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A brief exposure to 150 dB sound may...

A brief exposure to 150 dB sound may

A

damage ear drums

B

cause permanent impairing hearing ability

C

cause temporary impairing hearing ability

D

Both (a) and (b)

Text Solution

Verified by Experts

The correct Answer is:
D
A brief exposure to extremely high sound level, 150 dB or more generated by take off of a jet plane or rocket, may damage ear drums, thus permanently impairing hearing ability.
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Hearing may be damaged by excessive noise. So our ear sometimes need protection from continuous loud sound. Hearing damage depends on the sound intensity level (decibel level) and the exposure time, and the exact combinations vary for different people. Normally, at 90 dB , it takes 8 hours or less for the damage to receptor nerves to occur. further, it is found that if the sound level is increased by 5 dB , the safe exposure limit is cut to half. (a) How long will it take for a sound of a very loud lawn mower (or a motorcycle) of 95 dB to damage the hearing ? (b) What is the nonstop exposure time for a 105 dB sound to damage the ear ? ( c) What should be done to protect the society from the danger of losing the divine gift of hearing power ?

Assertion : A brief expoosure to extremely high sound level, 150dB or more generated by take off of a jet plane or rocket, may damage ear drum or dislocate ear ossicles and permanently impair the hearing ability. Reason : In India, the Air (Prevention and Control of Pollution ) Act came into force in 1981, but was amended in 1987 to include noise as an air pollutant.

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NCERT FINGERTIPS-ENVIRONMENTAL ISSUES-Environmental Issues
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  2. In India, Air (Prevention and Control of Pollution ) Act came into for...

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  3. A brief exposure to 150 dB sound may

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  4. A prolonged exposure to noise at 95 dB produce

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  5. Noise pollution may cause nervousness and irritability by stimulating ...

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  6. Noise cause

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  7. Which of the following actions can be taken to control noise pollution...

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  10. The amount of biodergradable organic matter in sewage water can be est...

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  11. The graph given below represents the effect of sewage discharge on som...

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  12. A lake with an inflow of domestic sewage rich in organic waste may res...

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