PCM Encyclopedia

Home » PCM

Category Archives: PCM


Marking Scheme & Solved Board Paper 2015 for Class X/XII CBSE (All Subjects Board Examination 2015)


Important information for the students who gave maths paper 2016 CBSE

Central Board of Secondary Education 
Shiksha Kendra, 2, Community Centre, Preet Vihar, Delhi-110 301 
Important Information

The CBSE class XII mathematics paper was held on 14th March 2016. The feedback received from various stakeholders including students, subject teachers, examiners will be placed before the committee of subject experts and the board will take remedial measures before evaluation.
Public Relations Officer

For Original Copy of this Notice Please refer to this site

It is really a happy time for all those students who gave maths paper on 14th march 2016 CBSE BOARD.

CBSE 2015 result………..class 12 and class 10

CBSE class 12th results are usually announced in last week of May or early June. The CBSE results are announced for the 12th standard examinations conducted by the Central Board of Secondary Education.

Expected date is 20 March.

This time the CBSE 10th Results for 2015 will be announced on May 15. Students can be accessed it from many portals dedicated to the announcement of CBSE 10th results in 2015. The results are usually on a 10 point scale and a combination of the student’s performance in the school internal exams and the external boards. This year the CBSE 10th results will be of relevance to any student looking to decide on the stream to opt for in 2015.

Important Information about Class 12 Mathematics Paper of 2015 by CBSE

Important Information

The CBSE class XII mathematics paper was held on 18th March 2015. The feedback received from various stakeholders including students, subject teachers, examiners will be placed before the committee of subject experts before finalising the marking scheme to be followed for evaluation. All possible efforts will be made to protect the interest of the students.

Click here to See PDF…..

Chemistry Sample paper 2015 CBSE BOARD original sample (everyone must have to do before exam)

If you want to prepare yourself for CHEMISTRY EXAM in CBSE BOARD Exam 2015 you must have to do this sample paper. This is original sample paper issued by CBSE BOARD.

Click here to Download the pdf of Sample paper.

For more Sample paper. Please Click here….

Question Bank of Chemistry for Class 12 CBSE Board 2015

A huge collection of chemistry question for class 12 CBSE board for 2015 Board Exams

Q.1 Why is Frenkel defect defect not found in pure alkali metal halides?
Q.2 Although Si is an insulator, then how does it behave as semiconductor upon heating ?
Q.3 In the mineral ‘Spinel’ having the formula MgAl O2 4, oxide ions are in ccp arrangement,
 (a) What percentage of tetrahedral void is occupied by 2 Mg + ions?
 (b) What percentage of octahedral void is occupied by 3 Al + ions ?
If you want more question…….
Please CLICK HERE to download full pdf of HUGE Collection of Questions.\

…ALL the best for CBSE BOARD EXAMS 2015.

Question Bank of physics for Class 12 CBSE Board 2015

A huge collection of physics question for class 12 CBSE board for 2015 Board Exams


1. Where the energy of capacitor does resides?
2. Do electrons tend to go to region of low or high potential?
3. What is the net charge on the charged capacitor?
4. A Gaussian surface encloses an electric dipole within it. What is the total flux across
If you want more question…….
Please CLICK HERE to download full pdf of HUGE Collection of Questions.\

…ALL the best for CBSE BOARD EXAMS 2015.

Topics which has been deleted from Physics Syllabus Class 12th 2015

Some topics has been deleted and some topics has been added so please take a look here for these topics -:

Deleted Topics (dont study them) -:
Transistor as an oscillator, transistor as switch, atomic masses, isotopes,isobars,isotones,human eye, Image formation and accomodation, correction of eye defects, van de graaff generator.
Added Topics -:
Basic Ideas about Internet, Mobile Telephony, Global Positioning System (GPS).
Download Added Topics PDF by clicking here.

CBSE Physics Syllabus for class 12th 2015 (latest updated)

              CLASS XII (2014-15) 
One Paper
Time: 3 hrs.
Max Marks: 70
No. of Periods
Unit I
Unit II
Current Electricity
Unit III
Magnetic Effect of Current and Magnetism
Unit IV
Electromagnetic Induction and Alternating Current
Unit V
Electromagnetic Waves
Unit VI
Unit VII
Dual Nature of Matter
Atoms and Nuclei
Unit IX
Electronic Devices
Unit X
Communication Systems

Unit I:
22 Periods
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).
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                                                                                           20 Periods
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                                               22 Periods
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.
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                                 20 Periods
Electromagnetic induction; Faraday’s laws, induced EMF 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                                                                                    04 Periods
Need for 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                                                                                                                25 Periods
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.


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 microscope and astronomical telescope, polarisation, plane polarised light, Brewster’s law, uses of plane polarised light and Polaroids.
Unit VII:  Dual Nature of Matter and Radiation                                                         08 Periods
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 and Nuclei                                                                                          14 Periods
Alpha-particle scattering experiment; Rutherford’s model of atom; Bohr model, energy levels, hydrogen spectrum.
Composition and size of nucleus, 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                                                                                            15 Periods
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, transistor as an amplifier (common emitter configuration), basic idea of analog and digital singals, Logic gates (OR, AND, NOT, NAND and NOR).
Unit X:   Communication Systems                                                                                 10 Periods

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. Basic ideas about internet, mobile telephony and global positioning system (GPS)

CBSE Class 12th Date Sheet (REVISED)

The revised scheduled for those subjects is as follows:

Subject          :           Revised Date

Painting (Code 049): April 18, 2015

Graphics (Code 050): April 18, 2015

Sculpture (Code 051): April 18, 2015

APP/ Commercial Art (Code 052): April 18, 2015

Psychology (Code 037): April 20, 2015

CBSE Class 12th exams to begin on March 2 will now come to an end on April 20. The official link for the revised date sheet is provided here: http://cbse.nic.in/attach/12d_2015.pdf