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Electrostatics : A Practice Test Paper – 1

Time: 45 min

Max. Marks: 25

1. How does the force between two point charges change, if the dielectric constant of the medium in which they are kept, increases? [1]
2. Name the experiment which established the quantum nature of electric charge. [1]
3. Ordinary rubber is an insulator, but the special tyres of aircrafts are made slightly conducting. Why is this necessary? [1]
4. Draw electric field lines around an electric dipole. [1]
5. What would be the work done if a point charge +q is taken from  a point A to B on the circumference of a circle with another point charge +q at the centre? [1]
6. Obtain an expression for the potential energy of two charges q1 and q2 separated by distance r in a electric field E. [2]
7. Define electric field intensity. What is its SI unit? What is the relation between electric field and force on the charge? [2]
8. Obtain an expression for the electric potential at a point due to an electric dipole. [3]
9. Sketch equipotential surfaces for (i) a positive point charge (ii) Two equal positive point charges separated by a small distance (iii) a uniform electric field. [3]
10. (a) State Gauss Law (b) Using it derive an expression for the electric field intensity at a point near a thin infinite plain sheet of charge. (c) A point charge of 2 microcoulomb is at the centre of a cubic Gaussian surface 9cm edge. What is the net electric flux through all the surfaces of the cube? [5]
11. (a) Define electric dipole moment. (b) Derive expression for electric field intensity of a dipole at a point on its axial line. (c) Two charges +10μ C and – 10 μ C are placed 5 mm apart. Determine the electric field at a point P 15 cm away from its centre O on a line passing through O and normal axis of the dipole. [5]

KVS Announces Exam Dates for SA II for IX and X and Annual exam for Class XI

Date Sheet for SA-II Class IX-2010-2011

EXAMINATION TIMING;

(i)         09.00 AM to 12.00 Noon

(ii)               15 minutes extra time is to be provided to the students for reading the question paper, hence Question Paper should be given to the students at 08:45 AM.

Annexure ‘B’

Date Sheet for SA-II for Class X (School based) – 2010-2011

EXAMINATION TIMING;

(i)         09.00 AM to 12.00 Noon

(ii)        15 minutes extra time is to be provided to the students for reading the question paper, hence Question Paper should be given to the students at 08:45 AM.

Annexure ‘C’

Date Sheet for Class XI Session Ending Exam-2010-2011

EXAMINATION TIMING;

(i)         09.00 AM to 12.00 Noon

(ii)        15 minutes extra time is to be provided to the students for reading the question paper,  hence Question Paper should be given to the students at 08:45 AM.

NOTE: Examination of subjects other than mentioned above, for example: Physical Education, Pol. Science, Sociology, etc. is to be conducted by the Vidyalaya on the dates decided by RO/KV.

CBSE Class XII Sample Papers Published recently

CBSE.NIC.IN

Physics – Paper-I |   Paper-II |   Paper-III

CBSE 2010 Marking Scheme (Science)

http://entrance-exam.net

• Download CBSE class 12 physics question paper 1
• Download CBSE class 12 physics question paper 2
• Download CBSE class 12 physics question paper 3
• Download CBSE class 12 physics question paper 4
• Download CBSE class 12 physics question paper 5
• Download CBSE class 12 physics question paper 6
• Download CBSE class 12 physics question paper 7

Physics Guess Paper – By: Mr. ASHIS KUMAR SATAPATHY		01 Feb 2011	Download Now Size: 107 KB Total Downloads: 54
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(These are just links to various sample papers and guess papers created by various authors and posted at the respective sites mentioned)

Class XII Physics :: How to prepare well in advance?

Learn thoroughly the first time you learn a new concept.

Suppose, the topic Kirchhoff’s laws is taught in class. Revise the topic the same day yourselves. Keep a paper and pen while you revise and jot down whatever you feel important.

• Please note that you cannot memorize derivations by reading. Write and practice the derivations.

Memorizing a derivation is like remembering the path to a new place. There is no need to learn each and every step by rot. Keep in mind the important milestones and curves. You should know where to begin, the important assumptions and considerations which make a twist in the process and the final conclusion. If you find a way like this for each derivation, you will find it easy to remember long derivations.

• While you practice keep a note on the points requiring special attention.
• Try to relate with your daily experiences and objects as an aid to memory.
• Ask doubts. If you have some doubt try to clear it by asking the teacher. Nowadays there are many alternatives also. You can post your doubts at plustwophysics.com and get the answer delivered to your email inbox.
• Use memory maps.
• Try to recall and write the derivations and laws without referring to text.
• Solve numerical problems related to the topic. Do not limit the number of numericals to 2 or 3. Solve as much as you can. For that you may buy a Numerical Problems in Physics book. Mark the difficult ones and ask your teacher for clarification and help.
• Read in advance. Donot wait to read the textbook until it is taught in class. Anticipate the topic to be taught in class and read in advance.
• Don’t use too many reference books. You can have maximum one textbook, one reference book and a numerical problems book. Keep an objective physics if you long for entrance exams.

All the best

How was AISSE (CBSE Class 10) 2010 Science Question Paper ?

26 March 2010 : Today CBSE conducted Science Exam for AISSE (CBSE Class X).

Some students responded that many questions were unexpected and unconventional.

What is your opinion?

• Was there any error in any of the questions?
• Was there any question out of syllabus?
• Was the paper lengthy?

Post your comments and reactions here as intense debate comments below.
You can also post the doubtful questions for discussion.

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