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    Question

    After rising a short distance the smooth column of smoke

    from a cigarette breaks up into an irregular and random pattern. In a similar fashion, a stream of fluid flowing past an obstacle breaks up into eddies and vortices which give the flow irregular velocity components transverse to the flow direction. Other examples include the wakes left in water by moving ships the sound produced by whistling and by wind instruments. These examples are the results of
    A laminar flow of air Correct Answer Incorrect Answer
    B streamline flow of air Correct Answer Incorrect Answer
    C turbulent flow of air Correct Answer Incorrect Answer
    D viscous flow at low speed Correct Answer Incorrect Answer

    Solution

    Turbulent flow is accompanied by random, irregular, local circular currents called vortices. 

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