Question

if a cube of butter is heated sot that it becomes softer and drips out of the container ,it is an example of which change in state

Answer 1

Its a change in state of solid to liquid

the reason is that in a solid state the molecules have little  kinetic energy to move and so they have restricted movement and so it remains solid
once heat is applied the molecules gain enough energy to move and so they turn into a liquid and move according to the laws of physics

hope that helps 

Answer 2

Melting.........................