SI unit of the coefficient of viscosity is___________________?
Correct answer: B. Kg m-1.S-1
- A. Kg.m.S-1
- B. Kg m-1.S-1
- C. Kg.m.S
- D. Kg-1.m-1.S-1
Explanation
From viscous force F = ηAv/l, η = Fl/(Av), giving units kg m s^-2 × m divided by m² × m s^-1 = kg m^-1 s^-1. Option a has the wrong power of metre, so students selecting it usually remember only part of the viscosity unit.
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Fluid drag is the resistive force exerted by a liquid or gas on an object moving through it, and its value depends on speed, fluid density, shape and exposed area. Questions examine drag at low and high speeds, terminal velocity when drag balances weight, and the difference between drag and ordinary solid friction.
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