Semiconductor Diode Question & AnswersSeptember 13, 2021 By Wat Electrical Leave a Comment This article lists 100 Semiconductor Diode MCQs for engineering students. All the Semiconductor Diode Questions & Answers given below includes solution and link wherever possible to the relevant topic.The intrinsic and extrinsic are the two types of semiconductors, the N-type and the P-type are two types of extrinsic semiconductors. When we join P and N-type semiconductors together, the PN-junction will form at the border.The free electrons are majority carriers and holes are minority carriers in an N-type semiconductor whereas the free electrons are minority carriers and holes are majority carriers in a P-type semiconductor. 1). The varactor diode is also called a ___________Varicap diodeTuning diodeParametric diodeAll of the aboveHintThe varactor diode is also called a varicap or tuning or parametric diode Read more about Varactor Diode 2). Which one of the following diodes is also called a hot carrier diode?Schottky diodePN diodePIN diodeNone of the aboveHintThe Schottky diode is also called a hot carrier diode 3). What are the advantages of C-filter?Low-costGood characteristicsSmall in sizeAll of the aboveHintThe advantages of C-filter are low cost, it has good characteristics, and small in size 4). Which one of the following is a semiconductor material?GermaniumSiliconCarbonAll of the aboveHintThe germanium, carbon, silicon are few semiconductor materials 5). Which one of the following is a majority current carrier in N-type semiconductors?Free electronsHolesBoth a and bNone of the aboveHintThe free electrons are the majority current carriers in N-type semiconductor 6). In which one of the following diode the electricity flows in one direction?P-N junction diodeZener diodeBoth a and bNone of the aboveHintIn the PN junction diode the electricity flows in one direction 7). Which one of the following diodes is used for rectification?P-N junction diodeZener diodeBoth a and bNone of the aboveHintThe PN junction diode is used for rectification 8). Which one of the following semiconductors is a pure semiconductor?IntrinsicExtrinsicBoth a and bNone of the aboveHintThe purity of intrinsic semiconductors is pure 9). The density of electrons in an intrinsic semiconductor is ____________ the density of holesLess thanEqual toGreater thanNot equal toHintThe density of electrons in an intrinsic semiconductor is equal to the density of holes 10). The electrical conductivity in an intrinsic semiconductor is _______________HighVery highLowMediumHintThe electrical conductivity in an intrinsic semiconductor is low 11). The ratio of minority and majority carriers in an extrinsic semiconductor is ____________UnityNot unityOneInfinityHintThe ratio of minority and majority carriers in an extrinsic semiconductor is not unity 12). Which one of the following has a low operating temperature?IntrinsicExtrinsicBoth a and bNone of the aboveHintAn intrinsic semiconductor has a low operating temperature 13). The acceptor impurities are used in ___________ type semiconductorN-typeP-typeBoth a and bNone of the aboveHintThe acceptor impurities are used in N-type semiconductor 14). _______________ are the examples of compound semiconductorGaPCdsGaAsAll of the aboveHintThe GaP, Cds, and GaAs are examples of compound semiconductor 15). _______________ are the pentavalent impuritiesArsenic, antimonyPhosphorousBismuthAll of the aboveHintThe arsenic, antimony, phosphorous are the pentavalent impurities 16). ______________ are the trivalent impuritiesAluminium, boronGalliumIndiumAll of the aboveHintThe aluminum, boron, gallium, and indium are the trivalent impurities 17). How many valence electrons do trivalent impurities have?OneTwoThreeFourHintThe trivalent impurities have three valence electrons 18). The threshold voltage/barrier potential of germanium diode is _______________1 volts0.3 volts10 volts100 voltsHintThe threshold voltage/barrier potential of germanium diode is 0.3 volts 19). The Zener diode is used for ______________RectificationVoltage regulationBoth a and bNone of the aboveHintThe Zener diode is used for voltage regulation Read more about Zener Diode 20). Which one of the following is a majority current carrier in P-type semiconductors?Free electronsHolesBoth a and bNone of the aboveHintThe holes are the majority current carrier in P-type semiconductors 21).The density of electrons in an extrinsic semiconductor is _______________ the density of holesEqual toNot equal toGreater thanLess thanHintThe