JEE Main · 2,809 ideas · 2017–2026

What JEE Main asks again

Inside each topic we tagged the exact idea every question tested. Here is which ideas came back, in which chapters, in what form and after how long.

Ideas tested: 2,809; in 108 shifts
Asked only once: 49%; 1,377 ideas
Asked twice or more: 1432; across 79 chapters
In three or more years: 718; 387 of them in four or more

Key findings

01
Of the 2,809 ideas Lumi tagged in 108 JEE Main shifts, 1,377 (49%) were asked only once.
02
1307 ideas came back in a later year, and 718 in three or more of the 8 years. The most asked, High and Low Spin States, came 34 times in 30 shifts.
03
In 2026, 82% of questions tested an idea an earlier year had asked, up from 5% in 2020.
04
45% of returns came in the same year, 97% of those in another shift. Across years, the most common gap is 1 year.
05
Aldehydes, Ketones and Carboxylic Acids holds the most repeating ideas (35 of 59). By subject: Physics 49%, Chemistry 55%, Maths 49% of ideas asked again.

47%

of ideas were asked in more than one year

One year1,50253%
Two years58921%
Three years33112%
Four or more38714%

2,809 ideas by how many of the 8 analysed years asked them.

79%

of returns came the same year or the next

GapReturnsSo far

Same219645%
1 yr170879%
2 yrs55491%
3 yrs25096%
4 yrs14199%
5 yrs43100%
6 yrs15100%
7 yrs3100%
8 yrs1100%

Years between two asks of the same idea, 4,911 returns. Same: another shift that year, or 63 times twice in one shift. 2018 and 2019 have no analysed shifts, so a return from 2017 to 2020 counts as 3 years.

82%

of 2026 questions went back to an idea from an earlier year

82%

’20’21’22’23’24’25’26

Share of each year’s analysed questions testing an idea an earlier year had asked. It rises partly because each year has more years behind it, and since 2024 more shifts a year are analysed.

The most repeated

Ideas asked in 4 years or more

387 ideas came back in 4 or more of the 8 years, 188 of them in 5 or more. They are the closest thing JEE Main has to a fixed question. Open any row for the newest questions that tested it; the idea’s page has all of them.

