Reasons

Electricity is the assinicial element of the life. (with the passage of time and technology)
Thus switch board is one of the basic element (object) to supply this electricity.
Compared by other object i have chosen-This (switch board) because it is used by every one in their everyday life. ( This is part of everyone's life)
Where as every other object in my list are used according to need, expensive, life style and class.