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  3. 9th Class
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9th Class Science Sample Paper Science Olympiad Model Test Paper-1

  • question_answer
    A man standing between two walls hears two successive echoes at 2s and 3s. Calculate the distance between the walls, (speed of sound in air\[=340m/s\])

    A)  510 m 

    B)  340 m

    C)  490 m 

    D)  850 m

    E)  None of these

    Correct Answer: D

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