Sort

Idea	Subject	Years	Span	’17’20’21’22’23’24’25’26
Combinations of Distinct ObjectsPermutations and Combinations	Maths	816 questions	2017–26	2343
Area of InequalitiesApplication of Integrals › Area Under Curves	Maths	815 questions	2017–26	33222
High and Low Spin StatesCoordination Compounds › Crystal Field Theory	Chemistry	734 questions	2020–26	5424784
Where it sits Coordination Compounds › Crystal Field Theory Usually asked as Single correct · Application How it was asked order of unpaired electrons in complexes identify low spin diamagnetic octahedral complex The newest 4 of 34 questions 8 Apr ’26 S2 · Q71 Number of paramagnetic complexes among the following is ________. $[\mathrm{MnBr_4}]^{2-}$ , $[\mathrm{NiCl_4}]^{2-}$ ,… mediumNumerical valueAsked the year before 6 Apr ’26 S2 · Q61 Read the question mediumOtherAsked the year before 5 Apr ’26 S2 · Q71 Read the question easyNumerical valueAsked the year before 4 Apr ’26 S2 · Q60 Read the question mediumSingle correctAsked the year before All 34 on the idea’s page
AP Sum of n termsSequences and Series › AP and GP	Maths	731 questions	2020–26	5543824
Combinational Logic CircuitsSemiconductor Electronics: Materials, Devices and Simple Circuits › Logic Gates	Physics	731 questions	2020–26	2102844
Greatest Integer Function IntegralsIntegrals › Definite Integral Properties	Maths	729 questions	2020–26	1183222
Spin-only Magnetic MomentCoordination Compounds › Crystal Field Theory	Chemistry	728 questions	2020–26	24875
Condition for Infinite SolutionsDeterminants › Cramer's Rule	Maths	725 questions	2020–26	253383
Area Between CurvesApplication of Integrals › Area Under Curves	Maths	722 questions	2020–26	234255
Finding Unknown Observations from Mean and VarianceStatistics › Variance and SD	Maths	722 questions	2020–26	254343
Integrating Factor CalculationDifferential Equations › Linear Differential Equations	Maths	722 questions	2020–26	23456
Elastic ModuliMechanical Properties of Solids › Elasticity	Physics	718 questions	2020–26	4434
Adiabatic Process AnalysisThermodynamics › Thermodynamic Processes	Physics	716 questions	2020–26	33233
Newton's SumsComplex Numbers and Quadratic Equations › Quadratic Roots	Maths	716 questions	2020–26	42332
Reductive Ozonolysis ProductsHydrocarbons › Alkenes and Alkynes	Chemistry	716 questions	2020–26	34232
Initial Value ProblemDifferential Equations › Variable Separable Form	Maths	715 questions	2017–26	4224
Magnitude and Sine FormulaVector Algebra › Cross Product	Maths	713 questions	2017–26	2323
Standard Cell PotentialElectrochemistry › Nernst Equation	Chemistry	713 questions	2017–26	423
Ideal vs. Practical Diode Circuit AnalysisSemiconductor Electronics: Materials, Devices and Simple Circuits › Semiconductor Diodes	Physics	712 questions	2020–26	332
Relative Lowering of VPSolutions › Colligative Properties	Chemistry	712 questions	2020–26	332
Kinetic Energy and TempKinetic Theory › Kinetic Theory of Gases	Physics	711 questions	2020–26	223
Choosing Series Expansion over L'HopitalLimits and Derivatives › L'Hopital's Rule	Maths	710 questions	2020–26	222
Precipitation Tests for Ionization IsomersCoordination Compounds › Coordination Isomerism	Chemistry	78 questions	2017–26	2
Spin-only MagnetismThe d- and f-Block Elements › d-Block Elements	Chemistry	623 questions	2020–26	46822
Powers of Square MatricesMatrices › Matrix Multiplication	Maths	621 questions	2020–25	27542
Solving Vector Equations with Cross ProductsVector Algebra › Cross Product	Maths	620 questions	2020–26	43273
Ground-to-Ground ParametersMotion in a Plane › Projectile Motion	Physics	619 questions	2021–26	6542
Method of Differences for Telescoping SeriesSequences and Series › AP and GP	Maths	619 questions	2021–26	35442
King's PropertyIntegrals › Definite Integral Properties	Maths	618 questions	2020–25	24272
Condition for No SolutionDeterminants › Cramer's Rule	Maths	617 questions	2017–26	455
Continuity involving GIF and Fractional PartContinuity and Differentiability	Maths	617 questions	2020–26	22633
Series and Parallel CombinationsElectrostatic Potential and Capacitance › Parallel Plate Capacitors	Physics	617 questions	2020–26	23542
Image of a Point in a LineThree Dimensional Geometry › Lines in 3D	Maths	616 questions	2020–26	274
Inverse Relation to Double AdjointDeterminants › Matrix Inverse	Maths	616 questions	2020–26	224422
Cartesian Shortest DistanceThree Dimensional Geometry › Skew Lines	Maths	615 questions	2020–26	426
Faraday's Law MagnitudeElectromagnetic Induction › Faraday's Law	Physics	615 questions	2020–26	234222
Infinite GP SumSequences and Series › AP and GP	Maths	615 questions	2020–26	3442
Root-Coefficient RelationComplex Numbers and Quadratic Equations › Quadratic Roots	Maths	615 questions	2020–26	4225
Wavelength Ratios of Different ParticlesDual Nature of Radiation and Matter › Matter Waves	Physics	615 questions	2020–26	732
Evaluating Parameters for ConsistencyDeterminants › Cramer's Rule	Maths	615 questions	2020–25	24323

Where it sits
Coordination Compounds › Crystal Field Theory
Usually asked as
Single correct · Application
How it was asked
order of unpaired electrons in complexes
identify low spin diamagnetic octahedral complex
The newest 4 of 34 questions
- 8 Apr ’26 S2 · Q71
  Number of paramagnetic complexes among the following is ________. $[\mathrm{MnBr_4}]^{2-}$ , $[\mathrm{NiCl_4}]^{2-}$ ,…
  mediumNumerical valueAsked the year before
- 6 Apr ’26 S2 · Q61
  Read the question
  mediumOtherAsked the year before
- 5 Apr ’26 S2 · Q71
  Read the question
  easyNumerical valueAsked the year before
- 4 Apr ’26 S2 · Q60
  Read the question
  mediumSingle correctAsked the year before
All 34 on the idea’s page

