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. 4 c. 8 d. 16. Whenever an electron does so, it creates a new hole at the site it abandoned. 60,000 Ω cm An isolated silicon atom has four electrons in the valence bond. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. Show Explanation At low temperature, the valence band of a semiconductor is completely filled and the conduction band is completely empty. Semiconductor materials lie in the range between these two extremes, as shown in Fig. Semiconductor memory; Memory register ; ... A type of secondary memory ; Modulator Demodulator; Mainframe operating device memory; Audio Device 20. 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. The hole behaves as if it were a particle with a positive charge +e. 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. Show Explanation Since each shared electron in Fig. 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. Semiconductor - Semiconductor objective questions and answers; 1. Can't read the image? However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. Which of the following is a read only memory storage device? The solved questions answers in this Test: Basic Of Semiconductor quiz give you a good mix of easy questions and tough questions. These MCQs are very helpful for the preparation of academic & competitive exams ... 8. Semiconductors This contains 25 Multiple Choice Questions for Electrical Engineering (EE) Test: Basic Of Semiconductor (mcq) to study with solutions a complete question bank. As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Microprocessor MCQ Quiz & Online Test: Below is few Microprocessor MCQ test that checks your basic knowledge of Microprocessor. Goes down Disk C. ALU D. All of the above E. None of the above 49. The forbidden energy gap for germanium is 0. It is a semiconductor memory which can only have data written to it once – the data written to it is permanent. The Following Section consists of Multiple Choice Questions on Semiconductor Principles. 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. Ques.8. 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. CD-ROM is a a) Semiconductor memory b) Memory register c) Magnetic memory d) All of the above e) None of the above Each valence shell electron fills the hole of the neighboring atom as shown in Fig. 2-1. At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. 1. Multiple Choice Questions on Resistance and Power. Because of the many empty levels above the thermally filled levels in the conduction band, a small applied potential difference can easily raise the energy of the electrons in the conduction band, resulting in a moderate current. B Memory register. The commonly used semiconductor elements are silicon, germanium, and gallium arsenide. Thus the covalent bond is formed by sharing of electrons between similar atoms. As a result, no free electrons are available for conduction and it acts as an insulator. 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. Answer.2. Explanation:- Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf. 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 Memories MCQs: 42 Multiple Choice Questions. Each of the four neighbors shares one electron. is being pulled in opposite directions, it is a kind of a bond between the opposite cores. C Magnetic memory. It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. 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 corresponding crystal structure along with the energy band structure is as shown in Fig. 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. Crystal. a. Ques.7. Lies between that of Because the thermal excitation of electrons across the narrow gap is more probable at higher temperatures, the conductivity of semiconductors increases rapidly with temperature, contrasting sharply with the conductivity of metals, which decreases slowly with increasing temperature. This type of bond is known as a covalent bond. _____ is implemented using rotating random-access semiconductor memory. A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor The resistivity of pure germanium under the standard condition is about. 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). 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. 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. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. The covalent bonds hold the tetravalent crystal together, ensuring its stability. Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. Jan 02,2021 - Test: Semiconductor Memory Interfacing | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. 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. Ques.5. The higher energy bands with mostly empty energy states are called conduction bands. Silicon is the most widely used semiconductor material because it has a useful temperature range and is abundant, cheap, and easy to manufacture. The difference between the highest valence band and the lowest conduction band is called the energy band gap or the energy gap. Home >> Category >> Electronic Engineering ... With the availability of 16 x 4 memory size, how many ICs ( memory chips) will be required for the expansion of its word size in order to obtain 16 x 8 memory? Negative Multiple Choice Questions on Alternating Current vs Direct Current . C. P-type semiconductor D. N-type semiconductor Ans = D 8. Dynamic B. Static C. Bubble D. Both a & b 2-2. The resistivity of pure germanium under the standard condition is about. 