CBSE Class 12 Physics important topics Chapter wise

CBSE Class 12 physics important topics chapter wise

Here are some important topics of Physics class 12 for CBSE board exam. You will get all the needed information related to subjects and sub-subjects in Physics. Every subject will introduce you to all the compulsory concepts related to CBSE class 12 physics. If you have any problem about the mentioned concepts, So you can update in this website and watch all the theoretical videos to reinforce your concepts, modify the video to revise the chapter near your board exams, use the most important questions and Can get an edge over previous year papers in preparing for your board examination, Students should provide precedence to the topics given in this article.

Important topics of physics class 12: CBSE Class 12 Physics curriculum is huge. Total 10 units and 14 chapters, it is important to know the all important topics, numerical and derivations in class 12 physics to study them efficiently. Given below are important topics & derivations for Class 12 Physics.

Class 12 physics important topics

Chapter 1. Electric Charges and Fields

  • Coulomb’s law
  • Forces between multiple charges
  • Electric field due to system of charges
  • Electric field at a point on the axial line and equatorial line due to electric dipole
  • Electric flux and gauss’ theorem application
a) The given topics are based on basic coulomb’s law, electric field and electric dipole. 
b) CBSE exam always asked numerical based on applications of gauss law and electric field due to electric dipole.
c) Derivations are always asked for torque on an electric field by dipole, electric field at a point on the axial line and equatorial line due to electric dipole.
d) Students only follow NCERT book and previous year questions.

Chapter 2. Electrostatic Potential and Capacitance

  • Potential due to a Point Charge
  • Equipotential Surfaces
  • Dielectrics and Polarization
  • Combination of Capacitors
  • Energy stored in a capacitor

a) This chapter provides a good weightage and given more opportunity for Numerical.
Derivations asked from The Parallel Plate Capacitor, Energy Stored in Capacitor are frequently asked,
b) Students always keep in mind follow only NCERT Book and Previous year question paper.
c) This chapter has asked a lot of Numerical in the exam so give more time for Numerical.

Chapter 3. Current Electricity

  • Ohm’s Law
  • Limitations of ohm’s law
  • Expression for drift velocity
  • Combination of resistors
  • Combination of cell
  • Kirchhoff’s law
  • Potentiometer and its application
  • Meter Bridge

a) Definitions and Relations of Drift Velocity, Conductor, Resistance, Cell EMF, Carbon Compound, are frequently asked for short answer.
b) Graph of resistivity of Conductor & Semiconductor with temperature, Current versus Voltage, Mobility is always asked.
c) Numerical direct asked from Kirchhoff’s law, Drift Velocity, Potentiometer is frequently asked every year in CBSE exam.
d) Learn Colour Code of Carbon Resistance, short question can be asked.

Chapter 4. Moving Charges and Magnetism

  • Biot- Savart’s Law: Magnetic Field due to a Current Element
  • Applications of Ampere’s Circuital Law
  • Lorentz force and Cyclotron
  • Magnetic force and Torque between two Parallel Currents
  • Moving coil Galvanometer into an Ammeter & Voltmeter
a) Derivations from topics like Magnetic field on the axis of circular coil, Ampere’s Circuital Law, Magnetic force and Torque between Two Parallel Currents are asked.
b) Cyclotron & Galvanometer with its Principle, Diagram, Working, and Construction should be studies intensively.

Chapter 5. Magnetism and Matter

  • Bar Magnet as an equivalent Solenoid
  • Magnetic Dipole an Magnetic Field Lines
  • Earth as a Magnet
  • Properties of Diamagnetism, Paramagnetism, Feromagnetism Substances
  • Permanent Magnets and Electromagnets

a) Numerical ask from Earth as a magnet
b) Definition ask direct from Diamagnetism, Para magnetism, Ferromagnetism Substances.
c) This chapter is a high scoring with less study and gives more numbers, so only follow NCERT Book and Previous year Question.

Chapter 6. Electromagnetic Induction

  • Magnetic Flux
  • Electromagnetic Induction and Lenz’s Laws
  • Self inductance and mutual inductance
  • Motional EMF or Induced EMF
  • AC Generator

a) A Variety of Numerical are asked based on the concepts of Motional EMF or Induced EMF
b) Explain the Eddy Currents and its examples, Self Inductance, Mutual Inductance are short answers from are also important for Examination.
c) Five Marks will be given mainly to explain the AC generator diagram and it’s working.

