02: Computer System Organisation : Cbse-ix-foundation Of Information Technology .

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Qstn #1
Name the most commonly used input device.
Ans : Keyboard is the most commonly used input device, which can also be used to type commands directing the computer to perform certain actions.

Qstn #2
Explain the main advantage and disadvantage of an OCR?
Ans : The main advantage of an OCR is the ability to scan the characters accurately.
The disadvantage of an OCR is limited number of characters offered by it.

Qstn #3
Why do we use webcam?
Ans : A webcam is basically used for capturing a series of digital images that are transferred by the computer to a server and then displayed to the hosting page.

Qstn #4
Name the memory (Primary/Secondary)with the following features:
If current is interrupted, data is lost.
Before a program is ready to run, the program is loaded into this memory, which allows the CPU directly access the program.
Ans : RAM because it has above given features.

Qstn #5
Write any one advantage of cache memory.
Ans : The main advantage of cache memory is that if needed data is found in cache, then CPU does not have to use mother¬board’s system bus for data transfer and processing gets fast.

Qstn #6
Which disc is created using laser beam?
Ans : CD-ROM disc is created using laser beam.

Qstn #7
Give one difference between primary and secondary memory.
Ans : The primary memory is volatile and has limited storage capacity, whereas secondary memory is non-volatile and can store huge amount of data.

Qstn #8
Arrange the following memory units in ascending order of their storage capacities: Kilobyte, Byte, Terabyte, Megabyte, Geopbyte
Ans : The ascending order of memory units is Byte, Kilobyte, Megabyte, Terabyte, Geopbyte.

Qstn #9
Where can a memory card be used?
Ans : Memory card can be used in digital camera, cell phones, camcoders, portable audio players, video players, PDAs, gaming consoles, laptops, printers etc.

Qstn #10
Define the term byte. Differentiate between a bit and a byte.
Ans : Byte is a unit of measuring computer storage. Binary digit is called bit in short. There are only two binary digits 0 and 1, whereas a combination of 8 bits is called a byte.

Qstn #1
Differentiate between OCR and OMR.
Ans : OCR stands for Optical Character Recognition which is used to read characters of special type font that are printed on conventional paper with conventional ink.
On the other hand, OMR stands for Optical Mark Recognition which is used to transcribe marks that are marked with a dark pencil or ink on a special pre-printed form (e.g. answer sheet of a multiple choice question paper where a choice of answer can be reflected by shading the appropriate box).

Qstn #2
Name the device which is used to read the barcode. Explain in short.
Ans : Barcode reader is a device which is used to read the printed code (barcode) from the products to be sold. It contains a light sensitive detector which identifies the values of the bars printed on the product and converts them into a numeric code. This barcode reader technology is used in shopping malls to identify products and generate bills.