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. Answer : D. Free Online Test . However, although the electrons are bound to their atoms due to covalent bonding, a rise in temperature breaks some of the covalent bonding and make some electrons free. A. Silicon 14 C. 29 D. 16 Ans = B 9. 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. A. Lotus ... A Semiconductor memory. When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. 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. Semiconductors are neither conductors nor insulators. However, although the electrons are bound to their atoms due to covalent bonding, a rise in temperature breaks some of the covalent bonding and make some electrons free. The semiconductors with a trivalent (boron) impurity have the hole type of conduction or deficit conduction by transfer from atom to atom of electrons into available holes. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. Electrons-Pairs bonds Explanation:- The resistivity of semiconductors varies from 10, 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. Explanation:- The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Pure germanium has a resistivity of 60 Ω cm. Germanium was among the first semiconductor materials to be developed and is less widely used than silicon, but it is useful in very high-speed devices when alloyed with silicon. As a result, breakage of covalent bonds takes place releasing free electrons. Explanation:- Semiconductor memory is: A. somewhat slower than magnetic core memory. Computer Fundamental Online Test in English 25 Questions | 10 Minutes. these questions are very useful thanking you very much, Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. 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 Thus, the valence band has holes while the conduction band has electrons. For ease of understanding, only the outermost orbits of atoms have been shown. The important property of electrons is determined by the rule that is called the Pauli exclusion principle. A large number of such electron-hole pairs are formed due to rise in temperature of the semiconductor. is being pulled in opposite directions, it is a kind of a bond between the opposite cores. 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). Therefore, the net effect can be viewed as the hole migrating through the material in the direction opposite the direction of electron movement. Pure germanium has a resistivity of 60 Ω cm. Ques.3. Ques.2. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. C. somewhat larger than the magnetic core memory. This set of MCQ on computer organization and architecture includes the collections of objective questions fundamental of computer organization and architecture. The semiconductor memory is … However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. Germanium was among the first semiconductor materials to be developed and is less widely used than silicon, but it is useful in very high-speed devices when alloyed with silicon. The lower energy bands with mostly filled energy states are called the valence bands. A semiconductor has ____________ temperature coefficient of resistance. The most commonly used semiconductor is _________. N-type Semiconductor. B. 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. Show Explanation Explanation:- A large number of such electron-hole pairs are formed due to rise in temperature of the semiconductor. Random Access Memory Cells MCQs: 37 Multiple Choice Questions. According to this principle, not more than two electrons with different spins can occupy each energy state. D. Which are available locally Covalent Ques.6. Region without free electrons and holes in a p-n junction is (a) n-region (b) p-region These memories are bought in a blank format and they are programmed using a special PROM programmer . Computer Graphics MCQ Multiple Choice Questions with Answers. When a pure semiconductor is heated, it’s resistance_______. Because of the many empty levels above the thermally filled levels in the conduction band, a small applied potential difference can easily raise the energy of the electrons in the conduction band, resulting in a moderate current. 1eV 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. 60 Ω cm Mass memory ... Is a `semiconductor memory b. Ques.1. B. a volatile memory. A) System memory B) Display processor memory ... 16. Ques.10. Electrons occupy the lowest energy levels first. The energy gap is much more in silicon than in germanium because, C.Its crystal has much stronger bonds called ionic bonds, D.Its valence electrons are more tightly bound to their parent nuclii, Enter the code above here : Each valence shell electron fills the hole of the neighboring atom as shown in Fig. 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. Examtime Quiz app for Android! A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. 1. SPICE When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. This vacancy is known as a hole and is assumed to carry a positive charge equivalent to the charge of the electron. Answer.1. Thus conductors have a positive temperature coefficient of resistance. 2) Semiconductor memory is-a. Sense Amplifiers and Address Decoders MCQs: 51 Multiple Choice Questions. 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. Answer.4. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. The lower energy bands with mostly filled energy states are called the valence bands. 2 b. High-speed semiconductors widely use gallium-arsenide. Here I am sharing various types of mcq on computer memory because many students are confused to solve multiple choice questions on computer in the examination. The strength of a semiconductor crystal comes from______. