JEE Main Physics Important Chapters: 475 Questions, Counted

Before JEE Main, every student asks the same question. Which chapters are important in Physics?

Search it once and you will get a list. Ray Optics. Current Electricity. Modern Physics. Every website has a list ready. But almost no website tells you where that list came from.

So we did the counting ourselves.

How we counted

We have already published 19 JEE Main 2026 Physics papers on this site. Five dates in January and five in April. Each paper has 25 Physics questions and 100 marks.

On each of those pages, every single question is already marked with its chapter. We only added those up.

That gives 475 questions and 1,900 marks of real paper. All 19 papers are linked at the end, so you can check any number yourself.

One thing you should know before you see the table. NTA never publishes chapter weightage. Not for any year. So every weightage list you see anywhere, ours also, is somebody counting old papers. Ours is one year of papers. Use it as information, not as a rule.

JEE Main Physics 2026 — all chapters, counted

#	Chapter	Questions	Marks	Per shift	Share
1	Ray Optics	35	140	1.8	7.4%
2	Units and Measurements	33	132	1.7	6.9%
3	Current Electricity	29	116	1.5	6.1%
4	Rotational Motion	26	104	1.4	5.5%
5	Electrostatic Potential and Capacitance	25	100	1.3	5.3%
6	Wave Optics	23	92	1.2	4.8%
7	Thermodynamics	21	84	1.1	4.4%
8	Laws of Motion	20	80	1.1	4.2%
9	Semiconductor Electronics	20	80	1.1	4.2%
10	Mechanical Properties of Fluids	19	76	1.0	4.0%
11	Electromagnetic Induction	19	76	1.0	4.0%
12	Moving Charges and Magnetism	18	72	0.9	3.8%
13	Electromagnetic Waves	17	68	0.9	3.6%
14	Dual Nature of Radiation and Matter	16	64	0.8	3.4%
15	Oscillations	15	60	0.8	3.2%

The other 14 chapters and their question counts: Mechanical Properties of Solids (14), Electric Charges and Fields (13), Nuclei (13), Kinetic Theory of Gases (12), Work, Energy and Power (12), Atoms (11), Waves (10), Alternating Current (10), Gravitation (10), Motion in a Straight Line (9), Thermal Properties of Matter (8), Motion in a Plane (8), Centre of Mass (5), Magnetism and Matter (4).

First thing we learnt: you cannot skip much

Look at how the marks add up.

• Top 4 chapters give about 25% of the questions.
• You need 10 chapters to reach half the paper.
• You need 17 chapters to reach three fourth.
• You need 23 chapters to reach 90%.

Now take the nine smallest chapters. These are exactly the ones every important-chapters list tells you to leave. In these 19 papers they still gave 75 questions. That is 300 marks, and about one question out of every six. If you drop them, you are simply handing over those marks.

Second thing: even the biggest chapter is small

Ray Optics is at number one. It gave 35 questions out of 475. That is 7.4%, which comes to 1.8 questions in one shift. Units and Measurements is second with 33 questions, about 1.7 per shift. By the tenth chapter you are down to nearly one question per shift.

So when a list tells you Ray Optics is the most important chapter, it only means this. Expect about two questions out of 25. That is 8 marks. Good to have. But you cannot build your whole preparation on it.

Third thing: the top of the list is surprising

Units and Measurements is sitting at number two with 33 questions. Most students finish this chapter in the first week of class 11 and never open it again. In these 19 papers it gave as many questions as Current Electricity, and more than Rotational Motion.

Electromagnetic Waves gave 17 questions and Semiconductor Electronics gave 20. Both are small chapters. Both are the first ones students call skippable. Together they gave 37 questions, which is more than Ray Optics gave alone.

The same 475 questions, unit wise

Nobody revises chapter by chapter in the last stage. Everybody revises unit wise. So here is the same count, unit wise.

• Mechanics and properties of matter (10 chapters) — 156 questions, 32.8%
• Magnetism, AC and electromagnetic waves (5 chapters) — 68 questions, 14.3%
• Electrostatics and current electricity (3 chapters) — 67 questions, 14.1%
• Modern physics and electronics (4 chapters) — 60 questions, 12.6%
• Optics (2 chapters) — 58 questions, 12.2%
• Heat and thermodynamics (3 chapters) — 41 questions, 8.6%
• Oscillations and waves (2 chapters) — 25 questions, 5.3%

Two points come out of this. Mechanics is almost one third of the paper, but it is spread over ten chapters. That is why no single mechanics chapter looks big in the table above. And Optics gives the most out of the least — only two chapters, 58 questions, about 3 questions in every shift.

So if you want a short answer to where to start, start with Optics. Then give mechanics the long time it needs.

About two months are left. What should you do?

Do not pick five chapters and drop the rest. The numbers above show what that costs you.

Do this instead. Find out which chapters you are losing marks in. That is a different question from which chapters carry marks.

A chapter that gives 1.8 questions a shift is of no use to you if you are already solving it correctly in one minute. The same chapter matters a lot if you take four minutes and still get it wrong.

Where our numbers can be wrong

Three things, said openly.

• Only one year. This is 2026 data. Another year will change the order a little.
• Our own marking. A few questions sit between two chapters. Another teacher may mark some of them differently.
• Four chapters were written with more than one name on our shift pages — Units and Measurements, Electrostatic Potential and Capacitance, Dual Nature of Radiation and Matter, and Motion in a Straight Line, where one question carried a mixed kinematics label. We added those together, and the shift pages have now been corrected so every chapter carries one name.

Check it yourself

Every number above comes from these 19 pages. Each page lists all 25 questions, what each one asked, and its chapter.

21 January S1 · 21 January S2 · 22 January S1 · 22 January S2 · 23 January S1 · 23 January S2 · 24 January S1 · 24 January S2 · 28 January S1 · 28 January S2 · 2 April S1 · 2 April S2 · 4 April S1 · 4 April S2 · 5 April S1 · 5 April S2 · 6 April S1 · 6 April S2 · 8 April S2

Counted from the 19 JEE Main 2026 Physics shifts published on acceleratephysics.in. 475 questions, 1,900 marks. Last checked 12 November 2026.