JEE MAIN-2021 Analysis
Mathematics
All the papers in February slot contained questions of moderate and slightly above average difficulty. We can say that they are slightly easier compared to previous years. The papers presented no surprises at all. The papers did not pose any problem with respect to time management as some lengthier questions were balanced by standard and repeated models where the students can get the answers without spending too much time. A student who is thorough with the intermediate level concepts and problems would have found the papers easy.
There was more stress on calculus and algebra and some topics like conic sections were neglected in some papers. As far as calculus is concerned there were 2-3 questions from definite integrals & 1-2 from differential equations. In algebra, 2-3 questions appeared from matrices & determinants, 1 question from binomial theory, 1 question from permutations. Relatively, complex numbers were neglected. Questions from permutations & probability were on the easier side. Questions from statistics & mathematical reasoning appeared as usual.
The questions in conic sections were of mixed type involving for example, circles & parabola, ellipse and hyperbola. In 3D geometry easy models on planes and routine, mixed models of 3D lines and planes were asked. One question appeared from vectors which was easy.
In trigonometry there was one question asked from each of trigonometric equations, inverse trigonometric functions and heights and distances.
Overall, the papers were student friendly. Students who are good in formulae, concepts and perfect in calculations will have a definite edge.
JEE MAIN 2021 – Maths Analysis
Ch. V. Chandrasekhar
IIT Maths Faculty
Chemistry
JEE Main Feb 2021 Chemistry Part is little easier than Jan 2020 phase, but NTA has maintained its standards in preparing the question papers.
Physical Chemistry questions has given mostly as numerical and it will take some time for the students problem solving ability in topics like Chemical Kinetics, Colligative properties, Electro Chemistry, Equilibrium and States of Matter are tested to the care. Number Theory questions in physical chemistry are very very less. Topics like Solid State and Surface Chemistry were tested in this discipline.
Inorganic Chemistry was given equal priority along with physical and organic chemistry except24th first and 26th second shift. Usually inorganic questions are memory based but this time logical thinking also tested. Students who prepared from NCERT will be definitely benefited in inorganic chemistry. Topics like Metallurgy, Complex Compounds and Chemical Bonding questions were asked very vividly. Topics like S-block, P-block, questions are mostly memory based.
Organic chemistry has given priority in every paper. 24th first and 26th second shift given more number of questions. General Organic Chemistry, Hydrocarbons, Halides, Alcohols and Carbonyl compounds has given more priority and most of the questions are analytical rather than memory based. Special topics like biomolecules, polymers, chemistry in everyday life and environmental chemistry were given more or less in every question paper. Students who has given time for the above topics they got their rewards.
Analysis and application knowledge prioritized rather than the memory based. These kind of papers will change the students perception towards chemistry subject. Difficulty level of a question paper is always debatable but finally we could say one thing Chemistry papers are standardized.
Physics
Compared to past years’ JEE MAIN papers, February papers were easy. Assertion reason and match the column type of questions were observed in these shifts. In most of the papers there was a deviation from regular weightage. For example, weightage for electricity and magnetism was less and a more for modern physics compared to previous years. Most of the questions were based on models from NCERT books. The difficulty level of the papers was found to be easy to moderate. Most of the questions were of routine in nature. Some numeric type questions were calculation intensive. But, these were balanced by questions based purely on concepts which did not involve any calculations especially in modern physics. Time did not pose a problem. Choice in numeric type questions greatly helped students.
Paper wise analysis
- Feb 24th Morning Shift
The paper was easy to moderate. Nearly 20% of the questions were from modern physics and 10% of questions were from heat & thermodynamics electricity & magnetism (20%) and mechanics (40%). Interestingly, 3 questions were asked from gravitation alone. Around 10 questions were formula based with simple calculations and 5 questions were conceptual, which is an easy task to score with less effort for majority of the students.
- Feb 24th Evening Shift
Paper was slightly tougher than previous shift. Questions asked from mechanics contributed nearly 30% and from electricity and magnetism nearly 20% which is very less. 3 questions each were asked from Atomic Physics, Semi-conductors, EM Waves & Communication system, KTG & Thermodynamics
- Feb 25th Morning Shift
The paper had slightly lengthy calculations compared to previous shifts. From Electricity and magnetism nearly 23% and from mechanics around 37% questions and 20% from modern physics,3 questions appeared from gravitation.
- Feb 25th Evening Shift
Paper was easy to moderate. Nearly 13 to 15 questions could be solved by simple calculations. Modern physics contributed nearly 30% weightage which is more. 3 questions from each of the topics semiconductors, electrostatics were observed& 4 questions from atomic physics appeared.
- Feb 26th Morning Shift
Paper was moderate with mechanics having 43%, modern physics 17%, electricity and magnetism 20% of weightage. In this shift 3 questions were there from gravitation.
- Feb 26th Evening Shift
Nearly 10 questions were easy to answer. From mechanics 37%, electricity and magnetism 20% modern physics 20% and optics 10% of questions appeared. Notably, five questions appeared from SHM alone and 3questions each from electrostatics, optics & thermodynamics were appeared.In summary, a student who is thorough with NCERT level concepts and practiced systematically on easy to moderate questions would have fared very well.
