Surface Tension on Liquid Droplet Quiz
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Questions and Answers

What is the definition of surface tension?

  • The tensile force acting on the surface of a liquid in contact with a gas (correct)
  • The force applied to stretch a liquid
  • The pressure acting on the surface of a liquid
  • The resistance of a liquid to deformation

    • What is the unit of measurement for surface tension in SI units?

  • Joules
  • Pa
  • N/m (correct)
  • N/cm²

    • Why do molecules near the free surface of a liquid experience unbalanced forces?

  • Due to a lack of attractive forces from neighboring molecules
  • Because of the upward and downward forces acting on them (correct)
  • As a result of capillarity effects
  • Because the pressure at the free surface is lower

    • How do molecules located at the free surface of a liquid behave?

    <p>Experience downward forces</p> Signup and view all the answers

    What is the phenomenon that explains the liquid's free surface acting as an elastic membrane under tension?

    <p>Surface tension</p> Signup and view all the answers

    In what direction do all molecules on the free surface of a liquid experience a force?

    <p>Downward</p> Signup and view all the answers

    What is the phenomenon of the rise or fall of a liquid surface in a small tube relative to the adjacent general level of liquid called?

    <p>Capillarity</p> Signup and view all the answers

    In the equilibrium of a semi jet, which formula represents the force due to surface tension?

    <p>$\sigma \times 2L$</p> Signup and view all the answers

    If the surface tension of water is 0.0725 N/m and the pressure inside a droplet of water is 0.02 N/cm² greater than the outside pressure, what is the diameter of the droplet?

    <p>1 mm</p> Signup and view all the answers

    What happens when a liquid surface rises in a small tube held vertically in the liquid?

    <p>Capillary rise</p> Signup and view all the answers

    In the context of liquid jet forces, what is equated to calculate the pressure inside the liquid jet?

    <p>$p = \frac{\sigma \times 2L}{L \times d}$</p> Signup and view all the answers

    If the pressure outside a water droplet of diameter 0.04 m is 10.32 N/cm² and the surface tension is 0.0725 N/m, what is the pressure within the droplet?

    <p>$9.6 N/cm²$</p> Signup and view all the answers

    What causes the pressure intensity inside a liquid droplet to increase as its diameter decreases?

    <p>Increase in tensile force due to surface tension</p> Signup and view all the answers

    What is the primary force acting on a hollow bubble like a soap bubble?

    <p>Tensile force due to surface tension</p> Signup and view all the answers

    What happens to the pressure intensity inside a liquid jet as its length increases?

    <p>Pressure intensity decreases</p> Signup and view all the answers

    What is the condition for equilibrium in a liquid droplet cut into two halves?

    <p>Tensile force due to surface tension and pressure force are equal in magnitude and opposite in direction</p> Signup and view all the answers

    What is the main factor affecting capillarity?

    <p>Surface tension of the liquid</p> Signup and view all the answers

    What is the relationship between surface tension and the pressure difference across a curved surface?

    <p>They are directly proportional</p> Signup and view all the answers

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