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Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 3 April 2025, Shift 2, Physics Q32

Question 32 of 75 in this shift, Physics question 7 of 25, Section A.

A solid steel ball of diameter 3.6 mm acquired terminal velocity 2.45×10−22.45 \times 10^{-2} m/s while falling under gravity through an oil of density 925 kg m−3925\ \mathrm{kg\,m^{-3}}. Take density of steel as 7825 kg m−37825\ \mathrm{kg\,m^{-3}} and g as 9.8 m/s29.8\ \mathrm{m/s^2}. The viscosity of the oil in SI unit is
  1. (1)1.68
  2. (2)1.99Official answer
  3. (3)2.18
  4. (4)2.38

Official answer

Option 2

NTA final key.

Chapter
Mechanical Properties of Fluids
Topic
Viscosity
Idea tested
Falling Sphere Viscometry

Same topic in other shifts

All Viscosity questions
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  2. 8 Apr 2026, Shift 2 · Q34A spherical liquid drop of radius RR acquires the terminal velocity v1v_1 when falls through a gas of viscosity η\eta. Now the drop is…MediumSingle correct
  3. 9 Apr 2024, Shift 2 · Q40A spherical ball of radius 1×10−41\times10^{-4} m and density 105 kg/m310^5\ \mathrm{kg/m^3} falls freely under gravity through a distance hh before…HardSingle correct
  4. 31 Jan 2024, Shift 1 · Q37A small steel ball is dropped into a long cylinder containing glycerine. Which one of the following is the correct representation of the…EasySingle correctHas a figure
  5. 31 Jan 2024, Shift 2 · Q37A small spherical ball of radius rr, falling through a viscous medium of negligible density has terminal velocity 'v'. Another ball of…MediumSingle correct
  6. 6 Apr 2023, Shift 1 · Q33A small ball of mass M and density ρ\rho is dropped in a viscous liquid of density ρ0\rho_0. After some time, the ball falls with a…EasySingle correct

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.