Question

Green muffler scheme helps to reduce
A) Air pollution
B) Noise pollution
C) E-wastes
D) Both A and B

Answer 1

Hint: Here word green, which means nature. Nature relates to trees and thinks about which pollution is controlled by trees.

Complete answer:
A muffler is a device that decreases the amount of noise emitted by the exhaust of an internal combustion engine.
Green muffler also known as green belt vegetation is a row of trees and shrubs grown and maintained to serve as noise absorbers. It helps in reduction of air pollution by absorbing pollutant gases and causes settling of suspended particulate matter or dust generated by moving vehicles. Green plants are grown near the noisy places like roadsides and industrial areas so that they can obstruct noise reaching citizens.
In this scheme, Plants like Neem and Ashoka are planted near houses and residential localities to reduce noise pollution, which filters out the noise and does not let it reach populated areas. In general noise is measured in decibels.
These dense trees reduce noise pollution. It filters the sound from reaching the citizens. A soft ground is an efficient noise absorber. So, avoid hard surfaces to plant trees. Cultivating the ground before planting and adding organic matter to the surface of the soil may also help to reduce noise.

Hence, option A is the correct answer.

Notes:Plants are also helpful in absorption of pollutant gases and micro particles of soil. According to the USDA National Agroforestry Centre buffer of trees and shrubs can reduce noise by about 10 decibels or about 50% as perceived by the human ear.