Chapter 7. Alternating Current

  • Peak and RMS value of alternating Current/ Voltage
  • L-C-R, L-R, L-C Series Circuit
  • Resonance Power in AC Circuits
  • Transformer

a) Write a short Summary for RC, LC, LR and LCR combinations with their impedances and Phasor diagrams this is the best method to derive or solving Numerical from given topics.
b) Confirm Numerical expected asked from L-C-R, L-R, L-C Series Circuit.
c) Transformer numerals are sometimes asked for short answers.

Chapter 8. Electromagnetic Waves

  • Displacement Current
  • Oscillating electric and Magnetic fields
  • Electromagnetic Waves
  • Electromagnetic spectrum

a) The important topics of Numerical raise from Electromagnetic Spectrum.
b) The important question of electromagnetic waves of properties, use, example of EM waves and how it produce, This does not require in-depth study, but it will help to answer very few questions in the table as well as small questions from the subject.

Chapter 9. Ray Optics and Optical Instruments

  • Total Internal Reflection
  • Image formation by Spherical Mirrors
  • Power and combination of thin lenses
  • Refraction of light through a Prism
  • Scattering of light (Blue colour of sky and reddish appearance of the sun at sunrise and sunset)
  • Optical Instrument: Microscopes and astronomical telescopes

a) All of the important topics mentioned are easy, but often students get confused in mirrors and lenses and blunders because of incorrect sign conventions. Strictly follow the new Cartesian sign conventions when using a mirror or lens formula. It is also suggested to create a comparison table for both mirrors and lenses to avoid confusion and recall.
b) Total internal reflection & refraction is an easy topic should not be avoided.
c) Refraction and dispersion of light through a prism, Total Internal Reflection are important for numerical.
d) Refraction of light through a Prism is an important topic for derivation will be asked in exam.
e) Draw a Diagram of Telescope and microscope are both important optical instrument based on the above topics we have studies

Chapter 10. Wave Optics

  • Wave fronts
  • Refraction and Reflection of Plane Waves using Huygens Principle
  • Interference of Light Waves
  • Young’s double slit experiment
  • Diffraction of light
  • Polarisation

a) The law of refraction and reflection is an important derivation using Huygens Principle is Asks a lot of times.
b) Young’s double slit experiment is very important derivation and its expression of the width of dark and bright fringes.
c) Diffraction of light and Polarization does not require intensive study, just a brief understanding is sufficient to answer the basic questions asked in exam.

Chapter 11. Dual Nature of Radiation and Matter

  • Experimental Study of Photoelectric Effect
  • Einstein’s Photoelectric equation: Energy Quantum of Radiation
  • de Broglie Hypothesis
  • Davisson-Germer Experiment
  • Laws of Photoelectric Emission

a) List important relation such as physical quantities like effect of frequency of incident Radiation on Stopping Potential, Relation between Stopping Potential and Threshold Frequency and Relation between de-Broglie Wavelength and Temperature n the based question asked like numerical and question will be asked.
b) Einstein’s Photoelectric equation: Energy Quantum of Radiation, Planck’s constant and Photoelectric Effect are important topics direct question or derivations.
c) Some important Graphs Related to Photoelectric Effect  and effect of Potential on Photoelectric Current and Stopping Potential.           

Chapter 12. Atoms

  • Alpha-particle scattering experiment by Rutherford
  • Bohr’s Model of Hydrogen Atom
  • Energy Level Diagram
  • Limitations of Bohr’s Model

a) Alpha-particle scattering experiment by Rutherford, three Bohr’s Postulates are important topic for every year.
b) Revise the series of Energy Level Diagram. this chapter is basicaly theoretically based question asked in exam.

Chapter 13. Nuclei

  • Nuclear binding energy
  • Nuclear Force
  • Radioactivity
  • Nuclear fission and nuclear fusion

a) The chapter is basically divided into two sections. The first section is completely theoretical. A deeper understanding of the subject is necessary to understand the second section of the chapter. The second part of the covers radioactivity, from which numerical and response based questions are asked.
b) Alpha decay, Beta decay, gamma decay and Nuclear binding energy all the topic are very important.

Chapter 14. Semiconductor Electronics: Materials, Devices and Simple CircuitsEnergy band in Conductors

  • Semiconductor diode: I-V characteristics in forward bias and reverse bias
  • Diode as a rectifier; Special Purpose
  • p-n Junction diode in forward bias and reverse bias
  • Zener Diode as a voltage regulator
  • Transistor as an amplifier


The entire given "CBSE Class important topics chapter wise" are necessary for CBSE exam. Student does not miss all these CBSE class 12 physics important topics chapter wise. If you have just passed the exam, you ignore it, you will not be able to get good marks in the exam, then understand these topics, and then you can pass through the Ace number.

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