density of electrons in an extrinsic semiconductor is not equal to the density of holes 22). The electrical conductivity in an extrinsic semiconductor is _______________HighVery lowLowBetterHintThe electrical conductivity in an extrinsic semiconductor is high 23). The ratio of minority carriers in an intrinsic semiconductor is _______________OneTwoUnityNot unityHintThe ratio of minority carriers in an intrinsic semiconductor is unity 24). The donor impurities are used in ______________ type semiconductorP-typeN-typeBoth a and bNone of the aboveHintThe donor impurities are used in P-type semiconductor 25). The current in ______________ region is infiniteConductionNon-conductionBoth a and bNone of the aboveHintThe current in the conduction region is infiniteSemiconductor Diode Important MCQs 26). The doped semiconductor materials are categorized into __________OneTwoThreeFourHintThe doped semiconductor materials are categorized into two types they are N-type and P-type 27). ____________ are the diode operating conditionsNo biasForward biasReverse biasAll of the aboveHintThe no bias, forward bias, and reverse bias are the diode operating conditions 28). How many types of resistance are there?OneTwoThreeFourHintThere are three types of resistances are there they are DC, AC, and average AC resistance 29). Which band contains valence electrons?Valance bandConduction bandForbiddenNone of the aboveHintThe valence band contains valence electrons 30). Which band contains free electrons?Valance bandConduction bandForbiddenNone of the aboveHintThe conduction band contains free electrons 31). Which one of the following separates conduction and valence band?Forbidden energy bandConductorsInsulatorsAll of the aboveHintThe forbidden energy band separates conduction and valence band 32). In ____________ band no electrons existForbidden energy bandConductorsInsulatorsAll of the aboveHintIn a forbidden band, no electrons exist 33).The forbidden gap measured in terms of _______________AmperesOhmsElectron voltsNone of the aboveHintThe forbidden gap measured in terms of electron volts 34). Based on the width of the forbidden gap the materials are categorized into __________ typesOneTwoThreeFourHintBased on the width of the forbidden gap the materials are categorized into three types they are insulators, semiconductors, and conductors 35). _____________ are the examples of conductorMetalsSaltwaterBoth a and bNone of the aboveHintThe metals, saltwater, etc are examples of conductor 36). _____________ are the examples of insulatorWood, paperSaltwater, metalsGe, si, GaAsNone of the aboveHintThe wood, paper, etc are examples of insulator 37). Which one of the following materials doesn’t conduct any current?ConductorInsulatorSemiconductorAll of the aboveHintThe insulator doesn’t conduct any current 38). How many valance electrons do insulators have in their outermost orbit?TwoFourEightSixteenHintThe insulators have eight valance electrons in their outermost orbit 39). ___________ are formed due to ionic bondingInsulatorsConductorsSemiconductorsAll of the aboveHintAn insulators are formed due to ionic bonding 40). In ___________ region the diode acts like openConductionNon-conductionBoth a and bNone of the aboveHintIn non-conduction region the diode acts like open 41). The resistance is very high in ______________InsulatorsConductorsSemiconductorsAll of the aboveHintThe resistance is very high in insulators 42). Which one of the following materials has a negative temperature coefficient?InsulatorsConductorsSemiconductorsBoth b and cHintThe conductors and semiconductor materials have a negative temperature coefficient 43). How many valence electrons do conductors have?OneTwoThreeFourHintThe conductors have only one valence electron in their outermost orbit 44). In which one of the following materials the resistance is very small?InsulatorsConductorsSemiconductorsNone of the aboveHintIn conductors the resistance is very small 45). The energy gap in semiconductors is from ________1 ev to 10 ev0.7 ev to 2 ev1 ev to 20 ev1 ev to 100 evHintThe energy gap in semiconductors is from 0.7 EV to 2 EV 46). The energy gap in conductors is from ________0.01 ev0.7 ev to 2 ev1 ev to 20 ev1 ev to 100 evHintThe energy gap in conductors is from 0.01 ev 47). _____________ are formed by covalent bondingInsulatorsConductorsSemiconductorsNone of the aboveHintThe semiconductors are formed by covalent bonding 48). _____________ are formed by metallic bondingInsulatorsConductorsSemiconductorsNone of the aboveHintThe