Semiconductor Theory Question & Answers September 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 Hint 2). Which of the following is voltage range of semiconducting material? 100,000 10000 100 10 Hint 3). What happens to resistivity of semiconductor material when temperature increases? Increases Decreases Zero Constant Hint 4). Which of the following is a semiconducting material? Copper Iron Wood Silicon Hint 5). Which of the following are the charge carriers of semiconducting materials? Electrons Holes Neutrons Both a and b Hint 6). Which of the following are applications of semiconducting device? IC Solar cells Laser diodes All the above Hint Read more about Solar Cell 7). Which of the following semiconducting material is most commonly used? Silicon Crystal Germanium Gallium Hint 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 Hint 9). Which of the following is a pentavalent substance? Phosphorous Gallium Indium Boron Hint 10). Which of the following is a trivalent substance? Gallium Arsenic Antimony Phosphorous Hint 11). A p-type semiconductors has ___ as majority charge carriers? Holes Electrons Neutrons All the above Hint 12). A n-type semiconductors has ___ as majority charge carriers? Holes Electrons Neutrons All the above Hint 13). The process of adding either holes or electrons to a semiconducting substance is called_____ Extraction Doping Extrinsic semiconductors Both b and c Hint 14). The properties of semiconductors depends on ____ Chemical property Mathematical representation Quantum physics All the above Hint 15). On performing doping process in a semiconducting device, what happens to crystals charge carriers? Increases Decreases Zero Constant Hint 16). How many type of dopants does a semiconductor device has? 2 3 4 1 Hint 17). Which of the following in p-n diode, is reason for electronic behavior? P-type N-type P-N junction All the above Hint 18). Who developed semiconductor device? James Henry Denis Richard Karl Braun Hint 19). Which of the following is the first semiconducting device discovered? Crystal Silicon Germanium Copper Hint 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 Hint Read more about MOSFET 21). How many semiconducting theory property are present? 2 3 4 6 Hint 22). Which of the following is an semi-insulator? Gallium arsenide Hydrogen Carbon All the above Hint Semiconductor Theory Questions and Answers 23). With which type of bond a semiconductor substance is formed? Coordinate Covalent Electrovalent All the above Hint 24). The temperature coefficient of a resistance for a semiconductor is _______ Negative Positive Zero Infinity Hint 25). How much valence of electrons do semiconductors have? 2 3 4 5 Hint 26). Which of the following is the resistivity value of silicon semiconductor at standard based condition? 5000 ohms 6000 ohms 3000 ohms 4000 ohms Hint 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 Hint 28). A semiconducting substance added with pentavalent type impurity produces ____ type of substance? Insulator Conductor P-type N-type Hint 29). A semiconducting substance added with pentavalent type impurity generates which of the following majority carriers? Holes Electrons Protons Both a and b Hint 30). A semiconducting substance added with pentavalent type impurity has ___ value of electron valence? 2 3 4 5 Hint 31). A semiconducting substance added with trivalent type impurity has ___ value of electron valence? 2 3 4 5 Hint 32). A semiconducting substance added with trivalent type impurity produces ____ type of substance? Insulator Conductor P-type N-type Hint 33). Which of the following is the impurity range of an extrinsic type semiconductor? 10 - 108 atoms 1-108atoms 100-108atoms 110-200atoms Hint 34). What happens to semiconductor resistance when doping quantity increases? Increases Decreases Zero Infinity Hint 35). When hole and electron carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c Hint 36). When hole and hole carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c Hint 37). When electron and electron carriers are placed together then their behavior ___ Attract Repel Bombard Both a and c Hint 38). Which of the following is responsible for semiconductors conduction? Electrons Holes Neutrons Both a and b Hint 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 Hint 40). What is resistance order of a forward biased p-n junction diode? Ohms Kilo ohms Megaohms All the above Hint Semiconductor Theory Important MCQ's with Hints 41). What is resistance order of a reverse biased p-n junction diode? Ohms Kilo ohms Megaohms All the above Hint 42). In pn junction diode, the positive terminal in forward bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b Hint 43). In PN junction diode, the negative terminal in forward bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b Hint 44). In pn junction diode, the negative terminal in reverse bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b Hint 45). In PN junction diode, the negative terminal in reverse bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b Hint 46). In pn junction diode, the positive terminal in reverse bias is connected to ____ polarity of battery? Positive Negative Zero Both a and b Hint 47). What is the voltage value of germanium in a PN junction diode? 