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 diode Tuning diode Parametric diode All of the above HintThe varactor diode is also called a varicap or tuning or parametric diode Read more about Varactor Diode2). Which one of the following diodes is also called a hot carrier diode? Schottky diode PN diode PIN diode None of the above HintThe Schottky diode is also called a hot carrier diode3). What are the advantages of C-filter? Low-cost Good characteristics Small in size All of the above HintThe advantages of C-filter are low cost, it has good characteristics, and small in size4). Which one of the following is a semiconductor material? Germanium Silicon Carbon All of the above HintThe germanium, carbon, silicon are few semiconductor materials5). Which one of the following is a majority current carrier in N-type semiconductors? Free electrons Holes Both a and b None of the above HintThe free electrons are the majority current carriers in N-type semiconductor6). In which one of the following diode the electricity flows in one direction? P-N junction diode Zener diode Both a and b None of the above HintIn the PN junction diode the electricity flows in one direction7). Which one of the following diodes is used for rectification? P-N junction diode Zener diode Both a and b None of the above HintThe PN junction diode is used for rectification8). Which one of the following semiconductors is a pure semiconductor? Intrinsic Extrinsic Both a and b None of the above HintThe purity of intrinsic semiconductors is pure9). The density of electrons in an intrinsic semiconductor is ____________ the density of holes Less than Equal to Greater than Not equal to HintThe density of electrons in an intrinsic semiconductor is equal to the density of holes 10). The electrical conductivity in an intrinsic semiconductor is _______________ High Very high Low Medium HintThe electrical conductivity in an intrinsic semiconductor is low11). The ratio of minority and majority carriers in an extrinsic semiconductor is ____________ Unity Not unity One Infinity HintThe ratio of minority and majority carriers in an extrinsic semiconductor is not unity 12). Which one of the following has a low operating temperature? Intrinsic Extrinsic Both a and b None of the above HintAn intrinsic semiconductor has a low operating temperature13). The acceptor impurities are used in ___________ type semiconductor N-type P-type Both a and b None of the above HintThe acceptor impurities are used in N-type semiconductor14). _______________ are the examples of compound semiconductor GaP Cds GaAs All of the above HintThe GaP, Cds, and GaAs are examples of compound semiconductor15). _______________ are the pentavalent impurities Arsenic, antimony Phosphorous Bismuth All of the above HintThe arsenic, antimony, phosphorous are the pentavalent impurities16). ______________ are the trivalent impurities Aluminium, boron Gallium Indium All of the above HintThe aluminum, boron, gallium, and indium are the trivalent impurities17). How many valence electrons do trivalent impurities have? One Two Three Four HintThe trivalent impurities have three valence electrons18). The threshold voltage/barrier potential of germanium diode is _______________ 1 volts 0.3 volts 10 volts 100 volts HintThe threshold voltage/barrier potential of germanium diode is 0.3 volts19). The Zener diode is used for ______________ Rectification Voltage regulation Both a and b None of the above HintThe Zener diode is used for voltage regulation Read more about Zener Diode20). Which one of the following is a majority current carrier in P-type semiconductors? Free electrons Holes Both a and b None of the above HintThe holes are the majority current carrier in P-type semiconductors21).The density of electrons in an extrinsic semiconductor is _______________ the density of holes Equal to Not equal to Greater than Less than HintThe density of electrons in an extrinsic semiconductor is not equal to the density of holes22). The electrical conductivity in an extrinsic semiconductor is _______________ High Very low Low Better HintThe electrical conductivity in an extrinsic semiconductor is high23). The ratio of minority carriers in an intrinsic semiconductor is _______________ One Two Unity Not unity HintThe ratio of minority carriers in an intrinsic semiconductor is unity24). The donor impurities are used in ______________ type semiconductor P-type N-type Both a and b None of the above