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10 Question-Answer on Semiconductors 1.        With the fall of temperature, the forbidden energy gap of a semiconductor (a)     Increases (b)    Decreases (c)     Remains unchanged (d)    Sometime increases and sometimes decreases Ans: ( c) 2.        What is the resistivity of a pure semiconductor at absolute zero? (a)     Zero (b)    Infinity (c)     Same as that of conductors at room temperature (d)    Same as that of insulators at room temperatures Ans: (b) 3.        What enables Ge behave as semiconductor even through all electrons in the valence bond form covalent bonds? It is due to small with of (a)     Valence bond (b)    Conduction band (c)     Forbidden energy gap (d)    None of above. Ans: (c ) 4.  ...