defence exam Army Havildar SAC Mock Test Series 2025 General Knowledge Ecology and Environment Environmental pollution

मानवों के लिए सुरक्षित ध्वनि तीव्रता का स्तर कितना है?

1
55 डेसिबल
2
70 डेसिबल
3
105 डेसिबल
4
125 डेसिबल
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