Units And Measurements — JEE Main Previous Year Questions

How many JEE Main questions come from Units And Measurements?

Units And Measurements has contributed 214 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 19 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 214 questions carries a written, step-by-step solution, and each is tagged to Units And Measurements within Physics, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Units And Measurements questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 214 Units And Measurements questions (with full written solutions) are available in practice.

1. Question 1 · JEE Main 2026

   Keeping the significant figures in view, the sum of the physical quantities 52.01 m, 153.2 m and 0.123 m is :
   1. (A)205.3 m
   2. (B)205 m
   3. (C)205.333 m
   4. (D)205.33 m
   Show answerAnswer

   Answer: (A) 205.3 m

2. Question 2 · JEE Main 2026

   In an experiment, a set of readings are obtained as follows - 1.24 mm, 1.25 mm, 1.23 mm, 1.21 mm. The expected least count of the instrument used in recording these readings is _______ mm.
   1. (A)0.01
   2. (B)0.05
   3. (C)0.001
   4. (D)0.1
   Show answerAnswer

   Answer: (A) 0.01

3. Question 3 · JEE Main 2026

   The speed of a longitudinal wave in a metallic bar is 400 m/s. If the density and Young's modulus of the bar material are increased by 0.5% and 1%, respectively then the speed of the wave is changed approximately to ______ m/s.
   1. (A)398
   2. (B)402
   3. (C)401
   4. (D)399
   Show answerAnswer

   Answer: (C) 401

4. Question 4 · JEE Main 2026

   Match List - I with List - II . List – I List – II A. Coefficient of viscosity B. Surface tension C. Pressure D. Surface energy I. [ML −1 T −2 ] II. [ML 2 T −2 ] III. [ML 0 T −2 ] IV. [ML −1 T −1 ] Choose the correct answer from the options given below :
   1. (A)A-I, B-II, C-IV, D-III
   2. (B)A-IV, B-III, C-I, D-II
   3. (C)A-IV, B-I, C-II, D-III
   4. (D)A-I, B-III, C-II, D-IV
   Show answerAnswer

   Answer: (B) A-IV, B-III, C-I, D-II

5. Question 5 · JEE Main 2026

   In a screw gauge the zero of the main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There are 100 divisions in circular scale and pitch of screw gauge is 0.1 mm. When diameter of a sphere is measured, the reading of main scale is 5 mm and 50th division of circular scale coincides with the reference line of main scale. The diameter of sphere is ______ mm.
   1. (A)5.045
   2. (B)5.055
   3. (C)5.450
   4. (D)5.550
   Show answerAnswer

   Answer: (A) 5.045

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