2V 5V 0V 3V Hint 48). Which of the following carriers are stored in depletion region of PN junction diode? Electrons alone Holes alone Both electrons and holes Neutrons Hint 49). How much current value do a PN based junction in reverse type bias has? 0A 5A 3A Infinity Hint 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 Hint 51). A PN junction diode has ___ number of terminals? 2 3 4 1 Hint 52). Anode terminal of PN junction diode is represented with______ symbol + - * Either a or Hint 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 Hint 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 Hint 55). The width of PN junction in forward bias is ____ Thin Thick Medium Zero Hint 56). The width of pn junction in reverse bias is ____ Thin Thick Medium Zero Hint 57). The barrier formed in pn junction diode on voltage supplied is called______ Depletion region Breakdown region Blockage region All the above Hint 58). Which of the following is the forward bias voltage value of silicon semiconductor? 0.7 0.3 0.5 0.4 Hint 59). Which of the following is the forward bias voltage value of germanium semiconductor? 0.7 0.3 0.5 0.4 Hint 60). If voltage of silicon diode is less than 0.7v, what will be its output voltage? 0.7V 0.6V 0V 0.1V Hint 61). If voltage of germanium diode is less than 0.3v, what will be its output voltage? 0.7V 0.6V 0V 0.1V Hint 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 Hint 63). Which of the following are different types of semiconducting diodes? Zener diode LED Tunnel diode All the above Hint Read more about LED. 64). A Zener diode in forward bias has ___ value of resistance? Large Small Zero Infinity Hint 65). A Zener diode has ___ quantity of doping value compared to pn junction diode High Low Medium Zero Hint Read more about Zener Diode. 66). The depletion region in Zener diode is of ____ size Thin Thick Medium Zero Hint 67). The flow of current in Zener diode is in ___ direction Uni Bi Single Mukti Hint 68). Who discovered Zener diode? Charles Zener Melvin Zener James Richard Hint 69). How many types of breakdown do Zener diode have? 1 2 3 4 Hint Read more about Breakdown Voltage Semiconductor Theory MCQ's for Interviews 70). How many breakdowns do pn junction diode have? 1 2 3 4 Hint 71). What is the voltage value for avalanche breakdown in Zener diode? 5V 6V 3V 7V Hint 72). On supply of which voltage does avalanche breakdown occurs in Zener diode? Forward Reverse Positive Both a and c Hint 73). In which bias does Zener breakdown occurs in Zener diode? Forward Reverse Zero All the above Hint 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 Hint 75). Breakdown region is Zener diode is also called_____ Operating region Non operating region Open circuited region Both b and c Hint 76). A Zener diode has __ number of terminals? 2 3 1 4 Hint 77). The value of current leakage of a Zener diode in reverse bias is ____ Small Large Medium Zero Hint 78). Which of the following are the advantages of Zener diode? Minimum cost Accurate Capacity of power dissipation is large All the above Hint 79). Which of the following are the applications of Zener diode? Voltage regulator Switch Clipper and clamper All the above Hint 80). An avalanche diode operates in __region Forward bias Reverse bias Forward breakdown Reverse breakdown Hint 81). The width of depletion region of avalanche diode is ______ Thin Thick Zero All the above Hint 82). Which of the following are the applications of avalanche diode? White noise Switches Clampers All the above Hint 84). Which of the following is the source of photo diode? Light Air Gas Water Hint 85). Photo diode operates in ___direction? Uni Bi Two Multi Hint 86). Photo diode operates in ___ bias? Forward Reverse Either forward or reverse All the above Hint 87). PIN diode is used in ___ type of applications? High speed Low speed Medium speed All the above Hint 88). Which of the following is the additional representation of photo diode compared to pn diode? +terminal -terminal Arrow striking Inward line Hint 89). Which of the following are the characteristics of pin diode? High gain Minimum cost Long lifespan All the above Hint 90). Photo diodes are classified into __ number of types? 2 3 1 4 Hint 91). Which of the following characteristic varies for pin diode compared to pn junction diode? Operation Construction Advantages Manufacturing Hint 92). A pin diode has __ number of layers? 2 3 4 5 Hint 93). The width of pin diode is _____ Thin Thick Medium Zero Hint 94). In which bias condition does pin diode act as resistor? Forward Reverse Both a and b None of the above Hint 95). What is the value of capacitance of a pin junction diode? High Low Medium Zero Hint 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 Hint 97). Which of the following are the applications of photo diode? Smoke detectors Disc players Optical devices All the above Hint 98). A laser diode is also called as ____ Injection lasers Junction lasers Semiconductor lasers All the above Hint 99). The width of laser diode in forward bias is ______ Thin Thick Wide Zero Hint 100). Which of the following are the applications of laser diode? Laser type pointers Fiber optics Barcode reader All the above Hint Time is Up! Time's up
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