## CBSE Syllabus for Class 12 Physics

### Course Structure for Class XII Physics (2017-18)

 Unit Chapter / Topic Marks I Electrostatics 15 Chapter 1: Electric Charges and Fields Chapter 2: Electrostatic Potential and Capacitance II Current Electricity Chapter 3: Current Electricity III Magnetic Effect of Current & Magnetism 16 Chapter 4: Moving Charges and Magnetism Chapter 5: Magnetism and Matter IV Electromagnetic Induction & Alternating Current Chapter 6: Electromagnetic Induction Chapter 7: Alternating Current V Electromagnetic Waves 17 Chapter 8: Electromagnetic Waves VI Optics Chapter 9: Ray Optics and Optical Instruments Chapter 10: Wave Optics VII Dual Nature of Matter 10 Chapter 11: Dual Nature of Radiation and Matter VIII Atoms & Nuclei Chapter 12: Atoms Chapter 13: Nuclei IX Electronic Devices 12 Chapter 14:  Semiconductor  Electronics X Communication Systems Chapter 15: Communication Systems Total 70

### 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 field.

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,  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,  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 combination  of a lens and a mirror. Refraction and dispersion 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: Wave front 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 microscopes and astronomical telescopes. Polarisation, plane polarised  light Brewster’s law, uses of plane polarised light and Polaroids.

### Unit VII: Dual Nature of Matter and Radiation

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.

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

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, 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

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.

Junction transistor, transistor action, characteristics of a transistor and transistor as an amplifier (common emitter configuration), basic idea of analog and digital signals, Logic gates (OR, AND, NOT, NAND and NOR).

### Unit X: Communication Systems

Chapter 15: Communication Systems

Elements of a communication system (block diagram only); bandwidth of signals (speech, TV and digital data); bandwidth of transmission medium. Propagation of electromagnetic waves in the atmosphere, sky and space wave propagation, satellite communication. Need for modulation, amplitude modulation and frequency modulation, advantages of frequency modulation over amplitude modulation.

### Practicals

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

• Record of at least 15 Experiments [with a minimum of 6 from each section], to be performed by the students.
• Record of at least 5 Activities [with a minimum of 2 each from section A and section B], to be demonstrated by the teachers.
• The Report of the project to be carried out by the students.

Evaluation Scheme

Time Allowed: Three hours
Max. Marks: 30 marks

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

SECTION-A

Experiments

1. To determine resistance per cm of a given wire by plotting a graph for potential difference versus current.
2. To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material.
3. To verify the laws of combination (series) of resistances using a metre bridge.
4. To verify the laws of combination (parallel) of resistances using a metre bridge.
5. To compare the EMF of two given primary cells using potentiometer.
6. To determine the internal resistance of given primary cell using potentiometer.
7. To determine resistance of a galvanometer by half-deflection method and to find its figure of merit.
8. To convert the given galvanometer (of known resistance and figure of merit) into a voltmeter of desired range and to verify the same.
9. To convert the given galvanometer (of known resistance and figure of merit) into an ammeter of desired range and to verify the same.
10. To find the frequency of AC 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 measure resistance, voltage (AC/DC), current (AC) and check continuity of a given circuit using multimeter.
3. To assemble a household circuit comprising three bulbs, three (on/off) switches, a fuse and a power source.
4. To assemble the components of a given electrical circuit.
5. To study the variation in potential drop with length of a wire for a steady current.
6. To draw the diagram of a given open circuit comprising at (east 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.

SECTION-B

Experiments

1. To find the value of y 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 convex mirror, using a convex lens.
3. To find the focal length of a convex lens by plotting graphs between u and y or between 1/u and 1/v.
4. To find the focal length of a concave lens, using a convex lens.
5. To determine angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation.
6. To determine refractive index of a glass slab using a travelling microscope.
7. To find refractive index of a liquid by using convex lens and plane mirror.
8. To draw the I-V characteristic curve for a p.n junction in 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 study the characteristic of a common – emitter npn or pnp transistor and to find out the values of current and voltage gains.

Activities
(For the purpose of demonstration only)

1. To identify a diode, an LED, a transistor, an IC, a resistor and a capacitor from a mixed collection of
such items.
2. Use of multimeter to (i) identify base of transistor, (ii) distinguish between npn and pnp type transistors, (iii) see the unidirectional flow of current in case of a diode and an LED, (iv) check whether a given electronic component (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 LDR.
4. To observe refraction and lateral deviation of a beam of light incident obliquely 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 nature and size of the image formed by a (1) 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).
8. To obtain a lens combination with the specified focal length by using two lenses from the given set of lenses.

Suggested Investigatory Projects

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 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.
3. 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.
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 designed transformer.
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 estimate the charge induced on each one of the two identical styrofoam (or pith) balls suspended in a vertical plane by making use of Coulombs law.
8. To set up a common base transistor circuit and to study its input and output characteristic and to calculate its current gain.
9. 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.
10. To construct a switch using a transistor and to draw the graph between the input and output voltage and mark the cut-off, saturation and active regions.
11. To study the earths magnetic field using a tangent galvanometer.