निम्न द्रव्यों में से ध्वन – McqOptions

MCQOPTIONS

1.	निम्न द्रव्यों में से ध्वनि सबसे तेज यात्रा करती हैं -
A.	स्टील में
B.	निर्वात में
C.	वायु में
D.	जल में
Answer» B. निर्वात में

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