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    Question

    Which of the following statements is true about

    sound?  
    A Sound can travel in vacuum Correct Answer Incorrect Answer
    B Sound needs a medium to travel Correct Answer Incorrect Answer
    C Sound travels faster than light Correct Answer Incorrect Answer
    D Sound does not reflect Correct Answer Incorrect Answer

    Solution

    Sound is a mechanical wave, so it needs a medium like air, water, or solids.   It cannot travel in vacuum (like in space).   This is why no sound can be heard in outer space.   Reflection of sound is used in SONAR and echo.

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