Semiconductor Theory Question & AnswersSeptember 13, 2021 By Wat Electrical Leave a Comment This article lists 100 Semiconductor Theory MCQs for Engineering Students. All the Semiconductor Theory Questions & Answers given below includes solution and link wherever possible to the relevant topic.A semiconductor substance in electrical is made up of both conducting and insulating properties. In other terms, it is a substance that acts as a partial conductor and an insulator. Semiconductor technology has overcome and replaced the drawback of vacuum tubes. They are of 2types of substances used in this technology p-type and n-type. Where a p-type semiconductor is a positive polarity containing the majority of holes as charge carriers and n-type is negative polarity containing the majority of electrons as charge carriers.Scientist Karl Ferdinand Braun in the year 184 has developed the first semi-conducting detector called crystal. Germanium, silicon, crystal, diamond, and more are a few examples of semiconductors. The voltage and current rating of these substances range between 100000volts and 5000 amps. These substances are built into other electronic components such as diodes, switches, and more such as a p-n diode, Zener diode, pin diode, etc. The advantage of using a semiconductor device is low cost, high performance, high efficiency. The main applications of semiconductor substances include fans, motors, switches, mobile phones, regulators, etc. 1). Which of the following is current range of semiconducting material?4000 Amps5000 Amps1000 Amps3000 AmpsHintThe current range of semiconducting material ranges above 4000 Amps. 2). Which of the following is voltage range of semiconducting material?100,0001000010010HintThe voltage range of semiconducting material is above 100000. 3). What happens to resistivity of semiconductor material when temperature increases?IncreasesDecreasesZeroConstantHintThe value of resistivity of semiconductor material decreases when temperature increases. 4). Which of the following is a semiconducting material?CopperIronWoodSiliconHintSilicon is a semiconducting material. 5). Which of the following are the charge carriers of semiconducting materials?ElectronsHolesNeutronsBoth a and bHintElectrons and holes are the charge carriers of semiconducting materials. 6). Which of the following are applications of semiconducting device?ICSolar cellsLaser diodesAll the aboveHintThe applications of semiconducting devices are IC, solar cells, laser diodes, and more. Read more about Solar Cell 7). Which of the following semiconducting material is most commonly used?SiliconCrystalGermaniumGalliumHintSilicon semiconducting material is most commonly used. 8). How much quantity of pentavalent element is added to increase the conductivity value of Silcon material?10 ^810^310^210^9Hint10^8 quantity of pentavalent element is added to increase the conductivity value of Silicon material. 9). Which of the following is a pentavalent substance?PhosphorousGalliumIndiumBoronHintPhosphorous, antimony, and arsenic are pentavalent substances. 10). Which of the following is a trivalent substance?GalliumArsenicAntimonyPhosphorousHintGallium, boron, and indium are trivalent substances. 11). A p-type semiconductors has ___ as majority charge carriers?HolesElectronsNeutronsAll the aboveHintA p-type semiconductor has holes as the majority charge carriers. 12). A n-type semiconductors has ___ as majority charge carriers?HolesElectronsNeutronsAll the aboveHintAn n-type semiconductor has electrons as the majority charge carriers. 13). The process of adding either holes or electrons to a semiconducting substance is called_____ExtractionDopingExtrinsic semiconductorsBoth b and cHintThe process of adding either holes or electrons to a semiconducting substance is called doping and extrinsic semiconducting substance. 14). The properties of semiconductors depends on ____Chemical propertyMathematical representationQuantum physicsAll the aboveHintThe properties of semiconductors depend on quantum physics that explains the movement of charge carriers. 15). On performing doping process in a semiconducting device, what happens to crystals charge carriers?IncreasesDecreasesZeroConstantHintOn performing doping process in a semiconducting device, crystals charge carriers increases. 16). How many type of dopants does a semiconductor device has?2341HintA semiconductor device has 2 dopants namely p-type and n-type. 17). Which of the following in p-n diode, is reason for electronic behavior?P-typeN-typeP-N junctionAll the aboveHintIn the p-n diode, the P_N junction region is the reason for electronic behavior. 18). Who developed semiconductor device?JamesHenryDenis RichardKarl BraunHintKarl Braun in the year 1874 has developed a semiconducting device called crystal. 19). Which of the following is the first semiconducting device discovered?CrystalSiliconGermaniumCopperHintCrystal is the first semiconducting device discovered. 