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Friday, 9 October

JEE Main 2017 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 2 April 2017 (offline), Physics Q30

Question 30 of 90 in this shift, Physics question 30 of 30.

The following observations were taken for determining surface tension T of water by capillary method : diameter of capillary, D=1.25×10−2D=1.25\times10^{-2} m rise of water, h=1.45×10−2h=1.45\times10^{-2} m. Using g=9.80 m/s2g=9.80\ \mathrm{m/s^2} and the simplified relation T=rhg2×103 N/mT=\frac{rhg}{2}\times10^3\ \mathrm{N/m}, the possible error in surface tension is closest to :
  1. (1)0.15%
  2. (2)1.5%Official answer
  3. (3)2.4%
  4. (4)10%

Official answer

Option 2

CBSE answer key (25/04/2017, used for result).

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 (CBSE ran the 2017 exam); 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.