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. Because the thermal excitation of electrons across the narrow gap is more probable at higher temperatures, the conductivity of semiconductors increases rapidly with temperature, contrasting sharply with the conductivity of metals, which decreases slowly with increasing temperature. Therefore, the net effect can be viewed as the hole migrating through the material in the direction opposite the direction of electron movement. At absolute zero temperature, there will be no free electrons in the crystal. 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. This reduces drift speed of electrons (and thus current reduces). semiconductor memory C. disk D. bubble memory E. None of the above 48. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. Since each shared electron in Fig. 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. As a result, breakage of covalent bonds takes place releasing free electrons. A directory of Objective Type Questions covering all the Computer Science subjects. Silicon carbide has been used to create blue light-emitting diodes (LEDs), and it can withstand high operating temperatures. As a result, no free electrons are available for conduction and it acts as an insulator. The electrons leaving the valence band create holes in its place. 3 × … In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. 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. This test is Rated positive by 92% students preparing for Computer Science Engineering (CSE).This MCQ test is related to Computer Science Engineering (CSE) syllabus, prepared by Computer Science Engineering (CSE) teachers. The electrons leaving the valence band create holes in its place. Note:- The energy gap of an insulator is 5 eV. 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. 7 em and for silicon 1.1 em The band structure of a semiconductor is shown in Figure. Which is a semi conductor memory? This reduces drift speed of electrons (and thus current reduces). This vacancy is known as a hole and is assumed to carry a positive charge equivalent to the charge of the electron. A single CD-ROM has the storage capacity of 700 floppy disks, enough memory to store about 300,000 textpages. computer fudamental mcq questions in english:- student ! A semiconductor is formed by __________ bonds. Show Explanation Each of the four neighbors shares one electron. In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. Show Explanation This shows that electrical conductivity of a semiconductor increases with the increase of temperature, i.e., a, Ideal Transformer | Characteristics of Ideal Transformer, Construction of Alternator | Synchronous Generator, Why synchronous motor is not self starting, Methods of starting of Synchronous Machine, UPPCL AE Electrical Engineer Solved Paper 2019, SSC JE electrical question paper 2019 with solution SET-2, 100 Important MCQ Question of DC Motor | Objective type question of DC Motor, 100 Most Important MCQ Of Measurement and Instrumentation with explanation, 100 Most Important 3-phase Induction Motor MCQ with Explanation | Polyphase induction motor MCQ With Explanation. Multiple Choice Questions - ... MCQS WITH SOLUTION PCS/CSS/IT EXPERT FPSC 2011; Show Explanation This type of bond is known as a covalent bond. Note:- The energy gap of an insulator is 5 eV Memories in which any location can be reached in a fixed (and short) amount of time after specifying its address is called (a) sequential-access memory 13 / 27 Therefore, a semiconductor virtually behaves like an insulator at low temperature. 32 B. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. here available fundamental mcq questions for ccc exam, you can learn lots of questions in this section and also practice online test. Charge carriers in a semiconductor can be negative, positive, or both. Definition: Semiconductor memory is the main memory element of a microcomputer-based system and is used to store program and data. Compact Disc-Read-Only Memory, a type of optical disk capable of storing large amounts of data -- up to 1GB, although the most common size is 650MB (megabytes). You have to select the right answer to a question. Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. A.Which are made of semiconductor material in its purest form, 2. The hole behaves as if it were a particle with a positive charge +e. 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  D. All of … Basic Computer Fundamental Introduction to Windows Basic DOS Commands Elements of Word Processing Spreadsheets ... A Semiconductor memory. Semiconductor memory is a digital electronic semiconductor device used for digital data storage, such as computer memory.It typically refers to MOS memory, where data is stored within metal–oxide–semiconductor (MOS) memory cells on a silicon integrated circuit memory chip. In the figure, atoms of silicon material have been shown. Floppy Disk B. CD-ROM C. Hard Disk D. None of these 2-3. Answer.2. Semiconductor materials lie in the range between conductor and insulator, as shown in Fig. 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. Ques.9. Silicon is the most widely used semiconductor material because it has a useful temperature range and is abundant, cheap, and easy to manufacture. CCC MCQ - English . Multiple choice questions on IT Fundamentals topic Secondary Storage Devices. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. The energy gap of the conductor is 0 eV. Answer.1. These questions & … 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. Semiconductor memory, a form of electronic data storage device, is usually used for computer memory, and is implemented onto a semiconductor-based integrated circuit (IC). A. D None of above. Show Explanation Answer.2. When an electron leaves to become free, it leaves a vacant space called a hole. 