20). MOSFET stands for___Metal oxide semiconductor field effect transistorMetal oxide semiconductor field effect transformerMetal oxide semi container field effect transistorMetal oxide semiconductor flow effect transistorHintMOSFET stands for Metal oxide semiconductor field effect transistor Read more about MOSFET 21). How many semiconducting theory property are present?2346HintThere are 6 semiconducting theory properties namely, variable electrical conductivity, heterojunction, excited electrons, light emission, high thermal conductivity, and thermal energy conversion. 22). Which of the following is an semi-insulator?Gallium arsenideHydrogenCarbonAll the aboveHintGallium Arsenide is a semi-insulator.Semiconductor Theory Questions and Answers 23). With which type of bond a semiconductor substance is formed?CoordinateCovalentElectrovalentAll the aboveHintA covalent type bond is used to develop a semiconductor substance. 24). The temperature coefficient of a resistance for a semiconductor is _______NegativePositiveZeroInfinityHintThe temperature coefficient of resistance for a semiconductor is a negative value. 25). How much valence of electrons do semiconductors have?2345HintSemiconductors have 4 valences of electrons. 26). Which of the following is the resistivity value of silicon semiconductor at standard based condition?5000 ohms6000 ohms3000 ohms4000 ohmsHintThe resistivity value of silicon semiconductors at standard-based conditions is 6000 ohms. 27). On which of the following factor does strength of crystal used as semiconductor is used?Electron-Electron bondProton-proton forceNuclei-Nuclei forceBoth a and bHintOn electron-electron bond strength of crystal used as a semiconductor is used. 28). A semiconducting substance added with pentavalent type impurity produces ____ type of substance?InsulatorConductorP-typeN-typeHintA semiconducting substance added with pentavalent type impurity produces N-type of substance. 29). A semiconducting substance added with pentavalent type impurity generates which of the following majority carriers?HolesElectronsProtonsBoth a and bHintA semiconducting substance added with pentavalent type impurity generates a majority of electrons as carriers. 30). A semiconducting substance added with pentavalent type impurity has ___ value of electron valence?2345HintA semiconducting substance added with pentavalent type impurity has 5 value of electron valence. 31). A semiconducting substance added with trivalent type impurity has ___ value of electron valence?2345HintA semiconducting substance added with trivalent type impurity has 3 electron valence. 32). A semiconducting substance added with trivalent type impurity produces ____ type of substance?InsulatorConductorP-typeN-typeHintA semiconducting substance added with trivalent type impurity produces P-type of substance. 33). Which of the following is the impurity range of an extrinsic type semiconductor?10 - 108 atoms1-108atoms100-108atoms110-200atomsHintThe impurity range of an extrinsic type semiconductor is 1-108atoms. 34). What happens to semiconductor resistance when doping quantity increases?IncreasesDecreasesZeroInfinityHintThe semiconductor resistance value decreases when doping quantity increases. 35). When hole and electron carriers are placed together then their behavior ___AttractRepelBombardBoth a and cHintWhen hole and electron are placed together then their behavior attracts. 36). When hole and hole carriers are placed together then their behavior ___AttractRepelBombardBoth a and cHintWhen hole and hole carriers are placed together then their behavior attracts or is bombard. 37). When electron and electron carriers are placed together then their behavior ___AttractRepelBombardBoth a and cHintWhen electron and electron carriers are placed together then their behavior attracts or is bombard. 38). Which of the following is responsible for semiconductors conduction?ElectronsHolesNeutronsBoth a and bHintBoth electrons and holes are the carriers responsible for semiconductor's conduction. 39). Which of the following process is defined as, the moment of charge carriers due to increase in temperature supplied.PressureDiffusionIonizationBoth a and bHintDiffusion is defined as, the moment of charge carriers due to an increase in temperature supplied. 40). What is resistance order of a forward biased p-n junction diode?OhmsKilo ohmsMegaohmsAll the aboveHintThe resistance order of a forward biased p-n junction diode is ohms.Semiconductor Theory Important MCQ's with Hints 41). What is resistance order of a reverse biased p-n junction diode?OhmsKilo ohmsMegaohmsAll the aboveHintThe resistance order of a reverse biased p-n junction diode is Mega-ohms. 42). In pn junction diode, the positive terminal in forward bias is connected to ____ polarity of battery?PositiveNegativeZeroBoth a and bHintIn PN junction diode, the positive terminal in forward bias is connected to the positive polarity of the battery. 43). In PN junction diode, the negative terminal in forward bias is connected to ____ polarity of battery?PositiveNegativeZeroBoth a and bHintIn PN junction diode, the negative terminal in forward bias is connected to the negative polarity of the battery. 