Q. मनुष्यों के लिए मानक ध्वनि स्तर है-

(A) 90DB
(B) 60DB
(C) 120DB
(D) 100DB

✅ Correct Answer: (B) 60DB

Published by Ravi Chauhan ⭐ 11.26K Points at 17-Oct-2021 07:54 am in Physics

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