UPSC CSE Prelims 2000
A noise level of 100 decibels (dB) typically corresponds to the intensity of sound produced in environments such as a machine shop. This level is significantly loud and can be damaging with prolonged exposure.
A. Just audible sound is approximately 0 dB, representing the threshold of human hearing.
B. Ordinary conversation typically ranges from 50 to 60 dB, which is a moderate sound level.
C. Sound from a noisy street generally falls within the range of 70 to 80 dB, which is louder than conversation but less intense than a machine shop.