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Nobel Prize in Physics 2017 goes to Rainer Weiss, Barry C. Barish and Kip S. Thorne

The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics 2017 with one half to

Rainer Weiss 
LIGO/VIRGO Collaboration

and the other half jointly to

Barry C. Barish 
LIGO/VIRGO Collaboration



Kip S. Thorne
LIGO/VIRGO Collaboration

“for decisive contributions to the LIGO detector and the observation of gravitational waves”






Very Important Portions for class 12 Physics for CBSE Board Exam 2017

Please revise these portions thoroughly

  • Electric Dipole : electric field due to a dipole on axial line and equatorial line, torque on a dipole in a uniform electric field, work done in rotating a dipole, potential energy of a dipole in a uniform electric field.
  • Gauss Theorem and applications
  • Metre bridge experiments, Potentiometer principle and experiments
  • Ampere’s circuit law and applications
  • MCG and conversion to ammeter and voltmeter
  • Cyclotron
  • LCR series circuit and resonance, expression for resonant frequency, Q factor, Power factor
  • Optical instruments (complete)
  • Theory of interference, Young’s double slit experiment, expression for fringe width, graph
  • LOGIC Gates (complete)
  • Electromagnetic spectrum, production and uses of em waves
  • Photo electric effect (compete: experimental setup for study of photoelectric effect, conclusions, Einstein’s equation and explanation to laws of PEE.)
  • BE per nucleon vs atomic mass graph and explanation to release of energy during nuclear fission and fusion.
  • CE transistor characteristics and CE transistor amplifier
  • Need for modulation
  • All block diagrams from “Communication”:
  • Total internal reflection and applications

Want to pass the CBSE Physics Exam? Here’s how !

Did you get very low marks in Physics and finding it too difficult to get pass marks?
Here is a systematic and easy to follow plan to succeed. Just believe me, you can get pass mark by following the instructions religiously.

1. Don’t leave a single question.

During the cool off time go through all the questions and decide the questions known well to you and mark them to attempt in the first round. Then have a look at the questions which may take some time to solve or of which you have some idea but the answer is not completely known. The rest of questions can be kept for third round where you will write an answer with the concepts known to you based on the hints which you may get from the question itself.

Attempting all questions is very important, because if you write an answer there is a chance to get some marks but if you do not write there is no chance of getting any mark for the question.

2. Practice the frequently asked portions

Please go through “MUST PRACTICE PORTIONS FOR CLASS XII” and practise the portions thoroughly.

3. Practice the Diagrams

You can find a list of important diagrams here shortly.

  1.  Electric field lines due to a points charge, a dipole, two negative charges, two positive charges etc.
  2. Electric field due to a dipole (axial position and equatorial position) diagram for derivation.
  3. Torque on a dipole in a uniform electric field
  4. Equipotential surfaces due to a point source, a line of charge and an electric dipole.
  5. Combination of resistors (in series and in parallel)
  6. Combination of cells. (diagram for derivation)
  7. Cyclotron
  8. Motional emf
  9. Mutual inductance of two solenoids
  10. AC generator
  11. AC circuit with R only
  12. AC circuit with L only
  13. AC circuit with C only
  14. LCR AC series circuit
  15. Impedance diagram
  16. LC oscillations
  17. Resonance in LCR series circuit
  18. Transformer
  19. Displacement current
  20. Ray diagram for image formation by Simple Microscope
  21. Ray diagram for image formation by Compound Microscope
  22. Ray diagram for image formation by Telescope in normal adjustment
  23. Ray diagram for image formation by Telescope when final image is at the least distance of distinct vision
  24. Prism formula
  25. Laws of reflection using Huygen’s wave theory
  26. Laws of reflection using Huygen’s wave theory
  27. Experimental arrangement for Young’s double slit experiment
  28. Expression for fringe width in Young’s double slit experiment
  29. Diffraction at a single slit
  30. Binding Energy per nucleon vs Mass number graph
  31. Distinction between conductors, insulators and semiconductors on the basis of energy band diagram.
  32. PN junction diode characteristics (circuit diagram and graph for forward bias and reverse bias)
  33. Half wave rectifier
  34. full wave rectifier
  35. zener diode as voltage regulator
  36. Transistor action
  37. Transistor characteristics in CE configuration (input characteristics and output characteristics)
  38. Transistor amplifier in CE configuration
  39. Download (PDF, 369KB)

  40. All Block diagrams from Communication (posted below)

    Download (PDF, 449KB)



Download the collection of questions asked in previous CBSE board exams from the chapter Wave Optics.

Practising the previously asked questions is a good idea to prepare for the exams.

Download (PDF, 607KB)

Newton second law and pendulum

A pendulum is hanged in the car.
Car starts to move by constant acceleration
How to measure acceleration by angle the pendulum?

Asked Afshin



If the pendulum makes an angle θ with the vertical, then a = g tan θ

This is based on the idea of pseudo force experienced by a body in an accelerated frame of reference.

When a body is in an accelerated frame of reference, it feels as if it is acted upon by a force equal to its mass multiplied by the acceleration of the system. Please have a look at the diagram below.


Please feel free to ask further doubts on the topic via comments

reference books for the preparation of NGPE (national graduate physics examination)

Name a few reference books for the preparation of NGPE (national graduate physics examination) at B.Sc. level

Asked Abhivyakti

Click on the links below to downloadngpe

NGPE Question Paper 2014

NGPE Solutions 2014

NGPE-2013 Question Paper: Download

Click here to see NGPE 2012 Question Paper

Click here to see Solutions NGPE 2012

Click here to see NGPE 2011 Question Paper

Click here to see NGPE 2011 Section A answers

Click here to see Solutions NGPE2011


The following Books are recommended

Other than your regular BSc textbooks on,

You can take these …

  1. HC Verma’s Concepts of Physics Volume – 1
  2. HC Verma’s Concepts of Physics Volume – 2
  3. Resnick Halliday Fundamentals of Physics
  4. Irodov’s problems in physics
  5. University Physics
  6. Physics Formulae

And there are many … Try these first

Work Energy Problem

A 2kg hammer with a speed of 40m/s strikes a 100g nail driving it into a wooden block. If there is no dissipation of energy in this process and the frictional force applied by the wooden block is 8000N, how deep would be nail penetrate into the block?

Asked Jaisy

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Half Yearly Exam Count Down

Half Yearly Exam Count Down KVS Ernakulam RegionOctober 17th, 2017
The Half Yearly Examination for Kendriya Vidyalayas of Kerala starts from 17 October 2017
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