Kindly answer the question in the box mentioned below
1  Which is the semi conductor substance?

A    Tin
B    Zinc
C    Magnesium 
D   Germanium

2 The purpose of the control device (switch) in a simple electrical circuit is to.....

A  start (or) stop the flow of current
B            provide the path for the current to flow

C          control the amount of current through load D regulate the rated supply voltage