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Column-I
(Electrical Properties) Column-II
(Materials)
A) Pure crystal of silicon at 0 K p) Semi conductor – p-holes carry current
B) Pure crystal of silicon at 400 K q) Semi conductor – electrons carry current
C) Silicon crystal doped with arsenic impurity r) Insulator
D) Silicon crystal dopped with gallium s) Semiconductor-equal number of p-holes and
electrons carry current
(A) (B) (C) (D)
1) r s q p
2) p q r s
3) s q r p
4) s r q p

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answer is A.

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Detailed Solution

At 0 K pure silicon acts as insulator At 400 K pure silicon acts as semiconductor, equal no of P-holes and electrons carry current Si doped with As - semiconductor - electrons carry current.

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