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Worksheets1. Data Representation - Computer Science CIE IGCSE 2023-24
Total questions: 49
Worksheet time: 30mins
What form of data do computers use?
Hexadecimal
Denary
Binary
ASCII
Unicode
Data is processed using...
logic gates
wires
registers
CPU
Data is stored in...
registers
logic gates
the CPU
accumulator
Denary is base...
10
2
1
16
Binary is base...
10
2
1
16
Hexadecimal is base...
10
2
1
16
Why is hexadecimal a beneficial method of data representation?
It is easier for humans to understand than binary.
It is a shorter representation than binary, using 2 symbols for every 8 binary ones.
It is used more widely
It is simpler to understand than denary, as it makes use of letters.
Select the uses of Hex
MAC Addresses
Memory Dump
Memory
Hyper Text Markup Language
Hyper Text Transfer Protocol
Select the uses of Hex
Assembly code
ASCII Code
Machine Code
Pseudocode
Unicode
Select the uses of Hex
IP Addresses
Error Codes
Web Addresses
Home Addresses
Media Access control codes
In binary, what does 0 + 0 equal?
0
1
0 carry 1
1 carry 1
In binary, what does 1 + 0 equal?
0
1
0 carry 1
1 carry 1
In binary, what does 1 + 1 equal?
0
1
0 carry 1
1 carry 1
In binary, what does 1 + 1 + 1 equal?
0
1
0 carry 1
1 carry 1
What happens if the sum of 2 binary values is greater than 255 in an 8-bit register?
Overflow error
Error code
Machine error
Carry 1 and convert to 16 bits
What is a left shift equivalent to?
Multiplying by 2
Dividing by 2
What is a right shift equivalent to?
Multiplying by 2
Dividing by 2
What is the MSB equivalent to using two's compliment?
-128
128
What does a standard ASCII code character set consist of?
7-bit codes
8-bit codes
16-bit codes
4-bit codes
9-bit codes
What does an extended ASCII code character set consist of?
7-bit codes
8-bit codes
9-bit codes
16-bit codes
4-bit codes
How does a lowercase letter turn to an uppercase letter with standard ASCII code?
The 6th bit changes from a 1 to a 0
The 6th bit changes from a 0 to a 1
The 8th bit changes from a 1 to a 0
The 8th bit changes from a 0 to a 1
The 7th bit is flipped.
How does a lowercase letter turn to an uppercase letter with standard ASCII code?
The 6th bit changes from a 1 to a 0
The 6th bit changes from a 0 to a 1
The 8th bit changes from a 1 to a 0
The 8th bit changes from a 0 to a 1
The 7th bit is flipped.
What does ASCII stand for?
American Standard Code for Information Interchange
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Argentina Simple Code for Incorrect Information
American Simple Code for Information Exchange
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What is ASCII used to represent?
Letters
Numbers
Some Characters
All Characters
Non-English Alphabets
What is Unicode?
An extension of ASCII
An extension of Unicode
An extension of Assembly Code
An extention of Pseudocode
Are sound waves analogue or digital?
Analogue
Digital
What is measuring the amplitude of a sound wave?
Bitmap
Sampling
Amplituding
Sourcing
Calculating file size
What is the number of samples taken per second?
sample rate
file size
sample resolution
bitmapped graphic
What is the number of bits per sample?
sample rate
file size
sample resolution
bitmapped graphic
What is sample rate measured in?
Hertz
Pascals
metres
seconds
What is normal CD streaming quality?
(a)
Once sound is recorded, can you lower the quality?
Yes
No
Once sound is recorded, can you increase the quality?
Yes
No
What is the number of bits used to represent each colour?
sample rate
image resolution
sample resolution
bitmapped graphic
Colour depth
What is the number of pixels in an image?
sample rate
image resolution
sample resolution
bitmapped graphic
Colour depth
What is 1024 byes?
(a)
What is 1024 kibibyes?
(a)
What is 1024 mebibytes?
(a)
What is 1024 gibibytes?
(a)
What is 1024 tebibytes?
(a)
What is 1024 pebibytes?
(a)
A type of file compression that reduces the file size without permanent loss of data.
lossy
lossless
A type of file compression that reduces the file size by permanently removing data
lossy
lossless
Why do we compress data?
To save storage space
To reduce the time taken to stream a file.
To reduce the time taken to upload/download/ transfer a file.
To help prevent data theft
To ensure a full network bandwidth.
Why do we compress data?
To reduce cost
In order to use up minimal bandwidth.
It is a form of encryption
To ensure network security.
Give examples of Lossy Compression algorithms
MPEG-3 (MP3)
MPEG-4 (MP4)
JPEG
RLE
PNG
Give examples of Lossless Compression algorithms
MPEG-3 (MP3)
MPEG-4 (MP4)
JPEG
RLE
PNG
What does RLE stand for?
Run-Length Encoding
Real Lighting exercise
Read Lossless Encryption
Real-Length Encryption
What does JPEG stand for?
Joint Photographic Experts Group
Joint Photographic Encoding Group
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