ध्वनि प्रदूषण की इकाई क्या – McqOptions

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1.	ध्वनि प्रदूषण की इकाई क्या है।
A.	पी.पी.एम
B.	डाब्सन
C.	डेसिबल
D.	उपरोक्त में से कोई नहीं
Answer» D. उपरोक्त में से कोई नहीं

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