NCERT Textbook Class 11 Physics 2026-27 | Download PDF

NCERT Class 11 Physics textbook continues to be the most reliable resource for building a strong base in Physics for the academic session 2026-27. Developed by NCERT and aligned with CBSE guidelines, the book emphasizes conceptual understanding and application-based learning.

The textbook helps students develop analytical thinking and problem-solving skills. It covers fundamental topics such as mechanics, laws of motion, thermodynamics, waves, and properties of matter.

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NCERT Class 11 Physics Textbook Part I (2026-27) PDF

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NCERT Class 11 Physics Textbook Part II (2026-27) PDF

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Physics Class 11 NCERT Complete Overview 

The NCERT Physics Class 11 book starts with basics like Physical World and Units and Measurements, and builds core understanding through chapters such as Motion, Laws of Motion, and Work, Energy and Power.

It further covers key topics like Gravitation, Thermodynamics, Oscillations, and Waves, helping students develop strong concepts and problem-solving skills for Class 12 and competitive exams like JEE and NEET.

Key Pointers for Physics Class 11 

The NCERT Class 11 Physics book includes several important features that make it an essential study resource:

• Based on the latest CBSE syllabus for 2026–27
• Covers mechanics, thermodynamics, and wave motion
• Focuses on conceptual clarity with numerical problems
• Includes solved examples and exercise questions
• Strengthens foundation for Class 12 and competitive exams

NCERT Physics Textbook for Class 11 Chapters

We have summarised all chapters content below as per the latest CBSE syllabus for Class 11 Physics.

Physics Part I 

• Chapter 1. Units and Measurement: Covers systems of units, measurement techniques, and error analysis in physical quantities.
• Chapter 2. Motion In A Straight Line: Explains one-dimensional motion, displacement, velocity, and acceleration.
• Chapter 3. Motion In A Plane: Introduces two-dimensional motion, vectors, and projectile motion. 
• Chapter 4. Laws of Motion: Discusses Newton’s laws and their applications in understanding forces and motion.
• Chapter 5. Work, Energy and Power: Explains the concepts of work, different forms of energy, and power. 
• Chapter 6. System of Particles and Rotational Motion: Covers centre of mass, rotational dynamics, and angular motion.
• Chapter 7. Gravitation: Explores gravitational force, planetary motion, and satellites. 

Physics Part II

• Chapter 8. Mechanical Properties of Solids: Focuses on elasticity, stress, strain, and deformation of solids. 
• Chapter 9. Mechanical Properties of Fluids: Explains pressure, viscosity, and fluid flow behavior.
• Chapter 10. Thermal Properties of Matter:  Covers heat, temperature, and expansion of materials.
• Chapter 11. Thermodynamics: Discusses laws of thermodynamics and energy transfer processes.
• Chapter 12. Kinetic Theory: Explains the behavior of gases based on molecular motion. 
• Chapter 13. Oscillations: Introduces periodic motion and simple harmonic motion (SHM). 
• Chapter 14. Waves: Covers wave motion, sound waves, and their properties.

Study Resources Physics NCERT Class 11

NCERT Physics provides a balanced combination of theory and numerical application, making it ideal for conceptual learning.

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Class 11 Physics: Topics Deleted 

The latest  NCERT update mentions no changes in NCERT Class 11 Physics syllabus for the academic session 2026-27. Any revisions are expected to be introduced gradually under NEP implementation in future sessions.

NCERT Class 11 Physics: Important Questions

NCERT textbook for Class 11 covers everything related to all the chapters in Physics. Down below there are questions from some of the most important chapters of Physics grade 11. 

Chapter 1: Units and Measurement

Q1.  Explain this statement clearly: “To call a dimensional quantity 'large' or 'small' is meaningless without specifying a standard for comparison”. In view of this, reframe the following statements wherever necessary: 

Ans. The given statement is true because a dimensionless quantity may be large or small, but there should be some standard reference to compare that. For example, the coefficient of friction is dimensionless but we could say that the coefficient of sliding friction is greater than the coefficient of rolling friction, but less than static friction. 

a)   Atoms are very small objects. 

Ans. An atom is very small compared to a soccer ball. 

b) A jet plane moves with great speed 

Ans. A jet plane moves with a speed greater than that of a bicycle. 

c) The mass of Jupiter is very large 

Ans. Mass of Jupiter is very large compared to mass of a cricket ball 

d) The air inside this room contains a large number of molecules 

Ans. The air inside this room contains a large number of molecules as compared to that contained by a geometry box. 

e) A proton is much more massive than an electron 

Ans. A proton is more massive than an electron. 

f) The speed of sound is much smaller than the speed of light. 

Ans. The speed of sound is less than the speed of light. 

Q2. A student measures the thickness of a human hair using a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3.5 mm. Estimate the thickness of hair. 

Ans. We are given that:

Magnification of the microscope = 100 

Average width of the hair in the field of view of the microscope = 3.5 mm 

∴ Actual thickness of the hair would be, 3.5/100 = 0.035 mm. 

Chapter 4: Laws of Motion

Q1. A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial acceleration of 5.0ms^-2. Calculate the initial thrust (force) of the blast. 

