If ne and nh are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then

(1) ne>> nh               

(2)  ne<< nh  

(3) nenh                 

(4) ne = nh  

Subtopic:  Types of Semiconductors |
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To obtain electrons as majority charge carriers in a semiconductor, the impurity mixed is 
(1) Monovalent         

(2) Divalent

(3) Trivalent               

(4) Pentavalent

Subtopic:  Types of Semiconductors |
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For germanium crystal, the forbidden energy gap in joules is

(1) 1.12×10-19        

(2) 1.76×10-19

(3)  1.6×10-19         

(4) Zero

Subtopic:  Energy Band theory |
 57%
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A pure semiconductor behaves slightly as a conductor at

(1) Room temperature             

(2) Low temperature

(3) High temperature               

(4) Both (b) and (c)

Subtopic:  Types of Semiconductors |
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Which is the correct relation for the forbidden energy gap in the conductor, semiconductor, and insulator

(1) Egc<Eginsulator<Egsc

(2) Egc<Egsc<Eginsulator

(3) Egsc<Eginsulator<Egc

(4) Egsc<Ec<Eginsulator

Subtopic:  Energy Band theory |
 91%
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At room temperature, a P-type semiconductor has

(1) Large number of holes and few electrons

(2) Large number of free electrons and few holes

(3) Equal number of free electrons and holes

(4) No electrons or holes

Subtopic:  Types of Semiconductors |
 79%
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The energy band gap is maximum in

(1) Metals               

(2) Superconductors

(3) Insulators         

(4) Semiconductors

Subtopic:  Energy Band theory |
 92%
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The process of adding impurities to the pure semiconductor is called 
(1) Drouping       

(2) Drooping

(3) Doping           

(4) None of these

Subtopic:  Types of Semiconductors |
 95%
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To a germanium sample, traces of gallium are added as an impurity. The resultant sample would behave like

(1) A conductor

(2) A P-type semiconductor

(3) An N-type semiconductor

(4) An insulator

Subtopic:  Types of Semiconductors |
 91%
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Donor type impurity is found in 
(1) Trivalent elements       

(2) Pentavalent elements

(3) In both the above       

(4) None of these

Subtopic:  Types of Semiconductors |
 75%
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