Years counts the different years that asked the idea. Squares are the 8 years with analysed shifts, 2017 to 2026; a number means the idea came more than once that year, usually in different shifts. The shade is scaled to one shift, since Lumi analysed 1 to 24 shifts a year.

Where repeats live

Chapters that keep asking the same ideas

79 chapters have at least one idea asked twice or more. Size alone does not explain it: among chapters with 40 or more ideas tested, the share asked again runs from 39% (Conic Sections) to 64% (Differential Equations).

Every chapter, by size and by repeat rate

Bubble size: ideas asked again. Dashed lines: the median chapter. Chapters with fewer than 5 ideas left out.

Physics
Chemistry
Maths

Swipe the chart sideways to see all of it.

Most repeating ideas

Top ten chapters. The bar splits each chapter’s ideas into asked again and asked once.

01Aldehydes, Ketones and Carboxylic Acids35 of 59
02Integrals35 of 66
03Conic Sections33 of 84
04System of Particles and Rotational Motion32 of 60
05Three Dimensional Geometry32 of 65
06Current Electricity31 of 57
07Application of Derivatives30 of 66
08Differential Equations29 of 45
09The p-Block Elements28 of 53
10Complex Numbers and Quadratic Equations27 of 54

37%

of all repeating ideas are Chemistry, from 34% of the ideas

Physics45% came back · 1015 ideas
559207113136
Most asked: Combinational Logic Circuits, 31 times in 7 years.
Chemistry49% came back · 966 ideas
488224124130
Most asked: High and Low Spin States, 34 times in 7 years.
Maths45% came back · 828 ideas
45515894121
Most asked: Combinations of Distinct Objects, 16 times in 8 years.

One year
2 years
3 years
4+

Each subject’s ideas by how many of the 8 analysed years asked them.

61%

of calculation ideas were asked again, the most of any skill

Calculation883 ideas61%
Application390 ideas59%
Recall225 ideas48%
Diagram reading25 ideas48%
Multi-step864 ideas42%
Conceptual354 ideas42%
Data or graph68 ideas41%

All ideas: 51% asked again. Dot size: number of ideas.

Share of ideas asked twice or more, by the skill the question tested.

Form

The shape repeated ideas take

Match the list ideas come back most often: 36 of 57 (63%) were asked again. A line that climbs means the format is over-represented among the ideas JEE Main reuses.

Share of all ideas against share of repeating ideas

Navy: formats JEE Main reuses more than it asks. Light: formats it brings back less. Square-root scale.

Chance a format’s idea is asked again

Formats with at least 10 ideas.

Match the list57 ideas63%
Diagram based271 ideas57%
Numerical value896 ideas56%
Assertion–reason52 ideas56%
Single correct1422 ideas48%
Other60 ideas43%
Two statements51 ideas4%

All ideas: 51% asked again. Dot size: number of ideas.

Repetition explorer

Every idea asked twice or more

Filter by subject or by how often, search by name, and sort by times asked, recency or chapter.

