Question

NTSE Sample Question Physics Doping is a process of
(a) purifying the semiconductor
(b) making the material crystalline
(c) adding controlled impurities into the material
(d) making the material an insulator

Answer 1

answer is (c) - adding controlled impurities into the material

Answer 2

c)  It is the process of  adding controlled impurities into the material..

impurities do not mean bad ...  it is the process of introducing another semiconductor material into a semiconductor material, carefully, as per expected amount of mixing.