Cosθi^ + Sinθj^ is a_________________?

A. Vector
B. Position Vector
C. Vector in the direction at angle θ with an x-axis
D. The unit vector in the direction at angle θ with an x-axis

On the basis of band theory of solids the semiconductors have _____________________?

A. A party filled valence band and totally empty conduction band
B. A completely filled valence band a totally empty conduction band and a very wide forbidden band
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

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