conductors are formed by metallic bonding 49). The number of carriers at normal temperature is low in ____________InsulatorsConductorsSemiconductorsNone of the aboveHintThe number of carriers at normal temperature is low in semiconductor 50). What is the standard form of TVS diode?Transient Voltage SuppressionTransparent Voltage SuppressionTransistor Voltage SuppressionNone of the aboveHintThe standard form of TVS diode is Transient Voltage Suppression Semiconductor Diode MCQs with Hints 51). How many valence electrons do semiconductors have?OneTwoThreeFourHintThe semiconductors have four valence electrons in their outermost orbit 52). The energy gap in insulators is from ________1 ev to 10 ev0.7 ev to 2 ev5 ev1 ev to 100 evHintThe energy gap in insulators is 5 ev 53). ______________ breakdown temperature coefficient is positiveAvalancheZenerBoth a and bNone of the aboveHintIn avalanche diode the breakdown temperature coefficient is positive 54). The doping levels in conventional diode are _____________Very highHighVery lowModerateHintThe doping levels in conventional diode are moderate 55). The cut-in voltage in conventional diode is ____________ for silicon0.6 to 0.7 volts1 to 2 volts10 to 20 volts1 to 25 voltsHintThe cut-in voltage in conventional diode is 0.6 to 0.7 volts for silicon 56). The cut-in voltage in tunnel diode is ____________0.1 volts1 to 2 volts10 to 20 volts1 to 25 voltsHintThe cut-in voltage in tunnel diode is 0.1 volts 57). Which one of the following diodes is introduced by Esaki?Varactor diodePN diodeLaser diodeTunnel diodeHintThe tunnel diode is introduced by Esaki 58). The frequency range of the PN-junction diode is _________Up to 1MHzUp to 2MHzUp to 5MHzUp to 10MHzHintThe frequency range of the PN-junction diode is up to 10MHz 59). The frequency range of the Schottky diode is _________Up to 1MHzUp to 25MHzUp to 100MHzUp to 300MHzHintThe frequency range of the Schottky diode is more than 300MHz 60). The doping levels in tunnel diode are _____________Very highHighVery lowModerateHintThe doping levels in tunnel diode are very high 61). Which one of the following breakdowns occurs in heavily doped diodes?ZenerAvalancheBoth a and bNone of the aboveHintThe Zener breakdown occurs in heavily doped diodes 62). ___________ breakdown occurs at the low reverse bias voltagesZenerAvalancheBoth a and bNone of the aboveHintThe Zener breakdown occurs at the low reverse bias voltages 63). The light-emitting diodes has _______________Low efficiencySlow response timeLower data transmission rateAll of the aboveHintThe light-emitting diodes has low efficiency, slow response time, and lower data transmission rate 64). The laser diodes has _______________High efficiencyFast response timeHigher data transmission ratAll of the aboveHintThe laser diodes have high efficiency, fast response time, and higher data transmission rate 65). Which one of the following provides less distortion?LEDLaser diodeBoth a and bNone of the aboveHintThe laser diodes provide less distortion compares to LED 66). Which one of the following diodes works on the electro luminance principle?LEDPhoto-diodeBoth a and bNone of the aboveHintThe light-emitting diode works on the electro luminance principle 67). Which one of the following diodes converts light energy into electrical energy?LEDPhoto-diodeBoth a and bNone of the aboveHintThe photo-diode converts light energy into electrical energy 68). The biasing mode of LED is ____________Only forwardOnly reverseEither forward or revereNone of the aboveHintThe biasing mode of LED is forward only 69). How many PN junctions do crystal diodes have?OneTwoThreeFourHintThe crystal diodes have only one PN junction 70). Which one of the following breakdowns occurs in lightly doped diodes?ZenerAvalancheBoth a and bNone of the aboveHintThe avalanche breakdown occurs in lightly doped diodes 71). ___________ breakdown occurs at the high reverse bias voltagesZenerAvalancheBoth a and bNone of the aboveHintThe avalanche breakdown occurs at the high reverse bias voltages 72). Which one of the following diodes works on the photoconduction principle?LEDPhotodiodeBoth a and bNone of the aboveHintThe photodiode works on the photoconduction principle 73). What are the applications of a photodiode?Used in consumer electronic devicesUsed in medical and scientific instrumentsOptical communicationAll of the aboveHintThe photodiodes are used in consumer electronic devices, medical and scientific instruments, optical communication, etc. 74). ______________ diode is also known