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WBCS Preliminary Examination 2019 — General Studies · Question 108 of 200

Q108
General ScienceEnvironment & Ecology
Noise pollution is created if noise is in excess of
  1. a.70-75 dB
  2. b.50-60 dB
  3. c.80-99 dB
  4. d.40-65 dB

Answer: (C) 80-99 dB

Sustained noise levels above roughly 80-90 decibels are generally considered harmful to human hearing and well-being, and are treated as "noise pollution" under Indian environmental/pollution-control norms.

Q107 Whole paperQ109