The excess pressure inside a soap bubble is twice the excess pressure inside the second soap bubble. The volume of the first bubble is $n$ times the volume of the second, where $n$ is,

Which of the following graphs may represent the relation between the capillary rise $h$ and the radius $r$ of the capillary?

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Water rises in a vertical capillary tube up to a length of $10 \mathrm{cm}$. If the tube is inclined at $45°$, the length of water risen in the tube will be,

The viscous force acting between the two layers of a liquid is given by,

$\frac{F}{A}=-\mathrm{\eta }\frac{\mathrm{d}v}{\mathrm{d}z}$

This $\frac{F}{A}$ may be called