New Syllabus of Physics Class 12 CBSE 2020-21 || PDF

CBSE Class 12 Physics Syllabus 2020-21:  CBSE कक्षा 12 बोर्ड परीक्षा की तैयारी करने वाले छात्रों को सभी विषयों के लिए विस्तृत  पाठ्यक्रम के बारे में पता होना चाहिए। विस्तृत CBSE कक्षा 12 का सिलेबस उनकी तैयारी के अंतिम चरण के दौरान विशेष रूप से सहायक होगा।  इसे ध्यान में रखते हुए, हम  भौतिक विज्ञान (Physics ) का  विस्तृत पाठ्यक्रम शेयर कर रहे हैं।

भौतिकी न केवल बोर्ड परीक्षा के लिए बल्कि विभिन्न प्रतियोगी परीक्षाओं के लिए भी एक महत्वपूर्ण विषय है। इंजीनियरिंग और मेडिकल दोनों उम्मीदवारों को Physics  विषय के लिए तैयार करने की आवश्यकता है। इंजीनियरिंग और मेडिकल प्रवेश परीक्षा – जेईई मेन और एनईईटी – दोनों कक्षा 11 और 12 के लिए सीबीएसई पाठ्यक्रम पर आधारित हैं। इसलिए, भौतिकी के लिए विस्तृत सीबीएसई कक्षा 12 का पाठ्यक्रम इंजीनियरिंग और मेडिकल उम्मीदवारों को भी मदद करेगा।

CBSE Class 12 Physics Syllabus 2020-21

Revised Latest CBSE 12th Physics Syllabus

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

(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; 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(qualitative ideas only)
• Potentiometer – principle and its applications to measure potential difference and for comparing EMF of two cells; measurement of internal resistance of a cell(qualitative ideas only)

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
• Force on a current-carrying conductor in a uniform magnetic field, the 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, bar magnet as an equivalent solenoid, magnetic field lines; earth’s magnetic field and magnetic elements.

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
• AC generator and transformer.

Unit V: Electromagnetic waves

(Chapter–8)  Electromagnetic Waves

• Electromagnetic waves, their characteristics, their Transverse nature (qualitative ideas only).
• Electromagnetic spectrum (radio waves, microwaves, infrared, visible, ultraviolet,  gamma rays) including elementary facts about their uses.

Unit VI: Optics

(Chapter–9) Ray Optics and Optical Instruments

• Ray Optics: 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.
• 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 wavefronts. 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

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 the photoelectric effect
• Matter waves-wave nature of particles, de-Broglie relation

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 Nuclear force

• Mass-energy relation, mass defect, 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.

CBSE class 12 physics practical syllabus 2020-21

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

• Record of at least 8 Experiments [with 4 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 demonstrated by the teacher

PRACTICALS (Total Periods 60)
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.

CBSE class 12 physics practical marks distribution

(Evaluation Scheme)

Time Allowed: Three Hours Max.Marks: 30

Experiments SECTION–A
1. To determine the resistivity of two / three wires by plotting a graph for potential difference
versus current.
2. To find the resistance of a given wire / standard resistor using metre bridge.
3. 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.
4. To compare the EMF of two given primary cells using a potentiometer.
5. To determine the internal resistance of a given primary cell using a potentiometer.
6. To determine the resistance of a galvanometer by the half-deflection method and to find its
figure of merit.
7. 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.
8. To find the frequency of AC mains with a sonometer.

Activities

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 a 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 wire for a steady current.
6. 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.

SECTION-B
Experiments
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 convex mirror, using a convex lens.
3. To find the focal length of a convex lens by plotting graphs between u and v 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 diode in forward bias and
reverse bias.
9. To draw the characteristic curve of a Zener diode and to determine its reverse breaks
down voltage.

Activities

1. To identify a diode, an LED, a resistor and a capacitor from a mixed collection of
such items.
2. Use of 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.
3. To study the 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 (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).
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 an 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 Coulomb’s law.
8. 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.
9. To study the earth’s magnetic field using a tangent galvanometer.

Edu Gyan