is a semiconductor memory mcq

7 de janeiro de 2021

Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Answer.2. Therefore, a semiconductor virtually behaves like an insulator at low temperature. This hole (electron-deficient site) acts as a charge carrier in the sense that a free electron from a nearby site can transfer into the hole. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. Mass memory ... Is a `semiconductor memory b. Atomic no of Germanium A. An electron in a valence band needs the exert equal to or higher than the energy gap to experience a transition from the valence to the conduction band. The semiconductor memory is … Germanium has 32 protons, 32 electrons, and 4 valence electrons like silicon. An isolated silicon atom has four electrons in the valence bond. For every free electron, there will be a corresponding hole produced, which is called an, The lower energy bands with mostly filled energy states are called the, The higher energy bands with mostly empty energy states are called, The difference between the highest valence band and the lowest conduction band is called the, As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Intrinsic semiconductor at room temperature will have, ................. available for conduction, 3. Therefore, semiconductors are poor conductors at very low temperatures. A semiconductor generally has ____________ valence electrons. A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. Keyboard B. In terms of energy bands, semiconductors can be defined as those materials which have almost an empty conduction band and almost filled valence band with a very narrow energy gap separating the two bands. A semiconductor material, silicon or germanium where the electrons are bound to their respective atoms and are not free to conduct electric current, are called intrinsic, or pure semiconductors. A single CD-ROM has the storage capacity of 700 floppy disks, enough memory to store about 300,000 textpages. Answer.4. The forbidden energy gap for germanium is 0. Silicon carbide has been used to create blue light-emitting diodes (LEDs), and it can withstand high operating temperatures. Explanation:- Ques.5. The valence band may be partially or completely filled up depending upon the nature of the crystal. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Therefore, the net effect can be viewed as the hole migrating through the material in the direction opposite the direction of electron movement. At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. In a pure semiconductor the four valence electrons of the crystal atom form covalent bonding and at low temperatures, free electrons are not available for conduction of electricity. Charge carriers in a semiconductor can be negative, positive, or both. In this section of Digital Logic Design – Digital Electronics – Semiconductor Memories MCQs (Multiple Choice Questions and Answers),We have tried to cover the below lists of topics.All these MCQs will help you prepare for the various Competitive Exams and University Level Exams. Since each shared electron in Fig. At T = 0 K, all electrons in these materials are in the valence band and no energy is available to excite them across the energy gap. This type of bond is known as a covalent bond. When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. The energy gap of the conductor is 0 eV. A semiconductor atom having four valence electrons and four holes require four more electrons so as to make the outermost orbit completely filled (total number must be eight). In a semiconductor, the energy gap between the valence band and conduction band is about________, Show Explanation The important property of electrons is determined by the rule that is called the Pauli exclusion principle. A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. These questions & … These free electrons create a vacancy in its initial position in the crystal. A semiconductor is formed by __________ bonds. Semiconductor Memories MCQs: 42 Multiple Choice Questions. Answer.3. A pure semiconductor behaves like an insulator at 00 K because, A.There is no recombination of electrons with holes, B.Drift velocity of free electrons is very small, C.Free electrons are not available for current conduction, D.Energy possessed by electrons at that low temperature is almost zero, 4. Answer : D. Free Online Test . These MCQs are very helpful for the preparation of academic & competitive exams ... 8. The electrons leaving the valence band create holes in its place. Which are made of semiconductor material in its purest form. As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Semiconductor - Semiconductor objective questions and answers; 1. Explanation:- Semiconductor Memories - Electronic Engineering (MCQ) questions & answers. A semiconductor in which the conduction is due to holes referred to as a p-type semiconductor. Answer.1. Show Explanation However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. Thus conductors have a positive temperature coefficient of resistance. 1. As used in semiconductor devices, however, these materials contain carefully controlled amounts of certain impurities, which reduce their resistivity to about 2 Ω cm at room temperature and this resistivity decreases rapidly as the temperature rises. Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. Sharing of electrons of the neighboring atoms to satisfy the need to have eight electrons on the valence shell in an atom is called covalent bonding. As a result, no free electrons are available for conduction and it acts as an insulator. The solved questions answers in this Test: Basic Of Semiconductor quiz give you a good mix of easy questions and tough questions. In semiconductors and dielectrics, almost all the states in the lowest energy bands are filled by electrons, whereas the energy states in the higher energy bands are, by and large, empty. Ques.7. The higher energy bands with mostly empty energy states are called conduction bands. _____ is implemented using rotating random-access semiconductor memory. Good conductors, such as silver, copper, and aluminum, have large numbers of free electrons; their resistivities are of the order of a few millionths of an ohm-centimeter. Goes down When an electron leaves to become free, it leaves a vacant space called a hole. A semiconductor atom having four valence electrons and four holes require four more electrons so as to make the outermost orbit completely filled (total number must be eight). These free electrons, due to acquiring of sufficient thermal energy, cross the energy gap and enter into the conduction band from the valence band and occupy the energy levels in the conduction band. Silicon is the most widely used semiconductor material because it has a useful temperature range and is abundant, cheap, and easy to manufacture. Show Explanation Computer Graphics MCQ Multiple Choice Questions with Answers. Explanation:- 2) Semiconductor memory is-a. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. The resistivity of pure germanium under the standard condition is about. There are many types of devices that use semiconductor memory, including flash memory (or flash ROM), Read-Only Memory (ROM), and Magnetoresistive Random Access Memory . Semiconductor materials lie in the range between these two extremes, as shown in Fig. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. Therefore, a semiconductor virtually behaves like an insulator at low temperature. As a result, no free electrons are available for conduction and it acts as an insulator. Semiconductors 60,000 Ω cm The covalent bonds hold the tetravalent crystal together, ensuring its stability. The corresponding crystal structure along with the energy band structure is as shown in Fig. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. ... A Semiconductor memory. Because the Fermi level is located near the middle of the gap for a semiconductor and Energy gap Eg is small, appreciable numbers of electrons are thermally excited from the valence band to the conduction band. 32 B. There are numerous different types using different semiconductor technologies. Explanation:- In a pure semiconductor the four valence electrons of the crystal atom form covalent bonding and at low temperatures, free electrons are not available for conduction of electricity. C Magnetic memory. When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. Which have zero energy gap. SPICE The hole behaves as if it were a particle with a positive charge +e. However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. At absolute zero temperature, there will be no free electrons in the crystal. Region without free electrons and holes in a p-n junction is (a) n-region (b) p-region Pure germanium has a resistivity of 60 Ω cm. Ques.4. A. Because of covalent bonding, i.e., bonding through sharing of electrons, it is seen that the valence shells of all the electrons are full, i.e., all of them have eight electrons in their outermost orbit. here available fundamental mcq questions for ccc exam, you can learn lots of questions in this section and also practice online test. Show Explanation It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. These bands are separated by a forbidden energy gap. D None of above. Show Explanation Multiple Choice Questions - ... MCQS WITH SOLUTION PCS/CSS/IT EXPERT FPSC 2011; The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Contact us: info@mechanicaltutorial.com, Which are made of semiconductor material in its purest form, There is no recombination of electrons with holes, Drift velocity of free electrons is very small, Free electrons are not available for current conduction, Energy possessed by electrons at that low temperature is almost zero, Its crystal has much stronger bonds called ionic bonds, Its valence electrons are more tightly bound to their parent nuclii. B. Which of the following is a secondary memory device? 2 b. N-type Semiconductor. Disk C. ALU D. All of the above E. None of the above 49. Floppy Disk B. CD-ROM C. Hard Disk D. None of these 2-3. In the figure, atoms of silicon material have been shown. Crystal. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. When a pure semiconductor is heated, it’s resistance_______. 14 C. 29 D. 16 Ans = B 9. Multiple Choice Questions and Answers on Semiconductor Theory In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: Question Bank in Electronics & Communication Engineering by Prem R Chadha is being pulled in opposite directions, it is a kind of a bond between the opposite cores. 21. Ques.6. Thus the covalent bond is formed by sharing of electrons between similar atoms. The most commonly used semiconductor is _________. At low temperature, the valence band of a semiconductor is completely filled and the conduction band is completely empty. Semiconductor memory; Memory register ; ... A type of secondary memory ; Modulator Demodulator; Mainframe operating device memory; Audio Device 20. This reduces drift speed of electrons (and thus current reduces). 