Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity 
(a) Decreases                     (b) Increases
(c) Remains unchanged       (d) Becomes zero

Concept Questions :-

Types of semiconductors
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A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

(a) Resistance of each increases

(b) Resistance of each decreases

(c) Resistance of copper increases while that of germanium decreases

(d) Resistance of copper decreases while that of germanium increases

Concept Questions :-

Types of semiconductors
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To obtain P-type Si semiconductor, we need to dope pure Si with 
(a) Aluminium                 (b) Phosphorous
(c) Oxygen                     (d) Germanium

Concept Questions :-

Types of semiconductors
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Electrical conductivity of a semiconductor

(a) Decreases with the rise in its temperature

(b) Increases with the rise in its temperature

(c) Does not change with the rise in its temperature

(d) First increases and then decreases with the rise in its temperature

Concept Questions :-

Types of semiconductors
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When a semiconductor is heated, its resistance

(a) Decreases                    (b) Increases
(c) Remains unchanged      (d) Nothing is definite

Concept Questions :-

Types of semiconductors
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In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of

(a) 1  MeV                  (b)  0.1 MeV
(c) 1 eV                      (d) 15 eV

Concept Questions :-

Energy band theory
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A N-type semiconductor is

(a) Negatively charged        (b) Positively charged
(c) Neutral                         (d) None of these

Concept Questions :-

Types of semiconductors
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The energy band gap of Si is

(a) 0.70 eV
(b) 1.1 eV
(c) Between 0.70 eV to 1.1 eV
(d) 5 eV

Concept Questions :-

Energy band theory
Please attempt this question first.

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The forbidden energy band gap in conductors, semiconductors and insulators are EG1,EG2 and EG3 and respectively. The relation among them is

(a) EG1=EG2 =EG3                (b) EG1<EG2 <EG3

(c) EG1>EG2 >EG3                 (d) EG1<EG2 >EG3

Concept Questions :-

Energy band theory
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When Ge crystals are doped with phosphorus atom, then it becomes 
(a) Insulator                  (b) P-type
(c) N-type                     (d) Superconductor

Concept Questions :-

Types of semiconductors
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