Q. dB is a standard abbreviation used for the quantitative expression of
A) A certain pesticide
B) The density of bacteria in a medium
C) A particular pollutant
D) The dominant Bacillus in a culture
Explanation
[Solution from source] The decibel (dB) is the unit used to measure sound level, so it expresses noise, which is a pollutant. Sound above about 150 dB can damage the eardrum. It has nothing to do with pesticides or bacterial counts. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.