as surface barrier diodeSchottky diodeZenerAvalancheNone of the aboveHintThe Schottky diode is also known as surface barrier diode 75). Which one of the following diodes is also known as a transferred electron device?Schottky diodeZenerAvalancheGunnHintThe Gunn diode is also known as transferred electron deviceSemiconductor Diode MCQs for Exams 76). Which one of the following diodes is discovered by John Battiscombe Gunn?Schottky diodeZenerAvalancheGunnHintThe Gunn diode is discovered by John Battiscombe Gunn 77). In how many modes does the PN junction works?OneTwoThreeFourHintIn two modes PN junction works they are forward bias and reverse bias mode 78). What are the advantages of the PN junction diode?Occupies lesser spaceNo filament is necessaryLong lifeAll of the aboveHintThe advantages of the PN junction diode are it occupies less space, no filament is necessary, and it has a long life 79). What are the applications of the PN junction diode?RectifiersSwitchDetectorsAll of the aboveHintThe PN junction diode used as rectifiers, switch, and detectors, etc 80). The polyethylene is an example for ______________InsulatorConductorSemiconductorNone of the aboveHintThe polyethylene is an example of an insulator 81). Which one of the following diodes is discovered by Melvin Zener?Schottky diodeZenerAvalancheGunnHintThe Zener diode is discovered by Melvin Zener 82). The copper or aluminum is an example for ______________InsulatorConductorSemiconductorNone of the aboveHintThe copper or aluminum is an example of the conductor 83). Which one of the following diodes produces voltage-dependent capacitor?VaractorTunnelZenerAll of the aboveHintThe varactor diodes produces voltage-dependent capacitor 84). Which one of the following diodes is used for mixing and detection of microwave signals?CrystalSchottkyBoth a and bNone of the aboveHintThe crystal and Schottky diodes both are used for mixing and detection of microwave signals 85). The PIN diodes are used for _____________SwitchingModulationAttenuationAll of the aboveHintThe PIN diodes are used for switching, modulation, and also used for attenuation 86). The varactor diodes are used for _____________AmplificationFrequency multiplicationTuningAll of the aboveHintThe varactor diodes are used for amplification, frequency multiplication, and tuning 87). Which one of the following diodes is used for oscillation?TunnelGunnBoth a and bNone of the aboveHintThe Gunn and tunnel diodes both are used for oscillation 88). The peak inverse voltage of silicon diode is ______________10 volts50 volts100 volts1000 voltsHintThe peak inverse voltage of silicon diode is 1000 volts 89). The threshold voltage/barrier potential of silicon diode is _______________1 volts0.6 volts10 volts100 voltsHintThe threshold voltage/barrier potential of silicon diode is 0.6 volts 90). The PIV of germanium diode is _______________ volts1000 volts2000 volts3000 volts4000 voltsHintThe PIV of germanium diode is 4000 volts 91). The forward voltage drop of germanium diode is ______________0.1 volts0.0001 volts0.3 volts10 voltsHintThe forward voltage drop of germanium diode is 0.3 volts 92). How many types of photodiodes are there?OneTwoThreeFourHintThe photodiodes are of two types they are PN and PIN photodiodes 93). In how many modes does photodiode works?OneTwoThreeFourHintThe photodiodes works in two modes they are photoconductive mode, and photovoltaic mode 94). How many terminals does the silicon PIN diode consist of?OneTwoThreeFourHintThe silicon PIN diode consists of two terminals 95). The breakdown voltage of silicon PIN diode is ___________10 V20 V30 V50 VHintThe breakdown voltage of silicon PIN diode is 50 V 96). The lower frequency limit of silicon PIN diode is ___________1 MHz2 MHz5 MHz10 MHzHintThe lower frequency limit of the silicon PIN diode is 10 MHz 97). The driver circuit complexity is _____________ in silicon PIN diodeVery lowLowHighModerateHintThe driver circuit complexity is high in silicon PIN diode 98). The electrical resistivity of silicon is _____________1 ohm meter2 ohm meter3 ohm meter5 ohm meterHintThe electrical resistivity of silicon is 1 ohm meter 99). The electrical resistivity of germanium is _____________10 ohm meter2 ohm meter3 ohm meter5 ohm meterHintThe electrical resistivity of germanium is 10 ohm meter 100). The energy gap at zero degree kelvin in silicon is _____________3.8ev1.21ev6.7ev4.5evHintThe energy gap at zero degrees kelvin in silicon is 1.21 ev Time is Up! Time's up
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