1432 ideas · 6343 questions

High and Low Spin States34×
Crystal Field Theory · Chemistry
“order of unpaired electrons in complexes”
last 2026 · every 1.0 yrs · Single correct · Asked most years
AP Sum of n terms31×
AP and GP · Maths
“sum of series with summation general term”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Combinational Logic Circuits31×
Logic Gates · Physics
“identify output of combinational logic circuit”
last 2026 · every 1.0 yrs · Diagram based · Asked most years
Greatest Integer Function Integrals29×
Definite Integral Properties · Maths
“definite integral with greatest integer function”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Spin-only Magnetic Moment28×
Crystal Field Theory · Chemistry
“spin-only magnetic moment of complex”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Condition for Infinite Solutions25×
Cramer's Rule · Maths
“parameters for infinitely many solutions”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Spin-only Magnetism23×
d-Block Elements · Chemistry
“count paramagnetic ions”
last 2026 · every 1.2 yrs · Numerical value · Asked most years
Area Between Curves22×
Area Under Curves · Maths
“area enclosed between two curves”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Finding Unknown Observations from Mean and Variance22×
Variance and SD · Maths
“find unknown data from mean and variance”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Integrating Factor Calculation22×
Linear Differential Equations · Maths
“solve initial value differential equation”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Powers of Square Matrices21×
Matrix Multiplication · Maths
“sum of elements of high matrix power from recurrence”
last 2025 · every 1.0 yrs · Single correct · Asked most years
Solving Vector Equations with Cross Products20×
Cross Product · Maths
“unknown vector from cross and dot conditions”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Ground-to-Ground Parameters19×
Projectile Motion · Physics
“ratio of ranges at two angles”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Method of Differences for Telescoping Series19×
AP and GP · Maths
“sum of telescoping series”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Elastic Moduli18×
Elasticity · Physics
“percentage volume change from bulk modulus”
last 2026 · every 1.0 yrs · Single correct · Asked most years
King's Property18×
Definite Integral Properties · Maths
“definite integral using king's property”
last 2025 · every 1.0 yrs · Single correct · Asked most years
Condition for No Solution17×
Cramer's Rule · Maths
“parameters for no solution of linear system”
last 2026 · every 1.8 yrs · Single correct · Asked most years
Continuity involving GIF and Fractional Part17×
Continuity and Differentiability · Maths
“count discontinuities of greatest integer function”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Series and Parallel Combinations17×
Parallel Plate Capacitors · Physics
“equivalent capacitance of capacitor network”
last 2026 · every 1.2 yrs · Numerical value · Asked most years
Adiabatic Process Analysis16×
Thermodynamic Processes · Physics
“work done in adiabatic expansion”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Combinations of Distinct Objects16×
Permutations and Combinations · Maths
“ways to win a series”
last 2026 · every 1.3 yrs · Numerical value · Asked most years
Image of a Point in a Line16×
Lines in 3D · Maths
“image of point in a line”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Inverse Relation to Double Adjoint16×
Matrix Inverse · Maths
“evaluate nested adjoint and inverse of matrix”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Newton's Sums16×
Quadratic Roots · Maths
“value from roots of linked quadratics”
last 2026 · every 1.0 yrs · Single correct · Asked most years
Reductive Ozonolysis Products16×
Alkenes and Alkynes · Chemistry
“deduce alkene from ozonolysis products”
last 2026 · every 1.0 yrs · Diagram based · Asked most years
Freezing Point Depression16×
Colligative Properties · Chemistry
“freezing point of solution”
last 2024 · every 1.3 yrs · Numerical value · Comes in cycles
Molarity Calculation16×
Mole Concept · Chemistry
“molarity from mass percent and density”
last 2024 · every 1.0 yrs · Numerical value · Asked most years
Area of Inequalities15×
Area Under Curves · Maths
“area of region defined by inequalities”
last 2026 · every 1.3 yrs · Single correct · Asked most years
Cartesian Shortest Distance15×
Skew Lines · Maths
“shortest distance between skew lines”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Faraday's Law Magnitude15×
Faraday's Law · Physics
“peak emf in loop in sinusoidal field”
last 2026 · every 1.2 yrs · Numerical value · Asked most years
Infinite GP Sum15×
AP and GP · Maths
“combined ap and gp conditions”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Initial Value Problem15×
Variable Separable Form · Maths
“solve initial value differential equation”
last 2026 · every 1.5 yrs · Single correct · Asked most years
Root-Coefficient Relation15×
Quadratic Roots · Maths
“value from roots of linked quadratics”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Wavelength Ratios of Different Particles15×
Matter Waves · Physics
“ratio of de broglie wavelengths”
last 2026 · every 1.2 yrs · Single correct · Asked most years
Evaluating Parameters for Consistency15×
Cramer's Rule · Maths
“parameters for infinitely many solutions”
last 2025 · every 1.0 yrs · Single correct · Asked most years
GP General Term15×
AP and GP · Maths
“combined ap and gp conditions”
last 2025 · every 1.0 yrs · Single correct · Asked most years
Joule Heating and Power15×
Ohm's Law and Resistance · Physics
“power loss from efficiency”
last 2025 · every 1.0 yrs · Numerical value · Asked most years
Zener Diode Regulation15×
Semiconductor Diodes · Physics
“ammeter reading in zener circuit”
last 2025 · every 1.3 yrs · Numerical value · Asked most years
Carnot Efficiency Limit15×
Heat Engines and Refrigerators · Physics
“sink temperature from efficiency”
last 2023 · every 1.0 yrs · Single correct · Comes in cycles
Family of Planes15×
Planes in 3D · Maths
“plane through intersection of two planes”
last 2023 · every 1.0 yrs · Single correct · Comes in cycles

