Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Knowledge Ecology and Environment Environmental pollution
Noise pollution is created if sound is in excess to
1
70-75 dB
2
50-60 dB
3
80-99 dB
4
More than one of the above
5
None of the above