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 HintThe current range of semiconducting material ranges above 4000 Amps.2). Which of the following is voltage range of semiconducting material? 100,000 10000 100 10 HintThe voltage range of semiconducting material is above 100000.3). What happens to resistivity of semiconductor material when temperature increases? Increases Decreases Zero Constant HintThe value of resistivity of semiconductor material decreases when temperature increases.4). Which of the following is a semiconducting material? Copper Iron Wood Silicon HintSilicon is a semiconducting material.5). Which of the following are the charge carriers of semiconducting materials? Electrons Holes Neutrons Both a and b HintElectrons and holes are the charge carriers of semiconducting materials.6). Which of the following are applications of semiconducting device? IC Solar cells Laser diodes All the above HintThe 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? Silicon Crystal Germanium Gallium HintSilicon semiconducting material is most commonly used.8). How much quantity of pentavalent element is added to increase the conductivity value of Silcon material? 10 ^8 10^3 10^2 10^9 Hint10^8 quantity of pentavalent element is added to increase the conductivity value of Silicon material.9). Which of the following is a pentavalent substance? Phosphorous Gallium Indium Boron HintPhosphorous, antimony, and arsenic are pentavalent substances.10). Which of the following is a trivalent substance? Gallium Arsenic Antimony Phosphorous HintGallium, boron, and indium are trivalent substances.11). A p-type semiconductors has ___ as majority charge carriers? Holes Electrons Neutrons All the above HintA p-type semiconductor has holes as the majority charge carriers.12). A n-type semiconductors has ___ as majority charge carriers? Holes Electrons Neutrons All the above HintAn 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_____ Extraction Doping Extrinsic semiconductors Both b and c HintThe 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 property Mathematical representation Quantum physics All the above HintThe 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? Increases Decreases Zero Constant HintOn performing doping process in a semiconducting device, crystals charge carriers increases.16). How many type of dopants does a semiconductor device has? 2 3 4 1 HintA 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-type N-type P-N junction All the above HintIn the p-n diode, the P_N junction region is the reason for electronic behavior.18). Who developed semiconductor device? James Henry Denis Richard Karl Braun HintKarl Braun in the year 1874 has developed a semiconducting device called crystal.19). Which of the following is the first semiconducting device discovered? Crystal Silicon Germanium Copper HintCrystal is the first semiconducting device discovered.20). 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 HintMOSFET stands for Metal oxide semiconductor field effect transistor Read more about MOSFET21). How many semiconducting theory property are present? 2 3 4 6 HintThere 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 arsenide Hydrogen Carbon All the above HintGallium Arsenide is a semi-insulator.Semiconductor Theory Questions and Answers23). With which type of bond a semiconductor substance is formed? Coordinate Covalent Electrovalent All the above HintA covalent type bond is used to develop a semiconductor substance.24). The temperature coefficient of a resistance for a semiconductor is _______ Negative Positive Zero Infinity HintThe temperature coefficient of resistance for a semiconductor is a negative value.25). How much valence of electrons do semiconductors have? 2 3 4 5 HintSemiconductors have 4 valences of electrons.26). Which of the following is the resistivity value of silicon semiconductor at standard based condition? 5000 ohms 6000 ohms 3000 ohms 4000 ohms HintThe 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 bond Proton-proton force Nuclei-Nuclei force Both a and b HintOn 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? Insulator Conductor P-type N-type HintA 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? Holes Electrons Protons Both a and b HintA 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? 2 3 4 5 HintA 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? 2 3 4 5 HintA semiconducting substance added with trivalent type impurity has 3 electron valence.32). A semiconducting substance added with trivalent type impurity produces ____ type of substance? Insulator Conductor P-type N-type HintA 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 atoms 1-108atoms 100-108atoms 110-200atoms HintThe impurity range of an extrinsic type semiconductor is 1-108atoms.34). What happens to semiconductor resistance when doping quantity increases? Increases Decreases Zero Infinity HintThe semiconductor resistance value decreases when doping quantity increases.35). When hole and electron carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c HintWhen hole and electron are placed together then their behavior attracts.36). When hole and hole carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c HintWhen 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 ___ Attract Repel Bombard Both a and c HintWhen electron and electron carriers are placed together then their behavior attracts or is bombard.38). Which of the following is responsible for semiconductors conduction? Electrons Holes Neutrons Both a and b HintBoth 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. Pressure Diffusion Ionization Both a and b HintDiffusion 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? Ohms Kilo ohms Megaohms All the above HintThe resistance order of a forward biased p-n junction diode is ohms.Semiconductor 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 HintThe 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? Positive Negative Zero Both a and b HintIn 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? Positive Negative Zero Both a and b HintIn 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? Positive Negative Zero Both a and b HintIn 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? Positive Negative Zero Both a and b HintIn 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? Positive Negative Zero Both a and b HintIn 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? 2V 5V 0V 3V HintThe 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 alone Holes alone Both electrons and holes Neutrons HintBoth 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? 0A 5A 3A Infinity HintThe 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 switch Acts as a bi-direction type switch Acts as a battery All the above HintThe function of PN junction is acts as a single direction switch.51). A PN junction diode has ___ number of terminals? 