General Science- Pratidhwani Ka Karan Hai ?

Q.10455: प्रतिध्वनि का कारण है ?
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प्रतिध्वनि का कारण है ? - What is the cause of resonance? - Pratidhwani Ka Karan Hai ? General Science in hindi,   Dhwani Ka Apvartan question answers in hindi pdf  Dhwani Ka Awshoshan questions in hindi, Know About Dhwani Ka Paravartan General Science online test General Science notes in hindi quiz book    Dhwani Ki Chaal