At zero Kelvin a piece of germanium

(a) Becomes semiconductor

(b) Becomes good conductor

(c) Becomes bad conductor

(d) Has maximum conductivity

Concept Questions :-

Types of semiconductors
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A semiconductor is cooled from T1K to T2K. Its resistance

(a) Will decrease
(b) Will increase
(c) Will first decrease and then increase
(d) Will not change

Concept Questions :-

Types of semiconductors
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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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