The admit cards for the JEE Main 2015 Exam have already been released. The exam itself is less than one month away. Surely, you must have a lot of questions about how to prepare for the various sections of this exam. In this article, let us understand how to prepare for the Physics section of this exam.
Physics is a conceptual subject. In Physics, many a time, you would encounter questions which test your knowledge and understanding of concepts. As you all have studied for the theory paper in your boards, your fundamentals of the subject must be quite clear. Here are a few tips to effectively apply the concepts and quickly solve the Physics questions in your entrance test.
Know the laws: It is of utmost importance to know the laws of Physics as well as their derivatives. You should be familiar with all the forms of the formulae derived from a law. Sometimes you are asked to find an entity which cannot be directly found out by applying a formula. In that case, if you use the various forms of a formula and use other related entities, the question would become easier to answer. For example, the tangent galvanometer formulae,
B = Bh tan (theta).
From this, you can expand Bh to its formula involving current (I) and number of turns. Further simplification gives you the formula of Reduction factor (K).
Know the constants: You should know the values of the constants by heart, including their units in SI as well as CGS. They help you in quick calculations. Most of the times, the values are given in the question itself. In case they aren’t, knowing them becomes handy. Gravitational constant, Planck’s constant, Boltzmann constant, mass of electron, proton neutron, Stefan’s constant, etc. are some of the most important constants. Also know the values of square roots of two, three, some constantly appearing log values, fractions, reciprocals, etc. These will help you reduce the calculation time.
Some do or die chapters: Current electricity, Magnetic effect and Magnetism and Electrostatics are the chapters from where most of the formula based sums come from. Heat and Thermodynamics, Work Energy and Power, Wave chapters give slightly twisted questions. Physics of nuclei, Semiconductors, modern physics generally give factual questions. Hence, you need to prepare for these chapters while keeping in mind the kind of questions that come from these chapters. These chapters yield almost 80 percent of the questions that you would encounter in the Physics section of the test. Hence, prepare these chapters thoroughly.
The Physics section is often considered to be the toughest one. But if you approach these questions positively and know the concepts and formulae thoroughly, you will surely score well in this section.
All the Best!