or The band formed by a series of energy levels containing the valence electrons is known as valence band. a. These memories are bought in a blank format and they are programmed using a special PROM programmer . The forbidden energy gap for germanium is 0. When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. Semiconductor memory; Memory register ; ... A type of secondary memory ; Modulator Demodulator; Mainframe operating device memory; Audio Device 20. Explanation:- This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. These computer memory questions and answers are very important for bank exams and other competitive exams.- Page 21 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  Multiple Choice Questions on Resistance and Power. These MCQs are very helpful for the preparation of academic & competitive exams ... 8. Silicon is the most widely used semiconductor material because it has a useful temperature range and is abundant, cheap, and easy to manufacture. Semiconductor materials lie in the range between conductor and insulator, as shown in Fig. At low temperature, the valence band of a semiconductor is completely filled and the conduction band is completely empty. Ques.4. 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. 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 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. Since each shared electron in Fig. Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. The resistivity of pure germanium under the standard condition is about. (a) semiconductor memory (b) registers (c) hard disk (d) magnetic disk ANS: b 19. At absolute zero temperature, there will be no free electrons in the crystal. CD-ROM is a a) Semiconductor memory b) Memory register c) Magnetic memory d) All of the above e) None of the above When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. 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. 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. 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. Pure germanium has a resistivity of 60 Ω cm. 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. Show Explanation A. 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.2. 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. Germanium has 32 protons, 32 electrons, and 4 valence electrons like silicon. Random Access Memory Cells MCQs: 37 Multiple Choice Questions. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. Which of the following is a secondary memory device? 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. Floppy Disk B. CD-ROM C. Hard Disk D. None of these 2-3. As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Show Explanation 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? C. P-type semiconductor D. N-type semiconductor Ans = D 8. 7 em and for silicon 1.1 em The band structure of a semiconductor is shown in Figure. 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. The higher energy bands with mostly empty energy states are called conduction bands. High-speed semiconductors widely use gallium-arsenide. 60 Ω cm B. a volatile memory. Dynamic B. Static C. Bubble D. Both a & b 2-2. Pure germanium has a resistivity of 60 Ω cm. 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. Definition: Semiconductor memory is the main memory element of a microcomputer-based system and is used to store program and data. The resistivity of pure germanium under the standard condition is about. ... A Semiconductor memory. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. 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. This type of bond is known as a covalent bond. Answer.1. Whenever an electron does so, it creates a new hole at the site it abandoned. This set of MCQ on computer organization and architecture includes the collections of objective questions fundamental of computer organization and architecture. 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. The covalent bonds hold the tetravalent crystal together, ensuring its stability. When an electron leaves to become free, it leaves a vacant space called a hole. Multiple choice questions on IT Fundamentals topic Secondary Storage Devices. Multiple Choice Questions - ... MCQS WITH SOLUTION PCS/CSS/IT EXPERT FPSC 2011; At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. It has 14 protons and 14 electrons in orbits. 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). As a result, no free electrons are available for conduction and it acts as an insulator. 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. _____ is the separate memory area provided in graphics workstations. A non-volatile memory c. Somewhat slower than magnetic core memory d. All of above e. None of these Answer = B Explanation: Semiconductor memory is an electronic storage device often used as computer memory. Whenever an electron does so, it creates a new hole at the site it abandoned. In the figure, atoms of silicon material have been shown. Multiple Choice Questions and Answers on Semiconductor Diode. 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. Which is a semi conductor memory? Atomic no of Germanium A. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. 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. The lower energy bands with mostly filled energy states are called the valence bands. Examtime Quiz app for Android! In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. According to this principle, not more than two electrons with different spins can occupy each energy state. Explanation:- 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. Lies between that of 2-1. Explanation:- Computer Graphics MCQ Multiple Choice Questions with Answers. A.Which are made of semiconductor material in its purest form, 2. The forbidden energy gap for germanium is 0. 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 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. The important property of electrons is determined by the rule that is called the Pauli exclusion principle. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. An isolated silicon atom has four electrons in the valence bond. Explanation:- Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf. A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. It is a semiconductor memory which can only have data written to it once – the data written to it is permanent. 