The electrical conductivity of a semiconductor

(1) Decreases with the rise in its temperature

(2) Increases with the rise in its temperature

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

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

Subtopic:  Types of Semiconductors |
 76%
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When a semiconductor is heated, its resistance

(1) Decreases

(2) Increases

(3) Remains unchanged

(4) Nothing is definite

Subtopic:  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

(1) 1  MeV

(2)  0.1 MeV

(3) 1 eV 

(4) 15 eV

Subtopic:  Energy Band theory |
 63%
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An N-type semiconductor is

(1) Negatively charged

(2) Positively charged

(3) Neutral

(4) None of these

Subtopic:  Types of Semiconductors |
 64%
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The energy band gap of Si is

(1) 0.70 eV

(2) 1.1 eV

(3) Between 0.70 eV to 1.1 eV

(4) 5 eV

Subtopic:  Energy Band theory |
 56%
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The forbidden energy bandgap in conductors, semiconductors, and insulators are EG1,EG2 and EG3 and respectively. The relation among them is

(1) EG1=EG2 =EG3

(2) EG1<EG2 <EG3

(3) EG1>EG2 >EG3 

(4) EG1<EG2 >EG3

Subtopic:  Energy Band theory |
 90%
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When Ge crystals are doped with phosphorus atom, then it becomes 

(1) Insulator

(2) P-type

(3) N-type

(4) Superconductor

Subtopic:  Types of Semiconductors |
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Let nP and ne be the number of holes and conduction electrons respectively in a semiconductor. Then

(1) nP>ne in an intrinsic semiconductor

(2) nP=ne in an extrinsic semiconductor

(3) nP=ne in an intrinsic semiconductor

(4) ne<nP in an intrinsic semiconductor

Subtopic:  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

1. P and Q are conductors of different materials

2. P is N-type semiconductor and Q is P-type semiconductor

3. P is semiconductor and Q is conductor

4. P is conductor and Q is semiconductor

Subtopic:  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 
(1) 1                   

(2) 10-1

(3) 10-4             

(4) 10-7

Subtopic:  Types of Semiconductors |
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