Semiconductor Diode Quiz-MCQ Leave a Comment / Electronics Multiple choice question MCQ Share this 0% 0 votes, 0 avg 8 Created on September 03, 2022Basic electronics Semiconductor Diode (PN junction) 1 / 25 1.  A semiconductor is formed by ……… bonds. Electrovalent None of the above Co-ordinate Covalent 2 / 25 2. With forward bias to a pn junction , the width of depletion layer ……… Decreases Remains the same Increases None of the above 3 / 25 3. A hole in a semiconductor is defined as ……………. A free electron A free neutron The incomplete part of an electron pair bond A free proton 4 / 25 4.  When a pure semiconductor is heated, its resistance ………….. Remains the same Can’t say Goes down Goes up 5 / 25 5. The addition of trivalent impurity to a semiconductor creates many …….. Bound electrons Holes Valence electrons Free electrons 6 / 25 6. What is the dc output voltage of an unfiltered half wave rectifier whose peak output voltage 9.8v 6.23v 19.6v 9.8v 3.1v 7 / 25 7. A pentavalent impurity has ………. Valence electrons 4 3 5 6 8 / 25 8.  A reverse biased pn junction has resistance of the order of Ω None of the above MΩ KΩ 9 / 25 9. The most commonly used semiconductor is Sulphur Silicon Germanium Carbon 10 / 25 10.  In a semiconductor, current conduction is due to …….. Only holes Only free electrons Holes and free electrons None of the above 11 / 25 11. At absolute temperature, an intrinsic semiconductor has ………. Many holes Many free electrons No holes or free electrons A few free electrons 12 / 25 12. A reverse bias pn junction has ………… Almost no current Very narrow depletion layer Large current flow Very low resistance 13 / 25 13. The forward voltage drop across a silicon diode is about 2.5 V 3 V 0.7 V 5 V 14 / 25 14. The leakage current across a pn junction is due to ………….. Majority carriers None of the above Minority carriers Junction capacitance 15 / 25 15.  The leakage current in a pn junction is of the order of kA mA A µA 16 / 25 16. A semiconductor has generally ……………… valence electrons. 3 6 2 4 17 / 25 17. In an intrinsic semiconductor, the number of free electrons ……… None of the above Is less than the number of holes Is greater than the number of holes Equals the number of holes 18 / 25 18. To a first approximation of a forward-biased diode is treated like a Close switch in series with the battery voltage of 0.7v Lose switch in series with a small resistance and a battery Closed switch with the voltage drop of zero volt Open switch with infinite resistance 19 / 25 19. A forward biased pn junction diode has a resistance of the order of MΩ None of these KΩ Ω 20 / 25 20. Under normal conditions a diode conducts current when it is …………… avalanched saturated reverse biased forward biased 21 / 25 21. A trivalent impurity has ….. valence electrons 6 3 4 5 22 / 25 22. A PN junction acts as a ………. None of the above Unidirectional switch Bidirectional switch Controlled switch 23 / 25 23. in n-type semiconductors the minority current carriers are Free electrons Valence electrons The holes Protons 24 / 25 24. At room temperature, an intrinsic silicon crystal acts approximately as …… An insulator A conductor A piece of copper wire A battery 25 / 25 25. A semiconductor has ………… temperature coefficient of resistance. Negative None of the above Positive Zero Your score is The average score is 44% LinkedIn Facebook Twitter 0% Restart quiz Exit Send feedback Share this