12/12/2016 Multiple Choice Questions and Answers on Semiconductor Theory – Electronics PostHOME CONTACT US PRIVACY POLICY TERMS OF USE Take the Android course HOME BASIC ELECTRONICS TUTORIALS QUESTIONS & ANSWERS COMPUTER NETWORKING TUTORIALS TECH ABOUT US Home Electronics Questions and Answers Multiple Choice Questions and Answers Multiple Choice Questions and Answers on Semiconductor Theory Multiple Choice Questions and Answers on Semiconductor Theory Sasmita October 15, 2015 Multiple Choice Questions and Answers Multiple Choice Questions and Answers on Semiconductor Theory Q1. A semiconductor is formed by ……… bonds. 1. Covalent 2. Electrovalent 3. Co-ordinate 4. None of the above Answer : A Q2. A semiconductor has ………… temperature coefficient of resistance. 1. Positive 2. Zero 3. Negative 4. None of the above Answer : C Q3. The most commonly used semiconductor is ……….. 1. Germanium 2. Silicon 3. Carbon 4. Sulphur Answer : B http://electronicspost.com/multiplechoicequestionsandanswersonsemiconductortheory/ 1/7 it becomes ……… 1. The resistivity of pure germanium under standard conditions is about ………. 1.. 1. 6 4. Remains the same 4. Goes up 2. Can’t say Answer : B Q8. 4 Answer : D Q5. Ω cm 5. The strength of a semiconductor crystal comes from ……. 3 3.. p-type semiconductor 4. Ω cm Answer : B Q6. Forces between protons 3. 1. None of the above Answer : C Q9. Addition of pentavalent impurity to a semiconductor creates many ……. Forces between nuclei 2. 2 2. its resistance …………. 1. 3 x 106 6. Free electrons 2. 6 x 104 2. Ω cm 7. Goes down 3.com/multiplechoicequestionsandanswersonsemiconductortheory/ 2/7 . 1. 6 x 10-4 8. Ω cm 3. The resistivity of a pure silicon is about …………… 1. 3 x 105 Ω m 4. Valence electrons 4.12/12/2016 Multiple Choice Questions and Answers on Semiconductor Theory – Electronics Post Q4. When a pentavalent impurity is added to a pure semiconductor. An intrinsic semiconductor 3. A semiconductor has generally ……………… valence electrons. n-type semiconductor Answer : D Q10.. When a pure semiconductor is heated. 6 x 10-8 Ω cm Answer : B Q7. Bound electrons http://electronicspost. Holes 3. 60 4. 100 Ω cm 2. Electron-pair bonds 4. 6000 Ω cm 3. An insulator 2. 6 4. The impurity level in an extrinsic semiconductor is about …. Addition of trivalent impurity to a semiconductor creates many ……. Free electrons 3. 4 4. Valence electrons 4. 1 atom for 108 atoms 3. None of the above Answer : C Q13. A free electron 2. 4 2. valence electrons 1. Decreases 4. A free neutron Answer : B Q16. A trivalent impurity has …. A pentavalent impurity has ………... None of the above http://electronicspost. Positively charged 2. 5 3. An n-type semiconductor is ……… 1. of pure semiconductor. 6 Answer : B A12. Negatively charged 3. Holes 2. 1. 1 atom for 100 atoms Answer : B Q17. 1 atom for 104 atoms 4. The incomplete part of an electron pair bond 3. Valence electrons 1.12/12/2016 Multiple Choice Questions and Answers on Semiconductor Theory – Electronics Post Answer : A Q11. Increases 3. 1. A hole in a semiconductor is defined as ……………. 3 2. 3 Answer : D A14... Bound electrons Answer : A Q15. As the doping to a pure semiconductor increases. 10 atoms for 108 atoms 2. 1. Electrically neutral 4. the bulk resistance of the semiconductor ………. Remains the same 2. A free proton 4. 5 3.com/multiplechoicequestionsandanswersonsemiconductortheory/ 3/7 . 1. None of the above Answer : A Q21. None of the above Answer : C Q20. Holes and free electrons 4. Ω 2. Pressure 3. The random motion of holes and free electrons due to thermal agitation is called ………. A forward biased pn junction diode has a resistance of the order of 1.com/multiplechoicequestionsandanswersonsemiconductortheory/ 4/7 . MΩ 4.. A hole and electron in close proximity would tend to ………. -ve terminal to p and –ve terminal to n 4. Only holes 2. The barrier voltage at a pn junction for germanium is about ……… 3. Only free electrons 3. current conduction is due to ……. 5 V http://electronicspost. Attract each other 3. Ionisation 4. 1. In a semiconductor. None of the above Answer : B Q19. -ve terminal to p and +ve terminal to n 3. Have no effect on each other 4. kΩ 3. 1. None of the above Answer : A Q22. None of the above Answer : A Q23. 1.12/12/2016 Multiple Choice Questions and Answers on Semiconductor Theory – Electronics Post Answer : C Q18. Diffusion 2. Repel each other 2. +ve terminal to p and –ve terminal to n 2. The battery connections required to forward bias a pn junction are …… 1. A reverse bias pn junction has ………… 1. A pn junction acts as a ………. None of the above Answer : C Q27.12/12/2016 Multiple Choice Questions and Answers on Semiconductor Theory – Electronics Post 4. Ω 2. there is a shortage of ……. Large current flow Answer : B Q26. Donor ions 4. 1. Unidirectional switch 4. Decreases 2. In the depletion region of a pn junction. Very narrow depletion layer 2. the width of depletion layer ……… 1.com/multiplechoicequestionsandanswersonsemiconductortheory/ 5/7 . Increases http://electronicspost.. Almost no current 3. Acceptor ions 2. A reverse biased pn junction has resistance of the order of 1. MΩ 4. Controlled switch 2. Bidirectional switch 3. Holes and electrons 3. None of the above Answer : B Q30. With forward bias to a pn junction . None of the above Answer : A Q29. 3 V Answer : D Q24. the pronounced effect is on…… 1. Junction capacitance 4. Junction capacitance 2. Majority carriers 4. 3 V 5. When the temperature of an extrinsic semiconductor is increased. 1. Minority carriers 3. 1. Majority carriers 3. None of the above Answer : B Q25. The leakage current across a pn junction is due to …………. Very low resistance 4.. None of the above Answer : C Q28. kΩ 3. Zero 6. Minority carriers 2. None of the above Answer : A Q33. an intrinsic semiconductor has ………. Aa 2. In an intrinsic semiconductor. Many free electrons only 4. A conductor 3. None of the above Answer : A Q31. No holes or free electrons Answer : D Q35. Remains the same 4. Many free electrons 4. Is less than the number of holes 4. 1. At room temperature. Many holes 3. an intrinsic silicon crystal acts approximately as …… 1. At room temperature. µA Answer : D Q32. A few free electrons and holes 3. The leakage current in a pn junction is of the order of 1.12/12/2016 Multiple Choice Questions and Answers on Semiconductor Theory – Electronics Post 3. A piece of copper wire Answer : C http://electronicspost. the number of free electrons ……… 1. No holes or free electrons Answer : B Q34.com/multiplechoicequestionsandanswersonsemiconductortheory/ 6/7 . kA 4. Is greater than the number of holes 3. mA 3. At absolute temperature. A few free electrons 2. Equals the number of holes 2. An insulator 4. A battery 2. 1. an intrinsic semiconductor has ………. Many holes only 2. 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