Column-I (Electrical Properties) Column-II (Materials)A)Pure crystal of silicon at 0 Kp)Semi conductor – p-holes carry currentB)Pure crystal of silicon at 400 Kq)Semi conductor – electrons carry currentC)Silicon crystal doped with arsenic impurityr)InsulatorD)Silicon crystal dopped with galliums)Semiconductor-equal number of p-holes andelectrons carry current (A)(B)(C)(D)1)rsqp2)pqrs3)sqrp4)srqp

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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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