Question

A prolonged exposure to noise at 95 dB can produce
a. Respiratory trouble
b. Skin cancer
c. Nervous tension and increased blood pressure
d. Digestive spasm

Answer 1

Hint: Noise is the undesirable sound that is considered loud, unpleasant, or disruptive to hear. There are many sources of noise such as vehicles, man's vocal cord, running engine, a vibrating loudspeaker diaphragm. Noise is measured in logarithmic units called decibels(dB). Above the normal level, the sound turns into noise and affects the individual.

Complete answer:
> An undesirable high level of sound is called noise, measured in decibel(dB). The normal hearing range in human beings is up to 120 dB. An ordinary conversation we can hear at 50 dB, but the sound above 120 dB is harmful. It has been observed that prolonged exposure to noise at 95 dB will produce deafness, a rise in blood pressure, and nervous tension.
Noise above 70 dB for a long period of time begins to damage the hearing power. Noise above 120 dB which is very loud immediately causes harm to the ears.

> Respiratory troubles are caused by air pollution, not by noise pollution.

> Skin cancer is caused by the exposure of the skin to the ultraviolet rays from sunlight.

> Excessive gas in the intestines leads to the digestive spasms.

Hence, the correct answer is option (C).

Additional information:
- Communication difficulties also arise due to the loud noise.
- It affects human beings as well as wildlife.
- There are various control measures by which we can control or reduce noise pollution to protect individuals.

Note: Exposure to prolonged or excessive noise has been found to cause a wide range of health problems such as poor concentration, stress, cardiovascular disorders, anxiety, fatigue, sleeping disturbance, tinnitus, and cognitive impairment. It increases the level of cholesterol in the blood which in turn increases the high blood pressure. Noise above 70 dB causes an increase in blood pressure and nervous tension.