Units and Measurements is a Class 11 Physics chapter that carries about 4.5% of the Physics questions in NEET. Practise it with 49 questions covering 2 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, Units and Measurements had 27 questions, about 2.1 a year. The most in one paper was 4, in NEET 2020.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 3 |
| NEET 2025 | 3 |
| NEET 2024 | 3 |
| NEET 2023 | 2 |
| NEET 2022 | 4 |
| NEET 2021 | 3 |
| NEET 2020 | 4 |
| NEET 2019 | 1 |
| NEET 2018 | 1 |
| NEET 2017 | 1 |
| NEET 2016 | 0 |
| Re-AIPMT 2015 | 1 |
| AIPMT 2014 | 1 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
The equation s = ut + ½at² is dimensionally:
Answer: C. correct, since every term has the dimension of length
Why: [ut] = [LT⁻¹][T] = [L] and [at²] = [LT⁻²][T²] = [L].
The sum of 12.5 and 0.136, expressed with the proper number of significant figures, is:
Answer: D. 12.6
Why: In addition, the result keeps as many decimal places as the least precise number (one).
The dimensional formula of power is:
Answer: B. [ML²T⁻³]
Why: P = work/time = [ML²T⁻²]/[T].
A zero error in an instrument is an example of a:
Answer: D. systematic error
Why: It affects all the readings in the same way.
Which of the following is a dimensionless quantity?
Answer: B. strain
Why: Strain is defined as the ratio of change in length to original length — both quantities have the same dimension, so their ratio is dimensionless.
The time of 20 oscillations of a pendulum, measured with a stopwatch of least count 0.1 s, is 40.0 s. The error in the period is:
Answer: B. 0.005 s
Why: The error in the total time is spread over 20 oscillations: 0.1/20 = 0.005 s.
The quantity 1/√(μ₀ε₀) has the dimensions of:
Answer: D. velocity
Why: It is the speed of light in vacuum.
If the percentage errors in the measurement of mass and velocity are 2% and 3% respectively, the maximum percentage error in the kinetic energy (½mv²) is:
Answer: C. 8%
Why: Kinetic energy ∝ m v². Maximum error = 2% + 2 × 3% = 8%.
Units and Measurements carries about 4.5% of the Physics questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 27 times, about 2.1 questions a year.
Units and Measurements is a Class 11 Physics chapter in the NCERT syllabus.
NeetVictory has 49 practice questions on Units and Measurements, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
NeetVictory