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%
From NCERT
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The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the 

(1) Variation of scattering mechanism with temperature

(2) Crystal structure

(3) Variation of the number of charge carriers with temperature

(4) Type of bond

Subtopic:  Types of Semiconductors |
 75%
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The charge on a hole is equal to the charge of

(1) Zero               

(2) Proton

(3) Neutron         

(4) Electron

Subtopic:  Types of Semiconductors |
 62%
From NCERT
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A Ge specimen is doped with Al. The concentration of acceptor atoms is ~1021 atoms/m3. Given that the intrinsic concentration of electron hole pairs is ~1019/m3, the concentration of electrons in the specimen is:

1. \(10^{17} / \mathrm{m}^3 \) 2. \(10^{15} / \mathrm{m}^3 \)
3. \(10^4 / \mathrm{m}^3 \) 4. \(10^2 / \mathrm{m}^3\)
Subtopic:  Types of Semiconductors |
 70%
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Which of the following has negative temperature coefficient of resistance 
(1) Copper               

(2) Aluminium

(3) Iron                   

(4) Germanium

Subtopic:  Types of Semiconductors |
 85%
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In semiconductors at a room temperature 

(1) The valence band is partially empty and the conduction band is partially filled

(2) The valence band is completely filled and the conduction band is partially filled

(3) The valence band is completely filled

(4) The conduction band is completely empty

Subtopic:  Energy Band theory |
 70%
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Regarding a semiconductor which one of the following is wrong 

(1) There are no free electrons at room temperature

(2) There are no free electrons at 0 K

(3) The number of free electrons increases with rise of temperature

(4) The charge carriers are electrons and holes

Subtopic:  Types of Semiconductors |
 74%
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