(A) A party filled valence band and totally empty conduction band (X)
(B) A completely filled valence band a totally empty conduction band and a very wide forbidden band (X)
(C) A completely filled valence band a partially filled conduction band and a narrow forbidden band (
)
(D) A partly filled valence band a totally empty conduction band and a wide forbidden band (X)
Answers: On the basis of band theory of solid the semiconductors have A completely filled valence band a partially filled conduction band and a narrow forbidden band .