Idea	Chapter · topic	Times	Last · interval	Format · skill	Pattern
High and Low Spin States“order of unpaired electrons in complexes”	Coordination Compounds Crystal Field Theory	34	2026every 1.0 yrs	Single correctApplication	Asked most years
AP Sum of n terms“sum of series with summation general term”	Sequences and Series AP and GP	31	2026every 1.0 yrs	Single correctMulti-step	Asked most years
Combinational Logic Circuits“identify output of combinational logic circuit”	Semiconductor Electronics: Materials, Devices and Simple Circuits Logic Gates	31	2026every 1.0 yrs	Diagram basedDiagram reading	Asked most years
Greatest Integer Function Integrals“definite integral with greatest integer function”	Integrals Definite Integral Properties	29	2026every 1.0 yrs	Single correctCalculation	Asked most years
Spin-only Magnetic Moment“spin-only magnetic moment of complex”	Coordination Compounds Crystal Field Theory	28	2026every 1.0 yrs	Single correctCalculation	Asked most years
Condition for Infinite Solutions“parameters for infinitely many solutions”	Determinants Cramer's Rule	25	2026every 1.0 yrs	Single correctCalculation	Asked most years
Spin-only Magnetism“count paramagnetic ions”	The d- and f-Block Elements d-Block Elements	23	2026every 1.2 yrs	Numerical valueMulti-step	Asked most years
Area Between Curves“area enclosed between two curves”	Application of Integrals Area Under Curves	22	2026every 1.0 yrs	Single correctMulti-step	Asked most years
Finding Unknown Observations from Mean and Variance“find unknown data from mean and variance”	Statistics Variance and SD	22	2026every 1.0 yrs	Single correctMulti-step	Asked most years
Integrating Factor Calculation“solve initial value differential equation”	Differential Equations Linear Differential Equations	22	2026every 1.0 yrs	Single correctMulti-step	Asked most years
Powers of Square Matrices“sum of elements of high matrix power from recurrence”	Matrices Matrix Multiplication	21	2025every 1.0 yrs	Single correctMulti-step	Asked most years
Solving Vector Equations with Cross Products“unknown vector from cross and dot conditions”	Vector Algebra Cross Product	20	2026every 1.2 yrs	Single correctMulti-step	Asked most years
Ground-to-Ground Parameters“ratio of ranges at two angles”	Motion in a Plane Projectile Motion	19	2026every 1.0 yrs	Single correctCalculation	Asked most years
Method of Differences for Telescoping Series“sum of telescoping series”	Sequences and Series AP and GP	19	2026every 1.0 yrs	Single correctCalculation	Asked most years
Elastic Moduli“percentage volume change from bulk modulus”	Mechanical Properties of Solids Elasticity	18	2026every 1.0 yrs	Single correctCalculation	Asked most years
King's Property“definite integral using king's property”	Integrals Definite Integral Properties	18	2025every 1.0 yrs	Single correctMulti-step	Asked most years
Condition for No Solution“parameters for no solution of linear system”	Determinants Cramer's Rule	17	2026every 1.8 yrs	Single correctApplication	Asked most years
Continuity involving GIF and Fractional Part“count discontinuities of greatest integer function”	Continuity and Differentiability Continuity and Differentiability	17	2026every 1.2 yrs	Single correctMulti-step	Asked most years
Series and Parallel Combinations“equivalent capacitance of capacitor network”	Electrostatic Potential and Capacitance Parallel Plate Capacitors	17	2026every 1.2 yrs	Numerical valueCalculation	Asked most years