HintThe donor impurities are used in P-type semiconductor25). The current in ______________ region is infinite Conduction Non-conduction Both a and b None of the above HintThe current in the conduction region is infiniteSemiconductor Diode Important MCQs26). The doped semiconductor materials are categorized into __________ One Two Three Four HintThe doped semiconductor materials are categorized into two types they are N-type and P-type27). ____________ are the diode operating conditions No bias Forward bias Reverse bias All of the above HintThe no bias, forward bias, and reverse bias are the diode operating conditions28). How many types of resistance are there? One Two Three Four HintThere are three types of resistances are there they are DC, AC, and average AC resistance29). Which band contains valence electrons? Valance band Conduction band Forbidden None of the above HintThe valence band contains valence electrons30). Which band contains free electrons? Valance band Conduction band Forbidden None of the above HintThe conduction band contains free electrons31). Which one of the following separates conduction and valence band? Forbidden energy band Conductors Insulators All of the above HintThe forbidden energy band separates conduction and valence band32). In ____________ band no electrons exist Forbidden energy band Conductors Insulators All of the above HintIn a forbidden band, no electrons exist33).The forbidden gap measured in terms of _______________ Amperes Ohms Electron volts None of the above HintThe forbidden gap measured in terms of electron volts34). Based on the width of the forbidden gap the materials are categorized into __________ types One Two Three Four HintBased on the width of the forbidden gap the materials are categorized into three types they are insulators, semiconductors, and conductors35). _____________ are the examples of conductor Metals Saltwater Both a and b None of the above HintThe metals, saltwater, etc are examples of conductor36). _____________ are the examples of insulator Wood, paper Saltwater, metals Ge, si, GaAs None of the above HintThe wood, paper, etc are examples of insulator37). Which one of the following materials doesn’t conduct any current? Conductor Insulator Semiconductor All of the above HintThe insulator doesn’t conduct any current38). How many valance electrons do insulators have in their outermost orbit? Two Four Eight Sixteen HintThe insulators have eight valance electrons in their outermost orbit 39). ___________ are formed due to ionic bonding Insulators Conductors Semiconductors All of the above HintAn insulators are formed due to ionic bonding40). In ___________ region the diode acts like open Conduction Non-conduction Both a and b None of the above HintIn non-conduction region the diode acts like open41). The resistance is very high in ______________ Insulators Conductors Semiconductors All of the above HintThe resistance is very high in insulators42). Which one of the following materials has a negative temperature coefficient? Insulators Conductors Semiconductors Both b and c HintThe conductors and semiconductor materials have a negative temperature coefficient43). How many valence electrons do conductors have? One Two Three Four HintThe conductors have only one valence electron in their outermost orbit44). In which one of the following materials the resistance is very small? Insulators Conductors Semiconductors None of the above HintIn conductors the resistance is very small45). The energy gap in semiconductors is from ________ 1 ev to 10 ev 0.7 ev to 2 ev 1 ev to 20 ev 1 ev to 100 ev HintThe energy gap in semiconductors is from 0.7 EV to 2 EV46). The energy gap in conductors is from ________ 0.01 ev 0.7 ev to 2 ev 1 ev to 20 ev 1 ev to 100 ev HintThe energy gap in conductors is from 0.01 ev47). _____________ are formed by covalent bonding Insulators Conductors Semiconductors None of the above HintThe semiconductors are formed by covalent bonding48). _____________ are formed by metallic bonding Insulators Conductors Semiconductors None of the above HintThe conductors are formed by metallic bonding49). The number of carriers at normal temperature is low in ____________ Insulators Conductors Semiconductors None of the above HintThe number of carriers at normal temperature is low in semiconductor50). What is the standard form of TVS diode? Transient Voltage Suppression Transparent Voltage Suppression Transistor Voltage