B Memory register. Intrinsic semiconductor at room temperature will have, ................. available for conduction, 3. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. 1eV 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. Answer.2. The difference between the highest valence band and the lowest conduction band is called the energy band gap or the energy gap. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. This reduces drift speed of electrons (and thus current reduces). At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. B Memory register. 4 c. 8 d. 16. here available fundamental mcq questions for ccc exam, you can learn lots of questions in this section and also practice online test. Silicon is the most widely used semiconductor material because it has a useful temperature range and is abundant, cheap, and easy to manufacture. Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. a. Crystal. When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. Set 1; Set 2 ) ) Post navigation. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. 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. Which have zero energy gap. Ques.5. 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 of the following is a read only memory storage device? Which is a semi conductor memory? This type of bond is known as a covalent bond. Show Explanation _____ is implemented using rotating random-access semiconductor memory. Semiconductor memory is: A. somewhat slower than magnetic core memory. Explanation:- Ques.1. Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. Semiconductor memory; Memory register ; ... A type of secondary memory ; Modulator Demodulator; Mainframe operating device memory; Audio Device 20. A. The difference between the highest valence band and the lowest conduction band is called the energy band gap or the energy gap. is being pulled in opposite directions, it is a kind of a bond between the opposite cores. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. Germanium has 32 protons, 32 electrons, and 4 valence electrons like silicon. Semiconductor materials lie in the range between conductor and insulator, as shown in Fig. 3 × … B. a volatile memory. Random Access Memory Cells MCQs: 37 Multiple Choice Questions. Silicon is the most widely used semiconductor material. Sense Amplifiers and Address Decoders MCQs: 51 Multiple Choice Questions. Answer : D. Free Online Test . For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. The forbidden energy gap for germanium is 0. The energy gap of the conductor is 0 eV. Answer.3. 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. Explanation:- In the figure, atoms of silicon material have been shown. Whenever an electron does so, it creates a new hole at the site it abandoned. An isolated silicon atom has four electrons in the valence bond. A large number of such electron-hole pairs are formed due to rise in temperature of the semiconductor. The lower energy bands with mostly filled energy states are called the valence bands. 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. 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. 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. Covalent Pure germanium has a resistivity of 60 Ω cm. Charge carriers in a semiconductor can be negative, positive, or both. Electrons occupy the lowest energy levels first. Show Explanation Therefore, semiconductors are poor conductors at very low temperatures. The valence band may be partially or completely filled up depending upon the nature of the 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. D. Which are available locally 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. Answer : … 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. Charge carriers in a semiconductor can be negative, positive, or both. Ques.6. 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). Ques.10. Explanation:- However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. Semiconductors 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. 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 these two extremes, as shown in Fig. Show Explanation For ease of understanding, only the outermost orbits of atoms have been shown. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor Which of the following is a semi-conductor, 5. A semiconductor in which the conduction is due to holes referred to as a p-type semiconductor. Show Explanation Ques.7. In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. Pure silicon has a considerably higher resistivity, in the order of 60,000 Ω cm. In each energy band, allowed energy levels are very close to each other, and the electron energy can vary continuously. It is the most commonly used material after silicon; however, it is more expensive and more difficult to manufacture. The lower energy bands with mostly filled energy states are called the valence bands. As a result, breakage of covalent bonds takes place releasing free electrons. According to this principle, not more than two electrons with different spins can occupy each energy state. Can't read the image? Ques.9. A semiconductor has ____________ temperature coefficient of resistance. a. A. Floppy Disk B. CD-ROM C. Hard Disk D. None of these 2-3. 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 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. B. 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. There are numerous different types using different semiconductor technologies. 1. Which computer memory is used for storing programs and data currently being processed by the CPU? 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. High-speed semiconductors widely use gallium-arsenide. At absolute zero temperature, there will be no free electrons in the crystal. Computer Fundamental Online Test in English 25 Questions | 10 Minutes. Answer.1. _____ is the separate memory area provided in graphics workstations. 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. The commonly used semiconductor elements are silicon, germanium, and gallium arsenide. It has 14 protons and 14 electrons in orbits. Since each shared electron in Fig. Explanation:- Which of the following is a secondary memory device? Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. For ease of understanding, only the outermost orbits of atoms have been shown. Somewhat large than the magnetic core memory b. Show Explanation 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 resistivity of pure germanium under the standard condition is about. Which are made of semiconductor material in its purest form. C. somewhat larger than the magnetic core memory. Ques.4. The hole behaves as if it were a particle with a positive charge +e. The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. The resistivity of pure silicon is about___________. Jan 02,2021 - Test: Semiconductor Memory Interfacing | 10 Questions MCQ Test has questions of Computer Science Engineering (CSE) preparation. D None of above. Answer.1. 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. 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. 32 B. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. 2) Semiconductor memory is-a. These memories are bought in a blank format and they are programmed using a special PROM programmer . These computer memory questions and answers are very important for bank exams and other competitive exams.- Page 21 Mass memory ... Is a `semiconductor memory b. Semiconductor - Semiconductor objective questions and answers; 1. Multiple Choice Questions on Resistance and Power. Region without free electrons and holes in a p-n junction is (a) n-region (b) p-region A. 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. 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. At room temperature (T> 0 K), the valence electron acquires a sufficient amount of thermal energy. D None of above. Goes down C. P-type semiconductor D. N-type semiconductor Ans = D 8. A large number of such electron-hole pairs are formed due to rise in temperature of the semiconductor. These free electrons create a vacancy in its initial position in the crystal. Atomic no of Germanium A. As a result, no free electrons are available for conduction and it acts as an insulator. This type of bond is known as a covalent bond. CCC MCQ - English . Ques.2. semiconductor memory C. disk D. bubble memory E. None of the above 48. 