Which of the following phenomenon occurs when a chalk stick is dipped in ink?

Which phenomenon occurs when a chalk stick is dipped in ink?

Which of the following process will be observed, when a chalk stick is dipped in the solution of ink?

Which one of the following phenomenon occurs when two naked wires of electricity supply line touch other?

Which of the following phenomenon will occure when tow atoms of an element with same spein of electron approach each other ?

Which of the following will give a blue solution when copper is dipped in it?

Which of the following phenomenon can be found only when population studies are conducted ?

Which of the following phenomenon can be found only when population studies are conducted ?