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Class 11 Physics Chapter 10 Mechanical Properties of Fluids Notes

Class 11 Physics Chapter 10 Mechanical Properties of Fluids Notes

Chapter 10 Mechanical Properties of Fluids

Chapter 10 of Class 11 Physics deals with the properties that fundamentally distinguish liquids and gases from solids. In order to properly understand this chapter, students must solve the problems within the chapter and those in the exercises at the back. Vidyakul has compiled the Class 11 Physics Chapter 10 NCERT notes to make this process easy.

CBSE Class 11 Physics Chapter 10 talks about Bernoulli’s Principle, Reynolds Number, Viscosity, Surface Tension, Streamline Flow, and many important topics. Keep reading to know Class 11 Physics Chapter 10 NCERT notes.



Points to Remember

Some important points of Class 11 Physics Chapter 10 are provided below for quick reference for students. Students can refer to them during final exam preparation.

  • Pascal’s law: States that the pressure applied to an enclosed liquid is transmitted undiminished to every portion of the liquid and the wall of the container.

  • Archimedes’ principle: States that when a body is immersed partially or entirely in a fluid, it loses its weight, which is equal to the weight of the fluid displaced by the body

  • Law of floatation: A body floats in a liquid if the weight of the liquid displaced by the immersed portion of the body is equal to the weight of the body.

  • Streamline flow: The flow of the fluid is said to be Streamline if, at any given point, the velocity of each passing fluid particle remains constant in time

  • Turbulent flow: The flow of fluid in which the velocity of all particles crossing a given point is not the same and the motion of the fluid becomes irregular is called turbulent flow.

  • Critical velocity: The maximum velocity of the liquid or fluid up to which its flow is streamlined is called critical velocity. The flow of fluid becomes turbulent if the velocity of flow is more than the critical velocity.

  • Viscosity: The property of a liquid (or fluid) by virtue of which an opposing force comes into play between different layers of the liquid whenever there is a relative motion between these layers is called viscosity.

  • Surface energy (E) is defined as the potential energy of the molecules at the free surface of the liquid. Surface energy per unit area magnitude is equal to surface tension.

Topics and Sub- topics

The mechanical properties of liquids are one of the most exciting and important topics in 11th-grade physics. It teaches the most valuable concepts of physics. Students should watch the chapter concept video prior to solving the problem to get a clear idea of ​​the problem solving approach.

Vidyakul provides notes to each question in the Year 11 Chapter 10 Physics textbook, taking into account the latest programs. Students can access the solution for free and practice to get the highest score on the final exam. 

Students can refer to the topics present in Chapter 10 Physics as mentioned below:


Topic Name


Mechanical Properties of Fluids


Pressure Inside a Fluid


Pascal’s Law


Atmospheric Pressure and Gauge Pressure


Hydraulic Machines


Archimedes’ Principle


Fluid Mechanics


Streamline Flow


Bernoulli’s Principle and Its Applications


Viscosity and Coefficient of Viscosity


Stokes Law


Critical Velocity and Reynolds Number


Surface Tension

Few Important Questions

  • What is meant by ‘Laminar flow’?

A laminar type of flow is when a fluid (gas or liquid) flows in a smooth pattern (regular path).

  • What are some of the uses of ‘Hydrostatic pressure’?

1. Measure blood pressure 2. Proper lung inflation

  • What is the use of ‘Surface tension’?

1. Responsible for the shape of liquid droplets 2. improve the quality of the products 3. plays a part in our body’s ability to transport materials

Practice Questions

  1. Explain why

  • (a) The blood pressure in humans is greater at the feet than at the brain

  • (b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km

  • (c) Hydrostatic pressure is a scalar quantity even though the pressure is force divided by area.

  1. 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.)

  • (c) The surface tension of a liquid is independent of the area of the surface

  • (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 Students can check out some of the important chapter topics below;

    • Pressure

    • Viscosity

    • Streamline Flow

    • Surface Energy

    • Surface Tension

    • Atmospheric Pressure and Gauge Pressure

    • Pressure in Bubbles, Drop and Capillary Rise

    • Bernoulli’s Principle

    • Reynold’s Number

    • Hydraulic Machines

    • Pascal’s Law

Learn more about the same in Class 11 Physics Chapter 10 Mechanical Properties of Fluids Notes pdf.

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