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 Amps 5000 Amps 1000 Amps 3000 Amps None Hint2). Which of the following is voltage range of semiconducting material? 100,000 10000 100 10 None Hint3). What happens to resistivity of semiconductor material when temperature increases? Increases Decreases Zero Constant None Hint4). Which of the following is a semiconducting material? Copper Iron Wood Silicon None Hint5). Which of the following are the charge carriers of semiconducting materials? Electrons Holes Neutrons Both a and b None Hint6). Which of the following are applications of semiconducting device? IC Solar cells Laser diodes All the above None HintRead more about Solar Cell None 7). Which of the following semiconducting material is most commonly used? Silicon Crystal Germanium Gallium None Hint8). How much quantity of pentavalent element is added to increase the conductivity value of Silcon material? 10 ^8 10^3 10^2 10^9 None Hint9). Which of the following is a pentavalent substance? Phosphorous Gallium Indium Boron None Hint10). Which of the following is a trivalent substance? Gallium Arsenic Antimony Phosphorous None Hint11). A p-type semiconductors has ___ as majority charge carriers? Holes Electrons Neutrons All the above None Hint12). A n-type semiconductors has ___ as majority charge carriers? Holes Electrons Neutrons All the above None Hint13). The process of adding either holes or electrons to a semiconducting substance is called_____ Extraction Doping Extrinsic semiconductors Both b and c None Hint14). The properties of semiconductors depends on ____ Chemical property Mathematical representation Quantum physics All the above None Hint15). On performing doping process in a semiconducting device, what happens to crystals charge carriers? Increases Decreases Zero Constant None Hint16). How many type of dopants does a semiconductor device has? 2 3 4 1 None Hint17). Which of the following in p-n diode, is reason for electronic behavior? P-type N-type P-N junction All the above None Hint18). Who developed semiconductor device? James Henry Denis Richard Karl Braun None Hint19). Which of the following is the first semiconducting device discovered? Crystal Silicon Germanium Copper None Hint20). MOSFET stands for___ Metal oxide semiconductor field effect transistor Metal oxide semiconductor field effect transformer Metal oxide semi container field effect transistor Metal oxide semiconductor flow effect transistor None HintRead more about MOSFET21). How many semiconducting theory property are present? 2 3 4 6 None Hint22). Which of the following is an semi-insulator? Gallium arsenide Hydrogen Carbon All the above None HintSemiconductor Theory Questions and Answers23). With which type of bond a semiconductor substance is formed? Coordinate Covalent Electrovalent All the above None Hint24). The temperature coefficient of a resistance for a semiconductor is _______ Negative Positive Zero Infinity None Hint25). How much valence of electrons do semiconductors have? 2 3 4 5 None Hint26). Which of the following is the resistivity value of silicon semiconductor at standard based condition? 5000 ohms 6000 ohms 3000 ohms 4000 ohms None Hint27). On which of the following factor does strength of crystal used as semiconductor is used? Electron-Electron bond Proton-proton force Nuclei-Nuclei force Both a and b None Hint28). A semiconducting substance added with pentavalent type impurity produces ____ type of substance? Insulator Conductor P-type N-type None Hint29). A semiconducting substance added with pentavalent type impurity generates which of the following majority carriers? Holes Electrons Protons Both a and b None Hint30). A semiconducting substance added with pentavalent type impurity has ___ value of electron valence? 2 3 4 5 None Hint31). A semiconducting substance added with trivalent type impurity has ___ value of electron valence? 2 3 4 5 None Hint32). A semiconducting substance added with trivalent type impurity produces ____ type of substance? Insulator Conductor P-type N-type None Hint33). Which of the following is the impurity range of an extrinsic type semiconductor? 10 - 108 atoms 1-108atoms 100-108atoms 110-200atoms None Hint34). What happens to semiconductor resistance when doping quantity increases? Increases Decreases Zero Infinity None Hint35). When hole and electron carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c None Hint36). When hole and hole carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c None Hint37). When electron and electron carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c None Hint38). Which of the following is responsible for semiconductors conduction? Electrons Holes Neutrons Both a and b None Hint39). Which of the following process is defined as, the moment of charge carriers due to increase in temperature supplied. Pressure Diffusion Ionization Both a and b None Hint40). What is resistance order of a forward biased p-n junction diode? Ohms Kilo ohms Megaohms All the above None HintSemiconductor Theory Important MCQ's with Hints41). What is resistance order of a reverse biased p-n junction diode? Ohms Kilo ohms Megaohms All the above None Hint42). In pn junction diode, the positive terminal in forward bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b None Hint43). In PN junction diode, the negative terminal in forward bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b None Hint44). In pn junction diode, the negative terminal in reverse bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b None Hint45). In PN junction diode, the negative terminal in reverse bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b None Hint46). In pn junction diode, the positive terminal in reverse bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b None Hint47). What is the voltage value of germanium in a PN junction diode? 