लगभग 20 डिग्री के तापक्रम पर – McqOptions

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1.	लगभग 20 डिग्री के तापक्रम पर किस माध्यम में ध्वनि की गति अधिकतम रहेगी -
A.	हवा
B.	ग्रेनाइट
C.	लोहा
D.	पानी
Answer» D. पानी

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