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 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. Multiple Choice Questions - ... MCQS WITH SOLUTION PCS/CSS/IT EXPERT FPSC 2011; Each valence shell electron fills the hole of the neighboring atom as shown in Fig. Show Explanation Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. When an electron leaves to become free, it leaves a vacant space called a hole. These MCQs are very helpful for the preparation of academic & competitive exams ... 8. 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. Ques.9. Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). 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). This Microprocessor Test contains around 20 questions of multiple choice with 4 options. Silicon is the most widely used semiconductor material. When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. SPICE Covalent 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. 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. Jan 02,2021 - Test: Semiconductor Memory Interfacing | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. A semiconductor in which the conduction is due to holes referred to as a p-type semiconductor. The lower energy bands with mostly filled energy states are called the valence bands. 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. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. 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. These free electrons create a vacancy in its initial position in the crystal. Semiconductor materials lie in the range between these two extremes, as shown in Fig. Each of the four neighbors shares one electron. Explanation:- D None of above. Silicon is the most widely used semiconductor material because it has a useful temperature range and is abundant, cheap, and easy to manufacture. This set of MCQ on computer organization and architecture includes the collections of objective questions fundamental of computer organization and architecture. Answer.4. The lower energy bands with mostly filled energy states are called the valence bands. 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. Semiconductor Memories MCQs: 42 Multiple Choice Questions. is being pulled in opposite directions, it is a kind of a bond between the opposite cores. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. 1eV semiconductor memory C. disk D. bubble memory E. None of the above 48. Therefore, semiconductors are poor conductors at very low temperatures. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. A semiconductor is formed by __________ bonds. 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. A. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. Since each shared electron in Fig. The covalent bonds hold the tetravalent crystal together, ensuring its stability. or The band formed by a series of energy levels containing the valence electrons is known as valence band. Negative As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor Note:- The energy gap of an insulator is 5 eV. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. Multiple Choice Questions and Answers on Semiconductor Diode. 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. Goes down At low temperature, the valence band of a semiconductor is completely filled and the conduction band is completely empty. Show Explanation 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. The resistivity of a semiconductor ____________ conductors and insulators. Pure germanium has a resistivity of 60 Ω cm. 2-1. 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). Germanium has 32 protons, 32 electrons, and 4 valence electrons like silicon. For ease of understanding, only the outermost orbits of atoms have been shown. This type of bond is known as a covalent bond. These computer memory questions and answers are very important for bank exams and other competitive exams.- Page 21 Show Explanation 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. These bands are separated by a forbidden energy gap. (a) semiconductor memory (b) registers (c) hard disk (d) magnetic disk ANS: b 19. A. 60 Ω cm. 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. The commonly used semiconductor elements are silicon, germanium, and gallium arsenide. Answer.1. Floppy Disk B. CD-ROM C. Hard Disk D. None of these 2-3. B Memory register. In the figure, atoms of silicon material have been shown. Explanation:- Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. When an electron leaves to become free, it leaves a vacant space called a hole. A semiconductor has ____________ temperature coefficient of resistance. Semiconductors are neither conductors nor insulators. Each of the four neighbors shares one electron. Ques.5. Lies between that of 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. Silicon Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. These bands are separated by a forbidden energy gap. It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. Answer : D. Free Online Test . C Magnetic memory. Which of the following is a secondary memory device? This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. Ques.10. 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). Dynamic B. Static C. Bubble D. Both a & b 2-2. Charge carriers in a semiconductor can be negative, positive, or both. At absolute zero temperature, there will be no free electrons in the crystal. Somewhat large than the magnetic core memory b. Therefore, a semiconductor virtually behaves like an insulator at low temperature. D None of above. _____ is implemented using rotating random-access semiconductor memory. Crystal. 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 valence band may be partially or completely filled up depending upon the nature of the crystal. As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Whenever an electron does so, it creates a new hole at the site it abandoned. 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 corresponding crystal structure along with the energy band structure is as shown in Fig. 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. Which computer memory is used for storing programs and data currently being processed by the CPU? 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. Keyboard B. Semiconductor materials lie in the range between these two extremes, as shown in Fig. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. Read Only Memory ROM MCQs: 149 Multiple Choice Questions. Semiconductors High-speed semiconductors widely use gallium-arsenide. 2 b. 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. You have to select the right answer to a question. The covalent bonds hold the tetravalent crystal together, ensuring its stability. 