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WorksheetsY10 - Data 3.3
Total questions: 55
Worksheet time: 28mins
Which number base does a computer use to represent all data and instructions?
Decimal
Octal
Hexadecimal
Binary
Why is hexadecimal often used in computing?
It is more accurate than binary
It is shorter and easier for humans to read than binary
It is easier to calculate with
It stores more data in memory
What is the base of the hexadecimal number system?
Base 12
Base 16
Base 10
Base 8
What is the binary value of the decimal number 13?
1101
1110
1001
1011
What is the decimal equivalent of binary 101011?
55
45
53
43
What is the hexadecimal value of the decimal number 255?
FE
FF
Which of the following is the correct conversion of binary 11110000 to hexadecimal?
F0
FF
A0
0F
Convert hexadecimal 3C to decimal.
60
56
42
75
What is the binary equivalent of hexadecimal A9?
11001011
10011010
10101001
11100100
Which of these decimal numbers can be represented with 8 bits?
512
255
260
300
How many bits are in a byte?
2
16
4
8
Which hexadecimal value matches the binary nibble 1111?
E
F
A
C
Choose the correct pair: 1 byte equals how many bits?
12 bits
2 bits
8 bits
4 bits
Which prefix represents one billion bytes?
Nano
Tera
Giga
Mega
Which of these is the smallest unit of data?
Bit
Word
Byte
Nibble
What is 1011 + 1100 in binary?
10000
10111
11000
11111
What happens when a binary number is shifted left by 1 place?
It is multiplied by 4
It is multiplied by 2
It stays the same
It is divided by 2
What is the result of shifting 00110110 right by 2 places?
11011000
00001101
10011000
00001110
Binary shifts are commonly used for:
Compressing large files
Converting text to ASCII codes
Multiplying or dividing by powers of 2
Sorting data quickly
How many bits are used in standard ASCII?
5 bits total
8 bits total
6 bits total
7 bits total
What is the main advantage of Unicode over ASCII?
It uses fewer bits overall
It is faster to process by computers
It uses binary instead of hexadecimal
It supports more characters and languages
In ASCII, if 'A' = 65, what is 'C'?
66 as code
67 as code
68 as code
69 as code
Which character set uses the same codes as ASCII up to 127?
Binary numbers
UTF-16 encoding
Unicode standard
Extended ASCII set
What is a pixel?
A type of character code
A file compression method
A tiny square of an image
A screen color palette
A pixel is best described as:
A file format for pictures
A single point in an image
A compression method used
A type of display colour
What does colour depth represent in a digital image?
Number of pixels in total
Number of colours per pixel
Height measured in pixels
Width measured in pixels
Increasing colour depth will primarily:
Reduce pixels required overall
Reduce image quality noticeably
Increase file size overall
Make the image grayscale only
Which equation correctly calculates bitmap size in bits?
Width × Height × Depth
Width × Depth ÷ Height
Width + Height + Depth
Width² + Height²
What happens to file size when image resolution increases?
It becomes automatically compressed
It decreases over time
It stays exactly the same
It increases accordingly
If the colour depth doubles from 4 bits to 8 bits, what happens to the number of possible colours per pixel?
It stays unchanged
It doubles in count
It halves in count
It becomes unlimited
An image has resolution 50×30 pixels and colour depth 2 bits. What is its size in bits?
4,000
2,000
1,000
3,000
Two images have the same resolution. One uses 8-bit colour, the other uses 4-bit colour. Which file is larger and why?
8-bit, more colours per pixel
4-bit, fewer pixels overall
8-bit, higher pixel width
4-bit, stronger compression used
A student wants to reduce an image’s file size without changing its dimensions. Which change is most effective?
Increase image resolution
Increase colour depth
Reduce colour depth
Add more pixels vertically
What is sample resolution in digital audio?
Volume level of the sound
Number of samples per second
Number of bits per sample
Length of the sound track
Which unit is typically used to measure sampling rate?
Bits
Bytes
Hertz
Decibels
Increasing the sampling rate will most likely do what to a sound file?
Lower overall sound quality
Reduce total file size
Convert sound to analogue
Increase total file size
A recording has sample rate 10,000 Hz, resolution 8 bits, and duration 5 seconds. What is the file size in bits?
40,000
50,000
400,000
500,000
What is the main purpose of data compression?
To reduce file size
To encrypt all data
To improve image quality
To delete extra files
Which compression technique uses a tree structure to assign shorter codes to frequent characters?
Run-length encoding
Hexadecimal encoding
Huffman coding
ASCII coding
If two audio files have the same duration and resolution but different sampling rates, which will likely be larger in size?
The higher sampling rate file
Size depends only on volume level
Both will be identical size
The lower sampling rate file
Which statement best describes run-length encoding?
Stores frequent symbols with shorter codes
Converts binary to hexadecimal digits
Encrypts data using secret keys
Represents repeated data as value plus count
Why does higher sample resolution improve sound quality?
It converts analogue waves to digital
It records each sample with more detail
It captures louder volume levels
It increases samples per second
Which change would reduce an audio file’s size without changing duration?
Raise the playback volume
Add more channels to stereo
Increase the sample resolution
Lower the sampling rate
In Huffman coding, characters that occur more often are assigned:
Shorter codes
8-bit codes
Longer codes
No code at all
Run-length encoding works best on:
Sound recordings
Text documents
Files with repeated data
Database tables
Which of the following is an RLE encoding of 0000111100?
6 0 4 1
2 0 4 1 4 0
4 0 2 1 4 0
4 0 4 1 2 0
Which of the following is a benefit of lossless compression?
Better sound quality
Converts binary to text
No data is lost
Smaller files than lossy
What binary value represents black in a 1-bit image?
0
1
00
10
Which of the following increases both bitmap resolution and storage size?
Reducing pixel density
Lowering compression ratio
Decreasing image dimensions
Increasing color depth
What is the hexadecimal equivalent of binary 0110 1111?
F6
5C
6F
A2
What is the binary for decimal 200?
11110000
11011000
10101010
11001000
Which character encoding allows representation of emojis?
Hexadecimal
Binary
Unicode
ASCII
What is the file size (bytes) of a bitmap with 256 pixels and colour depth of 8 bits?
128 B
64 B
256 B
512 B
A sample resolution of 16 bits means:
Each sample uses 16 bits
16 samples are taken each second
Each file is 16 MB
16 bytes are stored per minute
Which compression method groups repeated values?
Huffman coding
Unicode
ASCII
Run-length encoding