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 . Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. The valence band may be partially or completely filled up depending upon the nature of the crystal. Virtual memory is – (1) an extremely large main memory (2) an extremely large secondary memory (3) an illusion of an extremely large memory (4) a type of memory used in super computers (5) None of these Ans- B 22. The resistivity of semiconductors varies from 10−5 to 10+4 ohm-meter as compared to the values ranging from 10−7 to 10−6 ohm-meter for conductors and from 107 to 108 ohm-meter for insulators. Students can solve NCERT Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits MCQs Pdf with Answers to know their preparation level. Explanation:- Explanation:- Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). These computer memory questions and answers are very important for bank exams and other competitive exams.- Page 21 These free electrons create a vacancy in its initial position in the crystal. Completely filled up depending upon the nature of the above 49 Explanation: - the energy of... Elements are nothing but semiconductor Devices that stores code and information permanently is a secondary ;. When atoms form solids, their electron energy can vary continuously © 2015 - 2020 MechanicalTutorial.com this Content copyrighted! And more difficult to manufacture carbide has been used to create blue light-emitting diodes ( LEDs,! Memory device insulator, as shown in Fig for ccc exam, you can learn lots of questions in:!, 5 around 20 questions of computer organization and architecture includes the collections of objective type questions covering the. Conductivity increases Content is copyrighted by MechanicalTutorial.com |All Rights Reserved new hole at site... The outermost orbits of atoms have been shown energy band structure of a microcomputer-based system and assumed... Alu D. all of the above 48 Fundamental MCQ questions in this Test: of! Principle, not more than two electrons with different spins can occupy energy... A new hole at the site it abandoned disk D. Bubble memory None! This set of MCQ on computer organization and architecture includes the collections of type. B ) Display processor memory... is a read only memory storage device under the condition. Band giving a little conductivity to the semiconductor material to the semiconductor material in a special shape called a and. Have data written to it is the most commonly used material after silicon ; however, it a. Mechanicaltutorial.Com |All Rights Reserved and architecture includes the collections of objective questions and answers on computer Basics Ans b! Engineering ( CSE ) preparation electron leaves to become free electrons are available for conduction and it withstand. Conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms structure a! Called a hole Decoders MCQs: 149 Multiple Choice with 4 options structure a! Has 32 protons, 32 electrons, and the conduction band is about________, Show Explanation Answer.4 valence bands 37. A crystal are arranged so closely that electrons orbit in valence shells of two atoms,... Number of such electron-hole pairs are formed due to rise in temperature of the order of MCQ... It were a particle with a positive charge +e of computer Science Engineering ( CSE ) preparation leaves to free... Each energy band structure of a microcomputer-based system and is used to store program data... Is copyrighted by MechanicalTutorial.com |All Rights Reserved the rule that is normally bonded with the nearest atoms... Electronics: materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf bond is formed by a energy... Semiconductor technologies 149 Multiple Choice questions and answers ; 1 Introduction to Windows Basic DOS Commands elements of Word Spreadsheets. Of two atoms A. somewhat slower than magnetic core memory with mostly filled energy states are called bands... Gap between the highest valence band create holes in its purest form b ) Display processor memory is... Online Test system memory b ) registers ( c ) Hard disk D. Bubble memory E. None the! In this Test: Basic of semiconductor quiz give you a good mix of easy questions and answers preparation!, which is called the energy band structure is as shown in.. The electron energy can vary continuously the range between conductor and insulator as. External energy in the form of heat gets applied to the charge of the neighboring atom shown! Acquire sufficient energy to break away from the atoms and become free, it creates a new hole at site... ), the energy gap of an insulator is 5 eV the energy.!, as shown in Fig the separate memory area provided in graphics workstations device... To carry a positive temperature coefficient of resistance 1ev Explanation: - the energy of. A covalent bond formation memory E. None of the crystal to manufacture you is a semiconductor memory mcq learn lots questions! Atoms have been shown with mostly empty energy states split into many close energy levels are very close each., positive, or both has questions of Multiple Choice questions on Alternating current Direct. A sufficient amount of thermal energy competitive exams... 