1.1 Data Representation

Question 1

What is binary?

Answer 1

Base 2 number system based on the values 0 and 1 only

Question 2

What is bit?

Answer 2

Abbreviation for binary digit

Question 3

What is hexadecimal?

Answer 3

A number system based on the value 16, uses 0-9 and A-F

Question 4

What is a memory dump?

Answer 4

Contents of a computer memory output to a screen or printer

Question 5

1 KB

Answer 5

1000 bytes

Question 6

1 MB

Answer 6

One million bytes

Question 7

1 GB

Answer 7

1 billion bytes

Question 8

1 TB

Answer 8

1 trillion bytes

Question 9

1 Petabyte

Answer 9

1 quadrillion bytes

Question 10

1 Kibibyte (1 KiB)

Answer 10

2^10

Question 11

1 mebibyte (1MiB)

Answer 11

2^20

Question 12

1 gibibyte (1GiB)

Answer 12

2^30

Question 13

1 tebibyte (1TiB)

Answer 13

2^40

Question 14

1 pebibyte (1 PiB)

Answer 14

2^50

Question 15

What do you need to interpret results of a memory dump?

Answer 15

Knowledge of computer architecture

Question 16

What is one’s complement?

Answer 16

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

Question 17

What is two’s complement?

Answer 17

Each binary digit is reversed and add 1 to the LSB to produce another method of representing negative numbers.

Question 18

What is BCD?

Answer 18

Binary coded decimal, a system that uses 4 bit code to represent each denary digit.

Question 19

Uses of BCD

Answer 19

Representation of digits on a calculator or clock display.
In cases like accounting, exact values are needed, so BCD is used to store data to prevent significant errors.

Question 20

ASCII code

Answer 20

American Standard Code for Information Interchange
The standard ASCII code character set has 7 bits, represents letters, number and characters on a standard keyboard.

Question 21

Unicode

Answer 21

Allows characters to represent all languages of the worlds, supports more operating systems and search engines globally.