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 (D)</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 (B)</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 (C)</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 (C)</p> Signup and view all the answers

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

<p>$\sigma \times 2L$ (A)</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 (D)</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 (B)</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>$p = \frac{\sigma \times 2L}{L \times d}$ (C)</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>$9.6 N/cm²$ (C)</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 (C)</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 (C)</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 (B)</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 (C)</p> Signup and view all the answers

What is the main factor affecting capillarity?

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

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