railway RRB JE (CBT I + CBT II) Mock Test 2024 People Development & Environment Environmental Issues Pollution

ध्वनि प्रदूषण को ___________से अधिक ध्वनि के कारण माना जाता है। 

1
100 डेसिबल 
2
50 डेसिबल 
3
120 डेसिबल 
4
150 डेसिबल 
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