4.5.6.1 Bit patterns for images, sound and other data Quiz: AQA Computer Science, Unit 5

The 20 questions

1. What determines how a given bit pattern is interpreted by a computer?

   • Clock frequency
   • Bit length
   • Voltage level
   • Software context

2. Why can the same 8-bit binary pattern represent either a number or a character?

   • Bits change dynamically
   • Automatic CPU conversion
   • RAM alters values
   • Context determines interpretation

3. What determines the number of bits used to represent the colour of each bitmap pixel?

   • Sample rate
   • Metadata size
   • Image resolution
   • Colour depth

4. What does each binary sample represent in a digitally recorded sound file?

   • Compression ratio
   • Waveform amplitude
   • Sound frequency
   • Audio pitch

5. Which standard encoding uses 7-bit or 8-bit binary patterns to represent text characters?

   • ASCII
   • MIDI
   • MP3
   • JPEG

6. What do the bit patterns in a machine code instruction represent?

   • Processor operations
   • Memory addresses only
   • Data types
   • Analogue signals

7. How many distinct patterns can an 8-bit byte represent?

   • 128
   • 256
   • 8
   • 64

8. A 4-bit colour depth is used for each pixel. How many colours can each pixel show?

   • 4
   • 256
   • 8
   • 16

9. A pixel's 24-bit RGB pattern is FF 00 00 in hexadecimal. What colour is shown?

   • Red
   • Black
   • Blue
   • Green

10. A pixel's 24-bit RGB pattern is 00 FF 00 in hexadecimal. What colour is shown?

    • Green
    • White
    • Red
    • Blue

11. The byte 01000001 is read as an unsigned integer and as an ASCII character. Which pair is correct?

    • 66 and 'B'
    • 97 and 'a'
    • 67 and 'C'
    • 65 and 'A'

12. The byte pattern 0101 1010 is read as a hexadecimal value. What is it?

    • 50
    • 5B
    • 5A
    • A5

13. A 1-bit image has pixels with bits 1, 0, 1, 1, where 1 is black. How many pixels are black?

    • 1
    • 3
    • 2
    • 4

14. A 16-bit sound sample can take how many distinct amplitude levels?

    • 256
    • 32,768
    • 65,536
    • 16

15. A single byte 11111111 is read as a grey-scale intensity from 0 (black) to 255 (white). What is shown?

    • An invalid value
    • White
    • Mid grey, at 128
    • Black

16. Convert the decimal number 1000 to a 16-bit unsigned bit pattern.

    • 0000 0100 0000 0000
    • 0000 0011 1110 1000
    • 0000 1111 1110 1000
    • 0000 0011 1110 0100

17. What determines how a binary bit pattern is interpreted by a computer?

    • Clock speed
    • Data type
    • Bus width
    • Storage capacity

18. A byte 10000000 is read as a signed two's complement value and as an unsigned value. Which pair is correct?

    • -128 signed and 128 unsigned
    • -1 signed and 255 unsigned
    • 128 signed and -128 unsigned
    • 0 signed and 128 unsigned

19. What determines whether a file's bit pattern represents text, image, or sound data?

    • Processor clock speed
    • Software interpretation
    • Hardware architecture
    • Bus width

20. What lookup structure maps pixel index values to actual colour values in indexed images?

    • Symbol table
    • Palette table
    • ADC converter
    • Huffman tree

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