Suppression None of the above HintThe standard form of TVS diode is Transient Voltage Suppression Semiconductor Diode MCQs with Hints51). How many valence electrons do semiconductors have? One Two Three Four HintThe semiconductors have four valence electrons in their outermost orbit52). The energy gap in insulators is from ________ 1 ev to 10 ev 0.7 ev to 2 ev 5 ev 1 ev to 100 ev HintThe energy gap in insulators is 5 ev53). ______________ breakdown temperature coefficient is positive Avalanche Zener Both a and b None of the above HintIn avalanche diode the breakdown temperature coefficient is positive54). The doping levels in conventional diode are _____________ Very high High Very low Moderate HintThe doping levels in conventional diode are moderate55). The cut-in voltage in conventional diode is ____________ for silicon 0.6 to 0.7 volts 1 to 2 volts 10 to 20 volts 1 to 25 volts HintThe cut-in voltage in conventional diode is 0.6 to 0.7 volts for silicon56). The cut-in voltage in tunnel diode is ____________ 0.1 volts 1 to 2 volts 10 to 20 volts 1 to 25 volts HintThe cut-in voltage in tunnel diode is 0.1 volts 57). Which one of the following diodes is introduced by Esaki? Varactor diode PN diode Laser diode Tunnel diode HintThe tunnel diode is introduced by Esaki58). The frequency range of the PN-junction diode is _________ Up to 1MHz Up to 2MHz Up to 5MHz Up to 10MHz HintThe frequency range of the PN-junction diode is up to 10MHz59). The frequency range of the Schottky diode is _________ Up to 1MHz Up to 25MHz Up to 100MHz Up to 300MHz HintThe frequency range of the Schottky diode is more than 300MHz60). The doping levels in tunnel diode are _____________ Very high High Very low Moderate HintThe doping levels in tunnel diode are very high61). Which one of the following breakdowns occurs in heavily doped diodes? Zener Avalanche Both a and b None of the above HintThe Zener breakdown occurs in heavily doped diodes62). ___________ breakdown occurs at the low reverse bias voltages Zener Avalanche Both a and b None of the above HintThe Zener breakdown occurs at the low reverse bias voltages63). The light-emitting diodes has _______________ Low efficiency Slow response time Lower data transmission rate All of the above HintThe light-emitting diodes has low efficiency, slow response time, and lower data transmission rate64). The laser diodes has _______________ High efficiency Fast response time Higher data transmission rat All of the above HintThe laser diodes have high efficiency, fast response time, and higher data transmission rate65). Which one of the following provides less distortion? LED Laser diode Both a and b None of the above HintThe laser diodes provide less distortion compares to LED66). Which one of the following diodes works on the electro luminance principle? LED Photo-diode Both a and b None of the above HintThe light-emitting diode works on the electro luminance principle67). Which one of the following diodes converts light energy into electrical energy? LED Photo-diode Both a and b None of the above HintThe photo-diode converts light energy into electrical energy68). The biasing mode of LED is ____________ Only forward Only reverse Either forward or revere None of the above HintThe biasing mode of LED is forward only69). How many PN junctions do crystal diodes have? One Two Three Four HintThe crystal diodes have only one PN junction70). Which one of the following breakdowns occurs in lightly doped diodes? Zener Avalanche Both a and b None of the above HintThe avalanche breakdown occurs in lightly doped diodes71). ___________ breakdown occurs at the high reverse bias voltages Zener Avalanche Both a and b None of the above HintThe avalanche breakdown occurs at the high reverse bias voltages72). Which one of the following diodes works on the photoconduction principle? LED Photodiode Both a and b None of the above HintThe photodiode works on the photoconduction principle73). What are the applications of a photodiode? Used in consumer electronic devices Used in medical and scientific instruments Optical communication All of the above HintThe photodiodes are used in consumer electronic devices, medical and scientific instruments, optical communication, etc.74). ______________ diode is also known as surface barrier diode Schottky diode Zener Avalanche None of the above HintThe Schottky diode is also known as surface barrier diode75). Which one of the following diodes is also known as