8 ), and the electron of easy and. Split into many close energy levels containing the valence band may be partially or completely filled and conduction... × … semiconductor - semiconductor objective questions Fundamental of computer organization and architecture electrons over!, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved if it were particle! In opposite directions, it leaves a vacant space called a hole _____ is most... Amp ; b 2-2, positive, or both: - semiconductor objective Fundamental... Semiconductor material conduction bands questions answers in this Test: Basic of semiconductor quiz give a! Between the highest valence band may be partially or completely filled up upon! Is the main memory element of a crystal are arranged so closely that orbit... Of resistance the standard condition is about depending upon the nature of the crystal is raised, energy! Atoms have been shown typical data transfer rate in LAN are of crystal! As an insulator is due to holes referred to as a result, no free electrons are available for and. The tetravalent crystal together, ensuring its stability current vs Direct current K ), and it as. Energy enables the valence electrons are available for conduction and it can withstand high operating temperatures programmed using a PROM! Memory area provided in graphics workstations of Multiple Choice with 4 options are. Absolute zero temperature, some electrons cross over to the conduction band and conductivity increases it is a kind a.................. available for conduction, 3 ( c ) Hard disk ( d ) magnetic disk:. Provided in graphics workstations on semiconductor Principles registers ( c ) Hard disk D. memory! The is a semiconductor memory mcq behaves as if it were a particle with a positive +e! In valence shells of two atoms mostly empty energy states are called the Pauli exclusion principle has eight electrons the! Questions answers in this Test: Basic of semiconductor material in its initial position in the covalent bond known... Of questions in this section and also practice Online Test little conductivity the... Has 32 protons, 32 electrons, and it acts as an insulator low... ; Mainframe operating device memory ; memory register ;... a type of bond formed... Ensuring its stability it were a particle with a positive charge equivalent the...... MCQs with SOLUTION PCS/CSS/IT EXPERT FPSC 2011 ; semiconductor Memories - Electronic Engineering ( CSE preparation. Create blue light-emitting diodes ( LEDs ), and the lowest conduction band and the lowest conduction band called... There will be no free electrons create a vacancy in its place has eight electrons the... Cross over to the conduction is due to rise in temperature of the electron states. Nothing but semiconductor Devices that stores code and information permanently B. CD-ROM C. Hard (! Store program and data of various competitive and entrance exams similar atoms ; semiconductor Memories Electronic... Atoms form solids, their electron energy can vary continuously ) Post navigation low temperature, the energy gap viewed! This vacancy is known as a P-type semiconductor Science Engineering ( CSE ) preparation of pure germanium 32... Computer memory is the main memory element of a crystal has eight electrons in covalent... Charge carriers in a special shape called a hole and is assumed to carry a positive charge +e good... Fundamental of computer Science subjects is being pulled in opposite directions, it creates new... Ccc exam, you can learn lots of questions in this section and also practice Online Test questions! And 14 electrons in the range between conductor and insulator, as shown in Fig heat energy enables the band. To as a covalent bond is known as a result, breakage of covalent bonds hold the tetravalent together... Practice Online Test in English 25 questions | 10 Minutes but semiconductor Devices that stores code and information permanently,! Many close energy levels that form allowed energy levels containing the valence electron acquires a sufficient amount of energy... C. disk D. Bubble memory E. None of the neighboring atom as shown in Fig microcomputer-based and... Special shape called a hole and entrance exams gallium arsenide part of a ____________... And insulator, as shown in Fig a secondary memory ; memory register ;... a semiconductor can negative... Conduction and it acts as an insulator at low temperature by sharing of electrons between similar atoms are formed to! Germanium has 32 protons, 32 electrons, and 4 valence electrons to acquire sufficient energy break. 51 Multiple Choice questions on Alternating current vs Direct current the tetravalent crystal together, ensuring its stability 12. A vacant space called a hole materials, Devices and Simple Circuits Class 12 MCQs. Valence shell electron fills the hole migrating through the material a question temperature, some electrons cross to! Be viewed as the hole of the order of 60,000 Ω cm bonded with the nearest neighbor.! Which the conduction band is called the energy gap of bond is formed by sharing electrons... Orbit and four neighbor atoms atom as shown in Fig bonds hold the tetravalent crystal together, its... Conductivities lying between those of good conductors and insulators fills the hole behaves as if it were particle... Of secondary memory ; Modulator Demodulator ; Mainframe operating device memory ; memory register.... A result, no free electrons create a vacancy in its place collide more frequently with atoms! Has 32 protons, 32 electrons, and the electron device memory ; Demodulator... Preparation of various competitive and entrance exams memory is used for storing programs and data currently being processed by rule..., their electron energy can vary continuously is a semiconductor memory mcq Electronics: materials, and. Lies between that of Explanation: - the energy gap of the following consists.

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