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. or The band formed by a series of energy levels containing the valence electrons is known as valence band. Answer.1. When an electron leaves to become free, it leaves a vacant space called a hole. 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. The corresponding crystal structure along with the energy band structure is as shown in Fig. 60,000 Ω cm Ques.4. Which of the following is a programming language? The resistivity of pure silicon is about___________. Explanation:- a. The hole behaves as if it were a particle with a positive charge +e. Which of the following is a read only memory storage device? As a result, no free electrons are available for conduction and it acts as an insulator. 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. 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. Which is a semi conductor memory? Typical data transfer rate in LAN are of the order of ... MCQ Multiple Choice Questions and Answers on Computer Basics. Thus the covalent bond is formed by sharing of electrons between similar atoms. 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. When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. Show Explanation For ease of understanding, only the outermost orbits of atoms have been shown. Check important MCQs (with answers) for CBSE 12th Physics Board Exam 2020 (Chapter 13, Semiconductor Electronics: Material, Devices & Simple Circuits). 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. 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. These questions & … Answer.3. 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. It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. Answer.2. Thus, the valence band has holes while the conduction band has electrons. Electrons occupy the lowest energy levels first. 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. Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. Basic Computer Fundamental Introduction to Windows Basic DOS Commands Elements of Word Processing Spreadsheets ... A Semiconductor memory. This reduces drift speed of electrons (and thus current reduces). Ques.3. A semiconductor generally has ____________ valence electrons. 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 D. Which are available locally The strength of a semiconductor crystal comes from______. Ques.1. According to this principle, not more than two electrons with different spins can occupy each energy state. At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. The electrons leaving the valence band create holes in its place. Semiconductor memory is: A. somewhat slower than magnetic core memory. Explanation:- As a result, no free electrons are available for conduction and it acts as an insulator. Answer.2. is being pulled in opposite directions, it is a kind of a bond between the opposite cores. 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. Thus conductors have a positive temperature coefficient of resistance. Show Explanation 6 × 104 Ω cm. When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. 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. Semiconductor materials lie in the range between conductor and insulator, as shown in Fig. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. Set 1; Set 2 ) ) Post navigation. 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. Explanation:- Ques.6. 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? A large number of such electron-hole pairs are formed due to rise in temperature of the semiconductor. Disk C. ALU D. All of the above E. None of the above 49. Ques.2. Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. Show Explanation 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. 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). There are numerous different types using different semiconductor technologies. 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. 1. Which have zero energy gap. Pure germanium has a resistivity of 60 Ω cm. _____ is the separate memory area provided in graphics workstations. In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf. Intrinsic semiconductors are those. Silicon carbide has been used to create blue light-emitting diodes (LEDs), and it can withstand high operating temperatures. Thus the covalent bond is formed by sharing of electrons between similar atoms. This type of bond is known as a covalent bond. Pure germanium has a resistivity of 60 Ω cm. This reduces drift speed of electrons (and thus current reduces). Whenever an electron does so, it creates a new hole at the site it abandoned. computer fudamental mcq questions in english:- student ! B. a volatile memory. 14 C. 29 D. 16 Ans = B 9. The valence band may be partially or completely filled up depending upon the nature of the crystal. This vacancy is known as a hole and is assumed to carry a positive charge equivalent to the charge of the electron. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. This vacancy is known as a hole and is assumed to carry a positive charge equivalent to the charge of the electron. A. Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. A directory of Objective Type Questions covering all the Computer Science subjects. Which are made of semiconductor material in its purest form. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. Intrinsic semiconductor at room temperature will have, ................. available for conduction, 3. Explanation:- Semiconductor - Semiconductor objective questions and answers; 1. Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. The important property of electrons is determined by the rule that is called the Pauli exclusion principle. N-type Semiconductor. As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. As a result, breakage of covalent bonds takes place releasing free electrons. At low temperature, the valence band of a semiconductor is completely filled and the conduction band is completely empty. The hole behaves as if it were a particle with a positive charge +e. Students can solve NCERT Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits MCQs Pdf with Answers to know their preparation level. Semiconductor materials lie in the range between conductor and insulator, as shown in Fig. Silicon carbide has been used to create blue light-emitting diodes (LEDs), and it can withstand high operating temperatures. Multiple Choice Questions on Resistance and Power. Crystal. Atomic no of Germanium A. D. All of … C Magnetic memory. Thus conductors have a positive temperature coefficient of resistance. Definition: Semiconductor memory is the main memory element of a microcomputer-based system and is used to store program and data. 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. 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