Question
Water flows in a continuous stream down a vertical pipe, whereas it breaks into drops when falling freely because of(A) Viscosity(B) Surface tension(C) Atmospheric pressure(D) Hydrostatic pressure
Step 1
This can be represented as: \[ \text{Liquid} \xrightarrow{\text{Surface tension}} \text{Minimize surface area} \] Show more…
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Water flowing out of the mouth of a tap and falling vertically in streamline flow forms a tapering column, Le., 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? (a) Falling water tries to reach a terminal velocity and hence, reduces the area of cross-section to balance upwand and downward forces (b) As the water moves down, its speed increases and hence, its pressure decreases. It is then compressed by atmosphere (c) The surface tension causes the exposed surface area of the liquid to decrease continuously (d) The mass of water flowing out per second through any cross-section must remain constant. As the water is almost incompressible, so the volume of water flowing out per second must remain constant. As this is equal to velocity $x$ area, the area decreases as velocity increases
Properties of Liquids
Round 1
A stream of water flowing from a tap becomes namower as it falls, this can be cxplained by (a) viscosity (b) surface tension (c) conservation of encrgy (d) conscrvation of volume llux
Solids and Fluids
Section B
Assertion: When an ideal fluid flows through a horizontal tube of variable cross-section, the pressure becomes different at different points. Reason: Raindrops falling from a great height reach the ground with a relatively small velocity. This phenomenon involves the viscosity of air. (A) $\mathrm{A}$ (B) $\mathrm{B}$ (C) $\mathrm{C}$ (D) D
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