ध्वनि या ध्वनि प्रदूषण माप – McqOptions

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1.	ध्वनि या ध्वनि प्रदूषण मापा जाता है:
A.	Phon
B.	इसलिए
C.	डेसिबल
D.	दशमलव
Answer» B. इसलिए

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