At which of the following temperatures,the value of surface tension of water is minimum in $^oC$?

What mass should be suspended from the wire $CD$ to keep it in equilibrium?

If the work done in increasing the size of a soap film from $10\;cm \times 6\;cm$ to $10\;cm \times 11\;cm$ is $2 \times 10^{-4}\;J$,then the surface tension is:

$A$ wire of length $10 \text{ cm}$ is gently placed horizontally on the surface of water having surface tension of $75 \times 10^{-3} \text{ N/m}$. What force is required to just pull up the wire from the water surface?

Small liquid drops assume a spherical shape because

Surface tension may be defined as