Electronics and Computer: No.QuestionAnswer 01The unit of frequency isHertz 02The unit of resistance isOhm 03The device which makes or breaks a circuit isSwitch 04The path of an electric current is known as aCircuit 05Device which opposes the flow of electric current is known asResistor 06Arc Lamp was invented byC.F.Brush 07Television was invented byJ.L.Baird 08Transistor was invented byJ.Bardeen,W.Shockley and W.Brattain 09The unit of wavelength of light isAngstrom 10A device which converts light into electricity is known asPhoto cell 11Hertz was the first to discoverRadio waves 12Marconi inventedRadio 13In 1901,Marconi beamed a signal from Cornwall in England toNewfoundland 14Thomas Edison was anAmerican inventor 15A glass tube with two electrodes is called aDiode 16Lee de Forest was anAmerican scientist 17Lee de Forest discovered theTriode 18Radio and television transmit signals usingElectromagnetic waves 19To turn pictures into electrical signals,television Cameras rely onPhoto-electric effect 20Transistor was invented in the year1948 21The first electronic components invented were theThermionic valves 22Microchip was invented in the year1958 23Microchip was invented byJack Kilby 24The microchip invented first was also the firstIntegrated circuit 25Silicon and germanium are ideal examples ofSemi conductors 26LED stands forLight Emitting Diode 27The first computer was invented in the year1834 28The first computer was invented byCharles Babbage 29The first computer invented was calledAnalytical Engine 30In the present day electronic machines,computers function asArtificial brains 31CAD meansComputer Aided Design 32CPU stands forCentral Processing Unit 33RAM stands forRandom Access Memory 34J.J. Thomson was aBritish physicist 35In 1897,J.J.Thomson discoveredElectrons 36A device used for increasing the strength of electric signal is calledAmplifier 37The height of a wave is calledAmplitude 38An electron carries a chargeNegative 39In a transistor,a base is theFilling in the semiconductor sandwich 40The tube behind the screen in TVs and most computers is calledCathode Ray Tube 41The force which makes an electric current is calledElectromotive Force 42Device used for measuring small amounts of electric current is calledGalvanometer 43Sound too low to be heard by humans is calledInfrasound 44VDU stands forVisual Display Unit 45One kilobyte is approximately1000 bytes 46DOS stands forDisk Operating System 47WORD STAR is a popularWord processing programme 48WORD STAR was developed byMicro pro Company 49PC stands forPersonal Computer 50ALU stands forArithmetic Logic Unit 51The VDU and Keyboard together form aTERMINAL 52The speed of the dot matrix printers is measured by CPS which stands forcharacters per second 53The speed of the line printers is measured by LPM which stands forLines per second 54DBMS stands forDatabase Management System 55IBM is a famous computer company.IBM stands forInternational Business Machines Corporation 56ROM stands forRead Only Memory 57The actual machine of the computer is commonly known asHardware 58The programs run on the computer are commonly known asSoftware 59All the output which is printed on paper is calledHard Copy 60The number of pixels on a computer screen determines a screes'sResolution 61A processor's speed is measured inMegahertz 62A software that assists the computer in performing instructions,is called assystem software 63CAM stands forComputer Aided Manufacturing 64DPI stands forDots per Inch 65DTP stands forDesk Top Publishing 66EPROM stands forerasable and Programmable Read only Memory 67A magnetic storage disk made out of a thin piece of plastic is calledFloppy Disk 68A pictorial representation of the step by step sequence for solving a problem is known as aFlow Chart 69A measure of storage capacity equal to one thousand megabytes is oneGigabyte 70A variable whose value is accessible throughout the program is calledGlobal Variable 71A huge,worldwide network of computers that communicate with each other,allowing global communications between users is known popularly known asInternet 72KB stands forKilobyte 73LAN stands forLocal Area Network 74A printer which uses light to transfer the image to paper is theLaser Printer 75Memory which retains all its contents even after the power is turned off is known asNon-Volatile Memory 76The result that is generated by the computer after processing the information provided to it is known asOutput 77Electronic mail is more popularly known asE-Mail 78PILOT stands forProgrammed Inquiry Learning Or Teaching 79PILOT was developed byDoug Engelbardt 80IQL stands forInteractive Query Language 81LOGO was developed byDr.seymour Papert 82CAL stands forComputer Assisted Learning 83APT stands forAutomatically Programmed Tooling 84`C'language was invented byDennis M.Ritchie 85Modula-2 was developed byNiklaus Wirth