# IIT JEE Main Physics Study Materials Chapter Wise

### JEE Main 2021 Physics Syllabus

Physics is one of the major sections of JEE Main syllabus 2021. Students have to answer around 25 questions carrying 4 marks each. JEE Main syllabus for Physics comprises topics like Kinematics, Optics, Laws Of Motion, Rotational Motion, Gravitation, Properties Of Solids And Liquids etc. Last year, the highest weightage in Physics was given to topics like current electricity, alternating current, Rotational dynamics, Modern Physics etc. The JEE Main Physics syllabus includes two sections A and B. Section A includes Theory part with 80% weightage and section B contains practical component (experimental skills) with 20% weightage. Check out the full syllabus JEE Main January 2021 Paper 1 Syllabus for Physics below.

### Topics

Unit 1: Physics And Measurement
• Physics, technology and society, S I units, Fundamental and derived units
• Least count, accuracy and precision of measuring instruments,
• Errors in measurement,
• Dimensions of Physical quantities, dimensional analysis and its applications
Unit 2: Kinematics
• Frame of reference
• Motion in a straight line: Position-time graph, speed and velocity
• Uniform and non-uniform motion, average speed and instantaneous velocity
• Uniformly accelerated motion, velocity-time, position-time graphs, relations for uniformly accelerated motion.
• Scalars and Vectors, Vector addition and Subtraction, Zero Vector, Scalar and Vector products, Unit Vector, Resolution of a Vector
• Relative Velocity, Motion in a plane, Projectile Motion, Uniform Circular Motion
Unit 3: Laws Of Motion
• Force and Inertia,
• Newton’s First Law of motion; Momentum, Newton’s Second Law of motion; Impulse; Newton’s Third Law of motion.
• Law of conservation of linear momentum and its applications, Equilibrium of concurrent forces.
Static and Kinetic friction, laws of friction, rolling friction
Dynamics of uniform circular motion: Centripetal force and its applications.
Unit 4: Work, Energy And PowerWork done by a constant force and a variable force; kinetic and potential energies, work energy theorem, power.
Potential energy of a spring, conservation of mechanical energy, conservative and non-conservative forces; Elastic and inelastic collisions in one and two dimensions.
Unit 5: Rotational Motion
• Centre of mass of a two-particle system, Centre of mass of a rigid body; Basic concepts of rotational motion; moment of a force, torque, angular momentum, conservation of angular momentum and its applications; moment of inertia, radius of gyration.
• Values of moments of inertia for simple geometrical objects, parallel and perpendicular axes theorems and their applications.
• Rigid body rotation, equations of rotational motion.
Unit 6: Gravitation
• The universal law of gravitation.
• Acceleration due to gravity and its variation with altitude and depth.
• Kepler’s laws of planetary motion.
• Gravitational potential energy; gravitational potential.
• Escape velocity.
• Orbital velocity of a satellite. Geo-stationary satellites.
Unit 7: Properties Of Solids And Liquids
• Elastic behaviour, Stress-strain relationship, Hooke’s Law, Young’s modulus, bulk modulus, modulus of rigidity.
• Pressure due to a fluid column; Pascal’s law and its applications.
• Viscosity, Stokes’ law, terminal velocity, streamline and turbulent flow, Reynolds number. Bernoulli’s principle and its applications.
• Surface energy and surface tension, angle of contact, application of surface tension – drops, bubbles and capillary rise.
• Heat, temperature, thermal expansion; specific heat capacity, calorimetry; change of state, latent heat.
• Heat transfer-conduction, convection and radiation, Newton’s law of cooling.
Unit 8: Thermodynamics
• Thermal equilibrium, zeroth law of thermodynamics, concept of temperature.
• Heat, work and internal energy.
• First law of thermodynamics.
• Second law of thermodynamics: reversible and irreversible processes.
• Carnot engine and its efficiency.
Unit 9: Kinetic Theory Of Gases
• Equation of state of a perfect gas, work done on compressing a gas.
• Kinetic theory of gases – assumptions, concept of pressure.
• Kinetic energy and temperature: rms speed of gas molecules; Degrees of freedom, Law of equipartition of energy, applications to specific heat capacities of gases; Mean free path, Avogadro’s number.
Unit 10: Oscillations And WavesPeriodic motion – period, frequency, displacement as a function of time. Periodic functions. Simple harmonic motion (S.H.M.) and its equation; phase; oscillations of a spring -restoring force and force constant; energy in S.H.M. – kinetic and potential energies; Simple pendulum – derivation of expression for its time period; Free, forced and damped oscillations, resonance
Wave motion. Longitudinal and transverse waves, speed of a wave. Displacement relation for a progressive wave. Principle of superposition of waves, reflection of waves, Standing waves in strings and organ pipes, fundamental mode and harmonics, Beats, Doppler effect in sound
Unit 11: ElectrostaticsElectric charges: Conservation of charge, Coulomb’s law-forces between two point charges, forces between multiple charges; superposition principle and continuous charge distribution.

