मनुष्यों के लिये मानक ध्वन – McqOptions

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1.	मनुष्यों के लिये मानक ध्वनि स्तर है -
A.	90 डेसिबल
B.	60 डेसिबल
C.	120 डेसिबल
D.	100 डेसिबल
Answer» C. 120 डेसिबल

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