How to get pass marks in Physics in days?

Some students asked me this. These were students who never passed in any of the Physics tests during the year when they were in class 12.

 

Now that the exams are near, they are eager to pass with least effort.

 

I consoled them, and said, “If you believe and promise to do what I say, you can get more than pass marks in just  days effort.”

 

They agreed.

 

The formula I gave them and which fetched them good marks is listed below.

 

English: Two students studying English at a Ta...

 

  1. There are some derivations and constructions which are commonly asked in exams. With the help of your teacher identify the portions and learn them well. Take atleast fifteen such portions. Write and practice. Remember, these five days can change your future for ever.
  2. Write all formulae with explanation of each term in a paper. Use them to solve atleast five numericals from each chapter.
  3. Write all laws and principles and learn them by heart.  Try to write from memory and make sure that you can do it without any mistake.
  4. Practice all diagrams
  5. Revise whatever you learnt

 

Here you go! Do the above with confidence. Practice well, avoid distractions. Eat healthy food. Pray and practice. YOU WILL WIN

 

 

 

Questions asked in Physics Viva Voce for Class 12 Physics Practical

Q1. Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,200,500,1000,2000,2000,5000 etc?

Ans: In this arrangement all natural numbers upto 10000 ohms (and above) can be realized.

1, 2, 2+1=3,2+2=4,5,5+1=6,5+2=7,5+2+1=8,5+2+2=9 etc

Try it yourself to get all numbers from 1 to 10000

Double Folded Resistance coil
Double Folded Resistance coil

Q2. Why wire is double folded in resistance box?

Ans: The resistance wires in resistance box and in standard resistances are double folded and then coiled so as to nullify the effect inductance. When double folded and coiled, in one half the current will be clockwise and in next half the current will be anticlockwise. Therefore, the magnetic induction created by one half will be cancelled by the other half.

Q3. we make coil of wire when finding resistance of wire through metre bridge ?

Ans: This is not correct. If it is to be coiled, it should be done as in Q1.

Normally the wire is stretched on a half meter scale and fixed with terminals (or arranged in some other manner)

If you feel that the wire need to be coiled, then take  care to avoid the magnetic effect.

 

Found on the net – Physics Catalyst

We browse the internet to find out useful website for the learners. One such website we found today

http://physicscatalyst.com/chapter.php

You can download study materials, attempt tests online, download E-Books and many more. Make a visit now!

Significance of Infinity

Significance of Infinity in Physics and Life
RKDas (MSc- Physics, Banaras Hindu University, India)

 

Goal:

 

T2i - Infinity

 

The author is trying to prove the existence of infinity and infinite energy in the entire universe. By doing so, he raises some basic questions against the profoundly established concepts of prevalent physics.

 

Introduction to Infinity
In Sanskrit, infinity is termed as ananta, which is something without any limit or end. It is synonymous with Sanskrit term puurna, the full and complete. There is a phonetically similar term apeiron in Greek that stands for potentially unlimited or indefinite.
A specific beauty of the concept of puurna is such that ‘even if a puurna is subtracted or taken out of the puurna, the remainder is but an unreduced puurna itself (puurnasya puurnam aadaaya puurnam eva avashishyate).’ Following the same ideology, a practical statement may be made: the infinity is a one single entity, if there are many infinities, where is the room for placing more than one such infinity? Possibility of multiple infinities defies the basic requirements of infinity, which is not finite or limited.

 

Review of Zero and Infinity
Zero is a number. The zero, just as a number does exist in reality. It is such a small number or the smallest possible quantity that it is equal to nothing. Zero is an imaginary concept. In reality, ‘zero content’ does not exist; the zero is a no entity; the zero is without a true existence. There is no true zero. Zero is like a pure untruth.
Zero is a greatly useful tool for arithmetic operations. Continue reading “Significance of Infinity”

How was your AISSCE CBSE Class 12 Physics Exam 2013?

 

How was the CBSE Class 12 Physics Exam today?

 

Central Board of Secondary Education

 

Was it easy or difficult?

Many students reported that the questions were unexpected and extra ordinarily tough. What was your experience?

 

Were there questions beyond your comprehension?

 

Were there questions out of Syllabus?

 

Post your responses Now!

Anju R  writes:

Hi,
The Physics CBSE exam was tough.It was not beyond the syllabus but it was confusing and was asked in a twisted manner.Almost all the students who prepared for the exams didnot leave any derivations,laws etc.But the saddest part was that they asked the big derivation for just one mark and only very few were asked.And most questions were unexpected ones.
It was painful when I saw that after the exam almost all the students were crying.Sitting for a whole night for studying the derivations,laws etc.. gave nothing to us other than tears.We were happy after the English exam but the Physics exam gave a terror over us about Board Exams.I think 90 %  of the students could not complete saying that it was a lengthy paper.

The preliminary examination of the All India P...

During the exam I could see many sitting with great confusion while few others in a hurry to complete  it and the rest of them sitting sadly.By the grace of God I completed 5 minutes before the alloted time and didn’t leave any question.I hope CBSE will consider us.

Yours sincerely,
Anju.R

 

 

 

 

 

Faster than Light!

Mathew Abraham (A Physics Teacher in KVS) claims (on FaceBook) that faster than light communication and transfer of matter is possible and the fact will be revealed in near future.

See the transcript below.

 

I believe and maintain that “faster than light communication and transfer of matter is possible”. We have to find how?

  • Vishnu V Mohan Maybe communication.But wat abt matter?
  • Mathew Abraham It’s somewhat like a revelation to me, I hope that particles travelling faster than light would soon be discovered and that discovery would lead to interstellar travel in near future

    What do you think?

 

Physics Musings on Beer

Do you know there are a lot of Physics facts hidden behind a glass of beer.

 

beers

 

Institute of Physics (UK) has launched a Christmas website based on beer, to help explain some of the more peculiar scientific phenomena hidden in a glass of beer.

 

http://www.physics.org/cheersphysics/

 

The site explains many facts of Physics too based on the beer story.

 

It says that the bubbles are not rising but they are constantly falling in a g;ass of beer. Can’t believe? Visit the site to know more.

 

 

Just login! The site turns wonderful!

Hi!

Do you find the site just monotonous and garby?

Just login and see the difference!

It just turns beautiful.

Try now!!!

Class 12 physics question bank

Download an excellent collection of questions with answers for CBSE Class 12 Physics

Question Bank in Physics Class XII

The collection will also be helpful for students of other syllabuses.

Central Board of Secondary Education

The file consists of syllabus, key points, collection of very short Answer (1 mark), Short answer type question – solved (2 marks), short answers (3 marks), Long answers (5 marks), Solved numericals and 3 sample papers.

The contents are arranged chapter-wise. Any student will find this a boon for easy preparation and to score better marks in Physics.

Alternating Current and Direct Current

AC/DC (electricity)

Electricity is the most widely used form on energy because it is most efficiently distributed and transported. Also it can be easily converted to other forms of energy like mechanical energy, heat energy etc. Also since it is one of the fastest forms of usable energy it is used in logic digital circuits for computation since it gives the fastest results. It is this versatility of electricity that makes it so useful for modern life.
Of course electrical energy has various forms as well. It can be stored charge, alternating current or direct current. Each of these forms of energy have different advantages. Now we know that most  of power that we get in our homes is in the form of AC. However it is not necessarily the most used form of energy. In fact most electronic equipment use DC power and converts AC from the supply to DC. Then why is it made AC in the first place. Let us discuss that shall we?

Continue reading “Alternating Current and Direct Current”