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Monthly Archives: January 2014

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ELECTRONIC DEVICES-I

Semiconductor Devices is one of the important and easy units in class XII CBSE Physics syllabus. It is easy to understand and learn. Generally the questions asked are simple.

The unit carries 7 marks. In order to help you prepare this unit, I started a series of posts with a plan to cover all the important parts in the unit for you use.

To begin with the easy thing first, I posted Logic Gates as a part of the MLL (Minimum Level of Learning).

The present post covers semiconductors & pn junction.

Learn the article given herein thoroughly putting in enough written practice.

Do draw neat diagrams.

GET STARTED:

Click below to begin.

Electronic devices

HAPPY LEARNING!

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Set your priorities right………. A Short Story………

Dear Students
Here is a story I would like to share with you as you use the internet for this blog. I read it over 30 years ago and feel this is the most appropriate time to share it with you.
‘Virtue’ (good habits) and ‘Vice’ (bad habits) were identical twin sisters. In early childhood, they could be differentiated by different clothes they wore. Once the twins went to take a bath in a river. They left their clothes on the riverside. Vice came out first. True to her name, she thought of a mischief and wore her sister’s clothes and left. When Virtue came out, she has no choice but to wear the clothes left by Vice. The two have never met since and appear to have deceptive looks.
 
What appears to be Virtue or Vice may actually not be so.
It is important for each one of you to look beyond appearance.
 
The Message: You may find the use of the internet for different social contact fun, but it is very important for you at this stage to stay focused and shun all distractions like Facebook, Twitter etc.
 
Happy Learning!
 

LOGIC GATES

Semiconductor Devices is one of the important units in class XII CBSE Physics syllabus. It is easy to understand and learn. In general the questions asked from this unit are simple.

The unit carries 7 marks. In order to help you prepare this unit, I am starting a series of posts and plan to cover all the important parts in the unit shortly in subsequent posts.

To begin with the easy thing first, I am posting Logic Gates as an important part of the MLL (Minimum Level of Learning). A 2 to 3 marks question can be expected from this sub-unit in the CBSE exam.

The post also includes some problems from CBSE papers. Do scan NCERT textbook for additional questions on Logic Gates. Feel free to send your feedback.

GET STARTED:

CLICK BELOW TO BEGIN.

LOGIC GATES post

HAPPY LEARNING!

P. S.: Please note that the original file has been replaced after deleting Q. No.4

Communication Systems-II

In continuation with Part-I of the Unit Communication Systems in CBSE class XII syllabus, the second & the final part II is being posted.

Please go through the lesson carefully and put in enough written practice followed by practicing C. B. S. E. previous years problems.

Click below to continue.

Communication Systems-2

HAPPY LEARNING!

COMMUNICATION SYSTEMS – 1

This last unit in the CBSE class 12 syllabus carries 5 marks and has a special advantage that generally direct questions are asked in this unit. The numerical problems in this unit are also very simple.The lesson has been specially written in a different format with an aim to achieve SELF LEARNING through FORMATIVE ASSESSMENT at different stages as you go through the lesson.

To facilitate learning, the lesson has been divided in two parts Part I is being posted now and Part -II will be posted shortly.It is suggested to go in for careful reading followed by written practice to reinforce learning through a question bank which will be sent on request.Do go through previous year questions also to get an idea of the type of questions asked in the examination. The 5 marks may be all yours.

CLICK BELOW TO BEGIN.

COMMUNICATION SYSTEMS-I 

Get going!

All the best!

Galvanometer

In continuation with the earlier parts of the Unit, Magnetic effects and magnetism, another simple but very important topic Galvanometer is being posted for your benefit.

The post contains the principle, construction and working of the galvanometer. This article on moving coil galvanometer is important and may be asked as a direct question.

In addition , it contains two sub-parts on conversion of galvanometer to ammeter and voltmeter.

Simple numerical problems are generally asked on these topics.

In order to reinforce understanding, sample problems on the conversions have also been included.

CLICK BELOW TO CONTINUE.

Galvanometer

 

Please remember the importance of written practice and previous year questions based on these topics.

Feel free to send any queries regarding the blog. Telephonic queries are also welcome. For details, click CONTACT button on top of the blog.

HAPPY LEARNING!

Magnetic Effects 1

Ampere’s Circuital Law and its applications.

Click below to continue.

Magnetic Effects 1

The derivations herein and previous year questions based on these should be practiced.

BIOT-SAVART LAW

This article has 2 important derivations. These derivation or simple numerical problems based on these may be asked in the examination.

Biot-Savart law

HAPPY LEARNING!

CYCLOTRON

A VERY IMPORTANT TOPIC!

Generally asked as a 5 marks question in CBSE exam.

You are advised to go in for written practice. Do try drawing the diagram.

Click below to begin.

CYCLOTRON

HAPPY LEARNING!

A C CIRCUITS 3 : Series LCR Circuit & Transformer

I am uploading the last part of  A C Circuits. Two articless: Series LCR circuits & Transformer have been discussed in this part.

Series LCR ,

TRANSFORMER

Both are important from examination point of view. Do not forget to practice diagrams. Follow up by trying Previous year questions. You may write to me in case you need practice questions on this unit. HAPPY LEARNING!