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Electronic Devices and Circuits

Electronic Devices and Circuits
Forbidden energy gap in germanium at 0 K is about

0.78 eV
2 eV
5 eV
10 eV

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Electronic Devices and Circuits
Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

Normal to both current and magnetic field
Antiparallel to magnetic field
In arbitrary direction
In the direction of current

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Electronic Devices and Circuits
How many free electrons does a p type semiconductor has?

Any of the above
Those produced by doping as well as thermal energy
Only those produced by thermal energy
Only those produced by doping

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Electronic Devices and Circuits
An electron in the conduction band

Loses its charge easily
Has lower energy than the electron in the valence band
Has higher energy than the electron in the valence band
Jumps to the top of the crystal

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Electronic Devices and Circuits
The amount of photoelectric emission current depends on

Frequency of incident radiation
Intensity of incident radiation
Both frequency and intensity of incident radiation
None of these

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Electronic Devices and Circuits
Permalloy is

A polymer
A variety of stainless steel
A nickel an iron alloy having high permeability
A conon-ferrous alloy used in aircraft industry

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