Ans.  It is known that, 

Mass of the rocket, m = 20,000kg 

Initial acceleration, a = 5ms^-2

Acceleration due to gravity, g = 10ms^-2

By using Newton’s second law of motion,

The net force (thrust) acting on the rocket can be written as: 

F - mg = ma 

= F = m(g+a)

= F = 20000 (10+5) = 20000*15

= F = 3*10⁵ N

Therefore, the initial thrust (force) of the blast is 3*10⁵ N. 

Q2. A bob of mass 0.1kg hung from the ceiling of a room by a string 2m long is set into oscillation. The speed of the bob at its mean position is the trajectory of the bob if the string is cut when the bob is 

a) at one of its extreme positions,

Ans. If the string is cut when the bob is at one of its extremes then the bob will fall vertically on the ground. Therefore, at the extreme position, the velocity of the bob becomes zero.

b) at its mean position. 

Ans. If the string is cut when the bob is at its mean position then the bob will trace a projectile path having the horizontal components of velocity only. The direction of this velocity is tangential to the arc formed by the oscillating bob. At the mean position, the velocity of the bob is 1m / s. Therefore, it will follow a parabolic path. 

Chapter 5: Work, Energy and Power

Q1. A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to (i) t^1/2 (ii) t (iii) t^3/2 (iv) t²

Ans. It is given that the body is accelerated with a constant value -a hence the corresponding force experienced is F = ma.

Let’s say that the initial velocity of the body is u . 

Thus, the velocity -v of the body at any given point in time -t can be written as v-u = at  

And the power is 

P = F.v = (ma)v

= P = ma (at+u) = ma²t + mau 

The mass, acceleration, and initial velocity are constant. 

= P∝ t 

Hence it can be noted that power is linearly dependent on t. 

Chapter 11: Thermodynamics

Q1. An electric heater supplies heat to a system at a rate of 100W . If the system performs work at a rate of 75 Joules per second. At what rate is the internal energy increasing?  

Ans. Given:
Heat supplied per second = 100 W

Work done per second = 75 J/s

Using First Law of Thermodynamics: ΔU = Q − W

Calculation: ΔU = 100 − 75 = 25 J/s

Answer: The internal energy of the system is increasing at a rate of 25 J/s (or 25 W).

Q2. Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock suddenly opened. Answer the following: 

a) What is the final pressure of the gas in A and B? 

b) What is the change in internal energy of the gas? 

c) What is the change in the temperature of the gas? 

d) Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface? 

Ans. Given:
Two equal volume cylinders A and B are connected.
A contains gas at STP, B is vacuum, the system is insulated.

(a) Final Pressure:
When the stopcock is opened, the gas expands to double its initial volume.
Since temperature remains constant (free expansion),

 P₁V₁ = P₂V₂
⇒ P₂ = P₁/2

Final pressure = ½ atm

(b) Change in Internal Energy (ΔU):
For an ideal gas, internal energy depends only on temperature.
Since temperature does not change,

ΔU = 0

(c) Change in Temperature (ΔT):
In free expansion of an ideal gas (no heat exchange, no work done),

ΔT = 0

(d) Intermediate States:
The process is very fast and not quasi-static, so intermediate states are not in equilibrium.

Hence, they do NOT lie on the P–V–T surface.

Tips for Effective Preparation for Class 11 Physics 

1. NCERT Line-by-Line & Example First Approach

Don’t jump to extra books. First, read NCERT theory carefully and solve all solved examples before exercises, many exam questions are directly inspired from them.

2. Build a Formula & Concept Sheet

Instead of only formulas, write: formula + meaning + when to use it.

3. Numericals are more scoring than Theory 

Spend 70% time solving numericals, especially from chapters like Laws of Motion, Work Energy Power, and Rotational Motion, these are scoring but practice-heavy.

4. Derivations meaning Easy Marks

Focus on derivations like:

• Equations of motion
• Work-energy theorem
• Moment of inertia

These are often asked directly or indirectly.

5. Fix Weak Chapters Early

If Rotational Motion or Thermodynamics feels tough, fix it immediately, these chapters stack concepts and become harder later.

6. Mistake Notebook

Maintain a separate notebook for:

• Wrong numericals
• Concept mistakes
• Silly calculation errors
• Revise this weekly - it boosts scores fast.

7. Graphs & Visual Understanding

Chapters like Motion in a Straight Line and Waves are heavily graph-based—practice interpreting graphs, not just solving formulas.

8. NCERT Back Exercise,  Must-Do (No Skipping)

Before any reference book, complete all NCERT exercise questions, CBSE papers often follow the same pattern.

FAQs

Q1. Which are the most important chapters in Class 11 Physics?

Ans. Chapters like Laws of Motion, Work Energy Power, Rotational Motion, and Thermodynamics are considered highly important for exams and future studies.

Q2. Is NCERT enough for Class 11 Physics exams?

Ans. Yes, NCERT is sufficient for CBSE exams. However, for competitive exams like JEE, additional practice is recommended.

Q3. Where can I download NCERT Class 11 Physics PDF?

Ans. Students can download the official PDF from the NCERT website or access it through trusted academic websites like Educart. 

Q4. What are common mistakes students make in Physics?

Ans. Common mistakes include skipping derivations, not practicing numericals, and memorizing formulas without understanding concepts.

Q5. Is solving previous year questions important for Physics?

Ans. Yes, it helps in understanding exam patterns and improves problem-solving speed and accuracy.