General Science- Jab Dhwani Tarangein Chalti Hain , To Apne Sath Le Jati Hai ?

Q.10456: जब ध्वनि तरंगें चलती हैं , तो अपने साथ ले जाती है ?
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जब ध्वनि तरंगें चलती हैं , तो अपने साथ ले जाती है ? - When the sound waves run, take with you? - Jab Dhwani Tarangein Chalti Hain , To Apne Sath Le Jati Hai ? General Science in hindi,   Dhwani question answers in hindi pdf  Urja questions in hindi, Know About Dravyamaan General Science online test General Science notes in hindi quiz book    Vibhavantar