The Unit & Measurements chapter in Physics holds a significant importance in the JEE-Main chapter-wise weightage. The chapter will introduce you to Physical Quantities and their SI, CGS, and derived units. The Units, Dimensional Analysis, and Measurements will form the fundamental basis for all physical quantities, you will learn in the subsequent chapters.
- Units and Measurements is the easiest chapter of Physics that can give you around 4-8 marks in the JEE Mains exam.
- The understanding gained from this chapter is also used in other chapters of physics, such as mechanics and electrostatics.
Read More:
- JEE Main 2026 syllabus with chapter-wise weightage & deleted topics (PDF)
- Cover the easiest chapter in the JEE Mains 2026 syllabus
Why Ignoring the Units and Measurement Chapter can Cost you Big in JEE Main Physics?
In the high-stakes world of JEE Main, where every mark counts toward securing admission to IITs and NIT colleges, overlooking the Units and Measurements chapter can be a big mistake. Students often focus on complex topics like mechanics and electromagnetism, but ignore simpler chapters. You can master the Units & Measurement chapter in just a few hours and guarantee 1-2 questions in the JEE Mains 2026 exam correctly.
Read Also: Check the latest changes in the JEE Main Physics Exam Pattern
Most Important Units and Measurement Topics for JEE Main 2026
- Dimensional analysis and measurement errors are the two main sub-topics from which approximately 55%-60% of the questions in the Units and Measurement chapter are asked.
- Questions related to the topic of dimensional analysis will primarily involve determining dimensional formulas, checking the homogeneity of equations, deriving units, and finding unknown quantities.
| Topic | Expected Weightage (%) |
|---|---|
| Dimensional Analysis | 30-35 |
| Errors in Measurement | 25-30 |
| Significant Figures | 15-20 |
| Vernier Caliper & Screw Gauge | 15-20 |
| Units and Systems of Units | 10-15 |
Read More: Attempt JEE Main PYQs on Units, Dimensions, and Measurements
Ques: How many days are enough to complete the Unit & Measurements chapter for the JEE Mains 2026 exam?
Ans: For beginners, usually 4–6 days are enough to complete the Unit & Measurements chapter for the JEE Mains 2026 exam.
- Day 1-2: Concept building and numerical practice with NCERT and HC Verma Physics books
- Day 3-4: Solve at least 5–6 years of PYQs
- Day 5-6: Practice 100+ numericals + mixed revision tests
Units and Measurement Weightage Trend: Last 5 Years Analysis
- Over the past five years (2021–2025), you can see that 1–2 questions have consistently been asked from this chapter in all shifts.
- However, there was a slight dip in 2023, with only one question asked in several shifts, but the pattern of 1–2 questions returned afterwards.
- Therefore, with good practice and a thorough understanding of the concepts related to Units and Measurements, you can easily secure 4-8 marks in the JEE Main exam.
| Year | Approx. Questions | % of Physics |
|---|---|---|
| 2021 | 1-2 | 3-7% |
| 2022 | 1-2 | 3-7% |
| 2023 | 1 | 3-4% |
| 2024 | 1-2 | 3-7% |
| 2025 | 1-2 | 4-6% |
| Year | Question Paper PDF | Solution PDF |
|---|---|---|
| 2024 | Download | Download |
| 2023 | Download | Download |
| 2022 | Download | Download |
| 2021 | Download | Download |
| 2020 | Download | Download |
Ques: Which books are recommended for covering the Unit and Measurements chapter for the JEE Mains 2026 exam?
Ans: According to experts and toppers, the best sources for completing the Unit and Measurements chapter for JEE Mains 2026 are as follows:
- NCERT Class 11 Physics Book (Thorough Reading)
- 10 Years PYQs Practice
- Extra Numerical Practice with H.C. Verma and D.C Pandey Physics Book
Reddit & Student Insights: What Aspirants Say About Units and Measurement
- It is a very important chapter, especially for formula derivation questions. Also gives you a better understanding of how formulas work.
Source: Reddit
- “Don’t memorise all 40 dimensions — derive them as needed. Most will stick after doing formulas.”
Source: Reddit
How to Prepare Units and Measurement for JEE Main 2026 (Expert Strategy)
| Step | Details |
|---|---|
| Concept clarity first | Thoroughly read NCERT Class 11 Chapter 2 |
| Formula & constants list | Memorise SI units, dimensional formulae, error propagation rules, and least count formulae |
| PYQs (minimum years to attempt) | Last 10-15 years |
| Chapter-wise MCQ target (number) | 200-300 |
| Last week's revision approach | Revise formulas, error types, significant figures rules & solve 50 PYQs |
Read More: How to maximise marks in Physics in JEE Main 2026 exam?
Ques: What should be my priority while studying the Units and Measurements chapter for the JEE Mains 2026 exam?
Ans: Units and Measurement is the easiest chapter in Physics, and it can be covered in just a few hours with a little attention to detail. The priority order you should set while studying this chapter is:
- Dimensional Analysis (highest weightage + most useful)
- Errors in Measurement (Percentage error, Propagation rules)
- Vernier Calliper and Screw Gauge (Numerical problems are very scoring)
- Significant Figures
- Units, SI Base Units, Fundamental and Derived Units
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