a transferred electron device? Schottky diode Zener Avalanche Gunn HintThe Gunn diode is also known as transferred electron deviceSemiconductor Diode MCQs for Exams76). Which one of the following diodes is discovered by John Battiscombe Gunn? Schottky diode Zener Avalanche Gunn HintThe Gunn diode is discovered by John Battiscombe Gunn77). In how many modes does the PN junction works? One Two Three Four HintIn two modes PN junction works they are forward bias and reverse bias mode78). What are the advantages of the PN junction diode? Occupies lesser space No filament is necessary Long life All of the above HintThe advantages of the PN junction diode are it occupies less space, no filament is necessary, and it has a long life79). What are the applications of the PN junction diode? Rectifiers Switch Detectors All of the above HintThe PN junction diode used as rectifiers, switch, and detectors, etc80). The polyethylene is an example for ______________ Insulator Conductor Semiconductor None of the above HintThe polyethylene is an example of an insulator81). Which one of the following diodes is discovered by Melvin Zener? Schottky diode Zener Avalanche Gunn HintThe Zener diode is discovered by Melvin Zener 82). The copper or aluminum is an example for ______________ Insulator Conductor Semiconductor None of the above HintThe copper or aluminum is an example of the conductor83). Which one of the following diodes produces voltage-dependent capacitor? Varactor Tunnel Zener All of the above HintThe varactor diodes produces voltage-dependent capacitor84). Which one of the following diodes is used for mixing and detection of microwave signals? Crystal Schottky Both a and b None of the above HintThe crystal and Schottky diodes both are used for mixing and detection of microwave signals85). The PIN diodes are used for _____________ Switching Modulation Attenuation All of the above HintThe PIN diodes are used for switching, modulation, and also used for attenuation86). The varactor diodes are used for _____________ Amplification Frequency multiplication Tuning All of the above HintThe varactor diodes are used for amplification, frequency multiplication, and tuning87). Which one of the following diodes is used for oscillation? Tunnel Gunn Both a and b None of the above HintThe Gunn and tunnel diodes both are used for oscillation88). The peak inverse voltage of silicon diode is ______________ 10 volts 50 volts 100 volts 1000 volts HintThe peak inverse voltage of silicon diode is 1000 volts89). The threshold voltage/barrier potential of silicon diode is _______________ 1 volts 0.6 volts 10 volts 100 volts HintThe threshold voltage/barrier potential of silicon diode is 0.6 volts90). The PIV of germanium diode is _______________ volts 1000 volts 2000 volts 3000 volts 4000 volts HintThe PIV of germanium diode is 4000 volts91). The forward voltage drop of germanium diode is ______________ 0.1 volts 0.0001 volts 0.3 volts 10 volts HintThe forward voltage drop of germanium diode is 0.3 volts92). How many types of photodiodes are there? One Two Three Four HintThe photodiodes are of two types they are PN and PIN photodiodes93). In how many modes does photodiode works? One Two Three Four HintThe photodiodes works in two modes they are photoconductive mode, and photovoltaic mode94). How many terminals does the silicon PIN diode consist of? One Two Three Four HintThe silicon PIN diode consists of two terminals95). The breakdown voltage of silicon PIN diode is ___________ 10 V 20 V 30 V 50 V HintThe breakdown voltage of silicon PIN diode is 50 V96). The lower frequency limit of silicon PIN diode is ___________ 1 MHz 2 MHz 5 MHz 10 MHz HintThe lower frequency limit of the silicon PIN diode is 10 MHz97). The driver circuit complexity is _____________ in silicon PIN diode Very low Low High Moderate HintThe driver circuit complexity is high in silicon PIN diode98). The electrical resistivity of silicon is _____________ 1 ohm meter 2 ohm meter 3 ohm meter 5 ohm meter HintThe electrical resistivity of silicon is 1 ohm meter99). The electrical resistivity of germanium is _____________ 10 ohm meter 2 ohm meter 3 ohm meter 5 ohm meter HintThe electrical resistivity of germanium is 10 ohm meter100). The energy gap at zero degree kelvin in silicon is _____________ 3.8ev 1.21ev 6.7ev 4.5ev HintThe energy gap at zero degrees kelvin in silicon is 1.21 ev Time is Up! Time's up
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