D None of above. The forbidden energy gap for germanium is 0. 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. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. The corresponding crystal structure along with the energy band structure is as shown in Fig. Explanation:- Which are made of semiconductor material in its purest form. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. Answer.3. Which of the following is a semi-conductor, 5. ... A Semiconductor memory. 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. Covalent Each valence shell electron fills the hole of the neighboring atom as shown in Fig. Thus conductors have a positive temperature coefficient of resistance. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. Note:- The energy gap of an insulator is 5 eV C Magnetic memory. At 0 K, all valence electrons are strongly bound to their atoms and are actively participating in the covalent bond formation. semiconductor memory C. disk D. bubble memory E. None of the above 48. D. All of … Check important MCQs (with answers) for CBSE 12th Physics Board Exam 2020 (Chapter 13, Semiconductor Electronics: Material, Devices & Simple Circuits). Semiconductors are neither conductors nor insulators. A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms. A large number of such electron-hole pairs are formed due to rise in temperature of the semiconductor. 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. B Memory register. The commonly used semiconductor elements are silicon, germanium, and gallium arsenide. 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). Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf. 60 Ω cm Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal (Fig). B. a volatile memory. Silicon is the most widely used semiconductor material. 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. When an electron leaves to become free, it leaves a vacant space called a hole. Which of the following is a programming language? 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? The main memory elements are nothing but semiconductor devices that stores code and information permanently. 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 covalent bonds hold the tetravalent crystal together, ensuring its stability. 32 B. 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. Germanium has 32 protons, 32 electrons, and 4 valence electrons like silicon. The most commonly used semiconductor is _________. 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. Multiple Choice Questions and Answers on Semiconductor Diode. 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. As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Each valence shell electron fills the hole of the neighboring atom as shown in Fig. a. Explanation:- 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). The solved questions answers in this Test: Basic Of Semiconductor quiz give you a good mix of easy questions and tough questions. Multiple choice questions on IT Fundamentals topic Secondary Storage Devices. Read Only Memory ROM MCQs: 149 Multiple Choice Questions. This vacancy is known as a hole and is assumed to carry a positive charge equivalent to the charge of the electron. When an electron leaves to become free, it leaves a vacant space called a hole. A semiconductor atom having four valence electrons and four holes require four more electrons so as to make the outermost orbit completely filled (total number must be eight). Each valence shell electron fills the hole of the neighboring atom 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. The resistivity of pure germanium under the standard condition is about. Random Access Memory Cells MCQs: 37 Multiple Choice Questions. For every free electron, there will be a corresponding hole produced, which is called an electron-hole pair. A) System memory B) Display processor memory ... 16. The corresponding crystal structure along with the energy band structure is as shown in Fig. Charge carriers in a semiconductor can be negative, positive, or both. Therefore, the net effect can be viewed as the hole migrating through the material in the direction opposite the direction of electron movement. 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. Whenever an electron does so, it creates a new hole at the site it abandoned. 2) Semiconductor memory is-a. 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). Whereas in the case of conductors, when the temperature increases its resistivity increases as electrons collide more frequently with vibrating atoms. Floppy Disk B. CD-ROM C. Hard Disk D. None of these 2-3. 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. 6 × 104 Ω cm. N-type Semiconductor. 2 b. Computer Graphics MCQ Multiple Choice Questions with Answers. Answer.2. Since each shared electron in Fig. The higher energy bands with mostly empty energy states are called conduction bands. Somewhat large than the magnetic core memory b. Explanation:- When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. CCC MCQ - English . 3 × … Multiple Choice Questions on Alternating Current vs Direct Current . a. The valence band may be partially or completely filled up depending upon the nature of the crystal. For ease of understanding, only the outermost orbits of atoms have been shown. The resistivity of pure germanium under the standard condition is about. A semiconductor in which the conduction is due to holes referred to as a p-type semiconductor. The ability of a material to conduct current is directly proportional to the number of free electrons in the material. Thus the covalent bond is formed by sharing of electrons between similar atoms. The lower energy bands with mostly filled energy states are called the valence bands. Multiple Choice Questions - ... MCQS WITH SOLUTION PCS/CSS/IT EXPERT FPSC 2011; Negative Answer.4. 