Semiconductor Diode Quiz-MCQ Leave a Comment / Electronics Multiple choice question MCQ Share this 0% 0 votes, 0 avg 15 Created on September 03, 2022Basic electronics Semiconductor Diode (PN junction) 1 / 25 1. At absolute temperature, an intrinsic semiconductor has ………. Many free electrons No holes or free electrons A few free electrons Many holes 2 / 25 2. With forward bias to a pn junction , the width of depletion layer ……… None of the above Remains the same Increases Decreases 3 / 25 3. A pentavalent impurity has ………. Valence electrons 6 5 4 3 4 / 25 4. The most commonly used semiconductor is Carbon Sulphur Silicon Germanium 5 / 25 5. A hole in a semiconductor is defined as ……………. A free neutron A free proton A free electron The incomplete part of an electron pair bond 6 / 25 6. In an intrinsic semiconductor, the number of free electrons ……… Equals the number of holes None of the above Is less than the number of holes Is greater than the number of holes 7 / 25 7.  The leakage current in a pn junction is of the order of A mA µA kA 8 / 25 8. A semiconductor has ………… temperature coefficient of resistance. Zero None of the above Positive Negative 9 / 25 9. To a first approximation of a forward-biased diode is treated like a Open switch with infinite resistance Lose switch in series with a small resistance and a battery Close switch in series with the battery voltage of 0.7v Closed switch with the voltage drop of zero volt 10 / 25 10. The forward voltage drop across a silicon diode is about 5 V 0.7 V 3 V 2.5 V 11 / 25 11. The addition of trivalent impurity to a semiconductor creates many …….. Bound electrons Holes Free electrons Valence electrons 12 / 25 12. A PN junction acts as a ………. Unidirectional switch Bidirectional switch None of the above Controlled switch 13 / 25 13.  A semiconductor is formed by ……… bonds. None of the above Electrovalent Co-ordinate Covalent 14 / 25 14.  A reverse biased pn junction has resistance of the order of None of the above Ω KΩ MΩ 15 / 25 15. What is the dc output voltage of an unfiltered half wave rectifier whose peak output voltage 9.8v 9.8v 3.1v 6.23v 19.6v 16 / 25 16. A reverse bias pn junction has ………… Almost no current Very low resistance Very narrow depletion layer Large current flow 17 / 25 17. A trivalent impurity has ….. valence electrons 4 6 3 5 18 / 25 18. Under normal conditions a diode conducts current when it is …………… avalanched reverse biased saturated forward biased 19 / 25 19. in n-type semiconductors the minority current carriers are Free electrons Protons The holes Valence electrons 20 / 25 20. A forward biased pn junction diode has a resistance of the order of Ω MΩ None of these KΩ 21 / 25 21. The leakage current across a pn junction is due to ………….. Majority carriers Minority carriers None of the above Junction capacitance 22 / 25 22. A semiconductor has generally ……………… valence electrons. 6 3 2 4 23 / 25 23.  When a pure semiconductor is heated, its resistance ………….. Goes up Can’t say Remains the same Goes down 24 / 25 24.  In a semiconductor, current conduction is due to …….. Holes and free electrons None of the above Only holes Only free electrons 25 / 25 25. At room temperature, an intrinsic silicon crystal acts approximately as …… An insulator A battery A piece of copper wire A conductor Your score is The average score is 35% LinkedIn Facebook Twitter 0% Restart quiz Exit Send feedback Transistor questions and answers Zener Diode MCQ with answers Logic gates MCQ Quiz Basic electronics MCQ question answer Semiconductor PN diode Share this