Data Representation Computer Awareness topic for exams

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Memory Units:

4 bit = 1 nibble 

8 bit = 1 byte 

1024 B = 1 KB (Kilo Byte) 

1024 KB = 1 MB (Mega Byte) 

1024 MB = 1 GB (Giga Byte) 

1024 GB = 1 TB (Tera Byte) 

1024 TB = 1 PB (Peta Byte) 

1024 PB = 1 XB (Exa Byte) 

1024 XB = 1 ZB (Zeta Byte) 

1024 ZB = 1 YB (Yota Byte) 

bit < Byte < KB < MB < GB < TB < PB < XB < ZB < YB 

►bit (b)

►Byte (B)

►Mbps – mega bits per sec.

►MBps – mega Bytes per sec.

►The information you put into the computer is called Data

►Information of a computer is stored as Digital Data

►A number system defines a set of values that is used to represent Quantity

►In which number system, the modern computers are operated? Binary Number System

►Name the most significant bit, which represent 1 and 0 for a positive number and negative number, respectively.

►Sign Bit

Which coding scheme represents data in a binary form in the computer system? ASCII, EBCDIC and Unicode are the most commonly used codes under this scheme.

►Binary Coding Scheme

EBCDIC is a 8-Bit code with 256 different representations of characters. It is mainly used in mainframe computers.

EBCDIC stands for Extended Binary Coded Decimal Interchange Code

►In the Hexadecimal Number System each number represents a power of 16. To represent the decimal numbers, this system uses numbers from 0 to 9 and characters from A to F to represent numbers 10-15, respectively. It is commonly used as a shortcut notation for groups of four binary digits

►BCD is a method that represents the decimal digits with the help of binary digits. It takes advantage that one decimal numeral can be represented by 4-bit pattern. BCD stands for Binary Coded Decimal

This coding system is used to represent the interval storage area of the computers. In this system, every character is represented by a combination of bits. 

►Binary Coding System

The Base or Radix of the decimal number system is 10

The arithmetic operations (addition, subtraction, multiplication and division) performed on the binary numbers is called Binary Arithmetic

►What is the standard code the computer industry created to represent characters? American Standard Code for Information Interchange (ASCII).

ASCII is a code used for standardizing the storage and transfer of information amongst various computing devices.

It is required for representing more than 64 characters. At present, the mostly used coding systems are ASCII and EBCDIC

►Which code is also known as Reflected Code? Gray Code

The 7-bit ASCII code is widely used for Two (0 or 1)

In the binary language, each letter of the alphabet, each number and each special character is made up of a unique combination of Eight Bits.