Physics Grade XI
About This Course
Physics in Grade XI lays the conceptual foundation for everything you’ll study in Grade XII and beyond, making it one of the most important subjects for science students in the NEB curriculum. This course is built to help you develop a strong grasp of mechanics, heat, optics, and electricity before moving on to the more advanced topics covered in Grade XII.
Course Structure: Five Sections
Mechanics
The largest unit — starts with physical quantities and vectors, then moves through kinematics, dynamics, work-energy-power, circular motion, gravitation, and closes with elasticity. This is the backbone that every later unit builds on.
Heat & Thermodynamics
Covers heat and temperature, thermal expansion, quantity of heat, rate of heat flow, and ideal gases — the thermal physics foundation that Grade XII’s thermodynamics unit builds directly on top of.
Wave & Optics
How light behaves at mirrors, plane surfaces, prisms, and lenses, closing with dispersion — the ray-diagram and refractive-index skills that come up again and again in board exam questions.
Electricity & Magnetism
Starts with electric charges and fields, moves through potential and capacitors, and ends with DC circuits — Ohm’s law, resistivity, and potential dividers. Sets up everything Grade XII’s electromagnetism unit continues.
Modern Physics
Nuclear physics — mass defect, binding energy, fission and fusion — followed by an introduction to solids (semiconductors) and a tour of recent trends: particle physics and the expanding universe.
What You Will Learn
By the end of this course, you’ll have a clear understanding of physical quantities, units, and vector operations, along with the fundamentals of motion, force, energy, circular motion, gravitation, and elasticity. You’ll cover the core thermal physics concepts of heat transfer, thermal expansion, and ideal gas behavior. In optics, you’ll learn how light behaves at mirrors, prisms, and lenses. In electricity and magnetism, you’ll move from electric charges and fields through capacitors to DC circuit analysis. The course closes with an introduction to nuclear physics, semiconductors, and a look at some of the biggest open questions in modern physics.
How to Study This Course Effectively
Understand the reasoning behind each formula. Grade XI introduces many ideas for the first time — memorizing them in isolation won’t hold up once Grade XII builds on top.
Work through numerical problems regularly. Understanding without practice is the most common way marks are lost.
Draw diagrams for mechanics and optics problems. A clear diagram makes half of these problems solve themselves.
Revisit earlier chapters before moving to new ones. Mechanics, optics, and circuits all build cumulatively — gaps early on resurface later.
Take electricity and magnetism seriously. DC circuits lead directly into electromagnetic induction and AC circuits next year — a solid grasp now makes Grade XII considerably easier.
Why Choose NN Education
Simple, exam-focused notes
Written in plain language so foundational concepts stay easy to follow, even for students who find physics challenging at first.
Question banks & numericals
Added progressively across chapters to support regular practice alongside the theory.
Reviewed & kept current
Materials are checked and updated to stay aligned with the current NEB Grade XI syllabus.
Frequently Asked Questions
Is the Grade XI Physics course free?
Selected chapters are available free so you can start learning immediately. Premium chapters and their full study resources are included with the NN Premium subscription at Rs. 250/year.
How many chapters does this course cover?
26 chapters across five sections: Mechanics, Heat & Thermodynamics, Wave & Optics, Electricity & Magnetism, and Modern Physics — covering the full NEB Grade XI Physics syllabus.
Which unit carries the most weight?
Mechanics is the largest unit by chapter count, covering physical quantities, vectors, kinematics, dynamics, work-energy-power, circular motion, gravitation, and elasticity — eight chapters in total.
How does this course connect to Grade XII Physics?
Several Grade XI chapters set up Grade XII topics directly — DC circuits lead into electromagnetic induction and AC circuits, mechanics extends into rotational dynamics, and heat and thermodynamics leads into the first and second laws of thermodynamics.
How should I study this course for the best results?
Focus on understanding the reasoning behind each formula rather than memorizing it, work through numerical problems regularly, draw diagrams for mechanics and optics problems, and revisit earlier chapters before moving on to new ones.
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Course Roadmap
26 chapters · Learn in order or jump to any available chapter.
Precision and significant figures, Dimensions and uses of dimensional analysis.
