The temperature coefficient of resistance of a semiconductor

(a) Is always positive

(b) Is always negative

(c) Is zero

(d) May be positive or negative or zero

Concept Questions :-

Types of semiconductors
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P-type semiconductor is formed when 
A. As impurity is mixed in Si
B. Al impurity is mixed in Si
C. B impurity is mixed in Ge
D. P impurity is mixed in Ge
(a) A and C                     (b) A and D

(c) B and C                     (d) B and D

Concept Questions :-

Types of semiconductors
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In case of a semiconductor, which of the following statement is wrong 

(a) Doping increases conductivity

(b) Temperature coefficient of resistance is negative

(c) Resisitivity is in between that of a conductor and insulator

(d) At absolute zero temperature, it behaves like a conductor

Concept Questions :-

Types of semiconductors
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Energy bands in solids are a consequence of

(a) Ohm’s Law

(b) Pauli’s exclusion principle

(c) Bohr’s theory

(d) Heisenberg’s uncertainty principle

Concept Questions :-

Energy band theory
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In a P-type semiconductor

(a) Current is mainly carried by holes

(b) Current is mainly carried by electrons

(c) The material is always positively charged

(d) Doping is done by pentavalent material

Concept Questions :-

Types of semiconductors
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At ordinary temperatures, the electrical conductivity of semi conductors in  mho/meter is in the range 
(a)10-3 to 10-4             (b)106 to 109
(c) 10-6 to  10-10          (d) 10-10 to 10-16

Concept Questions :-

Types of semiconductors
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 In a P-type semiconductor, germanium is doped with

(a) Boron                     (b) Gallium
(c) Aluminium              (d) All of these

Concept Questions :-

Types of semiconductors
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GaAs is 

(a) Element semiconductor

(b) Alloy semiconductor

(c) Bad conductor

(d) Metallic semiconductor

Concept Questions :-

Types of semiconductors
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If ne and nh are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then

(a) ne>> nh                (b)  ne<< nh  
(c) nenh                  (d) ne = nh  

Concept Questions :-

Types of semiconductors
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To obtain electrons as majority charge carriers in a semiconductor, the impurity mixed is 
(a) Monovalent          (b) Divalent
(c) Trivalent               (d) Pentavalent

Concept Questions :-

Types of semiconductors
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