NCERT solution Class 11 mechanical properties of fluids

NCERT Solutions

Class 11 Physics

Mechanical Properties of Fluids

NCERT Questions

Q.1
Q. 9.2
Q.9.3
Q.9.4
Q.9.5
Q.9.6
Q.9.7
Q.9.8
Q.9.9
Q.9.10
Q.9.11
Q.9.12
Q.9.13
Q.9.14
Q.9.15
Q.9.16
Q.9.17
Q.9.18
Q.9.19
Q.9.20

Q. 9.2

Explain why

(a) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute.

(b) Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (Put differently, water wets glass while mercury does not.)

(d) Water with detergent dissolved in it should have small angles of contact.

(e) A drop of liquid under no external forces is always spherical in shape

The angle between the tangent to the liquid surface at the point of contact and the surface inside the liquid is called the angle of contact (θ), as shown in the given figure.

S_{la =}interfacial tensions between the liquid-air,

S_sainterfacial tensions between the solid-air and

S_sl = interfacial tensions between the liquid-air

At the line of contact, the surface forces between the three media must be in equilibrium, i.e.

cos θ = (S_sa - S_sl)/ (S_la)

The angle of contact θ, is obtuse if S_sa < S_la (as in the case of mercury on glass). This angle is acute if S_sl < S_la (as in the case of water on glass).

Explanation: - Mercury molecules (which make an obtuse angle with glass) have a strong force of attraction between themselves and a weak force of attraction toward solids. Hence, they tend to form drops.
Explanation: - For equilibrium of a liquid drop on the surface of a solid, the equation T_SA = T_SL + T_LA cos θ ... (i) must be true.

For mercury-glass, angle of contact is obtuse. In order to achieve this obtuse value of angle of contact, the mercury tends to form a drop.

Explanation: - Surface tension is the force acting per unit length at the interface between the plane of a liquid and any other surface. This force is independent of the area of the liquid surface. Hence, surface tension is also independent of the area of the liquid surface.

Explanation: - As the cloth has narrow spaces in the form of fine capillaries. The rise of liquid in a capillary tube is given by:-

h = (2Scos (θ).)/ (rρ g);

=> h ∝ cos (θ). It shows that if θ is small, cos θ will be large and as a result detergent raises more in fine capillaries in the cloth.

As detergents having small angles of contact, therefore they can penetrate more, so will remove dirt from the cloth.

(e) Explanation: - In the absence of external forces, only force acting on the liquid drop is due to surface tension. A drop of liquid tends to acquire minimum surface area due to the property of surface tension. Since for a given volume of liquid, surface area is least for a sphere. So the liquid drop will always assume a spherical shape.

Video solution:

Mechanical Properties of Fluids Class 11 Physics NCERT Chapter 9 NCERT Solutions

Solving NCERT textbook questions of Mechanical Properties of Fluids Class 11 Physics NCERT Chapter 9 is a crucial step to gauge your understanding of the concepts. It provides you with an opportunity to assess your grasp of the material after learning each chapter. We have already provided solutions to all the exercises in the NCERT textbook of Class 11 Physics Mechanical Properties of Fluids, available in various formats such as video, text, and downloadable PDFs. If you need assistance with any of the NCERT questions or any other academic topics, feel free to ask in the “Ask Questions” section of LearnoHub.com.

Studying each and every line of the NCERT (National Council of Educational Research and Training) textbook of Mechanical Properties of Fluids Class 11 Physics and solving all the questions it contains can be highly beneficial for several reasons:

