<prompt> Acceptable noise level in industries -25-30 dB30-40 dB40-50 dB60-80 dB  <response>: Ans. is c i.e., 40 50 dBAcceptable Noise levelsEnvironmentPlaceAcceptable noise level dB AResidentialBed room25Living room40 Office35-45CommercialConference40-45 Restaurants40-60IndustrialWorkshoopWorkshoop40-6040-50EducationalClass room30-40Library35 - 40HospitalsWards20-35 