Adiabatic Process Analysis“work done in adiabatic expansion”	Thermodynamics Thermodynamic Processes	16	2026every 1.0 yrs	Single correctCalculation	Asked most years
Combinations of Distinct Objects“ways to win a series”	Permutations and Combinations Permutations and Combinations	16	2026every 1.3 yrs	Numerical valueCalculation	Asked most years
Image of a Point in a Line“image of point in a line”	Three Dimensional Geometry Lines in 3D	16	2026every 1.2 yrs	Single correctCalculation	Asked most years
Inverse Relation to Double Adjoint“evaluate nested adjoint and inverse of matrix”	Determinants Matrix Inverse	16	2026every 1.2 yrs	Single correctMulti-step	Asked most years
Newton's Sums“value from roots of linked quadratics”	Complex Numbers and Quadratic Equations Quadratic Roots	16	2026every 1.0 yrs	Single correctMulti-step	Asked most years
Reductive Ozonolysis Products“deduce alkene from ozonolysis products”	Hydrocarbons Alkenes and Alkynes	16	2026every 1.0 yrs	Diagram basedMulti-step	Asked most years
Freezing Point Depression“freezing point of solution”	Solutions Colligative Properties	16	2024every 1.3 yrs	Numerical valueCalculation	Comes in cycles
Molarity Calculation“molarity from mass percent and density”	Some Basic Concepts of Chemistry Mole Concept	16	2024every 1.0 yrs	Numerical valueCalculation	Asked most years
Area of Inequalities“area of region defined by inequalities”	Application of Integrals Area Under Curves	15	2026every 1.3 yrs	Single correctMulti-step	Asked most years
Cartesian Shortest Distance“shortest distance between skew lines”	Three Dimensional Geometry Skew Lines	15	2026every 1.2 yrs	Single correctCalculation	Asked most years
Faraday's Law Magnitude“peak emf in loop in sinusoidal field”	Electromagnetic Induction Faraday's Law	15	2026every 1.2 yrs	Numerical valueCalculation	Asked most years
Infinite GP Sum“combined ap and gp conditions”	Sequences and Series AP and GP	15	2026every 1.2 yrs	Single correctMulti-step	Asked most years
Initial Value Problem“solve initial value differential equation”	Differential Equations Variable Separable Form	15	2026every 1.5 yrs	Single correctMulti-step	Asked most years
Root-Coefficient Relation“value from roots of linked quadratics”	Complex Numbers and Quadratic Equations Quadratic Roots	15	2026every 1.2 yrs	Single correctMulti-step	Asked most years
Wavelength Ratios of Different Particles“ratio of de broglie wavelengths”	Dual Nature of Radiation and Matter Matter Waves	15	2026every 1.2 yrs	Single correctCalculation	Asked most years
Evaluating Parameters for Consistency“parameters for infinitely many solutions”	Determinants Cramer's Rule	15	2025every 1.0 yrs	Single correctMulti-step	Asked most years
GP General Term“combined ap and gp conditions”	Sequences and Series AP and GP	15	2025every 1.0 yrs	Single correctMulti-step	Asked most years
Joule Heating and Power“power loss from efficiency”	Current Electricity Ohm's Law and Resistance	15	2025every 1.0 yrs	Numerical valueCalculation	Asked most years
Zener Diode Regulation“ammeter reading in zener circuit”	Semiconductor Electronics: Materials, Devices and Simple Circuits Semiconductor Diodes	15	2025every 1.3 yrs	Numerical valueCalculation	Asked most years
Carnot Efficiency Limit“sink temperature from efficiency”	Thermodynamics Heat Engines and Refrigerators	15	2023every 1.0 yrs	Single correctCalculation	Comes in cycles
Family of Planes“plane through intersection of two planes”	Three Dimensional Geometry Planes in 3D	15	2023every 1.0 yrs	Single correctMulti-step	Comes in cycles

