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Semiconductor Electronics Chapter 14
Quiz 1
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When a pure semiconductor is heated, its resistance
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Goes down.
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Goes up.
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Remains the same.
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None of the above.
What is the order of forbidden gap in the energy bands of silicon?
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3.1 eV
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0.1 eV
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2.1 eV
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1.1 eV
The densities of electrons and holes in an extrinsic semiconductor are 8 x 1015 cm-3 and 5 x 1012 cm-3 respectively. The mobilities of electrons and holes are respectively 23 x 103 cm3 / Vs and 102 cm3 / Vs. Which type of semiconductor is it?
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p-type only
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n-type only
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either n or p type
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both n and p type
A semiconductor is formed by
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Covalent bonds
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Electrovalent bonds
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Coordinate bonds
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None of above
Arrange the materials in ascending order of energy band gaps
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conductor, semiconductor, insulator
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insulator, semiconductor, conductor
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semiconductor, conductor, insulator
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insulator, conductor, semiconductor
In a semiconductor, current conduction is due
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Only to holes.
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Only to electrons
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To holes and electrons
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None of the above
Electrons moving like molecules of a gas exist in:
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all solids
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covalent solids
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metallic solids
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ionic solids
An n-type semiconductor is
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Not charged at all
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Positively charged
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Electrically neutral
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Negatively charged
Mobilities of electrons and holes in a sample of intrinsic germanium semiconductor at room temperature are 0.36m2/volt-sec and 0.17 m2/volt-sec respectively. If the electron and hole densities are each equal to 2.5 X 1019/m3, the conductivity is.
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1.22 S/m
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3.12 S/m
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4.12 S/m
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2.12 S/m
In a semiconductor, the energy gap between valence band and conduction band is about
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10 eV
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5 eV
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1 eV
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15 eV
0 h : 0 m : 1 s
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