TIPS That help u to CRACK IIT JEE

iit jee is considered as one of the most difficult exam after the 12th boards.It is the dream of every student to become an IITIAN .If u analyze the previous years papers and the students who get through then it shows that IIT JEE tests concepts ,if ur concepts are good then clearing IIT JEE wont be that difficult.

THE GOLDEN RULES THAT HELP U CROSS THE LINE
A pay attention on concepts,concepts are the key to success by concepts what i mean is that all u have to do is to understand exactly what a author wants to say in his book,if u misinterpret him it becomes a misconception.and that's the reason jee becomes difficult because the students are full of misconceptions.
B
solve less problems 25 to 30 problems per chapter are more than enough but solve quality problems.
C study the course in modules for example study one chapter in all three subjects each per two weeks,if the chapter is very small time could be less.

This is one such exam were hard work doesn't hold the key, u should have a good strategy ,finally u should have the right exposure so u don't feel nervous when u finally face the exam.

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Problems



1 Explain this phenomena using Bernoulli's theorem?

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2 ROPE BETWEEN INCLINES




A rope rests on two platforms which are both inclined at an angle θ (which you are free to pick), as shown. The rope has uniform mass density, and its coeffciient of friction with the platforms is 1. The system has left-right symmetry. What is the largest possible fraction of the rope that does not touch the platforms? What angle θ allows this maximum value?

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3
rahul and raghav are playing tug-of-war. rahul wins, pulling raghav into the mud puddle. Why did rahul win?

a)rahul exerted a greater force on the rope than raghav exerted on the rope

b) The rope exerted a greater force on raghav than it exerted on rahul.

c) rahul exerted a greater force on the ground than raghav exerted on the ground.

d) All of the above.

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Answer.
At the start everyone is at rest. For someone to win, there must be an acceleration from rest to initiate motion in one direction. This acceleration need not be large. During the acceleration there must be a net force on each person in the direction of the acceleration.
(a) and (b) are wrong because the rope has relatively small mass, so the tension forces at its ends are nearly the same size (F =ma where m is essentially zero). Certainly any small difference in tension between the two ends is nowhere near great enough to account for the outcome. The rope's mass is very small compared to the masses of rahul and raghav, so even when it accelerates (and so do they), the net force on the rope, F = ma, is negligibly small compared to the net forces on rahul and raghav. In fact, most of this game involves small accelerations.
(c) is correct. The net force on rahul that allows him to accelerate with respect to the ground is the force of the ground on his feet minus the force the rope exerts on him, the former being larger. The person with the better shoes, greater coefficient of friction at the ground underfoot, and foot control, wins. raghav also accelerates, because the force of the rope on him is larger than the force of the ground on his feet. The player wins who can maintain the largest force between his feet and the ground.

section-wise breakup of marks


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 contributed about 15% to the total marks in the past four years. Students should devote about 30% of their preparation time to the coverage of Electromagnetism and Electrostatics; because together they constitute almost one-third of the total marks and can be more scoring as the degree of difficulty when compared to Mechanics is relatively low.

'Optics' too contributes approximately 13% to the IIT-JEE test ,it has been observed that problems on Physical optics are more frequent than that on Geometrical optics. Students should take care to devote about 10% of time on Optics for robust preparation.

In the past four years, approximately 20% of the total marks pertain to Mechanics. Within Mechanics, the favorite topics seem to be 'Rigid Body Rotation' and 'Motion on a Plane'. Topics like 'Simple Harmonic Motion' and 'Work and Energy', on the other hand, have been accorded relatively less priority for these years. Apparently, students have to be thoroughly prepared with Mechanics as it forms almost one-fifth of the whole JEE Screening paper. It is important for students to realize that Mechanics though important, takes relatively more time for preparation. Thus, they should restrict their preparation of Mechanics to about 30% of the total time. The next important topics are 'Modern Physics' and 'Thermal Physics', each commanding a share of about 12% of the total marks. These topics can be covered thoroughly in a relatively less time (10% of total time can be allocated to each topic); therefore, a student should look at exhaustively preparing for these topics.]

The last but not the least, 'Mechanical Waves' (sound) has accounted for approximately 12% of the total marks. Students can prepare for Wave Motion by restricting their total time spent on this particular topic to about 10%.

CHEMISTRY
'Organic Chemistry' has the highest weightage with mean marks of 36%. Topics like 'Isomerism' and 'Name Reactions', and 'Stability of reaction intermediates' should be thoroughly covered. It is easier to remember the reactions and conversions involving aromatic compounds and a considerable percentage of questions from organic chemistry are based on this part. An understanding of directive influence of substituent groups, resonance and mechanism of reactions definitely helps in cracking the problems of organic chemistry.

'Physical Chemistry' is a close second with a mean weightage of 33%. In fact, questions on physical chemistry are all numerical in nature. Problems on topics like 'Electrochemistry', 'Kinetics', and 'Chemical and Ionic Equilibrium' are always asked either directly or along with some other topic. Students are advised to cover all the topics of physical chemistry. This is an area in which students can be sure of hundred percent score, provided they have a clear understanding of the concepts and a good practice of solving problems within recommended time.

'Inorganic Chemistry' and 'General Chemistry' account for 21% and 10% of the total marks. Inorganic Chemistry should be prepared by studying the group properties and periodicity. Lots of emphasis has to be given to Exceptions. Questions are asked from these topics invariably. The properties of some important compounds are also asked in the form of reactions. Remembering the reactions involved in qualitative analysis is of great advantage. Questions asked in General Chemistry mostly include that from 'Stoichiometry' and 'Chemical Bonding'.

MATHEMATICS
'Calculus' accounts for about 30% of the total marks in JEE Screening. Students can score a high percentage of marks by firmly grasping the fundamentals of Calculus. More emphasis should be given in preparing 'Functions', 'Increasing/Decreasing Functions', and 'Maxima/ Minima of Functions'.

In Integral Calculus, students must practice problems on 'Definite Integral' with a proper understanding of the use of their properties for evaluation.

In 'Area of Regions Bounded by Curves', students should take care to draw figures for obtaining the limits of the integrals to be evaluated.

'Algebra' has a weightage of about 23% of the total marks. Students should emphasize practicing only those topics that have been well understood by them. Since problems on Algebra are trickier, students must practice solving as many different types of problems as they can.

'Analytical Geometry' has a weightage of about 20% of the total marks. It is also a conceptual topic. Before solving a problem, students must draw figures of the given curves to understand the problem.

The topics of 'Vectors and 3-D Geometry' and 'Probability' have a weightage of approximately 6% each. These also have to be thoroughly prepared.

'Trigonometry' carries a weightage of about 9%. It has been observed that this weightage was as high as 17% in JEE Screening 2001 and as low as 4% in JEE Screening 2003. Students, anyways, must be thorough with the topics of 'Inverse functions', 'Solutions of Trigonometric Equations', and 'Solution of Triangles'. The formulae and standard results of trigonometry must be learnt by heart in order to do well in the Mathematics paper.

Please note that the JEE is not about scoring 100% in a subject or the examination. Your aim should be to attain an optimal score in each subject, depending on your strengths and weaknesses.