engineering recuitment Maharashtra WCD Water Conservation Officer Mock Test 2024 General Knowledge Ecology and Environment Environmental pollution

শব্দের মাত্রা কোন মাত্রার বেশি হলে শব্দ দূষণ তৈরি হয়? 

1
70-75 dB
2
50-60 dB
3
80-99 dB
4
40-65 dB
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