List of top Physics Questions on Viscosity asked in BITSAT

Water is flowing on a horizontal fixed surface such that its flow velocity varies with y (vertical direction) as v = k((2y²)/(a²) - (y³)/(a³)). If coefficient of viscosity for water is η, what will be the shear stress between layers of water at y = a?
Water is flowing on a horizontal fixed surface such that its flow velocity varies with \(y\) (vertical direction) as \[ v = k\!\left(\frac{2y^2}{a^2}-\frac{y^3}{a^3}\right). \] If coefficient of viscosity for water is \(\eta\), what will be the shear stress between layers of water at \(y=a\)?
A large drop of oil (density 0.8 g/cm³ and viscosity \( \eta_0 \)) floats up through a column of another liquid (density 1.2 g/cm³ and viscosity \( \eta_L \)). Assuming that the two liquids do not mix, the velocity with which the oil drop rises will depend on:
Viscosity is the property of a liquid due to which it:

A spherical ball is dropped in a long column of viscous liquid. The speed v of the ball as a function of time t may be best represented by