44). In pn junction diode, the negative terminal in reverse bias is connected to ____ polarity of battery?PositiveNegativeZeroBoth a and bHintIn PN junction diode, the negative terminal in forward bias is connected to the positive polarity of the battery. 45). In PN junction diode, the negative terminal in reverse bias is connected to ____ polarity of battery?PositiveNegativeZeroBoth a and bHintIn the PN junction diode, the negative terminal in reverse bias is connected to the positive polarity of the battery. 46). In pn junction diode, the positive terminal in reverse bias is connected to ____ polarity of battery?PositiveNegativeZeroBoth a and bHintIn PN junction diode, the positive terminal in reverse bias is connected to the negative polarity of the battery. 47). What is the voltage value of germanium in a PN junction diode?2V5V0V3VHintThe voltage value of germanium in a pn junction diode is 3V. 48). Which of the following carriers are stored in depletion region of PN junction diode?Electrons aloneHoles aloneBoth electrons and holesNeutronsHintBoth electrons and holes carriers are stored in the depletion region of the PN junction diode. 49). How much current value do a PN based junction in reverse type bias has?0A5A3AInfinityHintThe current value of a PN based junction in reverse type bias is 0V. 50). Which of the following is the function of PN junction?Acts as a single direction switchActs as a bi-direction type switchActs as a batteryAll the aboveHintThe function of PN junction is acts as a single direction switch. 51). A PN junction diode has ___ number of terminals?2341HintA PN junction diode has 2 terminals like positive and negative. 52). Anode terminal of PN junction diode is represented with______ symbol+-*Either a orHintAnode terminal of pn junction diode is represented with “+”. 53). Cathode terminal of pn junction diode is represented with______ symbol53. Cathode terminal of pn junction diode is represented with______ symbol+-*Either a or bHintA cathode terminal of pn junction diode is represented with “-”. 54). The method of sending voltage from external source to p-n junction diode to operate is called_______DopingBiasingSourcingNone of the aboveHintThe method of sending voltage from external source to p-n junction diode to operate is called biasing. 55). The width of PN junction in forward bias is ____ThinThickMediumZeroHintThe width of pn junction in forward bias is thin. 56). The width of pn junction in reverse bias is ____ThinThickMediumZeroHintThe width of the pn junction in reverse bias is thick. 57). The barrier formed in pn junction diode on voltage supplied is called______Depletion regionBreakdown regionBlockage regionAll the aboveHintThe barrier formed in pn junction diode on the voltage supplied is called the depletion region. 58). Which of the following is the forward bias voltage value of silicon semiconductor?0.70.30.50.4HintThe forward bias voltage value of silicon semiconductor is 0.7V. 59). Which of the following is the forward bias voltage value of germanium semiconductor?0.70.30.50.4HintThe forward bias voltage value of the germanium semiconductor is 0.3V. 60). If voltage of silicon diode is less than 0.7v, what will be its output voltage?0.7V0.6V0V0.1VHintIf the voltage of the silicon diode is less than 0.7v, then its output voltage is 0V. 61). If voltage of germanium diode is less than 0.3v, what will be its output voltage?0.7V0.6V0V0.1VHintIf the voltage of the germanium diode is less than 0.3v, then its output voltage is 0V. 62). Which of the following are the advantages of a semiconducting devices?Converts AC to DCAllows current in single directionBlocks current flow in opposite directionAll the aboveHintThe advantages of a semiconducting device are converts AC to DC, allows current in a single direction and blocks current flow in opposite direction. 63). Which of the following are different types of semiconducting diodes?Zener diodeLEDTunnel diodeAll the aboveHintDifferent types of semiconducting diodes include Zener diode, LED, tunnel diode, Avalanche diode, PN diode, etc. Read more about LED. 64). A Zener diode in forward bias has ___ value of resistance?LargeSmallZeroInfinityHintA Zener diode in forward bias has a small value of resistance. 65). A Zener diode has ___ quantity of doping value compared to pn junction diodeHighLowMediumZeroHintA Zener diode has a high quantity of doping value compared to a PN junction diode. Read more about Zener Diode. 66). The depletion region in Zener diode is of ____ sizeThinThickMediumZeroHintThe depletion region in the Zener diode is of thin size. 67). The flow of current in Zener diode is in ___ directionUniBiSingleMuktiHintThe flow of current in the Zener diode is in the bi- direction both forward and reverse. 68). Who discovered Zener diode?Charles ZenerMelvin ZenerJamesRichardHintMelvin Zener discovered Zener's diode. 69). How many types of breakdown do Zener diode have?1234HintZener diode has 2 breakdowns namely Avalanche break down and Zener breakdown. Read more about Breakdown VoltageSemiconductor Theory MCQ's for Interviews 70). How many breakdowns do pn junction diode have?1234HintA PN junction diode has 1 breakdown namely Avalanche breakdown. 