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Saturday, 31 October

JEE Main 2023 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 6 April 2023, Shift 2, Physics Q31

Question 31 of 90 in this shift, Physics question 1 of 30, Section A.

A 2 meter long scale with least count of 0.2 cm is used to measure the locations of objects on an optical bench. While measuring the focal length of a convex lens, the object pin and the convex lens are placed at 80 cm mark and 1m mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at 180 cm mark. The % error in the estimation of focal length is:
  1. (1)0.51
  2. (2)0.85
  3. (3)1.02
  4. (4)1.70Official answer

Official answer

Option 4

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 108 of the 174 JEE Main shifts held from 2017 to 2026.