Triangle, parallelogram and polygon laws of vectors, Resolution of vectors; Unit vectors, Scalar and vector products.
Instantaneous velocity and acceleration, Relative velocity, Equation of motion (graphical treatment), Motion of a freely falling body, Projectile motion and its applications.
Linear momentum, Impulse, Conservation of linear momentum, Application of Newton's laws, Moment, torque and equilibrium, Solid friction: Laws of solid friction and their verifications.
Work done by a constant force and a variable force, Power, Work-energy theorem; Kinetic and potential energy, Conservation of Energy, Conservative and non-conservative forces, Elastic and inelastic collisions.
Angular displacement, velocity and acceleration, Relation between angular and linear velocity and acceleration, Centripetal acceleration, Centripetal force, Conical pendulum, Motion in a vertical circle, Applications of banking.
Newton's law of gravitation, Gravitational field strength, Gravitational potential; Gravitational potential energy, Variation in value of 'g' due to altitude and depth, Centre of mass and center of gravity, Motion of a satellite: Orbital velocity and time period of the satellite, Escape velocity, Potential and kinetic energy of the satellite, Geostationary satellite, GPS
Hooke's law: Force constant, Stress; Strain; Elasticity and plasticity, Elastic modulus: Young modulus, bulk modulus, shear modulus, Poisson's ratio, Elastic potential energy.
Molecular concept of thermal energy, heat and temperature, and cause and direction of heat flow, Meaning of thermal equilibrium and Zeroth law of thermodynamics, Thermal equilibrium as a working principle of mercury thermometer.
Linear expansion and its measurement, Cubical expansion, superficial expansion and its relation with linear expansion, Liquid Expansion: Absolute and apparent, Dulung and Petit method of determining expansivity of liquid
Newton's law of cooling, Measurement of specific heat capacity of solids and liquids, Change of phases: Latent heat, Specific latent heat of fusion and vaporization, Measurement of specific latent heat of fusion and vaporization, Triple point
Conduction: Thermal conductivity and measurement, Convection, Radiation: Ideal radiator, Black-body radiation, Stefan-Boltzmann law.
Ideal gas equation, Molecular properties of matter, Kinetic-molecular model of an ideal gas, Derivation of pressure exerted by gas, Average translational kinetic energy of gas molecule, Boltzmann constant, root mean square speed, Heat capacities: gases and solids.
Real and Virtual images, Mirror formula
Laws of refraction: Refractive index, Relation between refractive indices, Lateral shift, Total internal reflection.
Minimum deviation condition, Relation between Angle of prism, minimum deviation and refractive index, Deviation in small angle prism.
Spherical lenses, angular magnification, Lens maker's formula, Power of a lens
Pure spectrum and dispersive power, Chromatic and spherical aberration, Achromatism and its applications
Electric charges, Charging by induction, Coulomb's law-Force between two point charges, Force between multiple electric charges.
Electric field due to point charges; Field lines, Gauss Law: Electric Flux, Application of Gauss law: Field of a charge sphere, line charge, charged plane conductor
Potential difference, Potential due to a point Charge, potential energy, electron volt, Equipotential lines and surfaces, Potential gradient
Capacitance and capacitor, Parallel plate capacitor, Combination of capacitors, Energy of charged capacitor, Effect of a dielectric Polarization and displacement.
Electric Currents; Drift velocity and its relation with current, Ohm's law; Electrical Resistance; Resistivity; Conductivity, Current-voltage relations; Ohmic and Non-Ohmic resistance, Resistances in series and parallel, Potential divider, Electromotive force of a source, internal resistance, Work and power in electrical circuits
Nucleus: Discovery of nucleus, Nuclear density; Mass number; Atomic number, Atomic mass; Isotopes, Einstein's mass-energy relation, Mass Defect, packing fraction, BE per nucleon, Creation and annihilation, Nuclear fission and fusion, energy released
Energy bands in solids (qualitative ideas), Difference between metals, insulators and semi-conductors using band theory, Intrinsic and extrinsic semi-conductors
Particle physics: Particles and antiparticles, Quarks (baryons and meson) and leptons (neutrinos), Universe: Big Bang and Hubble law: expansion of the Universe, Dark matter, Black Hole and gravitational wave