Which of the following is not a property of semiconductors used in electronic devices? - Electronic Devices and Circuits

Electronics and Communication Engineering (ECE) : Electronic Devices and Circuits - Quiz(MCQ)

Which of the following is not a property of semiconductors used in electronic devices?

A)

They donâ€™t emit light

B)

They excite electrons

C)

They have high thermal conductivity

D)

They have variable electrical conductivity

Correct Answer : Option (A) : They donâ€™t emit light

Explanation : Semiconductors excite electrons. They have variable electrical conductivity and high thermal conductivity. Some compound semiconductors also emit light which is popularly known as light-emitting diodes.

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The kinetic energy of photoelectrons emitted by a photo sensitive surface depends on

A)

angle of incidence of radiation

B)

surface conditions of the surface

C)

intensity of the incident radiation

D)

wavelength of the incident radiation

Correct Answer : wavelength of the incident radiation

For radiating ultraviolet rays, LEDs use

A)

gallium arsenide

B)

zinc sulphide

C)

gallium phosphide

D)

None of the above

Correct Answer : zinc sulphide

For an P-N-P transistor in normal operation its junction are biased as

A)

emitter base : reverse, collector base : reverse

B)

emitter base : reverse, collector base : forward

C)

emitter base : forward, collector base : forward

D)

emitter base : forward, collector base : reverse

Correct Answer : emitter base : forward, collector base : reverse

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