Data Representation questions

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Data Representation question collection

Review Data Representation questions for Computer Science, with correct answers shown and coverage across binary and denary conversion; hexadecimal; character encoding.

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Question 1

What is the smallest unit of data?
  1. Bit
  2. Byte
  3. Nibble
  4. Kilobyte

Question 2

How many bits are in one byte?
  1. 8
  2. 4
  3. 16
  4. 10

Question 3

How many bits are in one nibble?
  1. 4
  2. 2
  3. 8
  4. 16

Question 4

What base is binary?
  1. 2
  2. 8
  3. 10
  4. 16

Question 5

Which digits are used in binary?
  1. 0 and 1
  2. 0 to 9
  3. A to F
  4. 1 to 8

Question 6

What is denary 5 in binary?
  1. 101
  2. 111
  3. 100
  4. 110

Question 7

What is binary 1001 in denary?
  1. 9
  2. 8
  3. 10
  4. 11

Question 8

What is ASCII mainly used to represent?
  1. Text characters
  2. Audio levels
  3. Pixel colours
  4. Program speed

Question 9

Why is Unicode used instead of ASCII?
  1. It supports far more characters
  2. It always makes files smaller
  3. It works only for English
  4. It stores images only

Question 10

What is \(1\,\mathrm{KB}\) in bytes?
  1. \(1000\,\mathrm{bytes}\)
  2. \(100\,\mathrm{bytes}\)
  3. \(8\,\mathrm{bytes}\)
  4. \(2000\,\mathrm{bytes}\)

Question 11

What is \(1\,\mathrm{MB}\) in \(\mathrm{KB}\)?
  1. \(1000\,\mathrm{KB}\)
  2. \(100\,\mathrm{KB}\)
  3. \(1000000\,\mathrm{KB}\)
  4. \(1\,\mathrm{KB}\)

Question 12

A pixel is part of what?
  1. Digital image
  2. Sound file
  3. CPU
  4. Network packet

Question 13

What does higher image resolution usually mean?
  1. More detail
  2. Less detail
  3. No change in detail
  4. Only black and white

Question 14

What does colour depth measure?
  1. Number of bits per pixel
  2. Image width in pixels
  3. Image load speed
  4. Number of files in a folder

Question 15

What does lossy compression usually give?
  1. Smaller files with some quality loss
  2. Smaller files with no data loss
  3. Larger files with better quality
  4. No change to file size

Question 16

What does lossless compression give?
  1. Smaller files with no data loss
  2. Smaller files with quality loss
  3. Larger files with better quality
  4. No change to file size

Question 17

What is sample rate linked to?
  1. Audio quality
  2. Screen brightness
  3. Battery life
  4. Keyboard response

Question 18

What does higher audio bit rate usually give?
  1. Better quality
  2. Lower quality
  3. No difference
  4. Silent audio

Question 19

What base is hexadecimal?
  1. 16
  2. 2
  3. 8
  4. 10

Question 20

Which letter can appear in hexadecimal?
  1. F
  2. G
  3. Z
  4. Q

Question 21

What is a bit?
  1. A binary digit
  2. A decimal digit
  3. Eight bytes
  4. A text character

Question 22

How many bits are in 1 byte?
  1. 8
  2. 4
  3. 16
  4. 1024

Question 23

What is the largest unsigned value in 8 bits?
  1. 255
  2. 127
  3. 256
  4. 511

Question 24

What is binary 1011 in denary?
  1. 11
  2. 10
  3. 12
  4. 13

Question 25

What is denary 14 in binary?
  1. 1110
  2. 1010
  3. 1100
  4. 1111

Question 26

What base is hexadecimal?
  1. 16
  2. 2
  3. 8
  4. 10

Question 27

Which hex digit comes after 9?
  1. A
  2. B
  3. 10
  4. F

Question 28

What is denary 15 in hexadecimal?
  1. F
  2. E
  3. 10
  4. 1F

Question 29

What is hexadecimal 1A in denary?
  1. 26
  2. 16
  3. 20
  4. 36

Question 30

What is hexadecimal FF in denary?
  1. 255
  2. 225
  3. 240
  4. 511

Question 31

What is ASCII mainly used for?
  1. Text characters
  2. Images
  3. Audio
  4. Video

Question 32

Standard ASCII uses how many bits per character?
  1. 7
  2. 8
  3. 16
  4. 32

Question 33

Why is Unicode used?
  1. To represent many more characters
  2. To compress files
  3. To speed up processors
  4. To encrypt passwords

Question 34

What does lossy compression mean?
  1. Some data is permanently removed
  2. No data is removed
  3. Data is always encrypted
  4. File size always increases

Question 35

What does lossless compression mean?
  1. The original data can be fully restored
  2. Some data is lost forever
  3. Only images can be compressed
  4. The file cannot be edited

Question 36

Image resolution is the number of what?
  1. Pixels in an image
  2. Colours in a palette
  3. Bytes in a file
  4. Frames per second

Question 37

Colour depth is measured in bits per what?
  1. Pixel
  2. Byte
  3. Second
  4. Character

Question 38

What does higher colour depth give?
  1. More possible colours
  2. Fewer possible colours
  3. Lower image quality
  4. Smaller file size always

Question 39

What unit is sample rate measured in?
  1. Hz
  2. Bytes
  3. Pixels
  4. Volts

Question 40

Why compress a file?
  1. To reduce file size
  2. To increase battery life
  3. To change file type
  4. To add metadata

Question 41

What is denary 10 in binary?
  1. 1010
  2. 1001
  3. 1100
  4. 1110

Question 42

What denary value is hexadecimal A?
  1. 10
  2. 8
  3. 12
  4. 16

Question 43

What does a left shift by 1 bit do?
  1. Moves all bits left and inserts 0 on the right
  2. Moves all bits right and inserts 0 on the left
  3. Reverses all bit values
  4. Deletes the most significant bit only

Question 44

What happens when a value is too large for available bits?
  1. Overflow occurs
  2. The value becomes negative automatically
  3. The value is always rounded down
  4. The CPU adds extra bits automatically

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Review Data Representation questions for Computer Science, with correct answers shown and coverage across binary and denary conversion; hexadecimal; character encoding.

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