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Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 4 April 2025, Shift 2, Physics Q26

Question 26 of 75 in this shift, Physics question 1 of 25, Section A.

For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains 300 equal divisions equals to 15 cm. The vernier scale attached to the microscope has 25 divisions equals to 24 divisions of main scale. The least count (LC) of the travelling microscope is (in cm) :
  1. (1)0.001
  2. (2)0.002Official answer
  3. (3)0.0025
  4. (4)0.0005

Official answer

Option 2

NTA final key.

Chapter
Units and Measurements
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.