Class 11 Physics — Chapter 2: Units and Measurements
68 practice questions · 23 Easy · 23 Medium · 22 Hard
Practise Class 11 Physics Chapter 2, "Units and Measurements", with 68 NCERT-aligned multiple-choice questions. The set is split into 23 Easy, 23 Medium and 22 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Units and Measurements" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Units and Measurements, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Physics mastery score. A few sample questions are shown below; sign in free to practise all 68.
Key concepts: Units and Measurements (Class 11 Physics)
This chapter covers the SI system of units, dimensional analysis, significant figures, and errors in measurement.
- SI units
- Seven base units (metre, kilogram, second, ampere, kelvin, mole, candela) from which all derived units are formed.
- Dimensions
- Express a physical quantity in terms of base quantities (M, L, T, …); used to check equations and convert units.
- Dimensional analysis
- Checks the dimensional consistency of equations and derives relations, though it cannot find dimensionless constants.
- Significant figures
- Reflect measurement precision; rules govern how they propagate through calculations and rounding.
- Errors
- Absolute, relative and percentage errors; errors add in sums/differences and combine fractionally in products/quotients.
Key formulas — Units and Measurements
💡 Exam tips for Units and Measurements
- Use dimensional analysis to quickly check whether a formula could be correct (LHS dimensions = RHS).
- In products/quotients, relative (fractional) errors add; in sums/differences, absolute errors add.
Sample questions
The SI unit of force is:
1 Newton = 1 kg·m·s⁻².
The dimensional formula of pressure is:
Pressure = Force/Area = [M L T⁻²]/[L²] = [M L⁻¹ T⁻²].
If the percentage error in measuring the radius of a sphere is 2%, the percentage error in its volume is:
V = (4/3)πr³ ⇒ ΔV/V = 3 × (Δr/r) = 3 × 2% = 6%.
Units and Measurements — FAQs
What are the key concepts in Class 11 Physics Units and Measurements?+
This chapter covers the SI system of units, dimensional analysis, significant figures, and errors in measurement. Key ideas include SI units, Dimensions, Dimensional analysis, Significant figures, Errors.
What does Class 11 Physics Chapter 2 (Units and Measurements) cover on XamBaaz?+
It covers 68 NCERT-aligned MCQs on "Units and Measurements" — 23 Easy, 23 Medium and 22 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Units and Measurements" questions free to practise?+
Yes — sign in with Google to practise "Units and Measurements" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Units and Measurements" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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