- Online Gurukul

JEE Main Physics Important Chapters 2025

Posted On By user

Cracking JEE Main is a dream for countless aspiring engineers in India. Physics, a cornerstone of the exam, can make or break your score. But with a vast syllabus, prioritizing the most crucial chapters becomes paramount. This blog serves as your guide, meticulously outlining the essential chapters for JEE Main Physics and providing a comprehensive overview of each.

Understanding Weightage and Approach

The weightage for each chapter in JEE Main Physics fluctuates slightly year-to-year. However, some chapters consistently hold a significant portion of the exam. Focusing on these high-weightage areas first builds a strong foundation and maximizes your score potential. Remember, a well-rounded understanding is still crucial. Don’t neglect seemingly less important chapters entirely.

Here’s a recommended approach:

  1. Master the High-Weightage Chapters: Deeply understand these core concepts.
  2. Solidify Your Foundation: Revise and practice problems from NCERT textbooks.
  3. Expand Your Horizons: Explore advanced concepts from reference materials.
  4. Practice Makes Perfect: Regularly solve past year JEE Main papers and mock tests.

High-Weightage Chapters

Now, let’s delve into the heart of the matter: the most important chapters for JEE Main Physics. Buckle up for a detailed exploration of each chapter, its key concepts, and its significance in the exam.

1. Mechanics

Mechanics, encompassing the fundamental laws of motion and their applications, forms the bedrock of Physics. Here are the crucial sub-topics within Mechanics:

  • Laws of Motion: Understand Newton’s three laws of motion, their mathematical formulations, and applications to various scenarios involving linear and rotational motion.
  • Work, Power, and Energy: Grasp the concepts of work done, power, kinetic energy, potential energy, and the law of conservation of mechanical energy.
  • Center of Mass and Momentum: Master the concepts of center of mass, linear momentum, and their conservation laws.
  • Friction: Explore different types of friction (static and kinetic), their coefficients, and their applications in real-world problems.
  • Circular Motion: Comprehend the concepts of centripetal force, centripetal acceleration, and their applications in situations like uniform circular motion.
  • Projectile Motion: Analyze the motion of projectiles launched at various angles, considering factors like time of flight, maximum height reached, and horizontal range.
  • Collision Theory: Understand the different types of collisions (elastic and inelastic) and apply the laws of conservation of momentum and kinetic energy during collisions.
  • Rotational Motion: Grasp the concepts of angular displacement, angular velocity, angular acceleration, moment of inertia, and their applications in analyzing the rotational motion of rigid bodies.

Significance in JEE Main: Mechanics consistently holds a high weightage in JEE Main, often exceeding 20% of the total marks. A strong foundation in these concepts is essential for tackling problems in other areas of Physics as well.

2. Thermodynamics

Thermodynamics deals with the relationship between heat, work, temperature, and energy in a system. Here are the important sub-topics:

  • First Law of Thermodynamics: Understand the law of conservation of energy and its application to thermodynamic systems.
  • Second Law of Thermodynamics: Explore entropy, its concept of increasing disorder, and its role in spontaneous processes.
  • Heat Transfer: Master the mechanisms of heat transfer (conduction, convection, and radiation) and their applications in various scenarios.
  • Ideal Gas Laws: Grasp the behavior of ideal gases using Boyle’s Law, Charles’ Law, Gay-Lussac’s Law, and the combined gas law.
  • Thermodynamic Processes: Analyze different thermodynamic processes (isothermal, adiabatic, isobaric, and isochoric) and their implications on pressure, volume, and temperature.
  • Carnot Engine: Understand the working principle of a Carnot engine and its efficiency as a theoretical limit for heat engines.

Significance in JEE Main: Thermodynamics holds a significant weightage in JEE Main, typically ranging between 10% and 15% of the total marks. Mastering these concepts is crucial for solving problems related to heat engines, refrigeration cycles, and other applications.

3. Oscillations and Waves

This chapter explores periodic and wave phenomena, with numerous applications in various fields. Here’s a breakdown of the key sub-topics:

  • Simple Harmonic Motion (SHM): Understand the concept of SHM, its mathematical representation using simple harmonic oscillators, and its applications in various systems like pendulums and springs.
  • Superposition of Waves: Grasp the principle of superposition and its role in analyzing the behavior of interfering waves.
  • Progressive Waves: Analyze the properties of progressive waves such as wavelength, frequency, wave speed, and their relationships. Solve problems related to wave propagation and energy transfer.
  • Standing Waves: Understand the formation of standing waves, their nodes and antinodes, and their applications in musical instruments.
  • Doppler Effect: Explore the Doppler effect, its explanation for the change in frequency of a wave perceived by an observer relative to the source, and its applications in various scenarios like sound waves and light waves.

Significance in JEE Main: Oscillations and Waves hold a weightage of around 10-15% in JEE Main. A strong understanding of these concepts is crucial for tackling problems related to sound waves, light waves, and their applications in acoustics and optics.

4. Electrostatics

Electrostatics deals with the properties and interactions of electric charges at rest. Here are the fundamental sub-topics:

  • Electric Charge and Field: Understand the concepts of electric charge, its types, and the electric field generated by a point charge.
  • Gauss’s Law: Grasp Gauss’s law and its application in calculating the electric flux through a closed surface and relating it to the enclosed charge.
  • Electric Potential and Potential Difference: Master the concepts of electric potential, potential difference, equipotential lines, and their relationship with the electric field.
  • Capacitance: Understand capacitance, its dependence on geometrical factors, and analyze capacitors in series and parallel combinations.
  • Dielectrics: Explore the behavior of dielectrics in an electric field, their permittivity, and their effect on capacitance.

