Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Physics Waves Intensity and Sound Level
According to the Central Pollution Control Board (CPCB), what is the upper limit of sound for residential area?
1
45 Decibels
2
55 Decibels
3
75 Decibels
4
90 Decibels
5
None of the above