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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 4 August 2021, Shift 1, Physics Q18

Question 18 of 90 in this shift, Physics question 18 of 30, Section A.

The actual length, breadth and thickness ℓ\ell, b and h of a rectangular slab are 0.2 m, 0.12 m and 0.13 m respectively. If ‘ℓ\ell’ is measured by a vernier callipers (zero is on the right of the main scale zero and 8th^{th} vernier division coincides with main scale division when its jaws coincide with each other) ‘b’ and ‘h’ are measured by another vernier scale (4th^{th} vernier division coincide with the main scale but zero on vernier shifts towards left when jaws are closed). The least count for both is 0.01 cm. What is the positive and negative zero error of the instruments ( in cm ) respectively.
  1. (1)0.08, 0.02
  2. (2)0.04, 0.08
  3. (3)0.08, 0.04Official answer
  4. (4)0.02, 0.04

Official answer

Option 3

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.