ध्वनि मीटर का उपयोग करके श� – McqOptions

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1.	ध्वनि मीटर का उपयोग करके शोर को मापा जाता है और इकाई है
A.	हेटर्स
B.	डेसिबल
C.	जौल
D.	ध्वनि
Answer» B. डेसिबल

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