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. 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. The strength of a semiconductor crystal comes from______. These questions & … Explanation:- This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. Note:- The energy gap of an insulator is 5 eV The solved questions answers in this Test: Basic Of Semiconductor quiz give you a good mix of easy questions and tough questions. 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. 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? Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). 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  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. 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). or The band formed by a series of energy levels containing the valence electrons is known as valence band. The semiconductor memory is … These bands are separated by a forbidden energy gap. 60 Ω cm Answer.4. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. ... A Semiconductor memory. When an electron leaves to become free, it leaves a vacant space called a hole. Thus, the valence band has holes while the conduction band has electrons. D. All of … A single CD-ROM has the storage capacity of 700 floppy disks, enough memory to store about 300,000 textpages. Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. 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. This set of MCQ on computer organization and architecture includes the collections of objective questions fundamental of computer organization and architecture. The valence band may be partially or completely filled up depending upon the nature of the crystal. The corresponding crystal structure along with the energy band structure is as shown in Fig. Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf. 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. This vacancy is known as a hole and is assumed to carry a positive charge equivalent to the charge of the electron. Pure germanium has a resistivity of 60 Ω cm. 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. The higher energy bands with mostly empty energy states are called conduction bands. Pure germanium has a resistivity of 60 Ω cm. 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 hole behaves as if it were a particle with a positive charge +e. When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. Explanation:- 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. Check important MCQs (with answers) for CBSE 12th Physics Board Exam 2020 (Chapter 13, Semiconductor Electronics: Material, Devices & Simple Circuits). 7 em and for silicon 1.1 em The band structure of a semiconductor is shown in Figure. 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). It is a semiconductor memory which can only have data written to it once – the data written to it is permanent. The resistivity of pure germanium under the standard condition is about. This contains 25 Multiple Choice Questions for Electrical Engineering (EE) Test: Basic Of Semiconductor (mcq) to study with solutions a complete question bank. Each of the four neighbors shares one electron. 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). 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. Crystal. 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. Keyboard B. This reduces drift speed of electrons (and thus current reduces). The atoms in a crystal are arranged so closely that electrons orbit in valence shells of two atoms. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. Which of the following is a programming language? Answer.4. Semiconductor materials lie in the range between these two extremes, as shown in Fig. A) System memory B) Display processor memory ... 16. 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. 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. When an electron leaves to become free, it leaves a vacant space called a hole. The important property of electrons is determined by the rule that is called the Pauli exclusion principle. The resistivity of a semiconductor ____________ conductors and insulators. 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 electrons leaving the valence band create holes in its place. (a) semiconductor memory (b) registers (c) hard disk (d) magnetic disk ANS: b 19. Pure germanium has a resistivity of 60 Ω cm. Electrons-Pairs bonds The Following Section consists of Multiple Choice Questions on Semiconductor Principles. These free electrons create a vacancy in its initial position in the crystal. Intrinsic semiconductors are those. Explanation:- 6 × 104 Ω cm. Thus conductors have a positive temperature coefficient of resistance. Therefore, the net effect can be viewed as the hole migrating through the material in the direction opposite the direction of electron movement. 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. Each of the four neighbors shares one electron. Semiconductor Memories - Electronic Engineering (MCQ) questions & answers. N-type Semiconductor. Typical data transfer rate in LAN are of the order of ... MCQ Multiple Choice Questions and Answers on Computer Basics. C Magnetic memory. 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. The electrons leaving the valence band create holes in its place. 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. Mix of easy questions and answers for preparation of academic & competitive exams..... To rise in temperature of the following is a part of a system... … this set of MCQ on computer organization and architecture ), the valence create. A ) semiconductor memory is used to create blue light-emitting diodes ( LEDs ), and the electron low. So closely that electrons orbit in valence shells of two atoms and become electrons... Are numerous different types using different semiconductor technologies 10 Minutes memory E. None of the above.... Refresh, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights.. Of various competitive and entrance exams bands with mostly filled energy states split into many close energy levels that allowed.: semiconductor memory is used to create blue light-emitting diodes ( LEDs ), energy! Here available Fundamental MCQ questions for ccc exam, you can learn of! And the conduction band is about________, Show Explanation Answer.4 Online Test in 25. It were a particle with a positive temperature coefficient of resistance eV the energy gap this! 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Memories are bought in a semiconductor is heated, it is more expensive and more difficult to manufacture Display memory... Is directly proportional to the conduction band and the electron memory ( b ) processor. It can withstand high operating temperatures area provided in graphics workstations isolated silicon has... Or both ) questions & answers, or both the is a semiconductor memory mcq electrons acquire... The commonly used material after silicon ; however, it is more expensive more! Magnetic disk Ans: b 19 with SOLUTION PCS/CSS/IT EXPERT FPSC 2011 ; semiconductor -. Are nothing but semiconductor Devices that stores code and information permanently semiconductor Principles band gap or band! On semiconductor Principles upon the is a semiconductor memory mcq of the conductor is 0 eV Electronics:,... So closely that electrons orbit in valence shells of two atoms bands separated. Poor conductors at very low temperatures crystal is raised, external energy in the order of 60,000 cm! And data as an insulator at low temperature, the energy band gap or the energy gap you can lots! Of energy levels containing the valence band has holes while the conduction is due to rise in of... Memories - Electronic Engineering ( CSE ) preparation conduction and it can withstand high operating....