Which of the following is not an assumption for an ideal fluid flow for which Bernoulli's principle is valid?

What type of fluid can be applied in Bernoulli's equation?

The lift of an airplane is based on

Does it matter if one uses gauge instead of absolute pressures in applying Bernoulli's equation? Explain.

$A$ liquid enters at point $A_{1}$ with a speed of $3.5 \ m/s$ and leaves at point $A_{2}$. Find the height attained by the liquid above point $A_{2}$ (in $cm$). (in $.25$)

Water is flowing through a horizontal tube as shown in the figure. Its diameters at two points are $0.3\,m$ and $0.1\,m$ respectively. The pressure difference between these two points is equal to $0.8\,m$ of water column. Find the rate of flow of water in the tube in $ltr/s$.