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
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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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Let nP and ne be the number of holes and conduction electrons respectively in a semiconductor. Then

(a) nP>ne in an intrinsic semiconductor

(b) nP=ne in an extrinsic semiconductor

(c) nP=ne in an intrinsic semiconductor

(d) ne<nP in an intrinsic semiconductor

Concept Questions :-

Types of semiconductors
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Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that

(a) P and Q are conductors of different materials

(b) P is N-type semiconductor and Q is P-type semiconductor

(c) P is semiconductor and Q is conductor

(d) P is conductor and Q is semiconductor

Concept Questions :-

Types of semiconductors
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In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about 
(a) 1                   (b) 10-1
(c) 10-4              (d) 10-7

Concept Questions :-

Types of semiconductors
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The forbidden gap in the energy bands of germanium at room temperature is about 
(a) 1.1 eV                           (b) 0.1 eV
(c) 0.67 eV                         (d) 6.7 eV 

Concept Questions :-

Energy band theory
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In P-type semiconductor the majority and minority charge carriers are respectively

(a) Protons and electrons           (b) Electrons and protons
(c) Electrons and holes               (d) Holes and electrons

Concept Questions :-

Types of semiconductors
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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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