Science GK

Science GK.Inventions,Inventors,Instruments,Units

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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 Cameras rely on Photo-electric 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 signal is 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 which stands 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 screes’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 solving a 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 known popularly 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 stored in 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 voltageis called a Transformer
123 A magnetic tape that records both audio and video signals is called a 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 Inc.,USA
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
143 The language PL/1 has combined features of COBOL and FORTRAN
144 BASIC stands for Begineers All Purpose Symbolic Instruction Code
145 COBOL stands for Common Busines Oriented Language
146 ALGOL stands for Algorithmic Language
147 ALGOL was developed in the early 1960s in Europe
148 COBOL was first introduced in the year 1961
149 FORTRAN stands for Formula Translation
150 FORTRAN was developed and introduced by IBM in the year 1957
151 PL/1 was introduced in the 1960s by IBM
152 COMAL stands for Common Algorithmic Language
153 BASIC was developed by John Kemeny and Thomas Kurtz
154 SNOBOL stands for String Oriented Symbolic Language
155 SNOBOL was developed in 1962
156 LISP stands for List Processing Language
157 LISP was developed by John McCarthy
158 Loud speaker was invented by Rice Kellogg
159 PROM stands for Programmable Read Only Memory
160 Two types of RAM chips are Dynamic,static
161 Data is fed into the computer by first converting it into Binary codes

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