71). What is the voltage value for avalanche breakdown in Zener diode?5V6V3V7VHintThe voltage value for avalanche breakdown in the Zener diode is 7V. 72). On supply of which voltage does avalanche breakdown occurs in Zener diode?ForwardReversePositiveBoth a and cHintOn supply of reverse voltage avalanche breakdown occurs in Zener diode. 73). In which bias does Zener breakdown occurs in Zener diode?ForwardReverseZeroAll the aboveHintIn reverse bias, Zener breakdown occurs in the Zener diode. 74). What is the reverse voltage value when a Zener breakdown occurs in a Zener diode?74. What is the reverse voltage value when a Zener breakdown occurs in a Zener diode?LowHighZeroConstantHintWhen the reverse voltage value of the Zener diode is low when a Zener breakdown occurs in a Zener diode. 75). Breakdown region is Zener diode is also called_____Operating regionNon operating regionOpen circuited regionBoth b and cHintThe Breakdown region is the Zener diode is also called an operating region. 76). A Zener diode has __ number of terminals?2314HintA Zener diode is a 2 number terminal component namely anode and cathode. 77). The value of current leakage of a Zener diode in reverse bias is ____SmallLargeMediumZeroHintThe value of current leakage of a Zener diode in reverse bias is small. 78). Which of the following are the advantages of Zener diode?Minimum costAccurateCapacity of power dissipation is largeAll the aboveHintThe advantages of the Zener diode are minimum cost, accuracy, and capacity of power dissipation is large. 79). Which of the following are the applications of Zener diode?Voltage regulatorSwitchClipper and clamperAll the aboveHintThe applications of Zener diode includes voltage regulator, switch, clipper, and clamper in many electronic circuits. 80). An avalanche diode operates in __regionForward biasReverse biasForward breakdownReverse breakdownHintAn avalanche diode operates in a reverse breakdown region. 81). The width of depletion region of avalanche diode is ______ThinThickZeroAll the aboveHintThe width of the depletion region of the avalanche diode is thick. 82). Which of the following are the applications of avalanche diode?White noiseSwitchesClampersAll the aboveHintA photodiode is also called a PN diode or a pin diode or a light diode. 84). Which of the following is the source of photo diode?LightAirGasWaterHintThe source of photo diode is light. 85). Photo diode operates in ___direction?UniBiTwoMultiHintPhotodiode operates in a single negative direction. 86). Photo diode operates in ___ bias?ForwardReverseEither forward or reverseAll the aboveHintPhoto diode operates in reverse bias. 87). PIN diode is used in ___ type of applications?High speedLow speedMedium speedAll the aboveHintPIN diode is used in high speed type of applications 88). Which of the following is the additional representation of photo diode compared to pn diode?+terminal-terminalArrow strikingInward lineHintThe additional representation of photo diode compared to pn diode is arrow striking. 89). Which of the following are the characteristics of pin diode?High gainMinimum costLong lifespanAll the aboveHintThe characteristics of pin diode is high gain, minimum cost and long life span. 90). Photo diodes are classified into __ number of types?2314HintPhotodiodes are classified into 3 types namely, pin, pin, and avalanche photodiode. 91). Which of the following characteristic varies for pin diode compared to pn junction diode?OperationConstructionAdvantagesManufacturingHintManufacturing characteristic of pin diode varies compared to pn junction diode. 92). A pin diode has __ number of layers?2345Hintpin diode has 3 layers like p, n, and an additional intrinsic layer. 93). The width of pin diode is _____ThinThickMediumZeroHintThe width of pin diode is thick. 94). In which bias condition does pin diode act as resistor?ForwardReverseBoth a and bNone of the aboveHintIn forward bias condition pin diode act as a resistor. 95). What is the value of capacitance of a pin junction diode?HighLowMediumZeroHintThe value of capacitance of a pin junction diode is low. 96). Which of the following are the advantages of pin diode?Bandwidth is wideEfficiency of quantum is highSpeed of response is highAll the aboveHintThe advantages of pin diode are bandwidth is wide, the efficiency of quantum is high and speed of response is high. 97). Which of the following are the applications of photo diode?Smoke detectorsDisc playersOptical devicesAll the aboveHintThe applications of photo diode include smoke detectors, disc players and optical devices. 98). A laser diode is also called as ____Injection lasersJunction lasersSemiconductor lasersAll the aboveHintA laser diode is also called an injection laser, junction laser, and semiconductor laser. 99). The width of laser diode in forward bias is ______ThinThickWideZeroHintThe width of a laser diode in forward bias is thin. 100). Which of the following are the applications of laser diode?Laser type pointersFiber opticsBarcode readerAll the aboveHintThe applications of laser diode include laser type pointer, fiber optics, and barcode readers. Time is Up! Time's up
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