A physics plan for JEE Main

Physics carries 25 questions and 100 marks in JEE Main, the same as chemistry and maths. It is often where good candidates pull away from average ones. The syllabus is not larger; the difference is that physics questions combine ideas. A single problem can need Newton's laws, energy conservation and a bit of calculus at once, and you cannot memorise your way through that.

The good news is that physics is also the most predictable subject to improve. Understanding plus a steady volume of problems produces results, usually within a few months. This guide sets out how.

How the chapters connect

Physics is built in layers. A weak lower layer makes every chapter above it harder.

Order to study. Units and kinematics first, then laws of motion, friction and circular motion, then work–energy and momentum. Electrostatics before current, current before magnetism, magnetism before EMI and AC. Modern physics and semiconductors can come at any point, and they are short, formula-driven and often scoring.

Start with our guides to units and errors and kinematics if mechanics feels shaky.

Which chapters tend to carry weight

The exact number of questions per chapter changes from shift to shift, so no chart can tell you what your paper will contain. The broad pattern is steady:

• Mechanics as a block is the largest share of the paper, and it underpins everything else.
• Electricity and magnetism is the second large block.
• Modern physics and semiconductors are compact, and questions are often direct applications.
• Optics, thermal physics and waves each contribute a few questions.
• Units, errors and experimental skills appear regularly and are among the quickest marks available.

The six-step cycle for each chapter

1. Read the concept. NCERT first, for definitions and the logic of each derivation. Know why a formula is true and when it applies.
2. Make a one-page sheet. Formulas with their conditions, units, standard results and sign conventions.
3. Solve NCERT examples and exercises. They check basic understanding quickly.
4. Graded problems. Work through a JEE-level question bank from single-concept problems to mixed ones. This is where most of the time goes.
5. Previous JEE Main questions from that chapter. They show how the concepts are actually tested.
6. Log every error in your notebook, with its cause.

A typical chapter takes one to three weeks, depending on its size and your starting point.

A daily routine

On two or three days a week, replace the concept block with a mixed set from older chapters. Mixed practice is what keeps Class 11 mechanics alive through Class 12.

How many problems is enough?

There is no magic number, but a useful benchmark is 150–250 well-chosen problems per major chapter, fewer for small ones such as units or semiconductors. What matters more than the count:

• Attempt before reading the solution. Give each problem a real try of several minutes.
• Finish to a number. "The method is clear" does not earn marks, particularly in numerical questions. See numerical value questions.
• Re-solve wrong problems a week later. If you get them right unaided, the lesson has stuck.

Building speed

The paper gives you about 2.4 minutes per question across all three subjects. Physics questions often need two to three minutes, so speed matters.

• Recognise standard types. Most questions are a variation on a few dozen standard situations: Atwood machines, blocks on inclines, vertical circles, Kirchhoff networks, lens combinations. Recognising the type saves the first minute.
• Use short cuts that are actually correct. Dimensional checks, limiting cases (what happens if the mass is zero, or the angle is 90°?) and symmetry eliminate options quickly.
• Know common values. sin 37° = 0.6, cos 37° = 0.8, √2 ≈ 1.41, √3 ≈ 1.73, and hc ≈ 1240 eV nm.
• Time your sets. Five problems in twelve minutes is a good target for mixed practice.

Traps that cost marks

Our guide to common physics mistakes covers these in more depth.

Revision

• Revise each chapter's formula sheet within a week of finishing it, again after a month, and then monthly.
• Keep one mixed test a week, covering all completed chapters.
• In the final months, move from chapter-wise work to full papers. The last-month plan shows how.

Quick self-test

1. What are the dimensions of Planck's constant?
2. A ball is projected at 45° with speed 20 m/s (g = 10 m/s²). What is its range?
3. Two 6 Ω resistors are connected in parallel. What is the equivalent resistance?
4. What is the energy of a photon of wavelength 620 nm, in eV?
5. A car moving at 20 m/s is brought to rest uniformly in 4 s. How far does it travel while stopping?
6. A 2 μF capacitor is charged to 10 V. How much energy does it store?

Answers

1. [M L² T⁻¹], since E = hν gives h = E/ν.
2. R = u² sin 90° / g = 400/10 = 40 m.
3. 6 × 6 / (6 + 6) = 3 Ω.
4. E = 1240/620 = 2 eV.
5. Average speed 10 m/s for 4 s gives 40 m.
6. U = ½CV² = ½ × 2 × 10⁻⁶ × 100 = 1 × 10⁻⁴ J.

If you got four or fewer right, begin with mechanics basics before moving to new chapters.

What to do next

• List every physics unit and mark it done, practised or untouched.
• Start the next chapter using the six-step cycle.
• Set up a formula sheet file and an error notebook today.
• Fix a daily physics slot of at least 90 minutes.
• Take one timed mixed set of 10 questions at the end of this week.