Teaching CG Vyapam Assistant Teacher 2024 Mock Test General Knowledge Ecology and Environment Environmental pollution

किस स्तर से ऊपर की ध्वनि (डेसीबल में) खतरनाक ध्वनि प्रदूषण मानी जाती है?

1
30 dB
2
40 dB
3
60 dB
4
80 dB
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