Watch America’s Funniest Videos explaining some Principles of Physics
How was your CBSE/AISSCE 2014 Physics Exam?
Was it easy, difficult or moderate?
Were there any questions outside syllabus?
Were there any confusing questions?
Were there any errors in question paper?
Let your voices be heard before finalizing the marking scheme.
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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.”
The formula I gave them and which fetched them good marks is listed below.
- 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.
- Write all formulae with explanation of each term in a paper. Use them to solve atleast five numericals from each chapter.
- 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.
- Practice all diagrams
- 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
Q1. Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,
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
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.
We browse the internet to find out useful website for the learners. One such website we found today
You can download study materials, attempt tests online, download E-Books and many more. Make a visit now!
Significance of Infinity in Physics and Life
RKDas (MSc- Physics, Banaras Hindu University, India)
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”