Practice Angle of Contact - 9.6.3 | 9. MECHANICAL PROPERTIES OF FLUIDS | CBSE 11 Physics Part 2
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Knowledge

9.6.3 - Angle of Contact

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Define the angle of contact.

💡 Hint: Think about the interaction between liquid and solid at their boundary.

Question 2

Easy

What happens when water is spilled on glass?

💡 Hint: Consider the behavior of the liquid on the surface.

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 the angle of contact?

  • Angle between solid and liquid surface
  • Angle between liquid surface and tangent
  • Angle between solid surface and air

💡 Hint: Focus on the definition provided regarding the interaction.

Question 2

True or False: A high contact angle indicates good wetting of surfaces.

  • True
  • False

💡 Hint: Recall the definition of wetting related to the contact angle.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Analyze how changing the surface material from plastic to glass affects the contact angle of water. Given the interfacial tensions, calculate the new angle of contact if the tensions are Sla = 0.0727 N/m, Ssa = 0.030 N/m, and Ssl needs to be determined.

💡 Hint: Refer back to the established relationship for interfacial tensions.

Question 2

A laboratory experiment shows that a new polymer reduces the contact angle of water on a surface from 90 degrees to 45 degrees. Calculate the change in wettability and provide a physical explanation for this phenomenon.

💡 Hint: Consider how the properties change the attraction between water molecules and the surface.

Challenge and get performance evaluation