1.1 Data representation

Question 1

Binary

Answer 1

base two number system based on the values 0 and 1 only

Question 2

Bit

Answer 2

abbreviation for binary digit

Question 3

One’s complement

Answer 3

each binary digit in a number is reversed to allow both negative and positive numbers to be represented

Question 4

Two’s complement

Answer 4

each binary digit is reversed and 1 is added in the right-most position to produce another method of representing negative and positive numbers

Question 5

Sign and magnitude

Answer 5

binary number system where left-most bit is used to represent the sign (0 = positive, 1 = negative) meanwhile the remaining bits represent the binary value

Question 6

Hexadecimal

Answer 6

a number system based on the value 16 (uses the denary digits from 0 to 9 and letters from A to F)

Question 7

Memory dump

Answer 7

contents of a computer memory output to a screen or printer

Question 8

Binary-coded decimal (BCD)

Answer 8

number system that uses 4 bits to represent each denary digit

Question 9

ASCII code

Answer 9

coding system for all the characters on a keyboard and control codes

Question 10

Character set

Answer 10

a list of characters that have been defined by computer hardware and software

Question 11

Unicode

Answer 11

coding system which represents all the languages of the world (first 128 characters are the same as ASCII code).