Interval is the average number of calendar years between the years that asked the idea. Pattern is how the idea has behaved across the analysed shifts: asked most years, in cycles, new since 2024 or gone quiet. How we tag and count.

Index

All 2,809 ideas, by chapter

Every idea JEE Main tested in the 108 analysed shifts from 2017–2026, including those asked once. Open a chapter, then an idea for its questions and how they were framed.

Physics · 1,015 ideas

Alternating Current38

Atoms27

Current Electricity57

Dual Nature of Radiation and Matter35

Electric Charges and Fields50

Electromagnetic Induction31

Electromagnetic Waves3

Electrostatic Potential and Capacitance52

Gravitation32

Kinetic Theory23

Laws of Motion54

Magnetism and Matter14

Mechanical Properties of Fluids46

Mechanical Properties of Solids17

Motion in a Plane32

Motion in a Straight Line31

Moving Charges and Magnetism49

Nuclei30

Oscillations42

Ray Optics and Optical Instruments63

Semiconductor Electronics: Materials, Devices and Simple Circuits37

System of Particles and Rotational Motion60

Thermal Properties of Matter31

Thermodynamics43

Units and Measurements7

Wave Optics36

Waves36

Work, Energy and Power39

Chemistry · 966 ideas

Alcohols, Phenols and Ethers37

Aldehydes, Ketones and Carboxylic Acids59

Amines49

Biomolecules26

Chemical Bonding and Molecular Structure40

Chemical Kinetics39

Chemistry in Everyday Life19

Classification of Elements and Periodicity in Properties22

Coordination Compounds48

Electrochemistry30

Environmental Chemistry18

Equilibrium44

General Principles and Processes of Isolation of Elements25

Haloalkanes and Haloarenes48

Hydrocarbons29

Hydrogen27

Kinetic Theory1

Connected Gas Bulbs Equilibrium4×

Organic Chemistry: Some Basic Principles and Techniques53

Polymers22

Practical Chemistry (Qualitative Analysis)6

Redox Reactions13

Solutions26

Some Basic Concepts of Chemistry28

States of Matter14

Ideal Gas Equation10×
Dalton's Law7×
Gas Density and Molar Mass3×
Gay-Lussac's Law3×
Individual Gas Laws3×
Compressibility Factor Z2×
Gas Liquefaction2022
Gas Molecular Velocity Ratios2023
Graphical Analysis of Boyle's Law2021
Graphical Analysis of Gas Laws2020
High Pressure VdW Limit2021
Predicting 'a' from Molecular Structure2023
Translational Kinetic Energy2021
Vapor Pressure-Temperature Graph Interpretation2020

Structure of Atom34

Surface Chemistry25

The d- and f-Block Elements46

The p-Block Elements53

The s-Block Elements28

The Solid State16

Thermodynamics (Chemistry)40

Units and Measurements1

Units of VdW Constants2×

Maths · 828 ideas

Application of Derivatives66

Application of Integrals23

Binomial Theorem29

Complex Numbers and Quadratic Equations54

Conic Sections84

Continuity and Differentiability39

Determinants28

Differential Equations45

Integrals66

Inverse Trigonometric Functions29

Limits and Derivatives17

Matrices28

Permutations and Combinations29

Probability27

Relations and Functions36

Sequences and Series31

Statistics20

Straight Lines27

Three Dimensional Geometry65

Trigonometric Functions43

Vector Algebra42

Method

How to read this

What is an idea?

The single fact, law or method a question tests, one level below the topic. For example, the topic Crystal Field Theory holds the idea High and Low Spin States.

Does a repeated idea mean a repeated question?

No. A repeat here means the same idea, not the same question: it can come back as a numerical-answer question in one shift and a single-correct one in the next. Learn the idea, not the old question.

Why do so many repeats fall in the same year?

JEE Main runs many shifts a year, each with its own paper, and Lumi analysed up to 24 shifts in a single year, so an idea asked in one shift can come back in another shift of that same year: 45% of returns are same-year.

Does this cover every shift?

No. It covers 108 of the 174 JEE Main shifts held from 2017 to 2026 (9,285 Paper 1 questions), not every shift. An idea counted once here may have come in a shift Lumi has not analysed, so the repeat counts are a floor.

See repeat patterns by topic