 Check the new CBSE Class 12 Physics syllabus 2020-21 and download it in PDF format. CBSE Syllabus for Class 12 Physics is very important for the preparation of CBSE 12th Physics board exam 2020-21. CBSE Class 12 Physics Syllabus

Check the new CBSE Class 12 Physics syllabus 2020-21 and download it in PDF format. CBSE Syllabus for Class 12 Physics is very important for the preparation of CBSE 12th Physics board exam 2020-21.

## CBSE Class 12 Physics Syllabus 2020-21

 No. of Periods Marks Unit–I Electrostatics 24 16 Chapter–1: Electric Charges and Fields Chapter–2: Electrostatic Potential and Capacitance Unit-II Current Electricity 18 Chapter–3: Current Electricity Unit-III Magnetic Effects of Current and Magnetism 22 17 Chapter–4: Moving Charges and Magnetism Chapter–5: Magnetism and Matter Unit-IV Electromagnetic Induction and Alternating Currents 20 Chapter–6: Electromagnetic Induction Chapter–7: Alternating Current Unit–V Electromagnetic Waves 04 18 Chapter–8: Electromagnetic Waves Unit–VI Optics 27 Chapter–9: Ray Optics and Optical Instruments Chapter–10: Wave Optics Unit–VII Dual Nature of Radiation and Matter 08 12 Chapter–11: Dual Nature of Radiation and Matter Unit–VIII Atoms and Nuclei 15 Chapter–12: Atoms Chapter–13: Nuclei Unit–IX Electronic Devices 12 7 Chapter–14: Semiconductor         Electronics: Materials, Devices and Simple Circuits Total 150 70

NCERT Exemplar Solutions for CBSE Class 12 Physics: All Chapters

NCERT Solutions for CBSE Class 12 Physics

Unit I:Electrostatics

Chapter–1: Electric Charges and Fields

Electric Charges; Conservation of charge, Coulomb's law-force 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 uniform electric fleld.

Electric  flux, statement of Gauss's theorem and its  applications to find field due to infinitely long straight wire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell (field inside and outside).

Chapter–2: Electrostatic Potential and Capacitance

Electric potential, potential difference, electric potential due to a point charge, a dipole and system of  charges; equipotential surfaces, electrical potential energy of a system of two point charges and of  electric dipole in an electrostatic field.

Conductors  and insulators,   free charges and bound    charges inside a conductor. Dielectrics and electric polarisation, capacitors and capacitance, 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 II: Current Electricity

Chapter–3: Current Electricity

Electric current, flow of electric charges in a metallic conductor, drift velocity, mobility   and their relation with electric current; Ohm's law, electrical resistance, V-I characteristics  (linear and non-linear), electrical energy and power, electrical resistivity and conductivity, Carbon resistors, colour code for carbon resistors; series and parallel combinations of resistors; temperature dependence of resistance.

Internal resistance of a cell, potential difference and emf of a cell, combination of  cells in series and in parallel, Kirchhoff's laws and simple applications, Wheatstone bridge, metre bridge.

Potentiometer  - principle and its  applications to measure potential  difference and for comparing EMF of two cells; measurement of internal resistance of a cell.

Unit III:    Magnetic Effects of Current and Magnetism

Chapter–4: Moving Charges and Magnetism

Concept of magnetic field, Oersted's experiment.

Biot - Savart law and its application to current carrying circular loop.

Ampere's law and its applications to infinitely long straight wire. Straight and toroidal solenoids (only qualitative treatment), 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.

Chapter–5: Magnetism and Matter

Current loop as a magnetic dipole and its magnetic dipole moment, magnetic dipole  moment of a revolving electron, magnetic field intensity due to a magnetic  dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole (bar magnet) in a uniform magnetic field; bar magnet as an equivalent solenoid, magnetic field lines; earth's magnetic field and magnetic elements.

Para-, dia- and ferro - magnetic substances, with examples. Electromagnets and factors affecting their strengths, permanent magnets.