Electric field: Electric field due to a point charge, Electric field lines, Electric dipole, Electric field due to a dipole, Torque on a dipole in a uniform electric field.

-Electric flux, Gauss’s law and its applications to find field due to infinitely long uniformly charged straight wire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell. Electric potential and its calculation for a point charge, electric dipole and system of charges; Equipotential surfaces, Electrical potential energy of a system of two point charges in an electrostatic field.

-Conductors and insulators, Dielectrics and electric polarization, capacitor, combination of capacitors in series and in parallel, capacitance of a parallel plate capacitor with and without dielectric medium between the plates, Energy stored in a capacitor.

Unit 12: Currrent Electricity
• Electric current, Drift velocity, Ohm’s law, Electrical resistance, Resistances of different materials, V-I characteristics of Ohmic and nonohmic conductors, Electrical energy and power, Electrical resistivity, Colour code for resistors; Series and parallel combinations of resistors; Temperature dependence of resistance.
• Electric Cell and its Internal resistance, potential difference and emf of a cell, combination of cells in series and in parallel.
• Kirchhoff’s laws and their applications.
• Wheatstone bridge, Metre bridge.
• Potentiometer – principle and its applications.
Unit 13: Magnetic Effects Of Current And Magnetism
• Biot – Savart law and its application to current carrying circular loop. Ampere’s law and its applications to infinitely long current carrying straight wire and solenoid. Force on a moving charge in uniform magnetic and electric fields. Cyclotron.
• Force on a current-carrying conductor in a uniform magnetic field. Force between two parallel current-carrying conductors-definition of ampere. Torque experienced by a current loop in uniform magnetic field; Moving coil galvanometer, its current sensitivity and conversion to ammeter and voltmeter.
• Current loop as a magnetic dipole and its magnetic dipole moment. Bar magnet as an equivalent solenoid, magnetic field lines; Earth’s magnetic field and magnetic elements. Para-, dia- and ferro- magnetic substances.
• Magnetic susceptibility and permeability, Hysteresis, Electromagnets and permanent magnets.
Unit 14: Electromagnetic Induction And Alternating Currents
• Electromagnetic induction; Faraday’s law, induced emf and current; Lenz’s Law, Eddy currents.
• Self and mutual inductance.
• Alternating currents, peak and rms value of alternating current/ voltage; reactance and impedance; LCR series circuit, resonance; Quality factor, power in AC circuits, wattless current.
• AC generator and transformer.
Unit 15: Electromagnetic Waves
• Electromagnetic waves and their characteristics. Transverse nature of electromagnetic waves.
• Electromagnetic spectrum (radio waves, microwaves, infrared, visible, ultraviolet, Xrays, gamma rays).
• Applications of e.m. waves.
Unit 16: Optics

Reflection and refraction of light at plane and spherical surfaces, mirror formula, Total internal reflection and its applications, Deviation and Dispersion of light by a prism, Lens Formula, Magnification, Power of a Lens, Combination of thin lenses in contact, Microscope and Astronomical Telescope (reflecting and refracting) and their magnifying powers.

