Category : 5th Class
It is the loud unwanted and undesirable sound. Sound at 80 decibel or more gives unpleasant experience and regarded as noise pollution. 90% of noise pollution is due to the noise produced by the motor vehicles etc.
Look at the following picture of the causes of noise pollution:
Classification of Sound in Decibel (db)
Sounds Decibel (db)
Normal talking 40 db
Whisper 20 db
Aircraft 120 db
Atomic explosion 200 db
Intensity of sound greater than 80 db causes noise pollution.
Consequences of Noise Pollution
Noise Causes Disease
Our ears are sensible organs which work properly on a specific range of sound.
The brain receives the incoming signal from the ears and analyze it. If the intensity of sound increases, it can damage the nervous system and ultimately may lead to hearing loss. The intensity of sound, which is greater than the sensible capacity of our ears is called loud and unpleasant sound. The effect of unpleasant sound on our head is just like inserting nails in the sensitive head.
How to Protect Ourselves from Unpleasant Sound
Look at the following table to understand the method by which, we can protect ourselves from unpleasant sound::
Arwin is playing violin and his sister Tina is listening music from the loudspeaker. Which one of the two children is creating more noise pollution as compare to other?
(c) Both Arwin and Tina
(d) Neither Arwin nor Tina
(e) None of these
Sound of violin is pleasant but sound of a loudspeaker is always noise because it is at high volume. Therefore, option (b) is correct and rest of the options is incorrect.
Consider the following statements:
Statement 1: A fire engine produces noise pollution.
Statement 2: Leaves falling off a trees produces noise pollution.
Which one of the following is correct about the above statements?
(a) Statement 1 is true and 2 is false
(b) Statement 1 is false and 2 is true
(c) Both 1 and 2 are false
(d) Both 1 and 2 are true
(e) None of these
Falling of leaves from the trees produces sound of very low decibel that doesn't come under pollution. Therefore, option (a) is correct and rest of the options is incorrect.
The WHO has estimated 25% death in developing countries are due to environmental problem.
Children, woman and old people are more vulnerable than male adults.
Developed countries put sufficient legal, political, cultural and social pressure on the polluters.
There are about 500 million cars in the world which is expected to be doubled by 2030.
A plastic milk jug takes million years to decompose.
More than 100 active pesticides ingredients are suspected of causing cancer.
Untreated sewage is a significant risk to human health and wealth.
Nitrogen is essential for crops but too much will leak into underground and rivers causing water pollution.
You need to login to perform this action.
You will be redirected in 3 sec