In intrinsic semiconductor at room temperature, number of electrons and holes are

(a) Equal                 (b) Zero
(c) Unequal              (d) Infinite

Concept Questions :-

Types of semiconductors
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In a semiconductor the separation between conduction band and valence band is of the order of

(a) 100 eV                      (b) 10 eV
(c) 1 eV                          (d) 0 eV

Concept Questions :-

Energy band theory
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The intrinsic semiconductor becomes an insulator at

(a) 0°C                  (b) -100°C 

(c)  300 K               (d) 0 K

Concept Questions :-

Types of semiconductors
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In a good conductor the energy gap between the conduction band and the valence band is

(a) Infinite                        (b) Wide
(c) Narrow                        (d) Zero

Concept Questions :-

Energy band theory
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The impurity atom added to germanium to make it N-type semiconductor is 
(a) Arsenic                    (b) Iridium
(c) Aluminium                (d) Iodine

Concept Questions :-

Types of semiconductors
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When N-type of semiconductor is heated

(a) Number of electrons increases while that of holes decreases

(b) Number of holes increases while that of electrons decreases

(c) Number of electrons and holes remains same

(d) Number of electrons and holes increases equally

Concept Questions :-

Types of semiconductors
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To obtain a P-type germanium semiconductor, it must be doped with 
(a) Arsenic                    (b) Antimony
(c) Indium                     (d) Phosphorus

Concept Questions :-

Types of semiconductors
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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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