Wave optics

• wavefront and Huygens’ principle, Laws of reflection and refraction using Huygen’s principle. Interference, Young’s double slit experiment and expression for fringe width.
• Diffraction due to a single slit, width of central maximum.
• Resolving power of microscopes and astronomical telescopes, Polarisation, plane polarized light; Brewster’s law, uses of plane polarized light and Polaroids.
Unit 17: Dual Nature Of Matter And radiation
• Photoelectric effect, Hertz and Lenard’s observations; Einstein’s photoelectric equation; particle nature of light.
• Matter waves-wave nature of particle, de Broglie relation.
• Davisson-Germer experiment.
Unit 18: Atoms And Nuclei
• Alpha-particle scattering experiment; Rutherford’s model of atom; Bohr model, energy levels, hydrogen spectrum.
• Composition and size of nucleus, atomic masses, isotopes, isobars; isotones.
• Radioactivity-alpha, beta and gamma particles/rays and their properties; radioactive decay law. Mass-energy relation, mass defect; binding energy per nucleon and its variation with mass number, nuclear fission and fusion.
Unit 19: Electronic Devices
• Semiconductors; semiconductor diode: I-V characteristics in forward and reverse bias; diode as a rectifier; I-V characteristics of LED, photodiode, solar cell and Zener diode; Zener diode as a voltage regulator.
• Junction transistor, transistor action, characteristics of a transistor; transistor as an amplifier (common emitter configuration) and oscillator. Logic gates (OR, AND, NOT, NAND and NOR).
• Transistor as a switch.
Unit 20: Communication Systems
• Propagation of electromagnetic waves in the atmosphere; Sky and space wave propagation,
• Need for modulation,
• Amplitude and Frequency Modulation,
• Bandwidth of signals,
• Bandwidth of Transmission medium,
• Basic Elements of a Communication System (Block Diagram only).

### Best Books for JEE Main Physics

As part of the JEE Main Preparation Tips for Physics, we want you to get a strong grip on most of the topics in Physics and for that the following books can be used for reference and further study. List of books

 S.No Name of the book Author Description 1. Concepts of Physics H C Verma The book is useful for Mechanics, Electrostatics, Optics, Modern Physics, Heat and waves and it contains good quality of solved numerical problems. 2. Problems in General Physics I.E. Irodov This book contains high level of problems and is good for modern physics, mechanics, electricity and mechanism 3. Arihant Physics D. C. Pandey It consists of solved problems 4. Elements of Dynamics S.L.Loney Check this book for better understanding 5. Advanced level Physics Nelson and Parker Good for JEE Main & Advanced also 6. NCERT Physics Text Books for Basics Class XI and Class XII books for CBSE 7. University Physics Sears and Zemansky It consists of good numerical problems. 8 Fundamentals of Physics Resnick, Halliday, Walker This book is good for electricity and magnetism, heat, mechanics

### JEE Main Topicwise Weightage for Physics

Below is the previous years JEE Main physics topics, number of questions asked and marks distribution in the exam.

TopicsNo of QuestionsMarksWeightage
Electrostatics143.33%
Current Electricity31210.00%
Capacitor143.33%
Magnetic Effect of Current & Magnetism286.67%
Alternating Current286.67%
KTG & Thermodynamics286.67%
SHM143.33%
Sound Waves143.33%
KInematics143.33%
Work Power Energy143.33%
Kinematics143.33%
Laws of motion143.33%
Work,Power and Energy146.67%
Centre Of Mass286.67%
Rotational Dynamics286.67%
Modern Physics286.67%
NLM143.33%
Elasticity143.33%
Wave Optics286.67%
Error143.33%
Circular Motion143.33%
Electromagnetic Waves143.33%
Semiconductors143.33%
Communication System143.33%
Total30120100%
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