02: Computer System Organisation : Cbse-ix-foundation Percent 252520of%252520information%252520technology%252520.

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Qstn #5
A computer is used to type documents, send E-mail and browse the Internet. It is very useful to us.

#5-i
What are the basic parts of a computer?
Ans : Hardware, software, data and information.

#5-ii
Write some characteristics of a computer.
Ans : Accuracy, speed, diligence and reliability.

#6-i
What do you mean by memory?
Ans : Computer memory enables a person to retain the information that is stored on the computer.

#6-ii
How many types of memory the computer has?
Ans : Computer has basically two types of memory as follows:
Internal memory Main memory units (RAM and ROM) and cache memory.
External memory Secondary memory.

Qstn #7
Identify input/output devices from the clues given below: (a) Transfers typed or handwritten texts, graphs, diagrams and photographs into a digital format. (b) Reads the code number, which is encoded as a series of black and white lines on the product. (c) Checks and marks an examination answer sheet that contains multiple choice questions. (d) Processes the cheque number and code. (e) Produces images on paper such as numbers, alphabets and graphics. (f) Receives sound in the form of electric current from a sound card and then converts it to the sound format.
Ans : (a) Scanner (b) Barcode reader (c) Optical Mark Recognition (OMR) (d) Magnetic Ink Character Recognition (MIGR) (e) Printer (f) Speaker

#7-a
Transfers typed or handwritten texts, graphs, diagrams and photographs into a digital format.
Ans : Scanner

#7-b
Reads the code number, which is encoded as a series of black and white lines on the product.
Ans : Barcode reader

#7-c
Checks and marks an examination answer sheet that contains multiple choice questions.
Ans : Optical Mark Recognition (OMR)

#7-d
Processes the cheque number and code.
Ans : Magnetic Ink Character Recognition (MIGR)

#7-e
Produces images on paper such as numbers, alphabets and graphics.
Ans : Printer

#7-f
Receives sound in the form of electric current from a sound card and then converts it to the sound format.
Ans : Speaker