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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.

(To be continued/ updated)

 

BOARD QUESTIONS FROM WAVE OPTICS (CBSE/AISSCE)

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

 

Answer

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.

pendulum-pseudo-force

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

Physics Video Project

The video project was given in 2008 for XI class students of Meghalaya. The best video among them is posted here. Though there are some errors, the video is inspiring to note the work done entirely from scratch by the XI Class students.

Speed of Light – a thought experiment

Suppose that you are a person 1 standing on a planet.You could see a person 2 moving in a space craft.2 has a mirror(on the surface of planet) exactly at is down which is moving exactly with the same speed that space craft is moving(and also,the line of translatory motion of both the craft and mirror are parallel to each other).If 2 has shot a beam of light from the bottom of space ship,as the mirror is moving exactly with the space craft;for 2,the path of light is straight line and gets reflected back along the same path in time t.If you are observing the whole thing from the surface of planet,for spaceyou,the path of light would obviously be ‘V’ shaped(let the time taken be t’).As the ‘V’ shaped path is longer than straight path and speed of light is same for observers,the time measured by 2 is obviously not the same as you measure.If you are considered to be reference frame,will the clock of 2 appear to be moving slower than yours? (Asked Charan)

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