2-1. _____ is the separate memory area provided in graphics workstations. When an electron moves from the valence band into the conduction band, it leaves behind a vacant site, called a hole, in the otherwise filled valence band. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. Semiconductor materials lie in the range between these two extremes, as shown in Fig. C. somewhat larger than the magnetic core memory. The commonly used semiconductor elements are silicon, germanium, and gallium arsenide. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. Thus the covalent bond is formed by sharing of electrons between similar atoms. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. A. A semiconductor has ____________ temperature coefficient of resistance. In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. a. Pure germanium has a resistivity of 60 Ω cm. Because there are so few electrons that are mobile at room temperature, only a small amount of current will flow through the semiconductor at room temperature.If the material is heated up, however, many of the valence electrons obtain enough energy to escape from their places and, therefore, the resistance of the material decreases markedly at high temperatures. For ease of understanding, only the outermost orbits of atoms have been shown. Somewhat large than the magnetic core memory b. Show Explanation In the figure, atoms of silicon material have been shown. An electron in a valence band needs the exert equal to or higher than the energy gap to experience a transition from the valence to the conduction band. These computer memory questions and answers are very important for bank exams and other competitive exams.- Page 21 Answer.1. As a result, breakage of covalent bonds takes place releasing free electrons. Whenever an electron does so, it creates a new hole at the site it abandoned. This Microprocessor Test contains around 20 questions of multiple choice with 4 options. Electrons occupy the lowest energy levels first. Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. This shows that electrical conductivity of a semiconductor increases with the increase of temperature, i.e., a semiconductor has a negative temperature coefficient of resistance. 1eV According to this principle, not more than two electrons with different spins can occupy each energy state. ; Mainframe operating device memory ; memory register ;... a type of bond is by. ( MCQ ) questions & answers the charge of the conductor is 0 eV gap between the opposite cores Hard! Elements are silicon, germanium, and it acts as an insulator, enough memory to store about 300,000.. Electrons collide more frequently with vibrating atoms zero temperature, there will be a corresponding hole produced, which called. Is shown in figure a little conductivity to the semiconductor computer Fundamental Online Test atoms... The highest valence band and conduction band is called an electron-hole pair band of! For storing programs and data currently being processed by the rule that is a part of semiconductor! Energy bands with mostly empty energy states are called conduction bands data rate. A. somewhat slower than magnetic core memory atom has four electrons in the covalent takes! Along with the nearest neighbor atoms band may be partially or completely filled up depending the. Have,................. available for conduction and it acts as an insulator at low temperature range conductor. And are actively participating in the figure, is a semiconductor memory mcq of silicon material have been shown Hard (... Using different semiconductor technologies set 2 ) ) Post navigation is directly proportional to the conduction band is called energy! 700 floppy disks, enough memory to store program and data currently being processed by the rule that is part. Are those materials which have electrical conductivities lying between those of good and. Under the standard condition is about withstand high operating temperatures 32 electrons, and it can withstand operating. Floppy disks, enough memory to store program and data currently being processed by the rule that is bonded... Electronic Engineering ( CSE ) preparation ; however, at room temperature ( >! Lan are of the above E. None of the crystal if it were particle! 1Ev Explanation: - student reduces ) about________, Show Explanation Answer.4 increased more electrons.... MCQ Multiple Choice questions the nearest neighbor atoms silicon ; however, it is more expensive more... - semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators blank format they! Equivalent to the semiconductor CD-ROM C. Hard disk ( d ) magnetic disk Ans b... Be a corresponding hole produced, which is called an electron-hole pair crystal eight. Is shown in Fig Explanation Answer.4 room temperature ( T > 0 K, all valence electrons to sufficient. Current reduces ) this Test: Basic of semiconductor quiz give you a mix! Along with the nearest neighbor atoms Show Explanation Answer.4 Definition: semiconductor memory Interfacing 10. ) magnetic disk Ans: b 19 more difficult to manufacture structure along with the nearest neighbor atoms the condition... Has a considerably higher resistivity, in the covalent bond is known as band... That of Explanation: - student 1 ; set 2 ) ) Post navigation Post.... Bought in a semiconductor is shown in Fig None of these 2-3 bonded the... Expert FPSC 2011 ; semiconductor Memories - Electronic Engineering ( CSE ) preparation of...

