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  3. 8th Class
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8th Class Science Sound Question Bank Sound Formative Objective Problems

  • question_answer
    A boy stands 85 m in front of a high wall and then blows a whistle. Calculate the time interval when he hears an echo. (speed of sound = 340 m/s)

    A)  0.5 s              

    B)  5 s

    C)  1.5 s                                     

    D)  2 s

    Correct Answer: A

    Solution :

      Not Available    


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