A) 10-20 dB
B) 30-60 Db
C) 70-90 dB
D) 120-150 dB
Correct Answer: B
Solution :
The word noise is taken from the latin word nausea and is defined as unwanted or unpleasant sound that causes discomfort. Intensity of some noise sources is as follows:| Source | Intensity (dB) |
| Breathing | 10 |
| Broadcasting studio | 20 |
| Trickling clock | 30 |
| Library | 30-35 |
| Normal conversation | 35-60 |
| Telephone | 60 |
| Office noise | 60-80 |
| Alarm clock | 70-80 |
| Traffic | 50-90 |
| Motor cycle | 105 |
| Jet fly (over 1000?) | 100-110 |
| Train whistle (50?) | 110 |
| Air craft (100?) | 110-120 |
| Commercial jet air craft (100?) | 120-140 |
| Space rocket (launching) | 170-180 |
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