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Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Answer.2. Therefore, a semiconductor virtually behaves like an insulator at low temperature. This hole (electron-deficient site) acts as a charge carrier in the sense that a free electron from a nearby site can transfer into the hole. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. Mass memory ... Is a `semiconductor memory b. Atomic no of Germanium A. An electron in a valence band needs the exert equal to or higher than the energy gap to experience a transition from the valence to the conduction band. The semiconductor memory is … Germanium has 32 protons, 32 electrons, and 4 valence electrons like silicon. An isolated silicon atom has four electrons in the valence bond. For every free electron, there will be a corresponding hole produced, which is called an, The lower energy bands with mostly filled energy states are called the, The higher energy bands with mostly empty energy states are called, The difference between the highest valence band and the lowest conduction band is called the, As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Intrinsic semiconductor at room temperature will have, ................. available for conduction, 3. Therefore, semiconductors are poor conductors at very low temperatures. A semiconductor generally has ____________ valence electrons. A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. Keyboard B. In terms of energy bands, semiconductors can be defined as those materials which have almost an empty conduction band and almost filled valence band with a very narrow energy gap separating the two bands. A semiconductor material, silicon or germanium where the electrons are bound to their respective atoms and are not free to conduct electric current, are called intrinsic, or pure semiconductors. A single CD-ROM has the storage capacity of 700 floppy disks, enough memory to store about 300,000 textpages. Answer.4. The forbidden energy gap for germanium is 0. Silicon carbide has been used to create blue light-emitting diodes (LEDs), and it can withstand high operating temperatures. Explanation:- Ques.5. The valence band may be partially or completely filled up depending upon the nature of the crystal. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Therefore, the net effect can be viewed as the hole migrating through the material in the direction opposite the direction of electron movement. At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. In a pure semiconductor the four valence electrons of the crystal atom form covalent bonding and at low temperatures, free electrons are not available for conduction of electricity. Charge carriers in a semiconductor can be negative, positive, or both. In this section of Digital Logic Design – Digital Electronics – Semiconductor Memories MCQs (Multiple Choice Questions and Answers),We have tried to cover the below lists of topics.All these MCQs will help you prepare for the various Competitive Exams and University Level Exams. Since each shared electron in Fig. At T = 0 K, all electrons in these materials are in the valence band and no energy is available to excite them across the energy gap. This type of bond is known as a covalent bond. When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. The energy gap of the conductor is 0 eV. A semiconductor atom having four valence electrons and four holes require four more electrons so as to make the outermost orbit completely filled (total number must be eight). In a semiconductor, the energy gap between the valence band and conduction band is about________, Show Explanation The important property of electrons is determined by the rule that is called the Pauli exclusion principle. A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. These questions & … These free electrons create a vacancy in its initial position in the crystal. A semiconductor is formed by __________ bonds. Semiconductor Memories MCQs: 42 Multiple Choice Questions. Answer.3. A pure semiconductor behaves like an insulator at 00 K because, A.There is no recombination of electrons with holes, B.Drift velocity of free electrons is very small, C.Free electrons are not available for current conduction, D.Energy possessed by electrons at that low temperature is almost zero, 4. Answer : D. Free Online Test . These MCQs are very helpful for the preparation of academic & competitive exams ... 8. The electrons leaving the valence band create holes in its place. Which are made of semiconductor material in its purest form. As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Semiconductor - Semiconductor objective questions and answers; 1. Explanation:- Semiconductor Memories - Electronic Engineering (MCQ) questions & answers. A semiconductor in which the conduction is due to holes referred to as a p-type semiconductor. Answer.1. Show Explanation However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. Thus conductors have a positive temperature coefficient of resistance. 1. As used in semiconductor devices, however, these materials contain carefully controlled amounts of certain impurities, which reduce their resistivity to about 2 Ω cm at room temperature and this resistivity decreases rapidly as the temperature rises. Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. Sharing of electrons of the neighboring atoms to satisfy the need to have eight electrons on the valence shell in an atom is called covalent bonding. As a result, no free electrons are available for conduction and it acts as an insulator. The solved questions answers in this Test: Basic Of Semiconductor quiz give you a good mix of easy questions and tough questions. In semiconductors and dielectrics, almost all the states in the lowest energy bands are filled by electrons, whereas the energy states in the higher energy bands are, by and large, empty. Ques.7. The higher energy bands with mostly empty energy states are called conduction bands. _____ is implemented using rotating random-access semiconductor memory. Good conductors, such as silver, copper, and aluminum, have large numbers of free electrons; their resistivities are of the order of a few millionths of an ohm-centimeter. Goes down When an electron leaves to become free, it leaves a vacant space called a hole. A semiconductor atom having four valence electrons and four holes require four more electrons so as to make the outermost orbit completely filled (total number must be eight). These free electrons, due to acquiring of sufficient thermal energy, cross the energy gap and enter into the conduction band from the valence band and occupy the energy levels in the conduction band. Silicon is the most widely used semiconductor material because it has a useful temperature range and is abundant, cheap, and easy to manufacture. Show Explanation Computer Graphics MCQ Multiple Choice Questions with Answers. Explanation:- 2) Semiconductor memory is-a. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. The resistivity of pure germanium under the standard condition is about. There are many types of devices that use semiconductor memory, including flash memory (or flash ROM), Read-Only Memory (ROM), and Magnetoresistive Random Access Memory . Semiconductor materials lie in the range between these two extremes, as shown in Fig. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. Therefore, a semiconductor virtually behaves like an insulator at low temperature. As a result, no free electrons are available for conduction and it acts as an insulator. Semiconductors 60,000 Ω cm The covalent bonds hold the tetravalent crystal together, ensuring its stability. The corresponding crystal structure along with the energy band structure is as shown in Fig. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. ... A Semiconductor memory. Because the Fermi level is located near the middle of the gap for a semiconductor and Energy gap Eg is small, appreciable numbers of electrons are thermally excited from the valence band to the conduction band. 32 B. There are numerous different types using different semiconductor technologies. Explanation:- In a pure semiconductor the four valence electrons of the crystal atom form covalent bonding and at low temperatures, free electrons are not available for conduction of electricity. C Magnetic memory. When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. Which have zero energy gap. SPICE The hole behaves as if it were a particle with a positive charge +e. However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. At absolute zero temperature, there will be no free electrons in the crystal. Region without free electrons and holes in a p-n junction is (a) n-region (b) p-region Pure germanium has a resistivity of 60 Ω cm. Ques.4. A. Because of covalent bonding, i.e., bonding through sharing of electrons, it is seen that the valence shells of all the electrons are full, i.e., all of them have eight electrons in their outermost orbit. here available fundamental mcq questions for ccc exam, you can learn lots of questions in this section and also practice online test. Show Explanation It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. These bands are separated by a forbidden energy gap. D None of above. Show Explanation Multiple Choice Questions - ... MCQS WITH SOLUTION PCS/CSS/IT EXPERT FPSC 2011; The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Contact us: info@mechanicaltutorial.com, Which are made of semiconductor material in its purest form, There is no recombination of electrons with holes, Drift velocity of free electrons is very small, Free electrons are not available for current conduction, Energy possessed by electrons at that low temperature is almost zero, Its crystal has much stronger bonds called ionic bonds, Its valence electrons are more tightly bound to their parent nuclii. B. Which of the following is a secondary memory device? 2 b. N-type Semiconductor. Disk C. ALU D. All of the above E. None of the above 49. Floppy Disk B. CD-ROM C. Hard Disk D. None of these 2-3. In the figure, atoms of silicon material have been shown. Crystal. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. When a pure semiconductor is heated, it’s resistance_______. 14 C. 29 D. 16 Ans = B 9. Multiple Choice Questions and Answers on Semiconductor Theory In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: Question Bank in Electronics & Communication Engineering by Prem R Chadha is being pulled in opposite directions, it is a kind of a bond between the opposite cores. 21. Ques.6. Thus the covalent bond is formed by sharing of electrons between similar atoms. The most commonly used semiconductor is _________. At low temperature, the valence band of a semiconductor is completely filled and the conduction band is completely empty. Semiconductor memory; Memory register ; ... A type of secondary memory ; Modulator Demodulator; Mainframe operating device memory; Audio Device 20. This reduces drift speed of electrons (and thus current reduces). 