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Water coming out of the mouth of a tap and falling vertically in streamline flow forms a tapering column, i.e., the area of cross-section of the liquid column decreases as it moves down. Which of the following is the most accurate explanation for this ? .

Answer» <html><body><p>As the water down, its speed increases and hence its pressure decreases. It is then compressed by the atmosphere.<br/>Falling water <a href="https://interviewquestions.tuteehub.com/tag/tries-3232458" style="font-weight:bold;" target="_blank" title="Click to know more about TRIES">TRIES</a> to reach a terminal velocity and hence <a href="https://interviewquestions.tuteehub.com/tag/reduces-621012" style="font-weight:bold;" target="_blank" title="Click to know more about REDUCES">REDUCES</a> the area of cross-section to balance upward and downward forces.<br/>The mass of water flowing past any cross-section must remain <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a>. Also, water is almost incompressible. Hence, the rate volume flow must remain constant. As this is equal to velocity `xx` area, the area decrease as velocity increases.<br/>The <a href="https://interviewquestions.tuteehub.com/tag/surface-1235573" style="font-weight:bold;" target="_blank" title="Click to know more about SURFACE">SURFACE</a> tension causes the <a href="https://interviewquestions.tuteehub.com/tag/exposed-7260805" style="font-weight:bold;" target="_blank" title="Click to know more about EXPOSED">EXPOSED</a> surface area of the liquid to decrease continuosly.</p>Answer :C</body></html>


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