JEE Mains 2021: Most important topics for Maths, Chemistry & Physics
Exam fever is up and high in JEE Mains 2021 aspirants, as with each passing day they are approaching closer to the decisive day of the exam. Not to mention, they are in all spirits to crack the exam and are seeking every way and trick to come out with flying colours and to boost their spirits, Margdarshan is always at their disposal. We sensed that students require working smart and the best way to do that is to focus upon the most important topics for JEE mains 2021.
Emphasizing those topics that are most probable to show up in exam can be really helpful as it mends you more confidence and saves a good amount of time. Practically, it is the most vital step for smarter preparation. So, our dedicated experts, after deep research into previous exams and question patterns, devised a meaningful list of important and most important topics for JEE mains 2021. Here is the complete list for your reference:
Physics
Important topics:
 Thermodynamics Students can always expect 34 questions from thermodynamics and it has always been one of physics most important topics for JEE Mains. So, getting a good proficiency in it is always crediting in the exam. The main topics to become comfortable within thermodynamics for a good score are:
 Carnot's Engine (especially the efficiency)
 Laws of thermodynamics
 Relationship between Cp and Cv
 Isothermal, Adiabatic and isobaric processes.
 Electrodynamics No wonders that electrodynamics is the bulkiest and weighted topic in JEE. You are sure to have 68 questions from this area in your JEE mains 2021. So, the topics from here to practice deeply are:
 Coulomb's law
 Potential due to point charge and system of charges.
 Relation between field and potential
 Electric dipole and flux
 Capacitors
 Gauss's law
 Potential energy due to charged sphere with cavity.
 Optics anyone can swear on the possibility of optics being the most certain presence in JEE exams. Being a wide topic, it can take a good time to prepare. So here are the optical physics important topics for JEE mains from the syllabus:
 Reflection/refraction
 Snell's law
 Laws of refraction
 Total internal reflection
 Combination of lenses
 Mirror equation
 Refraction through prism
 Dispersion of light
 Magnetism It is certain to expect a good weightage to the magnetism part in physics as each year we get to see it covered in the exam. The main topics to appear most commonly are:
 Magnetic force and field
 Lorentz force
 Magnetic force on a currentcarrying conductor
 Biot Savart law
 Ampere circuital law
 Force between two parallel currentcarrying conductors
 Solenoid and toroid
 Magnetic force on axis of currentcarrying loop
 Modern Physics Each year we can see at least 23 questions from modern physics. Since the topic is too big and a bit difficult, so you can opt for the following subtopics for more concise preparation:
 Atomic physics
 Xray
 DeBroglie wavelength
 Binding energy and nuclear stability
 Decay law
 Massenergy equivalence
 Semiconductor and Alternate Current Semiconductors and Alternate currents do not have too much weightage in the exam but can be scoring due to repetitive questions. The most probable concepts used from these topics in the exam are:
 Resistance and reactance
 AC circuit
 Choke coil
 Fluid Mechanics fluid mechanics always gets its special slot in the most important topics for JEE mains and if you want to score good, it won’t be wise to skip on following topics:
 Calorimetry
 Critical velocity
 Stoke's law
 Terminal velocity
 Bernoulli's theorem
 Viscosity
 Poiseville's formula
Chemistry
Important topics:

 Organic Chemistry – Organic Chemistry might be a strength for some and a weakness for others, but it is essential for exam undoubtedly and certainly needs a good space in the list of most important topics for JEE mains. You cannot hope of making it big in JEE exams if you do not master the following key topics from organic chemistry:
 Tautomerism and stereoisomerism
 Aromatic compounds
 Hydrocarbons halogenation of alkanes, reducing and oxidizing agents, electrophilic substitution
 Haloalkanes polyhalo compounds, SN and elimination reactions
 Alcohols esterification, industrial preparation, oxidation, glycerol, glycol,
 Ethers HX reaction, ringopening
 Carbonyls testing methods, polymerization, conjugate reactions, condensations
 Carboxylic acids Grignard reaction, decarboxylation, heating effects
 Amines aromaticity, azo coupling
 Inorganic Chemistry Inorganic chemistry can be tricky but when it comes to JEE exam, it is more specific. You can expect a good number of questions from the following topics:
 Periodic table Ionisation energy, electronegativity, exceptions
 Chemical bonding VSEPR, MOT, hybridization, dipole moment, Hydrogen bonding,
 Coordination compounds Nomenclature, CFT, Electronic configuration, spd blocks
 Metallurgy and qualitative analysis
 Physical Chemistry physical chemistry can be most scoring in the chemical zone of the exam. If you make the chemistry important topics for JEE mains from this section your strength, then it can add much to your overall scoring:
 Atomic structure mole concept, stoichiometry, Avogadro's law, Normality, DulongPettit law, ionic strength, rudimentary, Dalton's theory, Rutherford's scattering experiment, DeBroglie hypothesis, Heisenberg's Uncertainty principle
 Thermodynamics and Kinetic theory first and second law of thermodynamics, jouleThompson expansion, enthalpy, Kirchhoff’s equations, kinetic theory laws, ideal gas equation, Maxwell distribution, real and ideal gases
 Solid State types of solids, Bragg's equation, packing factor
 Surface chemistry adsorption, catalysis, Bredig's arc method, Hardy Schulz law, Ostwald’s theory
 Equilibrium – chemical and ionic equilibrium, stoichiometric representation, Henry’s law, Le Chateller's principle, reversible reaction. Common ion effect, Bronsted Lawry concept, buffer solution
 Electrochemistry Faraday's laws, resistance, conductivity, electroplating, Kohlrausch's law, ionic mobility.
Mathematics
Important topics
Mathematics is most favored subjects by maximum portion of JEE aspirants and to crack through this section, it would be helpful to know maths important topics for JEE mains. Our experts this deliver you to the crisp list of the topics, you are certainly going to witness in the exam.
 CALCULUS
 Application of derivatives
 Definite integrals
 Application of integrals
 Functions
 Continuity and differentiability
 Limits
 Tangents and Normals
 Rate measurement
 Maxima and minima
 Area under curves
 COORDINATE GEOMETRY
 Circle
 Parabola
 Hyperbola
 Straight lines (Most important)
 Conic sections
 Properties of triangles
 ALGEBRA
 Vector and 3D (Most important)
 Quadratic equations
 Sequence and Series
 Permutations and Combinations
 Probability
 Complex Numbers
 Matrix and Determinants
 Binomial theorem
 Trigonometry
 Trigonometric ratios
 Heights and distances
 Inverse trigonometric functions
We do not claim it that all the questions in the exam will appear from these topics only, but we can assure you that a maximum portion will be covered from these topics only. If you make these most important topics for JEE mains your best friend, no way you don’t crack through the exam.
So, focus on smart and fast preparation to extract maximum out of time with this checklist of important topics for JEE mains 2021 from experts
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