CBSE board deleted 30% of the syllabus from the total syllabus in all subjects and practicals due to the loss of the number of working days in the academic year 2020 (due to the COVID 19 pandemic). From practical, CBSE board removed the entire investigatory project and activities. In physic, the deleted topics in the syllabus are mentioned below.
Removed topics in Class 12 Physics - Lesson Wise
Chapter 1: Electric charges and field
Uniformly charged thin spherical shell. (inside and outside)
Chapter 2: Electric Potential and Capacitors
Nothing is removed from this chapter.
Chapter 3: Current Electricity
Carbon resistors, colour coding, series, and parallel combination of resistors.
Chapter 4: Moving Charges and Magnetism
Cyclotron
Chapter 5: Magnetism and Matter
Many topics removed from this lesson. Those are
Magnetic field intensity due to a magnetic dipole (Bar magnet along its axis and equatorial), torque on a bar magnetic in a uniform magnetic field, para, dia, and ferromagnetic substances with examples, electromagnets, and factors affecting their strengths and permanent magnets.
Chapter 6: Electromagnetic induction
Nothing is removed from this chapter.
Chapter 7: Alternating Currents
Power factor and wattless current.
Chapter 8: Electric Magnetic Waves
The basic idea of displacement current.
Chapter 9: Ray Optics
Reflection of the light, spherical mirror, mirror formula, scattering of light - blue colour of the sky and reddish appearance of the sun at sunrise and sunset, resolving power of a microscope and astronomical telescope
Chapter 10: Wave Optics
Polarisation, plane polarised light, Brewster's law, uses of plane polarised light and polaroids.
Chapter 11: Dual nature of radiation
Davisson and Germer experiment
Chapter 12: Atoms
Nothing is removed from this chapter.
Chapter 13: Nuclei
Radioactivity, alpha, beta and gamma particles/rays, and their properties, the law of radioactivity, half-life and mean life. Binding energy per nucleon and its variation with mass number.
Chapter 14: Semiconductors
Zener diode and its characteristics and Zener diode as a voltage regulator.