Comprehensive Understanding: Class 11 Physics NCERT textbooks are designed by experts to provide a comprehensive understanding of the subject matter. By studying each line of Mechanical Properties of Fluids Class 11 Physics, you ensure that you don't miss any essential information or concepts.
Strong Foundation: NCERT books form the foundation of many academic exams and competitive tests. Mastering these textbooks helps build a solid foundation of knowledge for higher-level studies.
Clarity of Concepts: Solving the questions provided in NCERT textbooks for Mechanical Properties of Fluids Class 11 Physics NCERT Chapter 9 reinforces the concepts learned in each chapter. It helps you apply theoretical knowledge to practical problem-solving scenarios.
Exam Preparation: Many standardized tests, including board exams and entrance exams, extensively rely on NCERT content. Familiarity with the textbook content and practice with its questions can enhance your exam performance.
Common Language: NCERT textbooks use simple and easily understandable language. Mastering the material ensures you are well-versed in the language commonly used in various academic and competitive settings.
Confidence Boost: Successfully solving all the NCERT questions of Mechanical Properties of Fluids Class 11 Physics gives you a sense of accomplishment and boosts your confidence in your knowledge and problem-solving skills.
In-Depth Learning: Delving into each line of the textbook for the chapter Mechanical Properties of Fluids Class 11 Physics helps you gain in-depth knowledge of the subject, making you better prepared to tackle complex problems and real-life situations.
Time Management: By thoroughly studying and solving all the NCERT questions, you develop efficient time management skills, which are crucial during exams when you need to answer questions within a limited time frame.
Holistic Approach: NCERT textbooks usually cover a wide range of topics, providing a holistic understanding of the subject. This approach is essential for a well-rounded education.
Application in Real Life: The concepts and knowledge gained from NCERT textbooks often have practical applications in everyday life, helping you make informed decisions and solve real-world challenges.

In conclusion, studying each line and solving all the questions of NCERT textbooks is an essential part of the learning process. It ensures a strong foundation, deep understanding, and overall academic growth.

How to make the most of NCERT Solutions module of Mechanical Properties of Fluids Class 11 Physics NCERT Chapter 9 on LearnoHub.com?

Using the NCERT solutions module effectively can significantly enhance your learning experience and understanding of the subject matter. Here's a step-by-step guide on how to make the most out of the NCERT solutions:

Attempt to Solve Yourself: Before looking at the solution, try to solve or answer the question independently. This practice will help you test your knowledge and problem-solving skills.
Match with Our Solution: After attempting the question, compare your result and approach with the provided NCERT solution. This step allows you to identify any mistakes or gaps in your understanding.
Refer to Solution Video (if needed): If you encounter difficulty or are unable to solve a question, you can refer to the NCERT solution video on Mechanical Properties of Fluids Class 11 Physics NCERT Chapter 9 to get a step-by-step explanation of the correct approach. Pay attention to the reasoning and methodology used in the video.
Solve Again Yourself: Once you've understood the solution, attempt to solve the question again by yourself. Repetition and practice solidify your understanding of the concepts and improve retention.
Avoid Memorization: Focus on understanding the underlying principles and concepts behind each solution. Avoid simply memorizing the solutions, as this may hinder your ability to apply the knowledge in different contexts.
Attempt All Questions: Make an effort to attempt all the questions provided in the NCERT textbook. This comprehensive practice will help you cover the entire syllabus and reinforce your understanding across various topics. You may refer Class 11 Physics Mechanical Properties of Fluids Online Test on LearnoHub.com.
Review and Revise: Regularly review the concepts and solutions you've learned. Revise your notes and practice regularly to retain the knowledge effectively. You may refer Mechanical Properties of Fluids Class 11 Physics Notes.
Ask for Clarification: If you encounter any doubts or have questions about the solutions, don't hesitate to seek clarification on the “Ask Questions” section of LearnoHub.com. Mechanical Properties of Fluids Class 11 Physics NCERT Chapter 9 Questions.

By following these steps and actively engaging with the NCERT solutions module of Class 11 Physics Mechanical Properties of Fluids NCERT Chapter 9, you can improve your learning outcomes, develop a better grasp of the subject, and perform well in exams and other academic assessments. Remember that consistent practice, understanding, and application of knowledge are key to academic success.

NCERT solutions of Mechanical Properties of Fluids Class 11 Physics - all questions of all exercises are solved. Q. No. 1, 2, 3, and so on. Complete explanation and detailed solution makes them the best videos for Class 11 Physics Mechanical Properties of Fluids NCERT solutions.