Significance in JEE Main: Electrostatics consistently holds a significant weightage, often exceeding 15% of the total marks in JEE Main. Mastering these concepts is crucial for understanding electric circuits, capacitors, and various electrical phenomena.

5. Current Electricity

Current Electricity explores the flow of electric charges and its associated effects. Here are the key sub-topics to focus on:

  • Electric Current: Understand the concept of electric current, its measurement using ammeters, and Ohm’s Law for relating current, voltage, and resistance.
  • Circuits: Analyze electric circuits with resistors in series and parallel combinations, Kirchhoff’s current and voltage laws, and solve problems related to potential difference and current distribution.
  • Magnetic Field due to Current: Explore how moving charges create a magnetic field around them and understand the Biot-Savart Law for calculating the magnetic field produced by a current-carrying conductor.
  • Electromagnetic Induction: Grasp the concept of electromagnetic induction, Faraday’s Law of electromagnetic induction, and its applications in generators and transformers.

Significance in JEE Main: Current Electricity holds a weightage of around 10-15% in JEE Main. Understanding these concepts is essential for solving problems related to circuits, electrical appliances, and electromagnetic devices.

6. Magnetism

Magnetism deals with the properties and interactions of magnets and magnetic fields. Here are the important sub-topics:

  • Properties of Magnets: Understand the basic properties of magnets, magnetic poles, their attraction and repulsion, and the concept of magnetic field lines.
  • Earth’s Magnetism: Explore the Earth’s magnetic field, its importance in navigation, and the concept of magnetic declination and inclination.
  • Moving Charges and Magnetism: Analyze the force experienced by a moving charge in a magnetic field and its applications in various devices like motors and cyclotrons.
  • Magnetization of Materials: Understand the different types of magnetic materials (diamagnetic, paramagnetic, ferromagnetic), their behavior in a magnetic field, and their applications.

Significance in JEE Main: Magnetism typically holds a weightage of around 5-10% in JEE Main. Although the weightage might be lower compared to other chapters, a strong understanding of magnetism is crucial for comprehending electromagnetic phenomena and their applications.

7. Optics

Optics explores the behavior and properties of light. Here are the key areas to focus on:

  • Ray Optics: Understand the laws of reflection and refraction, their application to mirrors and lenses, and solve problems related to image formation.
  • Wave Optics: Explore the wave nature of light, interference, diffraction, and their applications in phenomena like phenomena like Young’s double-slit experiment and diffraction gratings.
  • Polarization: Understand the concept of polarization of light, its different types, and its applications in various optical instruments like polaroid sunglasses.

Significance in JEE Main: Optics holds a weightage of around 10-15% in JEE Main. Mastering these concepts is crucial for solving problems related to lenses, mirrors, optical instruments, and the wave nature of light.

8. Modern Physics

Modern Physics delves into the world of atomic and nuclear phenomena, forming the foundation for advancements in various fields. Here are the key sub-topics:

  • Atomic Structure: Understand the Bohr model of the atom, its limitations, and the concept of atomic orbitals.
  • Nuclear Physics: Explore the structure of the nucleus, its constituents (protons and neutrons), and nuclear reactions like fission and fusion.
  • Radioactivity: Grasp the concept of radioactivity, its different types (alpha, beta, and gamma decay), and applications in areas like medicine and power generation.
  • Photoelectric Effect: Understand the photoelectric effect, its explanation based on the quantization of light, and its applications in photocells.
  • Lasers: Explore the working principle of lasers, stimulated emission of radiation, and their applications in various fields like communication and medicine.

Significance in JEE Main: Modern Physics holds a weightage of around 5-10% in JEE Main. While the weightage might be lower, understanding these concepts lays the groundwork for further exploration in physics and related fields of engineering.

Beyond the High-Weightage Chapters

While focusing on the high-weightage chapters is crucial, don’t neglect other areas of the JEE Main Physics syllabus entirely. Here’s why:

  • Well-Rounded Knowledge: A comprehensive understanding strengthens your foundation and aids in tackling problems that might combine concepts from various chapters.
  • Unexpected Questions: The weightage for specific chapters can fluctuate slightly year-to-year. Being prepared for a wider range of topics allows you to adapt to the exam pattern.
  • Building Confidence: Mastering a diverse range of topics boosts your confidence and helps you approach the exam with a more positive mindset.

Remember: Consistency is key. Regularly revise concepts, practice solving problems from various sources, and analyze your strengths and weaknesses to identify areas that require further attention.

Additional Tips for JEE Main Physics Success

  1. Embrace NCERT Textbooks: NCERT Physics textbooks form the bedrock of your preparation. Ensure a thorough understanding of the concepts and solved examples within them.
  2. Reference Materials: Supplement your learning with reference materials and solved question banks from reputed publishers. These resources offer a wider range of problems and in-depth explanations.
  3. Practice Makes Perfect: Regularly solve past year JEE Main papers and mock tests under timed conditions. This simulates the exam environment and helps you develop time management skills and exam temperament.
  4. Seek Guidance: Don’t hesitate to seek help from teachers, mentors, or online resources when you encounter challenging concepts. A clear understanding is crucial for success.


Conquering JEE Main Physics requires dedication, strategic planning, and a focus on the most important chapters. By following the guidance outlined in this blog, diligently practicing, and continuously expanding your knowledge base, you can significantly increase your chances of achieving a stellar score and taking a significant step towards your engineering dream.

The founders of PracBee are senior IITians, passionate about education in India and ensuring high performance of students.

Contact us