Unit IV:   Electromagnetic Induction and Alternating Currents

Chapter–6: Electromagnetic Induction

Electromagnetic induction; Faraday's laws, induced EMF and current; Lenz's

Law, Eddy currents. Self and mutual induction.

Chapter–7: Alternating Current

Alternating currents, peak and RMS value of alternating current/voltage; reactance and impedance; LC oscillations (qualitative treatment only), LCR series circuit, resonance; power in AC circuits, power factor, wattless current.

AC generator and transformer.

Unit V: Electromagnetic waves

Chapter–8: Electromagnetic Waves

Basic idea of displacement current, Electromagnetic waves, their characteristics, their Transverse nature (qualitative ideas only).

Electromagnetic spectrum (radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays) including elementary facts about their uses.

Unit VI: Optics

Chapter–9: Ray Optics and Optical Instruments

Ray Optics: Reflection of light, spherical mirrors, mirror formula, refraction of light, total internal reflection and its applications, optical fibres, refraction at spherical  surfaces, lenses, thin lens formula, lensmaker's formula, magnification, power of a lens, combination of thin lenses in contact, refraction of light through a prism.

Scattering of light - blue colour of sky and reddish apprearance of the sun at sunrise and sunset.

Optical instruments: Microscopes and astronomical telescopes (reflecting and refracting) and their magnifying powers.

Chapter–10: Wave Optics

Wave optics: Wavefront and Huygen’s principle, reflection and refraction of plane  wave at a plane surface using wave fronts. Proof of laws of reflection and refraction using Huygen's principle. Interference, Young's double slit experiment and expression for fringe width,  coherent sources and sustained interference of light, diffraction due to a single slit, width of central maximum, resolving power of microscope and astronomical telescope, polarisation, plane  polarised light, Brewster's law, uses of plane polarised light and Polaroids.

Unit VII:  Dual Nature of Radiation and Matter

Chapter–11: Dual Nature of Radiation and Matter

Dual nature of radiation, Photoelectric effect, Hertz and Lenard's observations; Einstein's photoelectric equation-particle nature of light.

Experimental study of photoelectric effect

Matter waves-wave nature of particles, de-Broglie relation, Davisson-Germer experiment (experimental details should be omitted; only conclusion should be explained).

Unit VIII:  Atoms and Nuclei

Chapter–12: Atoms

Alpha-particle scattering experiment; Rutherford's model of atom; Bohr model, energy levels, hydrogen spectrum.

Chapter–13: Nuclei

Composition and size of nucleus, Radioactivity, alpha, beta and gamma particles/rays  and their properties; radioactive decay law, half life and mean life.

Mass-energy  relation, mass  defect; binding   energy per nucleon  and its variation with mass number; nuclear fission, nuclear fusion.

Unit IX:Electronic Devices

Chapter–14: Semiconductor Electronics: Materials,  Devices and Simple Circuits

Energy bands in conductors, semiconductors  and insulators (qualitative ideas only)

Semiconductor diode - I-V characteristics in forward and reverse bias, diode as a rectifier;

Special  purpose p-n  junction diodes:  LED, photodiode, solar  cell and Zener diode and their characteristics, zener diode as a voltage regulator.

CBSE Class 12 Physics Syllabus 2020-21: PRACTICALS

The record to be submitted by the students at the time of their annual examination has to include:

Record of at least 12 Experiments [with 6 from each section], to be performed by the students.

Record of at least  6 Activities [with  3 each from section A and section  B], to be performed by the students.

The Report of the project to be carried out by the students.

Evaluation Scheme

Time Allowed: Three hours, Max. Marks: 30

 Two experiments one from each section 7+7 Marks Practical record [experiments and activities] 5 Marks One activity from any section 3 Marks

 Investigatory Project 3 Marks Viva on experiments, activities and project 5 Marks Total 30 marks

Experiments

SECTION–A

To determine resistivity of two / three wires by plotting a graph for potential difference versus current.