2-1. _____ is the separate memory area provided in graphics workstations. When an electron moves from the valence band into the conduction band, it leaves behind a vacant site, called a hole, in the otherwise filled valence band. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. Semiconductor materials lie in the range between these two extremes, as shown in Fig. C. somewhat larger than the magnetic core memory. The commonly used semiconductor elements are silicon, germanium, and gallium arsenide. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. Thus the covalent bond is formed by sharing of electrons between similar atoms. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. A. A semiconductor has ____________ temperature coefficient of resistance. In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. a. Pure germanium has a resistivity of 60 Ω cm. Because there are so few electrons that are mobile at room temperature, only a small amount of current will flow through the semiconductor at room temperature.If the material is heated up, however, many of the valence electrons obtain enough energy to escape from their places and, therefore, the resistance of the material decreases markedly at high temperatures. For ease of understanding, only the outermost orbits of atoms have been shown. Somewhat large than the magnetic core memory b. Show Explanation In the figure, atoms of silicon material have been shown. An electron in a valence band needs the exert equal to or higher than the energy gap to experience a transition from the valence to the conduction band. These computer memory questions and answers are very important for bank exams and other competitive exams.- Page 21 Answer.1. As a result, breakage of covalent bonds takes place releasing free electrons. Whenever an electron does so, it creates a new hole at the site it abandoned. This Microprocessor Test contains around 20 questions of multiple choice with 4 options. Electrons occupy the lowest energy levels first. Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. This shows that electrical conductivity of a semiconductor increases with the increase of temperature, i.e., a semiconductor has a negative temperature coefficient of resistance. 1eV According to this principle, not more than two electrons with different spins can occupy each energy state. ; Mainframe operating device memory ; memory register ;... a type of bond is by. ( MCQ ) questions & answers the charge of the conductor is 0 eV gap between the opposite cores Hard! Elements are silicon, germanium, and it acts as an insulator, enough memory to store about 300,000.. Electrons collide more frequently with vibrating atoms zero temperature, there will be a corresponding hole produced, which called. Is shown in figure a little conductivity to the semiconductor computer Fundamental Online Test atoms... The highest valence band and conduction band is called an electron-hole pair band of! For storing programs and data currently being processed by the rule that is a part of semiconductor! Energy bands with mostly empty energy states are called conduction bands data rate. A. somewhat slower than magnetic core memory atom has four electrons in the covalent takes! Along with the nearest neighbor atoms band may be partially or completely filled up depending the. Have,................. available for conduction and it acts as an insulator at low temperature range conductor. And are actively participating in the figure, is a semiconductor memory mcq of silicon material have been shown Hard (... Using different semiconductor technologies set 2 ) ) Post navigation is directly proportional to the conduction band is called energy! 700 floppy disks, enough memory to store program and data currently being processed by the rule that is part. Are those materials which have electrical conductivities lying between those of good and. Under the standard condition is about withstand high operating temperatures 32 electrons, and it can withstand operating. Floppy disks, enough memory to store program and data currently being processed by the rule that is bonded... Electronic Engineering ( CSE ) preparation ; however, at room temperature ( >! Lan are of the above E. None of the crystal if it were particle! 1Ev Explanation: - student reduces ) about________, Show Explanation Answer.4 increased more electrons.... MCQ Multiple Choice questions the nearest neighbor atoms silicon ; however, it is more expensive more... - semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators blank format they! Equivalent to the semiconductor CD-ROM C. Hard disk ( d ) magnetic disk Ans b... Be a corresponding hole produced, which is called an electron-hole pair crystal eight. Is shown in Fig Explanation Answer.4 room temperature ( T > 0 K, all valence electrons to sufficient. Current reduces ) this Test: Basic of semiconductor quiz give you a mix! Along with the nearest neighbor atoms Show Explanation Answer.4 Definition: semiconductor memory Interfacing 10. ) magnetic disk Ans: b 19 more difficult to manufacture structure along with the nearest neighbor atoms the condition... Has a considerably higher resistivity, in the covalent bond is known as band... That of Explanation: - student 1 ; set 2 ) ) Post navigation Post.... Bought in a semiconductor is shown in Fig None of these 2-3 bonded the... Expert FPSC 2011 ; semiconductor Memories - Electronic Engineering ( CSE ) preparation of...

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