The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is d/2, then the viscous force acting on the ball will be :

NEET UG 2021 · Physics · Question 20

NEET 2021 Physics, question 20

Question 20 of the NEET 2021 paper (code O1) is a Physics question from Mechanical Properties of Fluids. Its idea, Terminal Velocity Calculation, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q20 · Physics

\frac{d}{2}

\frac{3}{2}Mg

Official answer: option 3 · NTA final answer key

Same idea

The only question on Terminal Velocity Calculation

No other NEET paper from 2017–2026 tested this exact idea.

Terminal Velocity Calculation: every question and how it was framed

The chapter

Mechanical Properties of Fluids in ten years of NEET

15 questions from 2017–2026, asked in 10 of 10 papers, about 1.4 a paper. Fluid Viscosity alone had 4.

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The only question on Terminal Velocity Calculation

Mechanical Properties of Fluids in ten years of NEET

Mechanical Properties of Fluids: questions per paper