Important Chapters & Topics of Physics for CBSE Class 12th Board Exam 2021

At exam time CBSE class 12th, related students are highly viewed under stress and performance pressure. As it is the duration of the academic session that affects the performance of the students to a great extent. It is important for them to shift their regular approach of study to a data-based calculative approach. Therefore, like other subjects, the marking for CBSE class 12th board exam can be done through the weightage based important chapters and topics of physics, the most profound way to excel in physics.

Students who could not study for the whole year due to some reasons due to illness etc., should try to prepare important chapters and physics subjects for CBSE class 12th board exam. He carries a 43% marking weight, which helps you get at least 33% passing mark. These important chapters are –

  • Ch-14 Semi-Conductor carrying 7 Marks
  • Ch-11 Dual Nature of Radiation and Ch-13 Nuclei having a marking weightage of 8 Marks

Ray Optics which is the 9th chapter and can add 8 marks to your score. And if you get some more time then you should try to cover few topics of Ch-10 Wave Optics with marking breakup as mentioned below-

  • Derivation of young double slit experiment & Numerical based – 3 Marks
  • Huygens’s principle – 1, 2 Marks
  • Explanation of reflection, Refraction by Huygens principle – 2, 3 Marks
  • Polarisation – 3 Marks

In case you want to add few more marks to your CBSE class 12th board result of physics paper, then you should target Ch-1 Electric Charges & Field, Ch-2 Electrostatic Potential & Capacitance, and Ch-3 Current Electricity which carries 16 Marks.

Marking Weightage:

Although the CBSE board have released the blueprint of the class 12th board physics syllabus, it is hard to locate and understand the marking weightage of the involved topics. Therefore to help you prepare and target your CBSE class 12th board examination 2021, we are mentioning below the expected marks breakup.

Electric charge and field

  • Coulombs law – 1, 2, 3 Marks
  • Electric field by dipole axial and equatorial – 3 Marks
  • Gauss theorem and flux – 3 Marks
Electric potential and capacitance

  • Electric potential energy by the system – 3 Marks
  • Electric potential system – 1, 3 Marks
  •  Electric potential by dipole – 3 Marks
  •  Arrangement of capacitor – 3 Marks
  • Energy stored in capacitor – 3 Marks
Current electricity

  • Derivation based on drift velocity – 2, 3 Marks
  • Conductivity & Resistivity – 1, 2 Marks
  • Kirchhoff’s law – 3 Marks
  • Resistor arrangement – 2, 3 Marks
  • Cell equation – 2 Marks
  • Wheat stone bridge, meter bridge – 3 Marks
  • Potentiometer – 3, 5 Marks
Moving charge and magnetism

  • Ampere’s law – 2, 3 Marks
  •  Solenoid torrid – 3 Marks
  • Force acting on current-carrying wire placed in uniform Magnetic field – 3 Marks
  • Torque acting carrying loop placed in the uniform magnetic field – 3 Marks
  •  Magnetic moment – 1, 2 Marks
Matter and Magnetism

  • Diamagnetic, paramagnetic, ferromagnetic – 3 Marks
  • Geo magnetic – 2, 3 Marks
  • Curie law – 1 Mark
Electromagnetic induction

  • Faraday law, Lenz law – 3, 5 Marks
  • Electromotive force motional rotational – 3 Marks
  • Self, Mutual induction – 3 Marks
Alternating current

  •  L-C-R circuit – 3 Marks
  • Power factor, Q-Value – 1, 2 Marks
  • Transformer – 3 Marks
Electromagnetic wave

  • Displacement current – 2, 3 Marks
  •  Electromagnetic spectrum – 1, 2 Marks
  •  Uses of EMW (Electromagnetic wave) – 1 Marks
Ray optics

  • Mirror equation (Derivation, Numerical) -3 Marks
  • Refraction through the spherical surface (Derivation, Numerical) – 3 Marks
  • Total internal reflection – 3 Marks
  • Prism – 3 Marks
  • Microscope, Telescope – 2, 3, 5 Marks
Wave optics

  • Derivation of young double slit experiment & Numerical based – 3 Marks
  • Huygens’s principle – 1, 2 Marks
  •  Explanation of reflection, Refraction by Huygens principle – 2, 3 Marks
  • Polarisation – 3 Marks
Dual Nature of Radiation & Matter

  • Photoelectric effect graphs – 1, 2, 3 Marks
  •  Einstein’s equation – 1, 2, Marks
  • Matter-wave – 1, 2, Marks
Semi-conductor

  • PN-Diode forward, Reverse – 1, 2 Marks
  • Devices [LED, photocell, Solar Cell, Zeon diode, Rectifier] – 3 Marks
  •  Gates Circuits – 3 Marks
Atom

  • Rutherford Modal – 2, 3 Marks
  •  Hydrogen Spectrum – 3 Marks
  •  Bohr Postulates – 2, 3 Marks
Nuclei

  • Mass defect – 2, 3 Marks
  • Graphs binding energy per nucleons – 2, 3 Marks
  • Alpha-beta, Gamma decay – 2, 3 Marks
  • Nuclear Fusion & Fission – 2, 3 Marks

There is nothing special in the world. Nothing magic. Just physics.

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