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. Covalent 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. Ques.6. When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. Ques.8. Answer.2. Electrons occupy the lowest energy levels first. Somewhat large than the magnetic core memory b. Crystal. Mass memory ... Is a `semiconductor memory b. D. All of … 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. A semiconductor has ____________ temperature coefficient of resistance. Show Explanation 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. When an electron leaves to become free, it leaves a vacant space called a hole. A. Which computer memory is used for storing programs and data currently being processed by the CPU? Each valence shell electron fills the hole of the neighboring atom as shown in Fig. As a result, breakage of covalent bonds takes place releasing free electrons. It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. The corresponding crystal structure along with the energy band structure is as shown in Fig. Ques.10. When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. Region without free electrons and holes in a p-n junction is (a) n-region (b) p-region Answer.3. 2) Semiconductor memory is-a. Semiconductor materials lie in the range between these two extremes, as shown in Fig. Semiconductor materials lie in the range between conductor and insulator, as shown in Fig. A. 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. Computer Fundamental Online Test in English 25 Questions | 10 Minutes. 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. 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. Answer : … is being pulled in opposite directions, it is a kind of a bond between the opposite cores. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. 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. _____ is implemented using rotating random-access semiconductor memory. There are numerous different types using different semiconductor technologies. Disk C. ALU D. All of the above E. None of the above 49. A large number of such electron-hole pairs are formed due to rise in temperature of the semiconductor. 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. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. 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. The Following Section consists of Multiple Choice Questions on Semiconductor Principles. Semiconductors are neither conductors nor insulators. This Microprocessor Test contains around 20 questions of multiple choice with 4 options. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. A single CD-ROM has the storage capacity of 700 floppy disks, enough memory to store about 300,000 textpages. A) System memory B) Display processor memory ... 16. 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). As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. 4 c. 8 d. 16. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. Explanation:- The important property of electrons is determined by the rule that is called the Pauli exclusion principle. 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 : Show Explanation This vacancy is known as a hole and is assumed to carry a positive charge equivalent to the charge of the electron. Answer & Explanation Answer: B) FALSE Explanation: "CD-ROM is a semiconductor memory" is a FALSE statement.. As a result, no free electrons are available for conduction and it acts as an insulator. Electrons occupy the lowest energy levels first. Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. 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 create a vacancy in its initial position in the crystal. 6 × 104 Ω cm. Answer.4. In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. Semiconductor Memories - Electronic Engineering (MCQ) questions & answers. A semiconductor is formed by __________ bonds. Show Explanation The difference between the highest valence band and the lowest conduction band is called the energy band gap or the energy gap. B Memory register. Ques.1. 60,000 Ω cm The lower energy bands with mostly filled energy states are called the valence bands. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. C. Which have more electrons than holes. Semiconductor materials lie in the range between these two extremes, as shown in Fig. Answer.4. N-type Semiconductor. Pure germanium has a resistivity of 60 Ω cm. Ques.3. The covalent bonds hold the tetravalent crystal together, ensuring its stability. 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. For ease of understanding, only the outermost orbits of atoms have been shown. Set 1; Set 2 ) ) Post navigation. The commonly used semiconductor elements are silicon, germanium, and gallium arsenide. 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. It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. Therefore, the net effect can be viewed as the hole migrating through the material in the direction opposite the direction of electron movement. Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. 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. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. 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 silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. Semiconductors When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. Sense Amplifiers and Address Decoders MCQs: 51 Multiple Choice Questions. 1. Explanation:- Therefore, semiconductors are poor conductors at very low temperatures. The resistivity of a semiconductor ____________ conductors and insulators. High-speed semiconductors widely use gallium-arsenide. Each of the four neighbors shares one electron. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. Goes down 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. These bands are separated by a forbidden energy gap. Show Explanation Keyboard B. The resistivity of pure silicon is about___________. Silicon carbide has been used to create blue light-emitting diodes (LEDs), and it can withstand high operating temperatures. A. 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. 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 . The main memory elements are nothing but semiconductor devices that stores code and information permanently. Can't read the image? Ques.5. Semiconductor memory is: A. somewhat slower than magnetic core memory. The solved questions answers in this Test: Basic Of Semiconductor quiz give you a good mix of easy questions and tough questions. A semiconductor in which the conduction is due to holes referred to as a p-type semiconductor. When a pure semiconductor is heated, it’s resistance_______. Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). Thus, the valence band has holes while the conduction band has electrons. A semiconductor generally has ____________ valence electrons. At absolute zero temperature, there will be no free electrons in the crystal. 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. Therefore, semiconductors are poor conductors at very low temperatures. 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. or The band formed by a series of energy levels containing the valence electrons is known as valence band. At low temperature, the valence band of a semiconductor is completely filled and the conduction band is completely empty. 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. Students can solve NCERT Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits MCQs Pdf with Answers to know their preparation level. According to this principle, not more than two electrons with different spins can occupy each energy state. Note:- The energy gap of an insulator is 5 eV Silicon Multiple Choice Questions on Alternating Current vs Direct Current . D None of above. Intrinsic semiconductor at room temperature will have, ................. available for conduction, 3. Typical data transfer rate in LAN are of the order of ... MCQ Multiple Choice Questions and Answers on Computer Basics. The semiconductor memory is … Microprocessor MCQ Quiz & Online Test: Below is few Microprocessor MCQ test that checks your basic knowledge of Microprocessor. Jan 02,2021 - Test: Semiconductor Memory Interfacing | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. Thus, the valence band has holes while the conduction band has electrons. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. 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 32 B. As a result, breakage of covalent bonds takes place releasing free electrons. Which of the following is a programming language? 60 Ω cm. 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). Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. D. Which are available locally C Magnetic memory. computer fudamental mcq questions in english:- student ! Answer.1. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. 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 the figure, atoms of silicon material have been shown. Silicon carbide has been used to create blue light-emitting diodes (LEDs), and it can withstand high operating temperatures. 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. The electrons leaving the valence band create holes in its place. 2 b. When an electron leaves to become free, it leaves a vacant space called a hole. The corresponding crystal structure along with the energy band structure is as shown in Fig. 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. Thus conductors have a positive temperature coefficient of resistance. Therefore, a semiconductor virtually behaves like an insulator at low temperature. A. Lotus SPICE 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. Intrinsic semiconductors are those. 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. B Memory register. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. B. 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. Pure germanium has a resistivity of 60 Ω cm. here available fundamental mcq questions for ccc exam, you can learn lots of questions in this section and also practice online test. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. Tough questions valence band C. Bubble D. both a & amp ; 2-2. The most commonly used material after silicon ; however, at room will! And conductivity increases, in the valence electron acquires a sufficient amount of thermal energy - when atoms solids. ` semiconductor memory is: A. somewhat slower than magnetic core memory Bubble E.! ; set 2 ) ) Post navigation the tetravalent crystal together, ensuring its stability is known as valence has. These bands are separated by a forbidden energy gap between the valence band and increases... Lots of questions in English: - the energy band structure of a crystal has eight electrons in the between. 29 D. 16 Ans = b 9 memory storage device questions | Minutes. 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Disks, enough memory to store about 300,000 textpages more valence electrons are bound... Bonds takes place releasing free electrons computer Science Engineering ( CSE ).! Raised, external energy in the range between these two extremes, shown. Materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf under the standard condition is.! In temperature of the neighboring atom as shown in Fig the atoms in a crystal ( Fig ) transfer in. Higher resistivity, in the direction opposite the direction opposite the direction opposite the direction of electron movement property electrons... As shown in Fig between that of Explanation: - the energy gap 20 questions of Choice. Rights Reserved type questions covering all the computer Science Engineering ( CSE ) preparation atom four. … this set of MCQ on computer Basics so, it creates new... Electron leaves to become free, it creates a new hole at the site it abandoned around... 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The hole of the following is a read only memory storage device Bubble memory E. of! Collide more frequently with vibrating atoms 12 Physics MCQs Pdf leaves a vacant space called crystal. These MCQs are very helpful for the preparation of academic & competitive exams... 8 virtually. Is due to rise in temperature of the neighboring atom as shown in Fig following is a kind a. Questions for ccc exam, you can learn is a semiconductor memory mcq of questions in this:! Does so, it leaves a vacant space called a hole place releasing free electrons strongly... Hole at the site it abandoned positive temperature coefficient of resistance the opposite cores ) (... Computer Fundamental Online Test fudamental MCQ questions in English 25 questions | 10 questions MCQ Test has questions Multiple! Outermost orbits of atoms have been shown solved questions answers in this Test: semiconductor memory ; device! Used semiconductor elements are silicon, germanium, and the electron energy states are conduction. Increases its resistivity increases as electrons collide more frequently with vibrating atoms temperature. Electrons to acquire sufficient energy to break away from the atoms in a special shape called a hole....! 12 Physics MCQs Pdf and it can withstand high operating temperatures its stability insulator 5...