2 3 4 1 HintA PN junction diode has 2 terminals like positive and negative.52). Anode terminal of PN junction diode is represented with______ symbol + - * Either a or HintAnode 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 b HintA 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_______ Doping Biasing Sourcing None of the above HintThe 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 ____ Thin Thick Medium Zero HintThe width of pn junction in forward bias is thin.56). The width of pn junction in reverse bias is ____ Thin Thick Medium Zero HintThe width of the pn junction in reverse bias is thick.57). The barrier formed in pn junction diode on voltage supplied is called______ Depletion region Breakdown region Blockage region All the above HintThe 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? 0.7 0.3 0.5 0.4 HintThe forward bias voltage value of silicon semiconductor is 0.7V.59). Which of the following is the forward bias voltage value of germanium semiconductor? 0.7 0.3 0.5 0.4 HintThe 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? 0.7V 0.6V 0V 0.1V HintIf 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? 0.7V 0.6V 0V 0.1V HintIf 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 DC Allows current in single direction Blocks current flow in opposite direction All the above HintThe 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 diode LED Tunnel diode All the above HintDifferent 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? Large Small Zero Infinity HintA Zener diode in forward bias has a small value of resistance.65). A Zener diode has ___ quantity of doping value compared to pn junction diode High Low Medium Zero HintA 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 ____ size Thin Thick Medium Zero HintThe depletion region in the Zener diode is of thin size.67). The flow of current in Zener diode is in ___ direction Uni Bi Single Mukti HintThe flow of current in the Zener diode is in the bi- direction both forward and reverse.68). Who discovered Zener diode? Charles Zener Melvin Zener James Richard HintMelvin Zener discovered Zener's diode.69). How many types of breakdown do Zener diode have? 1 2 3 4 HintZener diode has 2 breakdowns namely Avalanche break down and Zener breakdown. Read more about Breakdown VoltageSemiconductor Theory MCQ's for Interviews70). How many breakdowns do pn junction diode have? 1 2 3 4 HintA PN junction diode has 1 breakdown namely Avalanche breakdown.71). What is the voltage value for avalanche breakdown in Zener diode? 5V 6V 3V 7V HintThe voltage value for avalanche breakdown in the Zener diode is 7V.72). On supply of which voltage does avalanche breakdown occurs in Zener diode? Forward Reverse Positive Both a and c HintOn supply of reverse voltage avalanche breakdown occurs in Zener diode.73). In which bias does Zener breakdown occurs in Zener diode? Forward Reverse Zero All the above HintIn 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? Low High Zero Constant HintWhen 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 region Non operating region Open circuited region Both b and c HintThe Breakdown region is the Zener diode is also called an operating region.76). A Zener diode has __ number of terminals? 2 3 1 4 HintA 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 ____ Small Large Medium Zero HintThe 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 cost Accurate Capacity of power dissipation is large All the above HintThe 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 regulator Switch Clipper and clamper All the above HintThe applications of Zener diode includes voltage regulator, switch, clipper, and clamper in many electronic circuits.80). An avalanche diode operates in __region Forward bias Reverse bias Forward breakdown Reverse breakdown HintAn avalanche diode operates in a reverse breakdown region.81). The width of depletion region of avalanche diode is ______ Thin Thick Zero All the above HintThe width of the depletion region of the avalanche diode is thick.82). Which of the following are the applications of avalanche diode? White noise Switches Clampers All the above HintA 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? Light Air Gas Water HintThe source of photo diode is light.85). Photo diode operates in ___direction? Uni Bi Two Multi HintPhotodiode operates in a single negative direction.86). Photo diode operates in ___ bias? Forward Reverse Either forward or reverse All the above HintPhoto diode operates in reverse bias.87). PIN diode is used in ___ type of applications? High speed Low speed Medium speed All the above HintPIN diode is used in high speed type of applications88). Which of the following is the additional representation of photo diode compared to pn diode? +terminal -terminal Arrow striking Inward line HintThe additional representation of photo diode compared to pn diode is arrow striking.89). Which of the following are the characteristics of pin diode? High gain Minimum cost Long lifespan All the above HintThe characteristics of pin diode is high gain, minimum cost and long life span.90). Photo diodes are classified into __ number of types? 2 3 1 4 HintPhotodiodes 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? Operation Construction Advantages Manufacturing HintManufacturing characteristic of pin diode varies compared to pn junction diode.92). A pin diode has __ number of layers? 2 3 4 5 Hintpin diode has 3 layers like p, n, and an additional intrinsic layer.93). The width of pin diode is _____ Thin Thick Medium Zero HintThe width of pin diode is thick.94). In which bias condition does pin diode act as resistor? Forward Reverse Both a and b None of the above HintIn forward bias condition pin diode act as a resistor.95). What is the value of capacitance of a pin junction diode? High Low Medium Zero HintThe value of capacitance of a pin junction diode is low.96). 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 HintThe 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 detectors Disc players Optical devices All the above HintThe applications of photo diode include smoke detectors, disc players and optical devices.98). A laser diode is also called as ____ Injection lasers Junction lasers Semiconductor lasers All the above HintA laser diode is also called an injection laser, junction laser, and semiconductor laser.99). The width of laser diode in forward bias is ______ Thin Thick Wide Zero HintThe width of a laser diode in forward bias is thin.100). Which of the following are the applications of laser diode? Laser type pointers Fiber optics Barcode reader All the above HintThe applications of laser diode include laser type pointer, fiber optics, and barcode readers. Time is Up! Time's up
Leave a Reply