To find resistance of a given wire / standard resistor using metre bridge.

To verify the laws of combination (series) of resistances using a metre bridge.

OR

To verify the laws of combination (parallel) of resistances using a metre bridge.

To compare the EMF of two given primary cells using a potentiometer.

To determine the internal resistance of a given primary cell using a potentiometer.

To determine resistance  of a galvanometer by half-deflection method and to find  its figure of merit.

To convert the given  galvanometer (of known resistance  and figure of merit) into a voltmeter of desired range and to verify the same.

OR

To convert the given galvanometer (of known  resistance and figure of merit) into an ammeter of desired range and to verify the same.

To find the frequency of AC mains with a sonometer.

Activities

To measure the resistance and impedance of an inductor with or without iron core.

To measure resistance, voltage (AC/DC), current (AC) and check continuity of a given circuit using a multimeter.

To assemble a household circuit comprising three bulbs, three (on/off) switches, a fuse and a power source.

To assemble the components of a given electrical circuit.

To study the variation in potential drop with length of a wire for a steady current.

To draw the diagram of a given open circuit comprising at least a battery, resistor/rheostat,  key, ammeter and voltmeter. Mark the components that are not connected in proper order and correct the circuit and also the circuit diagram.

Experiments

SECTION-B

To find the value of v for different values of u in case of a concave mirror and to find the focal length.

To find the focal length of a convex mirror, using a convex lens.

To  find the focal  length of a convex lens  by plotting graphs between u  and v or between 1/u and 1/v.

To find the focal length of a concave lens, using a convex lens.

To  determine  angle of minimum  deviation for a given  prism by plotting a graph between angle of incidence and angle of deviation.

To determine the refractive index of a glass slab using a travelling microscope.

To find the refractive index of a liquid by using a convex lens and plane mirror.

To  draw the  I-V characteristic  curve for a p-n junction  diode in forward bias and reverse bias.

To draw the characteristic curve of a zener diode and to determine its reverse breaks down voltage.

Activities

To identify  a diode, an LED, a resistor  and a capacitor from a mixed collection  of such items.

Use of a multimeter to see the unidirectional flow of current in case of a diode and an LED  and check whether a given electronic component (e.g., diode) is in working order.

To study the effect of intensity of light (by varying distance of the source) on an LDR.

To observe refraction and lateral  deviation of a beam of light incident  obliquely on a glass slab.

To observe polarization of light using two Polaroids.

To observe diffraction of light due to a thin slit.

To study the nature and size of the image formed by a (i) convex lens, (ii) concave mirror, on  a screen by using a candle and a screen (for different distances of the candle from the lens/mirror).

To obtain a lens combination with the specified focal length by using two lenses from the given set of lenses.

Suggested Investigatory Projects

To study various factors on which the internal resistance/EMF of a cell depends.

To study the variations in current flowing in a circuit containing an LDR because of a variation in

(a) the power of the incandescent  lamp, used to 'illuminate' the LDR (keeping  all the lamps at a fixed distance).

(b) the distance of a incandescent lamp (of fixed power) used to 'illuminate' the LDR.

To find the refractive indices of (a) water (b) oil (transparent) using a plane mirror, an equi  convex lens (made from a glass of known refractive index) and an adjustable object needle.

To design an appropriate logic gate combination for a given truth table.

To investigate  the relation between the ratio  of (i) output and input voltage  and (ii) number of turns in the secondary coil and primary coil of a self-designed transformer.

To investigate  the dependence of the angle  of deviation on the angle of incidence using a hollow prism filled one by one, with different transparent fluids.

To estimate  the charge induced  on each one of the two identical  styrofoam (or pith) balls suspended in a vertical plane by making use of Coulomb's law.

To study the factor on  which the self-inductance of a coil depends by observing the effect of this coil, when put in series with a resistor/(bulb) in a circuit fed up by an A.C. source of adjustable frequency.

To study the earth's magnetic field using a tangent galvanometer.