26-12-2017, 10:41 AM
Hard & Soft copy
*Printed copy of a document is known as
Ans : Hard Copy.
*Non printed copy of a document is known as Soft Copy.
*Printers can be divided into two categories.
Ans : Impact printers,Non Impact Printers
*In impact printers printing heads touch on the paper.
*Examples of impact printers are
*Dotmatrix printer
*Drum printer
*Line printer
*Chain printer
*Character printer
*Daisy wheel printer.
*Printing heads of non impact printers do not touch on the paper.
*Laser printer is an example of non. impact printer. Laser printer uses a laser beam, toner and a drum.
*Laser printers are also called page printers as they print one page at a time.
*Inkjet printer is another example of non impact printer..
*The output resolution of a printer is measured in
Ans : DPI (Dots Per Inch)
*The output device commonly used for Computer Aided Design (CAD) and Computer Aided Manufacturing (CAM) application
Ans : Plotter
CENTRAL PROCESSING UNIT (CPU)
*CPU controls; overall functioning of the computer.
*All the data processing is done inside CPU.
*CPU is known as the brain of the computer.
*Control unit is known as the Nerve centre of the computer.
*Three parts of the CPU are Arithmetic and Logic Unit (ALU) Control Unit
Memory Unit Arithmetic and Logic unit: ALU performs all arithmetical and logical operations.
*Control Unit : Control unit controls and coordinates the functions of all units of a
computer system?
*Part of CPU which decode program instruction (That means, fetches instruction from memory) -Control Unit
*Memory Unit: It is used for the storage of data.
*Memory is mainly classified into Primary
*Memory and Secondary Memory
*The term associated with processing speed of computer - MIPS (Million Instructions Per Second)
