| [ A ] 50 dB |
|
| [ B ] 60 dB | ![]() |
| [ C ] 65 dB | |
| [ D ] 75 dB |
| [ A ] 50 dB |
|
| [ B ] 60 dB | ![]() |
| [ C ] 65 dB | |
| [ D ] 75 dB |
| Answer : Option B |
| Explanation : |
| The permissible level is 60 dB |
Copyright 2018 | Privacy Policy | Terms and Conditions | Contact us | Advertise
@