Q12 of 55 Page 113

The loudness of a sound that a person can withstand without discomfort is about

The standard unit to measure noise is decibels (dB).Noise below 80 dB is bearable but prolonged exposure to noise above 80dB turns into noise pollution which is painful and hazardous as it gradually leads to permanent loss of hearing power.

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10

Among the following which one causes more indoor chemical pollution?

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The green scum seen in the fresh water bodies is

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The major source of noise pollution worldwide is due to

 14

Match the following and choose the correct option

The correct matches is;