51. Which gas contributes most to acid rain formation?
A) CO₂
B) SO₂
C) O₂
D) H₂
Answer: B
52. The Kyoto Protocol is related to:
A) Water pollution
B) Climate change
C) Soil erosion
D) Noise pollution
Answer: B
53. The Montreal Protocol aims to:
A) Reduce CO₂
B) Protect ozone layer
C) Stop deforestation
D) Reduce noise
Answer: B
54. Which gas is known as laughing gas?
A) NO
B) NO₂
C) N₂O
D) NH₃
Answer: C
55. The major source of methane is:
A) Volcanoes
B) Wetlands
C) Oceans
D) Rocks
Answer: B
56. Chlorine radicals destroy:
A) Oxygen
B) Nitrogen
C) Ozone
D) Hydrogen
Answer: C
57. Which pollutant is released from burning coal?
A) SO₂
B) O₂
C) N₂
D) H₂
Answer: A
58. The main cause of soil pollution is:
A) Water
B) Chemicals
C) Oxygen
D) Nitrogen
Answer: B
59. Which element causes eutrophication?
A) Sodium
B) Nitrogen
C) Iron
D) Calcium
Answer: B
60. Thermal power plants release:
A) Cold water
B) Hot water
C) Pure water
D) No water
Answer: B