# 2.1.4 Data Representation

### Description

Quiz for the A451 topic data representation
Quiz by Lavington ICT, updated more than 1 year ago
 Created by Lavington ICT over 9 years ago
741
10

## Resource summary

### Question 1

Question
Modern computers work in binary because it is easy to represent two states in simple electronic circuits. Binary is a...
• a base 2 numbering system with 2 symbols.
• a base 6 numbering system with 6 symbols.
• a base 10 numbering system with 10 symbols.
• a base 4 numbering system with 4 symbols.

### Question 2

Question
Each digit in binary is called a...
• byte
• nibble
• bit
• kilobyte

### Question 3

Question
A group of 8 binary bits is called a...
• byte
• bit
• nibble

### Question 4

Question
A group of 4 binary bits is called a...
• bit
• byte
• nibble

### Question 5

Question
How many kilobytes are in a megabyte?
• 1000
• 1028
• 1024
• 1026

### Question 6

Question
How many megabytes are in a gigabyte?
• 1024
• 1028
• 1026
• 1000

### Question 7

Question
If a computer has only 8 bits to store a value then the last bit of a 9 bit number will be lost. This is called...
• an over error.
• an overflo error.
• an overflow error.
• an underflow error.

Question
• base 12
• base 6
• base 16
• base 10
• base 18

### Question 9

Question
All symbols displayed in a computer are represented by a code. The computer looks up the symbol matching the code from a list of codes and their associated characters. The list of codes and characters is called the...
• character set.
• character collection.
• character group.
• character assemble.

### Question 10

Question
ASCII uses...
• 7 bits so can provide 127 characters or symbols plus the null character (128 in total).
• 7 bits so can provide 127 characters or symbols.
• 7 bits so can provide 127 characters plus the null character (128 in total).

### Question 11

Question
Unicode uses 16 bits...
• providing over 65,000 possibilities or 32 bits providing over 2 billion possibilities.
• providing over 65,000 possibilities or 32 bits providing over 1 billion possibilities.
• providing over 65,000 possibilities or 32 bits providing over 3 billion possibilities.
• providing over 65,000 possibilities or 32 bits providing over 4 billion possibilities.

### Question 12

Question
A pixel is one dot in an image. The number of bits per pixel determines...
• how many colours each dot can represent.
• how many dots each dot can represent.
• how many shades each dot can represent.
• how many pixels each dot can represent.

### Question 13

Question
The more bits per pixel the greater the...
• pixel depth.
• colour depth.
• dot depth.

### Question 14

Question
The resolution of an image is the...
• number of dots per unit, e.g.the number of dots per inch (usually called dots per inch or 'dpi').
• number of pixels per unit, e.g.the number of pixels per inch (usually called dots per inch or 'dpi').
• number of pixels per unit, e.g.the number of dots per inch (usually called dots per inch or 'dpi').

### Question 15

Question
The sample rate of a sound is the...
• number of times per minute that the sound wave is measured. The higher the sample rate the more accurately the wave is represented.
• number of times per second that the sound wave is measured. The lower the sample rate the more accurately the wave is represented.
• number of times per second that the sound wave is measured. The high the sample rate the more accurately the wave is represented.

### Question 16

Question
The sample interval of a sound is the...
• wave gap between measurements of a sound wave being taken.
• time gap between measurements of a sound being taken.
• time gap between measurements of a sound wave being taken.

### Question 17

Question
The sample resolution of a sound is the...
• number of bits used to store the value of each wave. The higher the number of bits the more accurately the value is stored.
• number of waves used to store the value of each sample. The higher the number of bits the more accurately the value is stored.
• number of bits used to store the value of each sample. The higher the number of bits the more accurately the value is stored.

### Question 18

Question
An instruction set is the group of instructions available for that specific processor to use. The number of instructions available will depend on...
• the number of bits used.
• the number of instructions used.
• the speed of the processor.

### Question 19

Question
The CPU fetches instructions and decodes them in order to find out what to do next. The instructions are in two parts: the OPERATOR and the OPERAND. The OPERATOR or OPCODE represents...
• an operation e.g. 'ADD' or 'SUB' or 'DIV'
• a maths operator only e.g. 'ADD.'
• further instructions for the CPU.

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