Practice Surface Tension - 2.9 | 2. Basics of Fluid Mechanics- 1 (Contnd.) | Hydraulic Engineering - Vol 1
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2.9 - Surface Tension

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Define surface tension.

💡 Hint: Think about how molecules at the surface interact compared to those below.

Question 2

Easy

What happens to surface tension as temperature increases?

💡 Hint: Consider the effect of molecular motion on cohesive forces.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is surface tension?

  • A force that pulls molecules apart
  • A force that binds molecules together
  • A force that maintains the shape of solids

💡 Hint: Think about why water droplets keep a rounded shape.

Question 2

Temperature increases surface tension.

  • True
  • False

💡 Hint: Consider the kinetic theory of matter.

Solve 2 more questions and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Given a liquid with a surface tension of 0.07 N/m and a droplet radius of 0.5 mm, how much force is required to pull two plates apart that are coated with this liquid?

💡 Hint: You'll need to find the area (A) of the coating to continue.

Question 2

If the temperature of a liquid increases from 20°C to 80°C, causing surface tension to drop from 0.07 N/m to 0.045 N/m, calculate the change in pressure difference across a bubble with a radius of 0.3 mm before and after.

💡 Hint: Use the initial and final values for surface tension in the pressure difference calculation.

Challenge and get performance evaluation