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# Tag Archives: solved problems

## Want to pass the CBSE Physics Exam? Here’s how !

Did you get very low marks in Physics and finding it too difficult to get pass marks?
Here is a systematic and easy to follow plan to succeed. Just believe me, you can get pass mark by following the instructions religiously.

## 1. Don’t leave a single question.

During the cool off time go through all the questions and decide the questions known well to you and mark them to attempt in the first round. Then have a look at the questions which may take some time to solve or of which you have some idea but the answer is not completely known. The rest of questions can be kept for third round where you will write an answer with the concepts known to you based on the hints which you may get from the question itself.

Attempting all questions is very important, because if you write an answer there is a chance to get some marks but if you do not write there is no chance of getting any mark for the question.

## 2. Practice the frequently asked portions

Please go through “MUST PRACTICE PORTIONS FOR CLASS XII” and practise the portions thoroughly.

## 3. Practice the Diagrams

You can find a list of important diagrams here shortly.

1.  Electric field lines due to a points charge, a dipole, two negative charges, two positive charges etc.
2. Electric field due to a dipole (axial position and equatorial position) diagram for derivation.
3. Torque on a dipole in a uniform electric field
4. Equipotential surfaces due to a point source, a line of charge and an electric dipole.
5. Combination of resistors (in series and in parallel)
6. Combination of cells. (diagram for derivation)
7. Cyclotron
8. Motional emf
9. Mutual inductance of two solenoids
10. AC generator
11. AC circuit with R only
12. AC circuit with L only
13. AC circuit with C only
14. LCR AC series circuit
15. Impedance diagram
16. LC oscillations
17. Resonance in LCR series circuit
18. Transformer
19. Displacement current
20. Ray diagram for image formation by Simple Microscope
21. Ray diagram for image formation by Compound Microscope
22. Ray diagram for image formation by Telescope in normal adjustment
23. Ray diagram for image formation by Telescope when final image is at the least distance of distinct vision
24. Prism formula
25. Laws of reflection using Huygen’s wave theory
26. Laws of reflection using Huygen’s wave theory
27. Experimental arrangement for Young’s double slit experiment
28. Expression for fringe width in Young’s double slit experiment
29. Diffraction at a single slit
30. Binding Energy per nucleon vs Mass number graph
31. Distinction between conductors, insulators and semiconductors on the basis of energy band diagram.
32. PN junction diode characteristics (circuit diagram and graph for forward bias and reverse bias)
33. Half wave rectifier
34. full wave rectifier
35. zener diode as voltage regulator
36. Transistor action
37. Transistor characteristics in CE configuration (input characteristics and output characteristics)
38. Transistor amplifier in CE configuration

40. All Block diagrams from Communication (posted below)

## Resistance and Resistivity

“Two wires A and B of equal lengths,different cross-sectional areas and made of same metal a)name the property which is same for both the wires. b)name the property which is different for both the wires”

Since both the wires are of same metal, the resistivity will be same for both whereas since the dimensions (Area of cross section here) are different, the resistance will be different

## Amateur Research

Ask Physics is looking for students from Kendriya Vidyalayas of Kerala who are interested in doing Research in any branch of Science.

You will be contacted by the concerned official.

## Optics

“when we exchange the lenses of compound microscope, then why it does not act as a telescope?”

## Sequence of Learning Physics

In what sequence should these chapters be prepared for my exams:-
units and dimensions,kinematics,laws of motion,work power and energy,motion of system of particles and rigid body dynamics,gravitation.

It is better to follow the same pattern as given in NCERT text book

## Problem from Kinematics

The speed of a train changes from36km/h to 72km/h in 10sec. calculate the distance travelled during this time

u=36km/h = 10 m/s

v=72 km/h=20 m/s

t=10 s

S=?

use v = u+ at to find a

a = 1 m/s2

Use v2-u2=2aS to find S

S = (400-100)/2 = 150 m

Ask Physics has installed the Latex server and now users can type latex code to insert complex equations to their comments or questions.

If you are not familiar with latex code, use the following site to generate the code for the equation that you need.

http://www.codecogs.com/latex/eqneditor.php

When you visit the above site you can edit and view the result of the code generate. You have the option to copy the image of the equation or to copy the code itself (what you typed for getting the image equation; not the html code supplied) and paste the code in your comment.

Go, Try it Now!
$(a+b)^{2}=a^{2}+b^{2}+2ab$