Get Knowledge And Spread Knowledge

get knowledge - spread knowledge 01 the unit of frequency is hertz 02 the unit of resistance is ohm 03 the device which makes or breaks a circuit is switch 04 the path of an electric current is known as a circuit 05 device which opposes the flow of electric current is known as resistor 06 arc lamp was invented by c.f.brush 07 television was invented by j.l.baird 08 transistor was invented by j.bardeen, w.shockley and w.brattain 09 the unit of wavelength of light is angstrom 10 a device which converts light into electricity is known as photo cell 11 hertz was the first to discover radio waves 12 marconi invented radio 13 in 1901,marconi beamed a signal from cornwall in england to newfoundland 14 thomas edison was an american inventor 15 a glass tube with two electrodes is called a diode 16 lee de forest was an american scientist 17 lee de forest discovered the triode 18 radio and television transmit signals using electromagnetic waves 19 to turn pictures into electrical signals, television camerasrely on photoelectric effect 20 transistor was invented in the year 1948 21 the first electronic components invented were the thermionic valves 22 microchip was invented in the year 1958 23 microchip was invented by jack kilby 24 the microchip invented first was also the first integrated circuit 25 silicon and germanium are ideal examples of semi conductors 26 led stands for light emitting diode 27 the first computer was invented in the year 1834 28 the first computer was invented by charles babbage 29 the first computer invented was called analytical engine 30 in the present day electronic machines, computers function as artificial brains 31 cad means computer aided design 32 cpu stands for central processing unit 33 ram stands for random access memory 34 j.j .. thomson was a british physicist 35 in 1897,j.j.thomson discovered electrons 36 a device used for increasing the strength of electric signalis called amplifier 37 the height of a wave is called amplitude 38 an electron carries a charge negative 39 in a transistor, a base is the filling in the semiconductor sandwich 40 the tube behind the screen in tvs and most computers is called cathode ray tube 41 the force which makes an electric current is called electromotive force 42 device used for measuring small amounts of electric current is called galvanometer 43 sound too low to be heard by humans is called infrasound 44 vdu stands for visual display unit 45 one kilobyte is approximately 1000 bytes 46 dos stands for disk operating system 47 word star is a popular word processing programme 48 word star was developed by micro pro company 49 pc stands for personal computer 50 alu stands for arithmetic logic unit 51 the vdu and keyboard together form a terminal 52 the speed of the dot matrix printers is measured by cps whichstands for

characters per second 53 the speed of the line printers is measured by lpm which stands for lines per second 54 dbms stands for database management system 55 ibm is a famous computer company.ibm stands for international business machines corporation 56 rom stands for read only memory 57 the actual machine of the computer is commonly known as hardware 58 the programs run on the computer are commonly known as software 59 all the output which is printed on paper is called hard copy 60 the number of pixels on a computer screen determines a screen's resolution 61 a processor's speed is measured in megahertz 62 a software that assists the computer in performing instructions, is called as system software 63 cam stands for computer aided manufacturing 64 dpi stands for dots per inch 65 dtp stands for desk top publishing 66 eprom stands for erasable and programmable read only memory 67 a magnetic storage disk made out of a thin piece of plastic is called floppy disk 68 a pictorial representation of the step by step sequence for solvinga problem is known as a flow chart 69 a measure of storage capacity equal to one thousand megabytes is one gigabyte 70 a variable whose value is accessible throughout the program is called global variable 71 a huge worldwide network of computers that communicate with each other, allowing global communications between users is knownpopularly known as internet 72 kb stands for kilobyte 73 lan stands for local area network 74 a printer which uses light to transfer the image to paper is the laser printer 75 memory which retains all its contents even after the power is turned off is known as non-volatile memory 76 the result that is generated by the computer after processing the information provided to it is known as output 77 electronic mail is more popularly known as e-mail 78 pilot stands for programmed inquiry learning or teaching 79 pilot was developed by doug engelbardt 80 iql stands for interactive query language 81 logo was developed by dr. seymour papert 82 cal stands for computer assisted learning 83 apt stands for automatically programmed tooling 84 `c' language was invented by dennis m.ritchie 85 modula-2 was developed by niklaus wirth 86 terminals that have their own memory are called smart terminals 87 the memory that needs electric power to sustain its contents is known as volatile memory 88 mos stands for metallic oxide semiconductors 89 dvorak key board was designed by august dvorak 90 a simple device which functions as a simpler alternative to the keyboard is the mouse 91 automatic drawing input device is called scanner 92 in the second generation computers, magnetic cores were used as main memory devices 93 lcd stands for liquid crystal display 94 radar stands for radio detection and ranging 95 radar works on the principle of echo

96 software-in- hardware modules are called firmware 97 a device by which any microcomputer can use ordinary television set for producing output is called rf modulator 98 edsac stands for electronic delayed storage automatic computer 99 edvac stands for electronic discrete variable automatic computer 100 edsac was developed in the year 1949 101 edvac was developed in the year 1952 102 eniac stands for electronic numerical integrator and calculator 103 the most successful computing device in the ancient time was abacus 104 use of some mechanism for the operation of a machine is known as automation 105 radar contact with the moon was first made in 1945 106 radar contact with venus was first made in 1961 107 a system in which information is displayed on a television screen is known as video text system 108 a modern means of communication in which the information is storedin a computer at a tv station is known as teletext 109 global communication became possible by using satellites 110 morse code was invented by samuel morse 111 the code used in a teleprinter is the baudot code 112 teleprinter exchange is popularly known as telex 113 a device which converts sound waves into electrical waves is called microphone 114 avc stands for automatic volume control 115 the device used to measure wavelengths of radio waves is wavemeter 116 a hollow metallic tube used in place of wire in electric circuits carrying high frequency currents is called waveguide 117 an instrument used to measure the intensity of radiations is the radiometer 118 an instrument used to measure electrical voltage is the voltmeter 119 vtvm stands for vacuum tube volt meter 120 a circuit which maintains a constant voltage is called voltage stabilizer 121 scr stands for silicon controlled rectifier 122 a device used to increase or decrease electric voltage is called a transformer 123 a magnetic tape that records both audio and video signals is calleda video tape 124 the first electronic calculator was manufactured in 1963 by bell punch company, usa 125 maser stands for microwave amplification by stimulated emission of radiation 126 a computer which can handle a large volume of numbers is called a number cruncher 127 post stands for power on self test 128 post is a test carried out just after the computer has been switched on 129 an index of the files stored on a disk is called directory 130 cp/m stands for control program for microcomputers 131 cp/m was developed by digital research incusa 132 mvs stands for multiple virtual storage operating system 133 mvs is used in mainframe computers 134 the process of starting a computer is called booting 135 a group of four binary digits is called a nibble 136 bpi stands for bit per inch 137 a smart card is a multifunctional microprocessor 138 lips stands for logical inferences per second 139 a computerized machine is normally called a robot 140 a robot is a machine directed by a computer 141 a robot which resembles a human being is called an android 142 pl/1 stands for programme language-1

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the language pl/1 has combined features of cobol and fortran basic stands for begineers all purpose symbolic instruction code cobol stands for common busines oriented language