7000+ Optoelectronic Devices Multiple Choice Questions Pdf - 1

Question: 1

A PIN diode is frequently used as a

(A) Switching diode for frequencies up to GHz range

(B) Harmonic generator

(C) Voltage regulator

(D) Peak clipper

Question: 2

Which of the following materials is used in light emitting diodes?

(A) Gallium phosphide sulphate

(B) Gallium chromate phosphide

(C) Gallium arsenide phosphate

(D) Gallium arsenide sulphate

Question: 3

In a photoconductive cell, the resistance of the semiconductor material varies with intensity of incident light

(A) Logarithmically

(B) Directly

(C) Inversely

(D) Exponentially

(E) Logarithmically

Question: 4

In which of the following, two optical polarisers, one in front and other in back are needed?

(A) LSI

(B) LED

(C) LCD

(D) LDR

Question: 5

Which of the following devices has the 'negative resistance' characteristic?

(A) Reflex klystron

(B) Magnetron

(C) Gunn diode

(D) P-N-P transistor