What is streamline and turbulent flow?

Consider the configuration of a stationary water tank of cross-section area $A_0$ and a small bucket as shown in figure below;

What should be the speed $v$ of the bucket, so that the water leaking out of a hole of cross-section area $A$ (as shown) from the water tank does not fall outside the bucket?

(Take, $h=5 \mathrm{m}, H=5 \mathrm{m}, \mathrm{g}=10 \mathrm{m} {\mathrm{s}}^{-2}, A=5 {\mathrm{cm}}^2$ and $A_0=500 {\mathrm{cm}}^2$).

Define terminal velocity. Explain the observed rise of air bubbles in a liquid.

If the approximate viscosity of the oil for the following case is $\mathrm{\lambda } \times {10}^{–2} \mathrm{Ns} {\mathrm{m}}^{-2}$ then find $\mathrm{\lambda }$:

A cubical block of side $a$ and density $\rho$ slides over a fixed inclined plane with constant velocity $v$. There is a thin film of a viscous fluid of thickness $t$ between the plane and the block. Then, the coefficient of viscosity of the thin film will be: (Acceleration due to gravity is $g$)

A cubical block of side $\text{'}a\text{'}$ and density $\text{'}p\text{'}$ slides over a fixed inclined plane with constant velocity $\text{'}v\text{'}.$ There is a thin film of viscous fluid of thickness $\text{'}t\text{'}$ between the plane and the block. Then the coefficient of viscosity of the thin film will be: