cbse syllabus for class 12 physics

CBSE syllabus for class 12 physics, Physics syllabus for class 12  

Unit I: Electrostatics                                                                  (Periods 25)

Electric Charges; Conservation of charge, Coulomb’s law-forcebetween two point charges, forces between multiplecharges; 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 dipolein uniform electric fleld.

Electricflux, statement of Gauss’s theoremand its applications to find field due to infinitely long straightwire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell (field inside and outside).

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

Conductorsand insulators, free charges and bound charges inside a conductor. Dielectrics and electricpolarisation, capacitors and capacitance, combination of capacitors in series and in parallel,capacitance of a parallelplate capacitor with and without dielectric medium between the plates, energy stored in a capacitor. Van de Graaff generator.

Unit II: Current Electricity                                                        (Periods 22)

Electriccurrent, flow of electric charges in a metallicconductor, drift velocity, mobility and their relationwith electric current; Ohm’s law, electrical resistance, V-I characteristics (linear and non-linear), electrical energy and power, electricalresistivity and conductivity. Carbon resistors, colour code for carbon resistors; series and parallelcombinations of resistors; temperature dependence of resistance.

Internalresistance of a cell, potentialdifference and emf of a cell,combination of cells in series and in parallel.

Kirchhoff’s laws and simple applications. Wheatstone bridge, metre bridge.

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

Unit III: Magnetic Effectsof Current and Magnetism           (Periods 25)

Concept of magnetic field, Oersted’s experiment.

Biot - Savartlaw and its application to current carrying circular loop.

Ampere’s law and its applications to infinitely long straight wire. Straightand toroidal solenoids, Force on a movingcharge in uniform magnetic and electric fields. Cyclotron.

Forceon a current-carrying conductor in a uniformmagnetic field. Force between two parallel current-carrying conductors-definition of ampere. Torqueexperienced by a currentloop in uniform magnetic field; moving coil galvanometer-its current sensitivity and conversion to ammeter and voltmeter.

Currentloop as a magneticdipole and its magnetic dipole moment. Magnetic dipole moment of a revolving electron. Magnetic field intensity due to a magneticdipole (bar magnet) along its axis and perpendicular to its axis.Torque on a magnetic dipole (bar magnet) in a uniformmagnetic field; bar magnetas an equivalent solenoid, magnetic field lines; Earth’s magneticfield and magnetic elements. Para-, dia- and ferro - magneticsubstances, with examples. Electromagnets and factors affecting their strengths. Permanent magnets.

Unit IV: ElectromagneticInduction and Alternating Currents    (Periods 20)

Electromagnetic induction; Faraday’s laws, inducedemf and current; Lenz’s Law, Eddy currents. Self and mutual induction.

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, wattless current.

AC generator and transformer.

Unit V:  Electromagnetic waves                                                  (Periods 4)

Needfor displacement current, Electromagnetic waves and their characteristics (qualitative ideas only). Transversenature of electromagnetic waves.

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

Unit VI: Optics                                                                           (Periods 30)

Reflectionof light, spherical mirrors, mirror formula. Refraction of light, total internal reflection and its applications, optical fibres, refraction at spherical surfaces, lenses, thin lens formula, lens- maker’s formula. Magnification, power of a lens, combination of thin lenses in contact, combination of a lens and a mirror. Refraction and dispersion of light through a prism.

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

Optical instruments : Humaneye, image formation and accommodation, correction of eye defects (myopia,hypermetropia) using lenses.Microscopes and astronomical telescopes (reflecting and refracting) and their magnifying powers.

Wave optics: Wave front and Huygen'sprinciple, 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'sdouble slit experiment and expression for fringe width, coherent sources and sustained interference of light. Diffraction due to a single slit, width of centralmaximum. Resolvingpower of microscopes and astronomical telescope. Polarisation, plane polarised light, Brewster's law, uses of plane polarisedlight and Polaroids.

Unit VII: Dual Nature of Matter and Radiation                                                    (Periods8) Dual natureof radiation. Photoelectric effect, Hertzand Lenard’s observations; Einstein’s photoelectric equation-particle nature of light.

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 & Nuclei                                                        (Periods18)

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

Composition and size of nucleus, atomic masses, isotopes, isobars; isotones. Radioactivity- alpha, beta and gamma particles/rays and their properties; radioactive decay law. Mass-energy relation, mass defect; binding energy per nucleon and its variation with mass number; nuclear fission, nuclear fusion.

