मनुष्यों के लिए मानक ध्वनि क्या स्तर है? Manushya Ke Liye Manak Dhoni Star Kya Hai?
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मनुष्यों के लिए मानक ध्वनि क्या स्तर है? Manushya Ke Liye Manak Dhoni Star Kya Hai?

मनुष्यों के लिए मानक ध्वनि क्या स्तर है? Manushya Ke Liye Manak Dhoni Star Kya Hai?
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मनुष्यों के लिए मानक ध्वनि क्या स्तर है? Manushya Ke Liye Manak Dhoni Star Kya Hai?

(A) 90db

(B) 60db

(C) 120db

(D) 100db
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मनुष्यों के लिए मानक ध्वनि स्तर 60 db होता है। अतः इन विकल्पों में से विकल्प (B) सही उत्तर होगा।

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