Hairs of a shaving brush cling together when it is removed from water due to

Explain why is hot soup more tasty than the colder one?

Two glass plates of area $10^{-2} \,m^2$ have a $10 \,cm$ thick water film between them. The surface tension of water is $70 \times 10^{-3} \,N/m$. The force required to separate the two glass plates from each other is (in $\,N$)

An iron needle slowly placed on the surface of water floats because

Define surface tension with its formula in the context of intermolecular forces.

$A$ square frame of each side $L$ is dipped in a soap solution and taken out. The force acting on the film formed is ($T$ = surface tension of soap solution). (in $TL$)