Unit IX: Electronic Devices                                                       (Periods 18)

Energy bands in solids (Qualitative ideas only) conductor, insulator and semiconductor; semiconductor diode – I-V characteristics in forward and reverse bias, diode as a rectifier;I-V characteristics of LED, photodiode, solar cell, and Zener diode; Zener diode as a voltageregulator. Junction transistor, transistoraction, characteristics of a transistor, transistor as an amplifier (common emitter configuration) and oscillator. Logic gates (OR, AND, NOT, NAND and NOR). Transistor as a switch.

Unit X: Communication Systems                                              (Periods10)

Elementsof a communication system (block diagram only); bandwidth of signals (speech, TV and digitaldata); bandwidth of transmission medium. Propagation of electromagnetic waves in the atmosphere, sky and space wave propagation. Need for modulation. Production and detection of an amplitude-modulated wave.

Practicals                      (Total Periods60)

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

l          Record of at least 15 Experiments [with a minimumof 7 from sectionA and 8 from sectionB], to be performed by the students.

l          Recordof at least 6 Activities[with a minimumof 3 each from sectionA and sectionB], to be demonstrated by the teachers.

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

Evaluation Scheme                                                                          Total Periods: 60

Two experiments one from each section Practical record [experiments & activities] Project Viva on experiments & project	8+8 Marks 6 Marks 3 Marks 5 Marks
	Total 30 Marks

SECTION A

Experiments

(Any 7 experiments out of the following to be performed by the students)

1.      To determineresistance per cm of a givenwire by plotting a graphof potential difference versus current.

2.      To find resistance of a givenwire using metre bridge and hence determine the resistively

(specific resistance) of its material

3.      To verify the laws of combination (series/parallel) of resistances using a metrebridge.

4.      To compare the emf of two given primary cells using potentiometer.

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

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

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

8.      To find the frequency of the a.c. mains with a sonometer.

Activities (For the purpose of demonstration only)

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

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

3.      To assemblea household circuitcomprising three bulbs, three (on/off) switches, a fuse and a power source.

4.      To assemble the components of a givenelectrical circuit.

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

6.      To draw the diagramof a given open circuitcomprising 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

(Any 8 experiments out of the following to be performed by the students)

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

2.      To find the focal length of a convexmirror, usinga convex lens.

3.      To find the focal length of a convexlens by plotting graphs between u and v or between

1/u and 1/v.

4.      To find the focal length of a concavelens, using a convexlens.

5.      To determineangle of minimum deviation for a givenprism by plotting a graphbetween angle of incidenceand angle of deviation.

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

7.      To find refractive index of a liquidby using (i) concave mirror, (ii) convexlens and plane mirror.

8.      To draw the I-V characteristic curve of a p-n junctionin forward bias and reverse bias.

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

10.    To studythe characteristic of a common- emitter npn or pnp transistor and to find out the values of currentand voltage gains.

Activities (For the purpose of demonstration only)

1.      To identifya diode an LED, a transistor, an IC, a resistor and a capacitorfrom a mixed collection of such items.

2.      Use of multimeterto (i) identify base of transistor, (ii) distinguish between npn and pnp type transistors, (iii) see the unidirectional flow of current in case of a diodeand an LED, (iv) check whether a given electroniccomponent (e.g. diode, transistor or IC) is in working order.

3.      To study effect of intensity of light (by varying distance of the source) on an L.D.R.

4.      To observerefraction and lateral deviation of a beam of light incidentobliquely on a glass slab.

5.      To observe polarization of light using two Polaroids.

6.      To observe diffraction of light due to a thin slit.

7.      To study the natureand size of the image formed by a (i) convexlens, (ii) concave mirror, on a screenby using a candleand a screen(for different distances of the candle from the lens/mirror).

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

SUGGESTED INVESTIGATORY PROJECTS CLASS XII

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

2.      To study the variations, in current flowing, in a circuitcontaining a LDR, becauseof a variation. (a)       in the power of the incandescent lamp, used to 'illuminate' the LDR. (keeping all the lamps

at a fixed distance).

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

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

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

5.      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 designedtransformer.

6.      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.

7.      To estimatethe charge induced on each one of the two identical styro foam (or pith) balls suspended in a verticalplane by making use of Coulomb's law.

8.      To set up a common base transistor circuit and to study its input and output characteristic and to calculateits current gain.

9.      To studythe factor on which the self inductance of a coil dependsby observing the effect of this coil, when put in series with a resistor/(bulb) in a circuitfed up by an a.c. source of adjustable frequency.

10.    To construct a switch usinga transistor and to draw the graphbetween the inputand output voltageand mark the cut-off, saturation and active regions.

11.    To study the earth's magnatic field using a tangentgalvanometer.

Recommended Textbooks.

1.      Physics, Class XI, Part -I &II, Published by NCERT.

2.      Physics, Class XII, Part -I &II, Published by NCERT.