2V 5V 0V 3V None Hint48). Which of the following carriers are stored in depletion region of PN junction diode? Electrons alone Holes alone Both electrons and holes Neutrons None Hint49). How much current value do a PN based junction in reverse type bias has? 0A 5A 3A Infinity None Hint50). Which of the following is the function of PN junction? Acts as a single direction switch Acts as a bi-direction type switch Acts as a battery All the above None Hint51). A PN junction diode has ___ number of terminals? 2 3 4 1 None Hint52). Anode terminal of PN junction diode is represented with______ symbol + - * Either a or None Hint53). Cathode terminal of pn junction diode is represented with______ symbol53. Cathode terminal of pn junction diode is represented with______ symbol + - * Either a or b None Hint54). The method of sending voltage from external source to p-n junction diode to operate is called_______ Doping Biasing Sourcing None of the above None Hint55). The width of PN junction in forward bias is ____ Thin Thick Medium Zero None Hint56). The width of pn junction in reverse bias is ____ Thin Thick Medium Zero None Hint57). The barrier formed in pn junction diode on voltage supplied is called______ Depletion region Breakdown region Blockage region All the above None Hint58). Which of the following is the forward bias voltage value of silicon semiconductor? 0.7 0.3 0.5 0.4 None Hint59). Which of the following is the forward bias voltage value of germanium semiconductor? 0.7 0.3 0.5 0.4 None Hint60). If voltage of silicon diode is less than 0.7v, what will be its output voltage? 0.7V 0.6V 0V 0.1V None Hint61). If voltage of germanium diode is less than 0.3v, what will be its output voltage? 0.7V 0.6V 0V 0.1V None Hint62). Which of the following are the advantages of a semiconducting devices? Converts AC to DC Allows current in single direction Blocks current flow in opposite direction All the above None Hint63). Which of the following are different types of semiconducting diodes? Zener diode LED Tunnel diode All the above None HintRead more about LED.64). A Zener diode in forward bias has ___ value of resistance? Large Small Zero Infinity None Hint65). A Zener diode has ___ quantity of doping value compared to pn junction diode High Low Medium Zero None HintRead more about Zener Diode.66). The depletion region in Zener diode is of ____ size Thin Thick Medium Zero None Hint67). The flow of current in Zener diode is in ___ direction Uni Bi Single Mukti None Hint68). Who discovered Zener diode? Charles Zener Melvin Zener James Richard None Hint69). How many types of breakdown do Zener diode have? 1 2 3 4 None HintRead more about Breakdown VoltageSemiconductor Theory MCQ's for Interviews70). How many breakdowns do pn junction diode have? 1 2 3 4 None Hint71). What is the voltage value for avalanche breakdown in Zener diode? 5V 6V 3V 7V None Hint72). On supply of which voltage does avalanche breakdown occurs in Zener diode? Forward Reverse Positive Both a and c None Hint73). In which bias does Zener breakdown occurs in Zener diode? Forward Reverse Zero All the above None Hint74). 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? Low High Zero Constant None Hint75). Breakdown region is Zener diode is also called_____ Operating region Non operating region Open circuited region Both b and c None Hint76). A Zener diode has __ number of terminals? 2 3 1 4 None Hint77). The value of current leakage of a Zener diode in reverse bias is ____ Small Large Medium Zero None Hint78). Which of the following are the advantages of Zener diode? Minimum cost Accurate Capacity of power dissipation is large All the above None Hint79). Which of the following are the applications of Zener diode? Voltage regulator Switch Clipper and clamper All the above None Hint80). An avalanche diode operates in __region Forward bias Reverse bias Forward breakdown Reverse breakdown None Hint81). The width of depletion region of avalanche diode is ______ Thin Thick Zero All the above None Hint82). Which of the following are the applications of avalanche diode? White noise Switches Clampers All the above None Hint84). Which of the following is the source of photo diode? Light Air Gas Water None Hint85). Photo diode operates in ___direction? Uni Bi Two Multi None Hint86). Photo diode operates in ___ bias? Forward Reverse Either forward or reverse All the above None Hint87). PIN diode is used in ___ type of applications? High speed Low speed Medium speed All the above None Hint88). Which of the following is the additional representation of photo diode compared to pn diode? +terminal -terminal Arrow striking Inward line None Hint89). Which of the following are the characteristics of pin diode? High gain Minimum cost Long lifespan All the above None Hint90). Photo diodes are classified into __ number of types? 2 3 1 4 None Hint91). Which of the following characteristic varies for pin diode compared to pn junction diode? Operation Construction Advantages Manufacturing None Hint92). A pin diode has __ number of layers? 2 3 4 5 None Hint93). The width of pin diode is _____ Thin Thick Medium Zero None Hint94). In which bias condition does pin diode act as resistor? Forward Reverse Both a and b None of the above None Hint95). What is the value of capacitance of a pin junction diode? High Low Medium Zero None Hint96). Which of the following are the advantages of pin diode? Bandwidth is wide Efficiency of quantum is high Speed of response is high All the above None Hint97). Which of the following are the applications of photo diode? Smoke detectors Disc players Optical devices All the above None Hint98). A laser diode is also called as ____ Injection lasers Junction lasers Semiconductor lasers All the above None Hint99). The width of laser diode in forward bias is ______ Thin Thick Wide Zero None Hint100). Which of the following are the applications of laser diode? Laser type pointers Fiber optics Barcode reader All the above None Hint Time's up
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