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Some points of group 14..... 1) Dry ice (solid CO2) is a molecular solid (vander waal's solid) 2)Anthracite is the purest form of coal while lamp black is the softest 3)Tin is the element having maximum no. of isotopes 4)graphitic acid (C11H4O5) is obtained by oxdn. of graphite with conc. HNO3 5) water gas is also known as blue gas bcoz it burns with a blue flame 6)Quartz is the purest and very common variety of silica 7)Tin is nt attacked by organic acids and used in tinning of utensils
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submitted by chimanshu_007 (11504 m) on 22 May 2007 15:30:53 IST (12 comments 633 views)
Algebraic Graphs Conic Sections Pointx^2 + y^2 = 0 Circlex^2 + y^2 = r^2 Ellipsex^2 / a^2 + y^2 / b^2 = 1 Ellipsex^2 / b^2 + y^2 / a^2 = 1 Hyperbolax^2 / a^2 - y^2 / b^2 = 1 Parabola4px = y^2 Parabola4py = x^2 Hyperbolay^2 / a^2 - x^2 / b^2 = 1 For any of the above with a center at (j, k) instead of (0,0), replace each x term with (x-j) and each y term with (y-k) to get the desired equation.
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submitted by shubham_sachdeva (1874 m) on 19 Sep 2007 15:17:05 IST (2 comments 89 views)
An Analysis of the IIT-JEE The complexity of the IIT-JEE arises from the fact that the questions are always unique in their context, and solving them often requires a combination of concepts from across different chapters. Nonetheless, some basic data analysis can be quite revealing and could give some important insights into how one should go about preparing for each subject. Such analyses form the basis of our understanding of the JEE. The section-wise breakup of marks in the past four years (2001-2004) JEE Screening has been given below for your reference. PHYSICS 'Electrostatics and Current Electricity', and 'Electromagnetism'-each of these topics has contrib
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submitted by priyesh (1586 m) on 4 Jul 2007 19:22:05 IST (1 comments 253 views)
Course Planning Course planning is essential in the sense ,that it can get you at the top in rank list.This planning should be done by the student in 11th class itself . From this year, a screening test is being conducted and so proper planning becomes all the more important.Have a look at all the topics and shortlist topics,and months wherein you plan to complete them.Finishing syllabus atleast a month before the exam is essential.The summer vacations in 12th class are the best time to finish a huge lot of syllabus.I can suggest the following course plan for students in 11th class. JUNE TO OCTOBER : Mathematical concepts used in Physics, Basic mechanics, stoichi
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submitted by priyesh (1586 m) on 4 Jul 2007 19:18:02 IST (0 comments 150 views)
hey guys yesterday i was watching discovery channel and found some very important thing named " string theory " ...........if this theory become a success , quantum mechanics will be jst a hand full topic (wonder how it works) Think of a guitar string that has been tuned by stretching the string under tension across the guitar. Depending on how the string is plucked and how much tension is in the string, different musical notes will be created by the string. These musical notes could be said to be excitation modes of that guitar string under tension. In a similar manner, in string theory, the elementary particles we observe
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submitted by chimanshu_007 (11504 m) on 11 Jun 2007 11:24:23 IST (8 comments 258 views)
Evidence for the Structure of Atoms How do we know what the structure of atoms is like? Our current picture of the atom wasn't created all at once; it was built up and improved step by step based on experimental evidence and some extremely clever insights. Some ancient Greek philosophers speculated that everything might be made of little chunks they called "atoms." The name comes from a Greek word meaning "uncuttable"; atoms were supposed to be unbreakable, the smallest possible units of anything. In later centuries, scientists more or less left the atom idea on the shelf, until the early nineteenth century, when the ch
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submitted by pirate1_from_jee (596 m) on 20 Jun 2007 13:48:13 IST (1 comments 102 views)
hii friends... So, are you people all gathered to crack JEE .. ?? Well, as JEE is closing in I am sure many so you are tensed , some are nervous , some want to know how to score better .. and the list shall never end. Many of you keep asking me on my nudge-book ... well it is hard to reply there, so i have decided to post this article. Now, let me first all tell you as I always tell, do not think big of JEE. This is the mistake that many many people do and this """ BIGGG """ image of JEE kills people. Just take it easy, like any other exam it is also a exam where you are tested a bit more rigrously and the competition is a bit tough and thats it ..
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submitted by a4asd (312 m) on 6 Jun 2007 20:48:21 IST (1 comments 87 views)
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