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. Dynamic B. Static C. Bubble D. Both a & b 2-2. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. Whenever an electron does so, it creates a new hole at the site it abandoned. When a pure semiconductor is heated, it’s resistance_______. 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. Thus, the valence band has holes while the conduction band has electrons. These bands are separated by a forbidden energy gap. 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. Semiconductor materials lie in the range between conductor and insulator, as shown in Fig. Which is a semi conductor memory? Ques.7. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Ques.3. When an electron leaves to become free, it leaves a vacant space called a hole. 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 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 : When the temperature of the crystal is raised, external energy in the form of heat gets applied to the semiconductor material. You have to select the right answer to a question. _____ is implemented using rotating random-access semiconductor memory. The difference between the highest valence band and the lowest conduction band is called the energy band gap or the energy gap. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. Semiconductors CD-ROM is a a) Semiconductor memory b) Memory register c) Magnetic memory d) All of the above e) None of the above Semiconductors are those materials which have electrical conductivities lying between those of good conductors and insulators. Answer.1. Basic Computer Fundamental Introduction to Windows Basic DOS Commands Elements of Word Processing Spreadsheets ... A Semiconductor memory. or The band formed by a series of energy levels containing the valence electrons is known as valence band. However, at room temperature, some electrons cross over to the conduction band giving a little conductivity to the semiconductor. When atoms form solids, their electron energy states split into many close energy levels that form allowed energy bands. computer fudamental mcq questions in english:- student ! It has 14 protons and 14 electrons in orbits. 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  Each of the four neighbors shares one electron. A semiconductor generally has ____________ valence electrons. 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. Which of the following is a secondary memory device? Atomic no of Germanium A. Answer : … D None of above. High-speed semiconductors widely use gallium-arsenide. These MCQs are very helpful for the preparation of academic & competitive exams ... 8. Region without free electrons and holes in a p-n junction is (a) n-region (b) p-region Lies between that of Therefore, a semiconductor virtually behaves like an insulator at low temperature. These computer memory questions and answers are very important for bank exams and other competitive exams.- Page 21 In the figure, atoms of silicon material have been shown. is being pulled in opposite directions, it is a kind of a bond between the opposite cores. This heat energy enables the valence electrons to acquire sufficient energy to break away from the atoms and become free electrons. 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. The hole behaves as if it were a particle with a positive charge +e. High-speed semiconductors widely use gallium-arsenide. A. Lotus Semiconductor - Semiconductor objective questions and answers; 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. Charge carriers in a semiconductor can be negative, positive, or both. _____ is the separate memory area provided in graphics workstations. The hole behaves as if it were a particle with a positive charge +e. 7 em and for silicon 1.1 em The band structure of a semiconductor is shown in Figure. The electrons leaving the valence band create holes in its place. 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. SPICE The resistivity of a semiconductor ____________ conductors and insulators. is being pulled in opposite directions, it is a kind of a bond between the opposite cores. C. somewhat larger than the magnetic core memory. These questions & … The lower energy bands with mostly filled energy states are called the valence bands. 7 em and for silicon 1.1 em The band structure of a semiconductor is shown in Figure. Semiconductor memory is: A. somewhat slower than magnetic core memory. Semiconductors have the same type of band structure as an insulator; but the energy gap is much smaller, on the order of 1 eV. There are numerous different types using different semiconductor technologies. 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. Ques.1. A.Which are made of semiconductor material in its purest form, 2. According to this principle, not more than two electrons with different spins can occupy each energy state. 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. 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 & Explanation Answer: B) FALSE Explanation: "CD-ROM is a semiconductor memory" is a FALSE statement.. 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 difference between the highest valence band and the lowest conduction band is called the energy band gap or the energy gap. Insulators such as glass, rubber, and mica, which have very few loosely held electrons, have resistivities as high as several million ohm-centimeters. Examtime Quiz app for Android! This type of bond is known as a covalent bond. And insulator, as shown in Fig Windows Basic DOS Commands elements of Word Processing Spreadsheets a. 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