## Tuesday, January 28, 2014

### 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

[caption id="attachment_2701" align="aligncenter" width="433"] Double Folded Resistance coil[/caption]

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.

## Monday, January 27, 2014

Hello Dear Students of Class XII.

The practical exams begun and most of you are attending the Viva Voce for the first time. Sharing your experience would be a nice idea. It will help your friends all over to have an idea about the nature of experience you had and prepare accordingly. Though every examiner is unique, there are some common factors and pattern. You can share your experience as comments to this post.

Caution! The comments are published only after scrutiny. Do not try to put in spam - it won't work!

Note: -

Viva voce is a Latin phrase literally meaning "with living voice," but most often translated as "by word of mouth."

Why preparing for Viva is important?

Viva is a word of mouth confirmation of your abilities and knowledge. It is connected in association with practical examination at plus two level. Preparing well for the Viva will give the training for future Viva and interview which you will be giving later in your life. It is an opportunity for self examination too.

So, prepare well, sharpen your knowledge and excel in your Viva Voce!

## Sunday, January 26, 2014

### Latest Board Sample Papers and Guess Papers

Hi!
Now is the time to buy sample question papers and Guess papers to excel in Board Exams. Just click the link below and you can buy CBSE Sample Papers and Guess papers at lowest price. There a wide range of them and you can select the ones of your choice.

## Sunday, January 19, 2014

### The Exams are near! Start Smart Preparation (Not just hard work!)

Exam are near. CBSE Exams starts from 1 March. The candidates need to be on toes to score well.
Smart work is better than hardwork. Just burning midnight oil alone won't work.
Nobody plans to fail, but fails to plan. A failure to plan well may result in ultimate failure. So planning the work based on your target is the essential step to start with. So, fix your targets depending upon your abilities.

As per the current trend, a student can get 100% score in any subject - even in languages and subjects under humanities.

Don't worry even if you were scoring low marks throughout the year. Start now!
Have a look at the syllabus and previous question papers. Understand the pattern of question paper. Make a plan to score the MAXIMUM. Take guidance from your teachers (or the experts in the field).
Make a time table as per the guidance and stick to the time table.

Work smart and score well.
All the best!

## Saturday, January 18, 2014

### How was CBSE's PSA Exams?

How was CBSE's PSA Exams?

The PSA exam, previously optional has been made mandatory from this year. The marks will be considered under the CCE scoring system for Class 9, while Class 11 students will receive certifications. Class 11 students have raised strong objections that the question paper based on Science subjects is unfair for students who do not have science subjects. Authorities, on the other hand, maintain that the science topics included in the PSA question paper are from Class 10 level. Students still feel they will have an added disadvantage as compared to Science stream students that have been studying science regularly.

The exam for the year 2013-14 was conducted today. How was the exam?