Physics beckons

Home » 2014 » February

Monthly Archives: February 2014

Advertisements

Performance Boosters-II(Without extra effort) & Best Wishes

Click below and read on….

Best Wishes

Advertisements

Formula for electric power?….A good question……

Sir, what is the difference between the formulas P=(I*I)R and P=(V*V)/R? On what context do we use the two?….A question by Rajit Roy.

This is a very good question and I thought of sharing the answer with you all.

The relation I^2R implies P proportional to R and is used when I is constant e.g. in a series combination of resistances I is same thro’  all the resistances.

V^2/R is used in a parallel combination of resistances. In this case V is constant and hence power is inversely related to R.

P.S. :Use I^2 R for power loss in transmission.

Towards Examination with Confidence (Reinforcing Learning-V)

In order to give you a clear idea of the type of questions asked in the CBSE examination and the model answers  thereof, a few previous years  CBSE papers will be posted.

The important topics covered in each paper will also be listed.

The fifth in the series is  CBSE Physics (AI 2010) Paper.

The important topics covered in this paper are:

Moving Coil Galvanometer: its conversion to ammeter and voltmeter, Transformer, Faraday’s laws,LED, pn junction characteristics, Telescope,Microscope.

Go through the answers carefully.

Don’t forget the importance of written practice.

Click below and start!

AI-2010

You may share the link to the blog with your friends of class XII.

HELPLINE No: 91-7838849939 (Between 1800-1900 hrs IST only)

Happy Learning!

Towards Examination with Confidence (Reinforcing Learning-IV)

In order to give you a clear idea of the type of questions asked in the CBSE examination and the model answers  thereof, a few previous years  CBSE papers will be posted.

The important topics covered in each paper will also be listed.

The fourth in the series is  CBSE Physics (Delhi) 2010 Paper.

The important topics covered in this paper are:

Transistor as an Oscillator, Difference between Conductors, Insulators & Semiconductors, Diffraction at a single slit, Compound miroscope, Series LCR Circuit, Potentiometer, Photo diode, Radioactive Decay Law, Energy stored in a capacitor.

Go through the answers carefully.

Don’t forget the importance of written practice.

Click below and start!

Delhi-2010 

You may share the link to the blog with your friends of class XII.

HELPLINE No: 91-7838849939 (Between 1800-1900 hrs IST only)

Happy Learning!

Performance Boosters: (Without extra effort)

Yes, You got the heading Right!….

Now Click below and read on…

1. POSITIVE THINKING: Believe in yourself because…

If you think : You CAN; you are RIGHT….

If you think : you CAN’T: you are RIGHT AGAIN….

So belong to the Former class.

2. The Crucial FIFTEEN MINUTES: The CBSE has made a special provision for 15 minutes reading time before you start answering the questions. Utilise this time to your fullest advantage. Read the questions very carefully during this time.Try to understand the questions to be answered in letter & spirit.

Clearly mark what has been asked.

Rule out what has not been asked.

Decide which of the choices offered in a question are you going to attempt.

Answers should always be to the point. Make sure that the answer to every  part/ sub-part is separately visible for easy evaluation.

3. Spend two minutes on the clip below:

To be continued……..

Back to work!

Happy Learning!

 

Towards Examination with Confidence (Reinforcing Learning-III)

In order to give you a clear idea of the type of questions asked in the CBSE examination and the model answers  thereof, a few previous years  CBSE papers will be posted.

The important topics covered in each paper will also be listed.

The third in the series is  CBSE Physics (Foreign) 2013 Paper.

The important topics covered in this paper are:

Transistor Characteristics, Zener diode as a Voltage regulator, Intrinsic & Impurity semiconductors, Diffraction at a single slit, Lens Makers’ Formula, Brewster’s law, Mutual inductance, Series LCR Circuit, Meter bridge, Compound Microscope, Refracting & reflecting type telescope, Radioactive Decay Law, Alpha particle scattering, Energy stored in a capacitor, Compound microscope.

Go through the answers carefully.

Don’t forget the importance of written practice.

Click below and start!

Foreign-2013

You may share the link to the blog with your friends of class XII.

HELPLINE No: 91-7838849939 (Between 1800-1900 hrs IST only)

Happy Learning!

How to get 90+ in boards?

This is in response to a question asked by one of the curious followers of the blog. I thought of sharing the response with you all.

1. I appreciate & salute the question asked as it reflects the desire to perform and excel.
2. With the syllabus now over; revise one unit at a time. Remember; written practice of statement of laws; definitions; derivations; drawing neat diagrams is an essential part of the revision.

3. Read Summary & Points to Ponder listed at the end of each unit of the NCERT text book.

4. The unit revised needs to be practiced with previous year Real Questions from CBSE papers. The same are available in all good books. Make sure, you choose a book in which the answers are well written.

5. Give yourself a test. For the purpose; select any two previous year papers at random & test your preparation by solving the relevant questions from the papers selected. It will be good if you get the test evaluated.
6. Finish all the units well in time; say by March o1, 2014.
7. Follow up revision through CBSE/Sample papers from some good book.
8. Remain focused and relaxed during preparation. Avoid last minute nervousness.
Remember: A cool head is an asset in the examination hall. It helps you apply your knowledge in new and unfamiliar situations which a typical question may offer.
Happy learning and best wishes!

Towards Examination with Confidence (Reinforcing Learning-II)

IMPORTANT: Please note the following corrections in solution of Delhi 2011 paper.

ANS.9. The torque should be p E sin 30 degree. The ans should be accordingly modified. 

Q. 13. In the diagram , the NOR gates have been erroneously  drawn as NAND gates.

In order to give you a clear idea of the type of questions asked in the CBSE examination and the model answers  thereof, a few papers from previous years will be posted.

The important topics covered in each paper will also be listed.

The second in the series is DELHI CBSE Physics 2011 Paper.

The important topics covered in this paper are

Young’s Double slit Experiment, Laws of Refraction (Huygen Principle), Polarisation of Light, Lens Makers’ Formula, Prism Formula, Total Internal Reflection, Magnification by Spherical Mirror, Cyclotron, Biot Savart Law, Transfomer, Series LCR Circuit Propagation of EM Waves, Radioactive Decay Law, Drift velocity, Gauss Theorem, Zener diode as a Voltage regulator.

Go through the answers carefully.

Don’t forget the importance of written practice.

Click below and start!

del 2011

You may share the link to the blog with your friends of class XII.

HELPLINE No: 91-7838849939 (Between 1800-1900 hrs IST only)

Happy Learning!

Towards Examination (Reinforcing Learning-I)

In order to give you a clear idea of the type of questions asked in the CBSE examination and the model answers  thereof, a few papers from previous years will be posted.

The first in the series will be All India CBSE Physics 2011 Paper.

The important topics covered in each paper will also be listed.

The important topics covered in this paper are 

Interference, Diffraction, AC generator, Moving Coil Galvanometer, Solenoid, Toroid, Full Wave Rectifier, Binding Energy curve, Displacement Current, Force between Current carrying conductors.

Go through the answers carefully.

Don’t forget the importance of written practice.

Get started!

HELPLINE No: 91-7838849939 (Between 1800-1900 hrs IST only)

Click and go.

2011 AI

Happy Learning!

Value Based Questions

The CBSE Physics Class 12 paper contains a 3 marks value based question. A part of the question can be answered by just carefully reading the question and identifying the values involved. such questions may not have a unique answer.

This question must be attempted by every student and may help you secure 2 marks.

To give you an idea of the value based questions, here is a list of a few solved questions.

For your practice, a few unsolved questions are also included.

Click below for the questions.

value based

Happy Learning!