Physics - Units and Dimensions
Practise 18 JEE Advanced previous year questions on Units and Dimensions, compiled from papers spanning 2007 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Advanced tests.
Units and Dimensions has been asked in 16 of the 27 years of JEE Advanced papers analysed (2000–2026), with 18 questions in all. 67% of them were easy, 28% moderate and 6% tough. Most of its questions came from 2018, with 2 questions that year. In the last three years (2024–2026) it had 3 questions across 6 papers, about 0.5 per paper.
The chapter's 2 topics are not weighted equally: Dimensions (17 questions, 94%) and Units (1 question, 6%) have been asked the most. Dimensions has also led over the last five years, with 4 questions. Dimensions has produced the most tough questions (1).
- 1In a new system of units, the units of mass, length, time and current are kg, m, s and A, respectively. If and are the permeability and perm2026 (Paper 2)Units
- 2A temperature difference can generate e.m.f. in some materials. Let be the e.m.f. produced per unit temperature difference between the ends 2025 (Paper 2)Dimensions
- 3A dimensionless quantity is constructed in terms of electronic charge , permittivity of free space , Planck's constant and speed of light . 2024 (Paper 1)Dimensions
- 4Young s modulus of elasticity Y is expressed in terms of three derived quantities, namely, the gravitational constant G , Planck s constant 2023 (Paper 2)Dimensions
- 5In a particular system of units, a physical quantity can be expressed in terms of the electric charge e , electron mass m e . Planck s const2022 (Paper 2)Dimensions
- 6A physical quantity S is defined as S = E B 0 . where E is electric field, B is magnetic field and 0 is the permeability of free space. The 2021 (Paper 2)Dimensions
- 7Sometimes it is convenient to construct a system of units so that all quantities can be expressed in terms of only one physical quantity. In2020 (Paper 1)Dimensions
- 8Let us consider a system of units in which mass and angular momentum are dimensionless. If length has dimension of L , which of the followin2019 (Paper 1)Dimensions
- 9Paragraph: In electromagnetic theory, the electric and magnetic phenomena are related to each other. Therefore, the dimensions of electric a2018 (Paper 1)Dimensions
- 10Paragraph: In electromagnetic theory, the electric and magnetic phenomena are related to each other. Therefore, the dimensions of electric a2018 (Paper 1)Dimensions
- 11Consider an expanding sphere of instantaneous radius R whose total mass remains constant. The expansion is such that the instantaneous densi2017 (Paper 2)Dimensions
- 12A length - scale l depends on the permittivity of a dielectric material, Boltzmann constant k B , the absolute temperature T, the number per2016 (Paper 1)Dimensions
- 13Planck constant h , speed of light c and gravitational constant G are used to form a unit of length L and a unit of mass M . Then the correc2015 (Paper 1)Dimensions
- 14In terms of potential difference V , electic current I , permittivity 0 , permeability 0 and speed of light c , the dimensionally correct eq2015 (Paper 2)Dimensions
- 15To find the distance d over which a signal can be seen clearly in foggy conditions, a railways engineer uses dimensional analysis and assume2014 (Paper 1)Dimensions
- 16Match List I with List II and select the correct answer using the codes given below the lists: List I List II a. Boltzmann constant p. ML 2 2013 (Paper 2)Dimensions
- 17Paragraph: A dense collection of equal number of electrons and positive ions is called neutral plasma. Certain solids containing fixed posit2011 (Paper 1)Dimensions
- 18Some physical quantities are given in Column I and some possible SI units in which these quantities may be expressed are given in Column II.2007 (Paper 1)Dimensions
Frequently Asked Questions
1.How many questions are available for Units and Dimensions?
This chapter includes 18 questions compiled from JEE Advanced papers spanning 2007 to 2026.
2.Are these questions only from JEE Advanced, or from other exams too?
These are JEE Advanced questions specifically for the Units and Dimensions chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Units and Dimensions an important chapter for JEE Advanced Physics?
Units and Dimensions has appeared in 16 of the 21 years of JEE Advanced papers covered here, with 18 questions across 17 papers - about one per paper it appears in.
4.What is the difficulty level of Units and Dimensions questions in JEE Advanced?
Of the 18 questions analysed for this chapter, 67% are easy, 28% moderate and 6% tough. 2018 had the most, with 2 questions.
5.Which topics in Units and Dimensions should I focus on?
These topics have carried the most weightage in Units and Dimensions:
- Dimensions - 17 questions (94%)
- Units - 1 question (6%)
- Dimensions has produced the most tough questions (1).
6.Is Units and Dimensions's weightage in JEE Advanced going up or down?
Across all 17 papers analysed, Units and Dimensions has averaged about 1.1 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.5 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.