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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

AISSCE 2016 Physics Question Paper feedback

How was the CBSE Physics exam?
When the question was asked to teachers and students the response was a mixed one.

Not as expected

Time was not enough
Question paper was lengthy
1 and 2 marks questions were easy
Five marks questions were confusing

Etc … were some of the reactions
How do you feel?
How was the paper?

Respond now. Your response counts. It will also help the teachers and Principal to take up the matter to CBSE authorities.


Feedback Received

Very Easy but Very Lengthy

“I appeared yesterday for the respective exam. It was quite surprising for us to see the very easy Physics Exam! I myself had prepared hard for it but the exam was much lengthy especially 3 marks questions. I myself couldn’t attempt 10 marks which i had already realized were quite easy questions. But I  have to accept this disappointment now” – Shubham Dhingra

Focal length of convex mirror using convex lens

It is given that the image formed by the convex mirror should be at radius of curvature . Why it should?




I guess that the question is based on the experiment to determine the focal length of a convex mirror using convex lens.

Initially a convex lens is used to obtain a real image of a candle. (or pin if you are doing the experiment using the optical bench) Then a convex mirror is kept in such a way that the image is obtained on the same position as the object. This happens when the rays are incident normal to the mirror. The rays of light incident normal to the mirror are directed towards the centre of curvature. Since the image was formed by the rays which are now reflected normally, the distance between the convex mirror and the original position of image gives the radius of curvature.

Experiment for focal length of convex lens

See the diagram for illustration.

Numericals from Newton’s Laws of motion based on F=ma (For calss XI students of Kendriya Vidyalaya Pattom)

Download the questions and solve them and submit on or before 9 Oct 2014

  1. A force acts for 10 s on a body of mass 10 kg after which the force ceases and the body describes 50 m in the next 5 s. Find the magnitude of the force. [Ans: 10 N]
  2. A  truck starts from rest and rolls down a hill with constant acceleration. It travels a distance od 400 m in 20s. Calculate the acceleration and the force acting on it if its mass is 7 metric tonnes. [Ans: 2 m/s2, 14000N]
  3. A motor car running aat the rate of 7 m/s can be stopped by applying brakes in 10 m. Show that total resistance to the motion, when the brakes are on is one fourth of the weight of the car.
  4. In an Xray machine, an electron is subjected top a force of 10-23 N. In how much time the electron will cover a distance of 0.1 m,? Take the mass of the electron = 10-30 kg

What Extra Books shall I buy to excel in Class 12 Physics?

What Extra Books shall I buy to excel in Class 12 Physics?


First of all you should possess the NCERT Text Books. This is a must for Indian Students (Especially for those doing the CBSE syllabus and those who are into Indian Civil Services Exam)

Other than that, the following books are recommended for excellence in Board Examination as well as Various Entrance Exams.

  1. Physics for JEE Advanced
  2. Principles of Physics (Hallidey)
  3. Concepts of Physics – HC Verma
  4. JEE Mains Physics in 40 Days
  5. IIT JEE Physics : 35 Years Chapterwise Solved Papers 2013 – 1979 11th Edition




Have you downloaded the question bank cum study material for Class 12 Physics?

Have you downloaded the question bank cum study material for Class 12 Physics?

The following links will help you get all the necessary materials to get more than 60% marks in Physics.

Central Board of Secondary Education

Download it from here. 

  1. http://physics.2lv.in/class-12-physics-study-materials-free-download/
  2. http://www.plustwophysics.com/class-12-physics-sample-papers/
  3. http://physics.2lv.in/must-practice-questions-for-cbse-physics-class-12-solved/
  4. http://www.plustwophysics.com/important-five-marks-questions-for-class-xii/
  5. http://www.plustwophysics.com/collection-of-cbse-class-12-previous-question-papers/
  6. http://physics.2lv.in/class-12-physics-hots-question-bank-free-downlload/
  7. http://www.plustwophysics.com/class-xii-physics-sample-paper-for-aissce-2012-2/






Sl.No Unit VSA(1) SA I (2) SA II(3) LA (5) Total
1 Physical World& Measurement 2(2) 4(2) 3(1) ————- 9(5)
2 Kinematics 1(1) 4(2) 6(2) 5(1) 16(6)
3 Laws of Motion 1(1) 2(1) 6(2) ———– 9(4)
4 Work,Energy and Power 1(1) 4(2) 3(1) 5(1) 13(5)
5 Motion of System of Particles&Rigid Body 2(2) 4(2) 3(1) 5(1) 14(6)
6 Gravitation 1(1) 2(1) 6(2) —————- 9(4)
Total 8(8) 20(10) 27(9) 15(3) 70(30)

General instructions:

(i) All questions are compulsory.

(ii) There are 30 questions in total. Questions 1 to 8 carry one mark each, questions 9to18carry two marks each, questions 19to27carry three marks each and questions 28to30 carry five marks each.

(iii) There is no overall choice. However, an internal choice has been provided in one question of two marks, in one question of three marks and all three questions of five marks each. You have to attempt only one of the given choice in such questions

1. Name the fundamental force which is responsible for the stability of the nucleus. (1)

2. State the no. of significant figures in the following (more…)

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