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9th Class Science Sample Paper Science Olympiad Model Test Paper-5

  • question_answer
    A man standing 50 m away from a high wall fires a gun. Calculate the time after which an echo is heard, (take speed of sound in air is 320 m/s).

    A) 2 s

    B) 3.2 s

    C) 0.3125 s

    D) 0.1

    E) None of these

    Correct Answer: C

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