$1.$ Define viscosity and surface tension

$2.$ List at least four $(4)$ important examples of the phenomenon of surface tension

$3.$ What does the coefficient of compressibility of a fluid represent?

$4.$ Define viscosity and explain what causes it in fluids $($liquids and in gases$)?$

$5.$ Explain how the power dissipated will change with an increase in the bearing temperature

$6.$ Consider two identical small glass balls dropped into two identical containers, one filled with water and the other with oil. Explain which ball will reach the bottom of the container first

$7.$ A square metal plate $1\mathrm{.}8$ m side and $1\mathrm{.}8$ mm thick weighing $60$ N is to be lifted through a vertical gap of $30$ mm of infinite extent. The oil in the gap has a specific gravity of $0\mathrm{.}95$ and viscosity of $\backslash (3\backslash$mathrm$\{$~N$\}.\backslash$mathrm$\{$s$\}/\backslash$mathrm$\{$m$\}^\{2\}\backslash ).$

If the metal plate is to be lifted at a constant speed of $\backslash (0\mathrm{.}12\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ),$ determine

a$.$ the force with which the plate is moved

b$.$ the power required to lift the plate.