitive to pollutants
46. If water pollution continuous at its present rate, it will eventually
(a) stop water cycle
(b) prevent precipitation
(c) make oxygen molecules unavailable to water plants
(d) make nitrogen molecules unavailable to water plants
Answer: (c) make oxygen molecules unavailable to water plants
47. All the following contribute to pollution except
(a) thermal power plant
(b) automobiles
(c) nuclear power plant
(d) hydroelectric power plant
Answer: (d) hydroelectric power plant
48. The molecular action of ultraviolet light is mainly reflected through
(a) destruction of hydrogen bonds in DNA
(b) photo dynamic action
(c) formation of pyrimidine
(d) formation of sticky metaphase
Answer: (a) destruction of hydrogen bonds in DNA
49. Thermal pollution of water bodies is due to discharge of
(a) chemicals from industries
(b) heat from power plants
(c) agricultural run-off water
(d) wastes from mining
Answer: (b) heat from power plants
50. Biologists celebrate 5th June as
(a) Darwin’s birthday
(b) World Hygiene Day
(c) World Environment Day
(d) World Population Day
Answer: (c) World Environment Day
51. Spraying of DDT on crops produces pollution of
(a) soil and water only
(b) air and soil only
(c) air, soil and water
(d) air and water only
Answer: (a) soil and water only