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Electronic Devices and Circuits

Electronic Devices and Circuits
At room temperature the current in an intrinsic semiconductor is due to

Electrons
Ions
Holes
Holes and electrons

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Electronic Devices and Circuits
The sensitivity of human eyes is maximum at

White portion of spectrum
Violet portion of spectrum
Red portion of spectrum
Green portion of spectrum

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Electronic Devices and Circuits
Which of the following has highest resistivity?

Mineral oil
Mica
Air
Paraffin wax

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Electronic Devices and Circuits
In a bipolar transistor, the emitter base junction has

Zero bias
Forward bias
Reverse bias
Zero or reverse bias

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

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

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Electronic Devices and Circuits
Permalloy is

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

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