JEE Mains 2021 Most important topics

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:


Important topics:

  1. Thermodynamics- Students can always expect 3-4 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.
  1. Electrodynamics- No wonders that electrodynamics is the bulkiest and weighted topic in JEE. You are sure to have 6-8 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.
  1. 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
  1. 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 current-carrying conductor
  • Biot Savart law
  • Ampere circuital law
  • Force between two parallel current-carrying conductors
  • Solenoid and toroid
  • Magnetic force on axis of current-carrying loop
  1. Modern Physics- Each year we can see at least 2-3 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
  • X-ray
  • De-Broglie wavelength
  • Binding energy and nuclear stability
  • Decay law
  • Mass-energy equivalence
  1. 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
  1. 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



Important topics:

    1. 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, ring-opening
  • Carbonyls- testing methods, polymerization, conjugate reactions, condensations
  • Carboxylic acids- Grignard reaction, decarboxylation, heating effects
  • Amines- aromaticity, azo coupling
    1. 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, s-p-d blocks
  • Metallurgy and qualitative analysis-
    1. 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, Dulong-Pettit law, ionic strength, rudimentary, Dalton's theory, Rutherford's scattering experiment, De-Broglie hypothesis, Heisenberg's Uncertainty principle
  • Thermodynamics and Kinetic theory- first and second law of thermodynamics, joule-Thompson 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.


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.

  • Application of derivatives
  • Definite integrals
  • Application of integrals
  • Functions
  • Continuity and differentiability
  • Limits
  • Tangents and Normals
  • Rate measurement
  • Maxima and minima
  • Area under curves
  • Circle
  • Parabola
  • Hyperbola
  • Straight lines (Most important)
  • Conic sections
  • Properties of triangles
  • Vector and 3D (Most important)
  • Quadratic equations
  • Sequence and Series
  • Permutations and Combinations
  • Probability
  • Complex Numbers-
  • Matrix and Determinants
  • Binomial theorem
  1. 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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