The spherical shape of a rain-drop is due to

In most liquids,with a rise in temperature,the surface tension of a liquid

$A$ rectangular film of liquid is expanded from $(5 \text{ cm} \times 4 \text{ cm})$ to $(7 \text{ cm} \times 8 \text{ cm})$. If the work done is $3 \times 10^{-4} \text{ J}$,the surface tension of the liquid is (nearly):

Why is the surface tension of antiseptics kept low? Explain.

The work done in increasing the size of a soap film from $10 \, cm \times 6 \, cm$ to $10 \, cm \times 11 \, cm$ is $3 \times 10^{-4} \, J$. The surface tension of the film is:

What is the ratio of the surface tension force acting on the curved part to that on the flat part?